CN109115506B - Use method of air inlet system of engine test bed - Google Patents
Use method of air inlet system of engine test bed Download PDFInfo
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- CN109115506B CN109115506B CN201811164304.6A CN201811164304A CN109115506B CN 109115506 B CN109115506 B CN 109115506B CN 201811164304 A CN201811164304 A CN 201811164304A CN 109115506 B CN109115506 B CN 109115506B
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Abstract
A use method of an air inlet system of an engine test bed comprises the following steps: s100), adjusting total intake pressure and oxygen content of the engine; s200), adjusting the total temperature of air inlet of the engine; s300), adjusting total intake pressure of the engine; s400), igniting the engine; s500), simulating test of the Nth simulation state point; s600) and repeating the step S500 until all the simulation state point tests are finished, stopping the engine, closing the fuel supply flow regulating valve, the oxygen supply flow regulating valve, the air inlet supply pressure regulating valve and the alcohol supply flow regulating valve of the engine. The use method of the air inlet system of the engine test bed has the advantages of being high in adjusting speed, saving adjusting time of air inlet simulation of the engine of the test bed, reducing test cost and avoiding energy waste.
Description
Technical Field
The invention relates to the technical field of test measurement, in particular to a using method of an air inlet system of an engine test bed.
Background
Before the test flight of the aircraft engine, a high-altitude simulation test needs to be carried out on the ground, when the engine test is carried out, a group of air inlet parameters including total air inlet pressure, air inlet flow rate, air inlet oxygen content, total air inlet temperature and oil supply quantity of the engine are required, namely air inlet state points, and after a set value and a set value are reached, the performance and the parameters are recorded or the performance is checked.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, and the using method of the air inlet system of the engine test bed is provided.
The technical solution of the invention is as follows: the use method of the air inlet system of the engine test bed comprises a supply source, a temperature simulation unit and a simulation cabin; the supply sources comprise a fuel supply source, an oxygen supply source, an engine air inlet supply source and an alcohol supply source; the temperature simulation unit comprises a pipe body and a shell, the pipe body is positioned in the shell, a first medium channel is arranged in the pipe body, and a second medium channel is formed in a space between the outer wall of the pipe body and the inner wall of the shell; the tested engine is positioned in the simulation cabin; the fuel supply source is communicated with a tested engine through a pipeline, the oxygen supply source and the engine air inlet supply source are respectively communicated with an inlet of a second medium channel through a pipeline, an outlet of the second medium channel is communicated with an air inlet of the tested engine through a pipeline, and the alcohol supply source is communicated with an inlet of a first medium channel through a pipeline after passing through an igniter; an engine fuel supply flow regulating valve is arranged on a pipeline for communicating the fuel supply source with the tested engine, an oxygen supply flow regulating valve is arranged on a pipeline for communicating the oxygen supply source with the inlet of the second medium channel, an engine intake supply pressure regulating valve is arranged on a pipeline for communicating the engine intake supply source with the inlet of the second medium channel, an alcohol supply flow regulating valve is arranged on a pipeline for communicating the alcohol supply source with the inlet of the first medium channel, and the outlet of the first medium channel is communicated with the outside;
the use method of the air inlet system of the engine test bed comprises the following steps:
s100), total intake pressure and oxygen content adjustment of engine
Adjusting an engine intake air supply pressure adjusting valve and an oxygen supply flow adjusting valve according to the intake total pressure and the oxygen content of the first simulation state point, so that the total pressure and the oxygen content of the second medium passing through the outlet of the second medium channel are the same as the intake total pressure and the oxygen content of the engine of the first simulation state point;
s200) adjusting total temperature of air inlet of engine
Adjusting an alcohol supply flow regulating valve according to the total intake temperature of the first simulation state point, starting an igniter, igniting alcohol to combust the alcohol, exchanging heat between the combusted alcohol and a second medium of a second medium channel in a first medium channel, and enabling the total temperature of the second medium passing through an outlet of the second medium channel to be the same as the total intake temperature of the engine in the first simulation state point;
s300), total pressure adjustment of air inlet of engine
Adjusting an engine intake air supply pressure adjusting valve according to the intake total pressure of the first simulation state point, so that the total pressure of the second medium passing through the outlet of the second medium channel is the same as the intake total pressure of the engine at the first simulation state point;
s400), igniting the engine
Adjusting a fuel supply flow regulating valve of the engine according to the fuel demand of the first simulation state point of the engine, so that the fuel supplied by a fuel supply source is the same as the fuel demand of the first simulation state point of the engine, igniting the engine, and carrying out an air intake simulation test of the first simulation state point until the air intake simulation test of the state point is finished;
s500), simulation test of Nth simulation state point
Respectively adjusting and regulating an oxygen supply flow regulating valve, an engine air inlet supply pressure regulating valve, an alcohol supply flow regulating valve and an engine fuel supply flow regulating valve to ensure that the total pressure, the total temperature and the oxygen content of a second medium at the outlet of a second medium channel are the same as the total pressure, the total temperature and the oxygen content of inlet air of the engine in the Nth simulation state point, and the fuel supplied by a fuel supply source is the same as the fuel demand of the engine in the Nth simulation state point; wherein N is more than or equal to 2; starting an air inlet simulation test of an Nth state point of the engine until the air inlet simulation test of the state point is finished;
s600) and repeating the step S500 until all the simulation state point tests are finished, stopping the engine, closing the fuel supply flow regulating valve, the oxygen supply flow regulating valve, the air inlet supply pressure regulating valve and the alcohol supply flow regulating valve of the engine.
Furthermore, the engine test bed comprises an engine fuel supply stop valve, an oxygen supply stop valve and an alcohol supply stop valve, wherein in the use process of the engine test bed, the engine fuel supply stop valve is opened before the engine fuel supply flow regulating valve is opened, the oxygen supply stop valve is opened before the oxygen supply flow regulating valve is opened, and the alcohol supply stop valve is opened before the alcohol supply flow regulating valve is opened; the engine fuel supply shutoff valve is closed after the engine fuel supply flow control valve is closed, the oxygen supply shutoff valve is closed after the oxygen supply flow control valve is closed, and the alcohol supply shutoff valve is closed after the alcohol supply flow control valve is closed.
Further, in step S200, adjusting an alcohol supply flow rate adjusting valve according to the total intake air temperature at the first simulation state point, starting an igniter, igniting alcohol to combust the alcohol, exchanging heat between the combusted alcohol and a second medium in a first medium passage and a second medium in a second medium passage, and making the total temperature of the second medium passing through an outlet of the second medium passage the same as the total intake air temperature of the engine at the first simulation state point;
s210), adjusting an alcohol supply flow regulating valve according to the highest working condition value which can be borne by the temperature simulation unit, starting an igniter, igniting alcohol to burn the alcohol, and exchanging heat between the burned alcohol and a second medium in the first medium channel and the second medium channel;
s220), keeping the state of the step S210 until the temperature simulation unit enters a stable working state;
s230), determining the supply temperature of the first medium according to the total temperature of the second medium at the outlet of the second medium channel, the mass of the second medium in the second medium channel, the constant-pressure specific heat of the second medium, the convective heat transfer coefficient of the inner wall of the pipe body, the area of the inner wall of the whole pipe body, the mass of the first medium in the first medium channel, the constant-pressure specific heat of the first medium, the convective heat transfer coefficient of the outer wall of the pipe body, the area of the outer wall of the whole pipe body and the total temperature of the second medium at the inlet of the second medium channel in the first simulation state point;
s240), adjusting an alcohol supply flow regulating valve, and adjusting the first medium state in the first medium channel from the highest working condition value supply which can be borne by the temperature simulation unit to a preset value supply according to a first simulation test state point;
s250) keeping the first medium in the first medium channel to be supplied to the temperature simulation unit according to the preset value of the experimental first simulation test state point to enter a stable working state, wherein the total temperature of the second medium passing through the outlet of the second medium channel is the same as the total temperature of the air intake of the engine in the first simulation state point.
Further, in step S500, the oxygen supply flow rate control valve, the engine intake air supply pressure control valve, the alcohol supply flow rate control valve and the engine fuel supply flow rate control valve are respectively adjusted and adjusted, so that the total pressure, the total temperature and the oxygen content of the second medium at the outlet of the second medium channel are the same as the total intake air pressure, the total temperature and the oxygen content of the engine at the nth simulation state point, and the fuel supply source supplies the fuel with the same fuel demand as the engine at the nth simulation state point; wherein N is more than or equal to 2;
s510) adjusting an oxygen supply flow regulating valve to enable the oxygen content of the second medium at the outlet of the second medium channel to be the same as that of the engine at the Nth simulation state point;
s520), determining the supply temperature of the first medium according to the total temperature of the second medium at the outlet of the second medium channel, the mass of the second medium in the second medium channel, the constant-pressure specific heat of the second medium, the convective heat transfer coefficient of the inner wall of the pipe body, the area of the inner wall of the whole pipe body, the mass of the first medium in the first medium channel, the constant-pressure specific heat of the first medium, the convective heat transfer coefficient of the outer wall of the pipe body, the area of the outer wall of the whole pipe body and the total temperature of the second medium at the inlet of the second medium channel in the Nth simulation state point;
s530), adjusting an alcohol supply flow regulating valve, and regulating the state of the first medium in the first medium channel from the preset value supply of the first simulation test state point to the preset value supply according to the Nth simulation test state point;
s540), keeping the first medium in the first medium channel to be supplied to the temperature simulation unit according to the preset value of the Nth simulation test state point of the experiment to enter a stable working state, wherein the total temperature of the second medium passing through the outlet of the second medium channel is the same as the total temperature of the air intake of the engine at the Nth simulation state point;
s550) adjusting an engine air inlet supply pressure adjusting valve according to the total air inlet pressure of the Nth simulation state point, so that the total pressure of the second medium passing through the outlet of the second medium channel is the same as the total air inlet pressure of the engine of the Nth simulation state point;
and S560), adjusting the fuel supply flow regulating valve of the engine according to the fuel demand of the Nth simulation state point of the engine, so that the fuel supplied by the fuel supply source is the same as the fuel demand of the Nth simulation state point of the engine.
Further, the highest working condition value which can be borne by the temperature simulation unit is the highest pressure, the highest temperature and the highest flow of the first medium which can be borne by the temperature simulation unit; the parameters simulating the predetermined values of the test condition points include the pressure of the medium inlet and outlet, the flow rate of the medium, and the temperature of the medium.
Further, in step S220, the state of step S210 is maintained until the temperature simulation unit enters the stable operation state, and the required time is T1(ii) a Maintaining the second in the first media path in step S250A medium is supplied to the temperature simulation unit according to a preset value of a first simulation test state point of an experiment to enter a stable working state, and the required time is T2(ii) a In step S540, the first medium in the first medium channel is kept in a state of being supplied to the temperature simulation unit according to the predetermined value of the nth simulation test state point of the experiment, and the temperature simulation unit enters a stable working state, and the required time is TN；
T1，T2And TNAll the parameters are determined according to a calculation formula when the temperature simulation unit enters a stable working state; the temperature simulation unit enters a stable working state and has the following calculation formula:
in the formula: t isxThe unit is s, and the time for the temperature simulation unit to enter a stable working state; m is the mass of the whole pipe body, the unit is kg, and the m is a known quantity; c. CmpThe specific heat at constant pressure of the pipe body is given as J/kg.K, which is a known quantity; h ishIs the convective heat transfer coefficient of the inner wall of the tube body and has the unit of W/(m)2K), in known amounts; a. thesiIs the inner wall area of the whole pipe body and has the unit of m2Is a known amount; m ishIs the mass of the first medium in kg, a known quantity, in the first medium channel; c. CphThe specific heat at constant pressure of the first medium is given as J/kg.K, and is a known quantity; h iscIs the convective heat transfer coefficient of the outer wall of the tube body and has the unit of W/(m)2K), in known amounts; a. theseIs the outer wall area of the whole pipe body and has the unit of m2Is a known amount; m iscIs the mass of the second medium in kg, a known quantity, in the second medium channel; c. CpcThe specific heat at constant pressure of the second medium is expressed in J/kg.K and is a known amount.
Further, in step S230, according to the total temperature of the second medium at the outlet of the second medium channel, the mass of the second medium in the second medium channel, the constant pressure specific heat of the second medium, the convective heat transfer coefficient of the inner wall of the tube body, the area of the inner wall of the whole tube body, the mass of the first medium in the first medium channel, and the first simulated state pointThe constant pressure specific heat of the medium, the heat convection coefficient of the outer wall of the pipe body, the outer wall surface of the whole pipe body and the total temperature of the second medium at the inlet of the second medium channel determine the supply temperature of the first medium, and at the moment, the supply temperature of the first medium is Thi1；
In step S520, determining a supply temperature of the first medium according to the total temperature of the second medium at the outlet of the second medium channel, the mass of the second medium in the second medium channel, the constant pressure specific heat of the second medium, the convective heat transfer coefficient of the inner wall of the tube body, the area of the inner wall of the entire tube body, the mass of the first medium in the first medium channel, the constant pressure specific heat of the first medium, the convective heat transfer coefficient of the outer wall of the tube body, the area of the outer wall of the entire tube body, and the total temperature of the second medium at the inlet of the second medium channel at the nth simulation state point, where the supply temperature of the first medium is ThiN；
Thi1And ThiNAll determined according to a heat flow input temperature formula of a temperature simulation unit; the heat flow input temperature formula of the temperature simulation unit is as follows:
in the formula:
Thixis the feed temperature of the first medium in K; t iscoThe total temperature of the second medium at the outlet of the second medium channel is K and is a known quantity; m iscThe mass of the second medium in the second medium channel is kg, and is a known quantity; c. CpcThe specific heat at constant pressure of the second medium is given as J/kg.K, and is a known quantity; h ishIs the convective heat transfer coefficient of the inner wall of the tube body and has the unit of W/(m)2K), in known amounts; a. thesiIs the inner wall area of the whole pipe body and has the unit of m2Is a known amount; m ishIs the mass of the first medium in the first medium channel, the unit is kg, and is a known quantity; c. CphThe specific heat at constant pressure of the first medium is given as J/kg.K, and is a known quantity; h iscIs the convective heat transfer coefficient of the outer wall of the tube body and has the unit of W/(m)2K), in known amounts; a. theseIs the outer wall area of the whole pipe body and has the unit of m2Is aA known amount; t isciThe total temperature of the second medium, in K, which is the inlet of the second medium channel, is a known quantity.
Compared with the prior art, the invention has the advantages that:
1. the use method of the air inlet system of the engine test bed adopts the modes of firstly adjusting the total air inlet pressure and the oxygen content, then adjusting the total air inlet temperature, then finely adjusting the total air inlet pressure, supplying oil and igniting, has high adjusting speed, saves the adjusting time of the air inlet simulation of the engine test bed, reduces the test cost and avoids energy waste.
2. According to the using method of the air inlet system of the engine test bed, the air inlet flow and the air inlet total pressure of the engine are simulated through the air inlet supply source of the engine, meanwhile, oxygen is supplemented for the air inlet of the engine through the oxygen supply source, the air inlet temperature of the engine is simulated through the temperature simulation unit, the real simulation of the air inlet of the engine is achieved, and the simulation precision is high.
3. According to the using method of the air inlet system of the engine test bed, the alcohol supply source is arranged, alcohol is ignited by the igniter to generate heat, and the heat exchanges heat with the air inlet of the engine in the temperature simulation unit, so that the adjustment of the air inlet temperature of the engine is realized.
4. The use method of the air inlet system of the engine test bed realizes the adjustability of the flow and the pressure of the related supply source by arranging various valves, thereby realizing the simulation of multiple state points.
5. According to the use method of the air inlet system of the engine test bed, in the use process of the temperature simulation unit, when the temperature simulation unit is creatively started, the highest working condition value which can be borne by the temperature simulation unit is firstly used for inputting hot air flow to the heat exchanger, so that the inner pipe of the temperature simulation unit works at full load, the inner pipe is heated at the fastest speed, the temperature of the pipe body is increased at a high speed, the temperature distribution is uniform, the full load state is adjusted to be a test preset value, and the time for entering the stable working state is greatly shortened.
6. According to the use method of the air inlet system of the engine test bed, the high-accuracy temperature simulation unit enters the stable working state calculation formula through a large amount of test data and creative curve fitting on the data in the use process of the temperature simulation unit, the time for the temperature simulation unit to enter the stable working state can be accurately determined, the test time is greatly shortened, the test cost is reduced, and energy waste is avoided.
7. According to the use method of the air inlet system of the engine test bed, in the use process of the temperature simulation unit, the high-accuracy heat flow input calculation formula of the temperature simulation unit is determined through a large amount of test data and creative curve fitting on the data, the heat flow input temperature of the temperature simulation unit can be accurately determined, the test time is greatly shortened, the test cost is reduced, and energy waste is avoided.
Drawings
FIG. 1 is a flow chart of a method of using the engine test bed air induction system of the present invention.
Fig. 2 is a schematic diagram of an engine test bed related to a using method of the air inlet system of the engine test bed.
Fig. 3 is a schematic partial structural diagram of a temperature simulation unit in an engine test bed and a method for using the engine test bed air intake system of the present invention.
Detailed Description
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "abutted" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The use method of the air inlet system of the engine test bed is used for an air inlet simulation test of an engine at a high altitude multi-state point, and air inlet parameters of the state point comprise total air inlet pressure, air inlet flow, oxygen inlet components, total air inlet temperature and oil supply quantity of the engine.
The engine test bed air inlet system comprises a supply source, a temperature simulation unit 200 and a simulation cabin 300.
The supply sources include a fuel supply source 110, an oxygen supply source 120, an engine intake supply source 130, and an alcohol supply source 140; the temperature simulation unit comprises a pipe body 210 and a shell 220, wherein the pipe body 210 is positioned inside the shell 220, a first medium channel is arranged inside the pipe body 210, and a second medium channel is formed in a space between the outer wall of the pipe body 210 and the inner wall of the shell 220; when the temperature simulation unit 200 works, a first medium circulates in the first medium channel, a second medium circulates in the second medium channel, the temperature of the first medium is higher than that of the second medium, and the first medium and the second medium realize heat exchange through the pipe wall of the pipe body 210.
The engine 400 under test is located within the simulation cabin 300.
The fuel supply source 110 is communicated with the tested engine 400 through a pipeline, the oxygen supply source 120 and the engine intake air supply source 130 are respectively communicated with an inlet of a second medium channel through pipelines, and an outlet of the second medium channel is communicated with an air inlet of the tested engine 400 through a pipeline, so that simulated engine intake air flow, total intake air pressure and oxygen content are provided for the tested engine 400; the alcohol supply source 140 is communicated with the inlet of the first medium channel through a pipeline after passing through the igniter, the outlet of the first medium channel is communicated with the outside, the igniter ignites alcohol to burn to generate heat, and the heat is exchanged with the second medium in the second medium channel in the temperature simulation unit 200 to adjust the temperature of the second medium in the second medium channel, so that the intake temperature simulation of the engine is realized.
An engine fuel supply flow regulating valve 510 is arranged on a pipeline for communicating the fuel supply source 110 with the tested engine 400, an oxygen supply flow regulating valve 530 is arranged on a pipeline for communicating the oxygen supply source 120 with the inlet of the second medium channel, an engine intake air supply pressure regulating valve 550 is arranged on a pipeline for communicating the engine intake air supply source 130 with the inlet of the second medium channel, and an alcohol supply flow regulating valve 560 is arranged on a pipeline for communicating the alcohol supply source 140 with the inlet of the first medium channel, so that parameter regulation of each supply source is realized, and multi-state point simulation is met.
The use method of the air inlet system of the engine test bed comprises the following steps:
s100), total intake pressure and oxygen content adjustment of engine
And adjusting an engine intake air supply pressure adjusting valve and an oxygen supply flow adjusting valve according to the intake air total pressure and the oxygen content of the first simulation state point, so that the total pressure and the oxygen content of the second medium passing through the outlet of the second medium channel are the same as the intake air total pressure and the oxygen content of the engine of the first simulation state point.
S200) adjusting total temperature of air inlet of engine
Adjusting an alcohol supply flow regulating valve according to the total intake temperature of the first simulation state point, starting an igniter, igniting alcohol to combust the alcohol, exchanging heat between the combusted alcohol and a second medium of a second medium channel in a first medium channel, and enabling the total temperature of the second medium passing through an outlet of the second medium channel to be the same as the total intake temperature of the engine in the first simulation state point;
s210), adjusting an alcohol supply flow regulating valve according to the highest working condition value which can be borne by the temperature simulation unit, starting an igniter, igniting alcohol to burn the alcohol, and exchanging heat between the burned alcohol and a second medium in the first medium channel and the second medium channel;
s220), keeping the state of the step S310 until the temperature simulation unit enters a stable working state;
s230), determining the supply temperature of the first medium according to the total temperature of the second medium at the outlet of the second medium channel, the mass of the second medium in the second medium channel, the constant-pressure specific heat of the second medium, the convective heat transfer coefficient of the inner wall of the pipe body, the area of the inner wall of the whole pipe body, the mass of the first medium in the first medium channel, the constant-pressure specific heat of the first medium, the convective heat transfer coefficient of the outer wall of the pipe body, the area of the outer wall of the whole pipe body and the total temperature of the second medium at the inlet of the second medium channel in the first simulation state point;
s240), adjusting an alcohol supply flow regulating valve, and adjusting the first medium state in the first medium channel from the highest working condition value supply which can be borne by the temperature simulation unit to a preset value supply according to a first simulation test state point;
s250) keeping the first medium in the first medium channel to be supplied to the temperature simulation unit according to the preset value of the experimental first simulation test state point to enter a stable working state, wherein the total temperature of the second medium passing through the outlet of the second medium channel is the same as the total temperature of the air intake of the engine in the first simulation state point.
S300), total pressure adjustment of air inlet of engine
And adjusting the engine intake air supply pressure adjusting valve according to the intake total pressure of the first simulation state point, so that the total pressure of the second medium passing through the outlet of the second medium channel is the same as the intake total pressure of the engine at the first simulation state point.
S400), igniting the engine
And adjusting the fuel supply flow regulating valve of the engine according to the fuel demand of the first simulation state point of the engine, so that the fuel supplied by the fuel supply source is the same as the fuel demand of the first simulation state point of the engine, igniting the engine, and carrying out an air inlet simulation test of the first simulation state point until the air inlet simulation test of the state point is finished.
S500), simulation test of Nth simulation state point
Respectively adjusting an oxygen supply flow regulating valve, an engine air inlet supply pressure regulating valve, an alcohol supply flow regulating valve and an engine fuel supply flow regulating valve to ensure that the total pressure, the total temperature and the oxygen content of a second medium at the outlet of a second medium channel are the same as the total pressure, the total temperature and the oxygen content of inlet air of the engine at the Nth simulation state point, and the fuel supplied by a fuel supply source is the same as the fuel demand of the engine at the Nth simulation state point; and N is more than or equal to 2, starting the air inlet simulation test of the Nth state point of the engine until the air inlet simulation test of the state point is finished.
S510) adjusting an oxygen supply flow regulating valve to enable the oxygen content of the second medium at the outlet of the second medium channel to be the same as that of the engine at the Nth simulation state point;
s520), determining the supply temperature of the first medium according to the total temperature of the second medium at the outlet of the second medium channel, the mass of the second medium in the second medium channel, the constant-pressure specific heat of the second medium, the convective heat transfer coefficient of the inner wall of the pipe body, the area of the inner wall of the whole pipe body, the mass of the first medium in the first medium channel, the constant-pressure specific heat of the first medium, the convective heat transfer coefficient of the outer wall of the pipe body, the area of the outer wall of the whole pipe body and the total temperature of the second medium at the inlet of the second medium channel in the Nth simulation state point;
s530), adjusting an alcohol supply flow regulating valve, and regulating the state of the first medium in the first medium channel from the preset value supply of the first simulation test state point to the preset value supply according to the Nth simulation test state point;
s540), keeping the first medium in the first medium channel to be supplied to the temperature simulation unit according to the preset value of the Nth simulation test state point of the experiment to enter a stable working state, wherein the total temperature of the second medium passing through the outlet of the second medium channel is the same as the total temperature of the air intake of the engine at the Nth simulation state point;
s550) adjusting an engine air inlet supply pressure adjusting valve according to the total air inlet pressure of the Nth simulation state point, so that the total pressure of the second medium passing through the outlet of the second medium channel is the same as the total air inlet pressure of the engine of the Nth simulation state point;
s560), adjusting the fuel supply flow regulating valve of the engine according to the fuel demand of the Nth simulation state point of the engine, enabling the fuel supplied by the fuel supply source to be the same as the fuel demand of the Nth simulation state point of the engine, and starting the air inlet simulation test of the Nth state point of the engine until the air inlet simulation test of the state point is finished.
S600) and repeating the step S500 until all the simulation state point tests are finished, stopping the engine, closing the fuel supply flow regulating valve, the oxygen supply flow regulating valve, the air inlet supply pressure regulating valve and the alcohol supply flow regulating valve of the engine.
Preferably, the highest working condition value that the temperature simulation unit can bear is the highest pressure, the highest temperature and the highest flow of the first medium that the temperature simulation unit can bear; the parameters simulating the predetermined values of the test condition points include the pressure of the medium inlet and outlet, the flow rate of the medium, and the temperature of the medium.
Preferably, the engine test stand includes an engine fuel supply cutoff valve 520, an oxygen supply cutoff valve 540, and an alcohol supply cutoff valve 570, and the engine fuel supply cutoff valve 520 is provided on a pipeline that communicates the fuel supply source 110 with the engine under test 400; the oxygen supply shutoff valve 540 is provided on a line communicating the oxygen supply source 120 with the inlet of the second medium passage; the alcohol supply shut-off valve 570 is provided in a line that communicates the alcohol supply source 140 with the inlet of the first medium passage. During the use of the engine test bed, the engine fuel supply cutoff valve 520 is opened before the engine fuel supply flow rate regulating valve 510 is opened, the oxygen supply cutoff valve 540 is opened before the oxygen supply flow rate regulating valve 530 is opened, and the alcohol supply cutoff valve 570 is opened before the alcohol supply flow rate regulating valve 560 is opened; the engine fuel supply shutoff valve 520 is closed after the engine fuel supply flow rate adjustment valve 510 is closed, the oxygen supply shutoff valve 540 is closed after the oxygen supply flow rate adjustment valve 530 is closed, and the alcohol supply shutoff valve 570 is closed after the alcohol supply flow rate adjustment valve 560 is closed, so that the safety of the test bed in a non-experimental state is ensured.
Preferably, in step S220, the state of step S210 is maintained until the temperature simulation unit enters the stable operation state, and the required time is T1(ii) a In step S250, the first medium in the first medium channel is kept in a supply state according to the predetermined value of the experimental first simulation test state point until the temperature simulation unit enters a stable working state, and the required time is T2(ii) a In step S540, the first medium in the first medium channel is kept in a state of being supplied to the temperature simulation unit according to the predetermined value of the nth simulation test state point of the experiment, and the temperature simulation unit enters a stable working state, and the required time is TN；
T1，T2And TNAll the parameters are determined according to a calculation formula when the temperature simulation unit enters a stable working state; the temperature simulation unit enters a stable working state and has the following calculation formula:
in the formula: t isxThe unit is s, and the time for the temperature simulation unit to enter a stable working state; m is the mass of the whole pipe body, the unit is kg, and the m is a known quantity; c. CmpThe specific heat at constant pressure of the pipe body is given as J/kg.K, which is a known quantity; h ishIs the convective heat transfer coefficient of the inner wall of the tube body and has the unit of W/(m)2K), in known amounts; a. thesiIs the inner wall area of the whole pipe body and has the unit of m2Is a known amount; m ishIs the mass of the first medium in kg, a known quantity, in the first medium channel; c. CphThe specific heat at constant pressure of the first medium is given as J/kg.K, and is a known quantity; h iscIs the convective heat transfer coefficient of the outer wall of the tube body and has the unit of W/(m)2K), in known amounts; a. theseIs the outer wall area of the whole pipe body and has the unit of m2Is a known amount; m iscIs the mass of the second medium in kg, a known quantity, in the second medium channel; c. CpcThe specific heat at constant pressure of the second medium is expressed in J/kg.K and is a known amount.
Preferably, step S230 is based on the second medium in the first simulation state pointThe total temperature of the second medium at the outlet of the channel, the mass of the second medium in the second medium channel, the constant-pressure specific heat of the second medium, the convective heat transfer coefficient of the inner wall of the tube body, the area of the inner wall of the whole tube body, the mass of the first medium in the first medium channel, the constant-pressure specific heat of the first medium, the convective heat transfer coefficient of the outer wall of the tube body, the area of the outer wall of the whole tube body and the total temperature of the second medium at the inlet of the second medium channel determine the supply temperature of the first medium, and at the moment, the supply temperature of the first medium is Thi1；
In step S520, determining a supply temperature of the first medium according to the total temperature of the second medium at the outlet of the second medium channel, the mass of the second medium in the second medium channel, the constant pressure specific heat of the second medium, the convective heat transfer coefficient of the inner wall of the tube body, the area of the inner wall of the entire tube body, the mass of the first medium in the first medium channel, the constant pressure specific heat of the first medium, the convective heat transfer coefficient of the outer wall of the tube body, the area of the outer wall of the entire tube body, and the total temperature of the second medium at the inlet of the second medium channel at the nth simulation state point, where the supply temperature of the first medium is ThiN；
Thi1And ThiNAll determined according to a heat flow input temperature formula of a temperature simulation unit; the heat flow input temperature formula of the temperature simulation unit is as follows:
in the formula:
Thixis the feed temperature of the first medium in K; t iscoThe total temperature of the second medium at the outlet of the second medium channel is K and is a known quantity; m iscThe mass of the second medium in the second medium channel is kg, and is a known quantity; c. CpcThe specific heat at constant pressure of the second medium is given as J/kg.K, and is a known quantity; h ishIs the convective heat transfer coefficient of the inner wall of the tube body and has the unit of W/(m)2K), in known amounts; a. thesiIs the inner wall area of the whole pipe body and has the unit of m2Is a known amount; m ishIs the mass of the first medium in the first medium channel, the unit is kg, and is a known quantity; c. CphIs the first mediumThe specific heat at constant pressure of the mass is known as J/kg.K; h iscIs the convective heat transfer coefficient of the outer wall of the tube body and has the unit of W/(m)2K), in known amounts; a. theseIs the outer wall area of the whole pipe body and has the unit of m2Is a known amount; t isciThe total temperature of the second medium, in K, which is the inlet of the second medium channel, is a known quantity.
Preferably, when the engine air inlet simulation test is carried out, the tested engine is under the environment pressure of the flying altitude, the pressure in the simulation cabin can be extracted by adopting air extraction equipment, and preferably, the air extraction equipment is a vacuum tank or an ejector.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (7)
1. The use method of the air inlet system of the engine test bed comprises a supply source, a temperature simulation unit and a simulation cabin; it is characterized in that the preparation method is characterized in that,
the supply sources comprise a fuel supply source, an oxygen supply source, an engine air inlet supply source and an alcohol supply source;
the temperature simulation unit comprises a pipe body and a shell, the pipe body is positioned in the shell, a first medium channel is arranged in the pipe body, and a second medium channel is formed in a space between the outer wall of the pipe body and the inner wall of the shell;
the tested engine is positioned in the simulation cabin;
the fuel supply source is communicated with a tested engine through a pipeline, the oxygen supply source and the engine air inlet supply source are respectively communicated with an inlet of a second medium channel through a pipeline, an outlet of the second medium channel is communicated with an air inlet of the tested engine through a pipeline, and the alcohol supply source is communicated with an inlet of a first medium channel through a pipeline after passing through an igniter;
an engine fuel supply flow regulating valve is arranged on a pipeline for communicating the fuel supply source with the tested engine, an oxygen supply flow regulating valve is arranged on a pipeline for communicating the oxygen supply source with the inlet of the second medium channel, an engine intake supply pressure regulating valve is arranged on a pipeline for communicating the engine intake supply source with the inlet of the second medium channel, an alcohol supply flow regulating valve is arranged on a pipeline for communicating the alcohol supply source with the inlet of the first medium channel, and the outlet of the first medium channel is communicated with the outside;
the use method of the air inlet system of the engine test bed comprises the following steps:
s100), total intake pressure and oxygen content adjustment of engine
Adjusting an engine intake air supply pressure adjusting valve and an oxygen supply flow adjusting valve according to the intake total pressure and the oxygen content of the first simulation state point, so that the total pressure and the oxygen content of the second medium passing through the outlet of the second medium channel are the same as the intake total pressure and the oxygen content of the engine of the first simulation state point;
s200) adjusting total temperature of air inlet of engine
Adjusting an alcohol supply flow regulating valve according to the total intake temperature of the first simulation state point, starting an igniter, igniting alcohol to combust the alcohol, exchanging heat between the combusted alcohol and a second medium of a second medium channel in a first medium channel, and enabling the total temperature of the second medium passing through an outlet of the second medium channel to be the same as the total intake temperature of the engine in the first simulation state point;
s300), total pressure adjustment of air inlet of engine
Adjusting an engine intake air supply pressure adjusting valve according to the intake total pressure of the first simulation state point, so that the total pressure of the second medium passing through the outlet of the second medium channel is the same as the intake total pressure of the engine at the first simulation state point;
s400), igniting the engine
Adjusting a fuel supply flow regulating valve of the engine according to the fuel demand of the first simulation state point of the engine, so that the fuel supplied by a fuel supply source is the same as the fuel demand of the first simulation state point of the engine, igniting the engine, and carrying out an air intake simulation test of the first simulation state point until the air intake simulation test of the state point is finished;
s500), simulation test of Nth simulation state point
Respectively adjusting and regulating an oxygen supply flow regulating valve, an engine air inlet supply pressure regulating valve, an alcohol supply flow regulating valve and an engine fuel supply flow regulating valve to ensure that the total pressure, the total temperature and the oxygen content of a second medium at the outlet of a second medium channel are the same as the total pressure, the total temperature and the oxygen content of inlet air of the engine in the Nth simulation state point, and the fuel supplied by a fuel supply source is the same as the fuel demand of the engine in the Nth simulation state point; wherein N is more than or equal to 2; starting an air inlet simulation test of an Nth state point of the engine until the air inlet simulation test of the state point is finished;
s600) and repeating the step S500 until all the simulation state point tests are finished, stopping the engine, closing the fuel supply flow regulating valve, the oxygen supply flow regulating valve, the air inlet supply pressure regulating valve and the alcohol supply flow regulating valve of the engine.
2. The method of claim 1, wherein: the engine test bed comprises an engine fuel supply stop valve, an oxygen supply stop valve and an alcohol supply stop valve, wherein in the use process of the engine test bed, the engine fuel supply stop valve is opened before the engine fuel supply flow regulating valve is opened, the oxygen supply stop valve is opened before the oxygen supply flow regulating valve is opened, and the alcohol supply stop valve is opened before the alcohol supply flow regulating valve is opened; the engine fuel supply shutoff valve is closed after the engine fuel supply flow control valve is closed, the oxygen supply shutoff valve is closed after the oxygen supply flow control valve is closed, and the alcohol supply shutoff valve is closed after the alcohol supply flow control valve is closed.
3. The method of claim 1, wherein:
in the step S200, an alcohol supply flow regulating valve is regulated according to the total intake temperature of the first simulation state point, an igniter is started, alcohol is ignited to combust, the combusted alcohol exchanges heat with a second medium of a second medium channel in a first medium channel, and the total temperature of the second medium passing through an outlet of the second medium channel is the same as the total intake temperature of the engine in the first simulation state point;
s210), adjusting an alcohol supply flow regulating valve according to the highest working condition value which can be borne by the temperature simulation unit, starting an igniter, igniting alcohol to burn the alcohol, and exchanging heat between the burned alcohol and a second medium in the first medium channel and the second medium channel;
s220), keeping the state of the step S210 until the temperature simulation unit enters a stable working state;
s230), determining the supply temperature of the first medium according to the total temperature of the second medium at the outlet of the second medium channel, the mass of the second medium in the second medium channel, the constant-pressure specific heat of the second medium, the convective heat transfer coefficient of the inner wall of the pipe body, the area of the inner wall of the whole pipe body, the mass of the first medium in the first medium channel, the constant-pressure specific heat of the first medium, the convective heat transfer coefficient of the outer wall of the pipe body, the area of the outer wall of the whole pipe body and the total temperature of the second medium at the inlet of the second medium channel in the first simulation state point;
s240), adjusting an alcohol supply flow regulating valve, and adjusting the first medium state in the first medium channel from the highest working condition value supply which can be borne by the temperature simulation unit to a preset value supply according to a first simulation test state point;
s250) keeping the first medium in the first medium channel to be supplied to the temperature simulation unit according to the preset value of the experimental first simulation test state point to enter a stable working state, wherein the total temperature of the second medium passing through the outlet of the second medium channel is the same as the total temperature of the air intake of the engine in the first simulation state point.
4. The method of claim 1, wherein:
in the step S500, an oxygen supply flow regulating valve, an engine air inlet supply pressure regulating valve, an alcohol supply flow regulating valve and an engine fuel supply flow regulating valve are respectively regulated and adjusted, so that the total pressure, the total temperature and the oxygen content of a second medium at the outlet of a second medium channel are the same as the total intake pressure, the total temperature and the oxygen content of an Nth simulation state point engine, and the fuel supplied by a fuel supply source is the same as the fuel demand of the Nth simulation state point engine; wherein N is more than or equal to 2;
s510) adjusting an oxygen supply flow regulating valve to enable the oxygen content of the second medium at the outlet of the second medium channel to be the same as that of the engine at the Nth simulation state point;
s520), determining the supply temperature of the first medium according to the total temperature of the second medium at the outlet of the second medium channel, the mass of the second medium in the second medium channel, the constant-pressure specific heat of the second medium, the convective heat transfer coefficient of the inner wall of the pipe body, the area of the inner wall of the whole pipe body, the mass of the first medium in the first medium channel, the constant-pressure specific heat of the first medium, the convective heat transfer coefficient of the outer wall of the pipe body, the area of the outer wall of the whole pipe body and the total temperature of the second medium at the inlet of the second medium channel in the Nth simulation state point;
s530), adjusting an alcohol supply flow regulating valve, and regulating the state of the first medium in the first medium channel from the preset value supply of the first simulation test state point to the preset value supply according to the Nth simulation test state point;
s540), keeping the first medium in the first medium channel to be supplied to the temperature simulation unit according to the preset value of the Nth simulation test state point of the experiment to enter a stable working state, wherein the total temperature of the second medium passing through the outlet of the second medium channel is the same as the total temperature of the air intake of the engine at the Nth simulation state point;
s550) adjusting an engine air inlet supply pressure adjusting valve according to the total air inlet pressure of the Nth simulation state point, so that the total pressure of the second medium passing through the outlet of the second medium channel is the same as the total air inlet pressure of the engine of the Nth simulation state point;
and S560), adjusting the fuel supply flow regulating valve of the engine according to the fuel demand of the Nth simulation state point of the engine, so that the fuel supplied by the fuel supply source is the same as the fuel demand of the Nth simulation state point of the engine.
5. The method of claim 3, wherein:
the highest working condition value which can be borne by the temperature simulation unit is the highest pressure, the highest temperature and the highest flow of the first medium which can be borne by the temperature simulation unit; the parameters simulating the predetermined values of the test condition points include the pressure of the medium inlet and outlet, the flow rate of the medium, and the temperature of the medium.
6. The method according to claim 3 or 4, characterized in that:
in step S220, the state of step S210 is maintained until the temperature simulation unit enters the stable working state, and the required time is T1(ii) a In step S250, the first medium in the first medium channel is kept in a supply state according to the predetermined value of the experimental first simulation test state point until the temperature simulation unit enters a stable working state, and the required time is T2(ii) a In step S540, the first medium in the first medium channel is kept in a state of being supplied to the temperature simulation unit according to the predetermined value of the nth simulation test state point of the experiment, and the temperature simulation unit enters a stable working state, and the required time is TN；
T1，T2And TNAll the parameters are determined according to a calculation formula when the temperature simulation unit enters a stable working state; the temperature simulation unit enters a stable working state and has the following calculation formula:
in the formula: t isxThe unit is s, and the time for the temperature simulation unit to enter a stable working state; m is the mass of the whole pipe body, the unit is kg, and the m is a known quantity; c. CmpThe specific heat at constant pressure of the pipe body is given as J/kg.K, which is a known quantity; h ishIs the convective heat transfer coefficient of the inner wall of the tube body and has the unit of W/(m)2K), in known amounts; a. thesiIs a whole pipe bodyInner wall area of (d) in m2Is a known amount; m ishIs the mass of the first medium in kg, a known quantity, in the first medium channel; c. CphThe specific heat at constant pressure of the first medium is given as J/kg.K, and is a known quantity; h iscIs the convective heat transfer coefficient of the outer wall of the tube body and has the unit of W/(m)2K), in known amounts; a. theseIs the outer wall area of the whole pipe body and has the unit of m2Is a known amount; m iscIs the mass of the second medium in kg, a known quantity, in the second medium channel; c. CpcThe specific heat at constant pressure of the second medium is expressed in J/kg.K and is a known amount.
7. The method according to claim 3 or 4, characterized in that:
in step S230, determining a supply temperature of the first medium according to a total temperature of the second medium at an outlet of the second medium channel, a mass of the second medium in the second medium channel, a constant pressure specific heat of the second medium, a convective heat transfer coefficient of an inner wall of the tube body, an area of the inner wall of the entire tube body, a mass of the first medium in the first medium channel, a constant pressure specific heat of the first medium, a convective heat transfer coefficient of an outer wall of the tube body, an outer wall area of the entire tube body, and a total temperature of the second medium at an inlet of the second medium channel in the first simulation state point, where the supply temperature of the first medium is Thi1；
In step S520, determining a supply temperature of the first medium according to the total temperature of the second medium at the outlet of the second medium channel, the mass of the second medium in the second medium channel, the constant pressure specific heat of the second medium, the convective heat transfer coefficient of the inner wall of the tube body, the area of the inner wall of the entire tube body, the mass of the first medium in the first medium channel, the constant pressure specific heat of the first medium, the convective heat transfer coefficient of the outer wall of the tube body, the area of the outer wall of the entire tube body, and the total temperature of the second medium at the inlet of the second medium channel at the nth simulation state point, where the supply temperature of the first medium is ThiN；
Thi1And ThiNAll determined according to a heat flow input temperature formula of a temperature simulation unit; the heat flow input temperature formula of the temperature simulation unit is as follows:
in the formula:
Thixis the feed temperature of the first medium in K; t iscoThe total temperature of the second medium at the outlet of the second medium channel is K and is a known quantity; m iscThe mass of the second medium in the second medium channel is kg, and is a known quantity; c. CpcThe specific heat at constant pressure of the second medium is given as J/kg.K, and is a known quantity; h ishIs the convective heat transfer coefficient of the inner wall of the tube body and has the unit of W/(m)2K), in known amounts; a. thesiIs the inner wall area of the whole pipe body and has the unit of m2Is a known amount; m ishIs the mass of the first medium in the first medium channel, the unit is kg, and is a known quantity; c. CphThe specific heat at constant pressure of the first medium is given as J/kg.K, and is a known quantity; h iscIs the convective heat transfer coefficient of the outer wall of the tube body and has the unit of W/(m)2K), in known amounts; a. theseIs the outer wall area of the whole pipe body and has the unit of m2Is a known amount; t isciThe total temperature of the second medium, in K, which is the inlet of the second medium channel, is a known quantity.
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