CN113483939B - Fixed position variable pressure fuel injection system - Google Patents

Fixed position variable pressure fuel injection system Download PDF

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CN113483939B
CN113483939B CN202110760028.5A CN202110760028A CN113483939B CN 113483939 B CN113483939 B CN 113483939B CN 202110760028 A CN202110760028 A CN 202110760028A CN 113483939 B CN113483939 B CN 113483939B
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pressure
valve
electromagnetic valve
measurement
fuel
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CN113483939A (en
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刘朝阳
贾东鹏
潘余
王宁
马磊
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National University of Defense Technology
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The invention relates to a fixed-position variable-pressure fuel injection system, and belongs to the field of fuel injection systems. The invention is composed of a high-pressure ethylene gas source, a pressure reducer, an electromagnetic valve, a one-way valve, a sonic nozzle, a tee joint, a connecting pipeline, a pressure sensor, a flowmeter, a controller and a measurement and control computer. The parts form a transportation system and a measurement and control system, and the function of dynamically adjusting the fuel injection pressure in the working process of the engine so as to adjust the global equivalence ratio is realized. The fuel injection device solves the problems of fixed position and adjustable pressure of the fuel injection in the combustion chamber of the scramjet engine, and has the advantages of quick response, simple system, low cost, good safety, stable work and the like.

Description

Fixed position variable pressure fuel injection system
Technical Field
The invention relates to an injection system for small flow gaseous fuel, in particular to a pressure dynamic change injection system for small flow gaseous fuel.
Background
The air-breathing scramjet engine does not need to carry an oxidant, and can realize higher thrust performance compared with the traditional engine under the condition of the same fuel consumption, so the air-breathing scramjet engine gradually becomes the best scheme of a hypersonic power system. The air inlet channel of the air-breathing scramjet engine has the severe change of inlet parameters in a very short time, and the global equivalence ratio also needs to be adjusted in real time according to the ballistic state. The reaction flow field in the working condition conversion stage of the engine shows obvious unsteady characteristics, particularly, flame stability is difficult to maintain in the wide Mach number and flight height range, and combustion oscillation or flameout is likely to occur. Therefore, working condition conversion is the key for realizing the power regulation of the engine, and the development of the research on the dynamic response characteristic of turbulent flame in the flow field reestablishment stage is very important.
In order to simulate the dynamic conversion process of the global equivalence ratio of the engine, a scheme for fixing the injection position and easily adjusting injection pressure in a test is required to be designed, and fuel with rated pressure and flow is injected into a concave combustion chamber of the engine.
The existing fuel supply systems are mainly divided into a pumping type and a squeezing type. Generally, the extrusion injection scheme is suitable for gaseous fuels such as hydrogen, ethylene and the like. It is directly injected from a high-pressure gas cylinder through a pressure reducer, and has the advantages of simple structure, low cost and the like. However, squeeze injectors generally require pressure to be maintained constant during operation and are relatively difficult to dynamically adjust during testing due to the lack of flow adjustment means. The pumping pressure type injection device pumps fuel through the centrifugal pump, can adjust the flow in real time, realizes dynamic switching of the flow, and has high response speed. However, it is difficult to supply gaseous fuels such as hydrogen and ethylene, and the minimum flow rate is required, and generally, the precision is low in a low flow rate condition, the operation is extremely unstable, the cost of the motor pump is high, and a special controller is required for driving.
Disclosure of Invention
In view of the above, the invention designs a pressure regulating system specially for small-flow gaseous fuel, which simulates the dynamic change of the pressure before the injection of a combustion chamber through devices such as an electromagnetic valve, a pressure reducer, a one-way valve and the like, and lays conditions for researching the working condition conversion process of an engine. The invention solves the problem of fuel injection with adjustable pressure and fixed position in the combustion chamber of the engine
The technical scheme adopted by the invention is as follows:
a fixed position variable pressure fuel injection system comprises a transportation system and a measurement and control system; the transportation system consists of a high-pressure ethylene gas source, a pressure reducer, an electromagnetic valve, a one-way valve, a sonic nozzle, a tee joint and a connecting pipeline; the measurement and control system consists of a pressure sensor, a flowmeter, a controller and a measurement and control computer.
In the transportation system, two ethylene fuel supply pipelines are arranged, each supply pipeline takes a high-pressure gas cylinder filled with ethylene fuel as a gas source, a pressure reducer, an electromagnetic valve and a one-way valve are respectively arranged at the downstream of the high-pressure gas cylinder, and the gas cylinder, the pressure reducer, the electromagnetic valve and the one-way valve are connected through pipelines; the two supply pipelines are connected through a tee joint and are injected into the cavity combustion chamber through the sonic nozzle.
The measurement and control system is divided into a measurement part and a control part, wherein the measurement part consists of a pressure sensor and a flowmeter which are arranged between the tee joint and the sonic nozzle, and is used for monitoring the pressure and the flow of the ethylene gas flow before spraying in real time; the control device arranged on the electromagnetic valve is a control part, and the two parts are connected with the controller and integrated to the measurement and control computer.
The beneficial effects of the invention are:
(1) the pressure before the gas fuel jet flow is sprayed can be dynamically changed along with time, and the global equivalence ratio of the engine can be adjusted in real time in the test process based on the pressure before the gas fuel jet flow is sprayed;
(2) the jetting device consists of two electromagnetic valves, a pressure reducer, a one-way valve and an ethylene gas bottle, the dynamic switching of ethylene jet jetting is controlled by the opening/closing of the valves, and the jetting device has the advantages of quick response, simple system, low cost and the like;
(3) a check valve is arranged between the gas source and the tee joint, so that the influence of downstream high pressure on the pressure reducer can be effectively avoided, and the safety of an experiment is effectively ensured;
(4) the gas fuel flow is controlled by the throttle area, so that gas injection with small flow can be realized.
Drawings
FIG. 1 is a schematic view of an insufflating system device;
FIG. 2 is a timing diagram for system pressure reduction;
fig. 3 is a timing diagram of system pressure rise.
Reference numbers:
11. 15-high pressure ethylene gas source, 12, 16-pressure reducer, 13, 17-electromagnetic valve, 14, 18-one-way valve, 19-three-way valve, 20-sonic nozzle, 21-flowmeter, 22-pressure sensor, 24-controller and 25-measurement and control computer.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
As shown in figure 1 of the drawings, in which,
a fixed position variable pressure fuel injection system comprises a transportation system and a measurement and control system; the transportation system consists of high-pressure ethylene gas sources 11 and 15, pressure reducers 12 and 16, electromagnetic valves 13 and 17, one- way valves 14 and 18, a tee joint 19, a sonic nozzle 20 and a connecting pipeline; the measurement and control system consists of a flowmeter 21, a pressure sensor 22, a controller 24 and a measurement and control computer 25.
In the transportation system, two ethylene fuel supply pipelines are arranged, each supply pipeline takes high- pressure gas cylinders 11 and 15 filled with ethylene fuel as gas sources, pressure reducers 12 and 16, electromagnetic valves 13 and 17 and one- way valves 14 and 18 are respectively arranged at the downstream of the high-pressure gas cylinders, and the gas cylinders 11 and 15, the pressure reducers 12 and 16, the electromagnetic valves 13 and 17 and the one- way valves 14 and 18 are connected through pipelines; the two supply pipelines are connected through a tee joint 19 and finally injected into the cavity combustion chamber through a sonic nozzle 20.
The measurement and control system is divided into a measurement part and a control part, wherein the measurement part consists of a flowmeter 21 and a pressure sensor 22 which are arranged between the tee joint and the sonic nozzle, and is used for monitoring the pressure and the flow of the ethylene gas flow before spraying in real time; the control devices arranged on the electromagnetic valves 13 and 17 are used as control parts, and the two parts are connected with a controller 24 and integrated into a measurement and control computer 25
Example 1: the injection pressure is from high to low
Before the test, the pressure reducing valves 12 and 16 are respectively arranged to ensure that the two paths of air flow are respectively high pressure (P)1) And low pressure (P)2) In this state, both the solenoid valves 13, 17 are in the closed state.
The design sequence in the measurement and control software is shown in figure 2(a), when t is<t0When the solenoid valves 13 and 17 are opened simultaneously, the pressure of the air flow downstream of the pressure reducing valve 12 is higher than the pressure downstream of the pressure reducing valve 16, so that only high-pressure air flow is injected into the cavity combustion chamber, but a low-pressure air source can fill the whole pipeline; the backflow of the high-pressure gas is not a concern due to the action of the check valves 14, 18. As shown in FIG. 2(b), the global equivalence ratio of the combustion chamber is now φ1. When t is>t0When the electromagnetic valve 13 is closed, the low-pressure gas fuel begins to enter the tee joint 19 through the one-way valve, and the equivalence ratio is suddenly reduced to phi2. The equivalence ratio function during the state switching is not an ideal step function, but has a certain slope, because the solenoid valve has response time and a small amount of fuel remains in the pipeline.
After the test is finished, the electromagnetic valves 13 and 17 are in a closed state at the same time.
Example 2: the injection pressure is from low to high
Before the test, the pressure reducing valves 12 and 16 are respectively arranged to ensure that the two paths of air flow are respectively high pressure (P)1) And low pressure (P)2) In this state, both the solenoid valves 13, 17 are in the closed state.
The design sequence in the measurement and control software is shown in figure 2(a), when t is<t0The solenoid valve 17 is opened and the solenoid valve 13 is closed as shown in FIG. 2(b), at which time the global equivalence ratio of the combustion chamber is φ1. When t is>t0When the electromagnetic valve 13 is opened, the high-pressure gas fuel begins to enter the three-way valve 19 through the one-way valve, and the equivalence ratio suddenly rises to phi2. Also, the equivalence ratio function has a certain slope during the state switching process due to the response time of the solenoid valve and the residual fuel in the pipeline.
While the foregoing specification illustrates and describes embodiments of the invention in its application, it is to be understood that the invention is not limited to the precise form disclosed herein and that modifications and other embodiments are not to be considered as exclusive of other embodiments, but may be used in various other combinations, modifications and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (1)

1. A fixed-position variable-pressure fuel injection system is characterized by comprising a transportation system and a measurement and control system; the transportation system consists of a first high-pressure ethylene gas source (11), a second high-pressure ethylene gas source (15), a first pressure reducing valve (12), a second pressure reducing valve (16), a first electromagnetic valve (13), a second electromagnetic valve (17), a first one-way valve (14), a second one-way valve (18), a sonic nozzle (20), a tee joint (19) and a connecting pipeline; the measurement and control system consists of a pressure sensor (22), a flowmeter (21), a controller (24) and a measurement and control computer (25); in the transportation system, two ethylene fuel supply pipelines are arranged, each supply pipeline takes a high-pressure gas cylinder filled with ethylene fuel as a gas source, a first pressure reducing valve (12), a second pressure reducing valve (16), a first electromagnetic valve (13), a second electromagnetic valve (17), a first one-way valve (14) and a second one-way valve (18) are respectively arranged at the lower part of the high-pressure gas cylinder, and the gas cylinder, the first pressure reducing valve (12), the second pressure reducing valve (16), the first electromagnetic valve (13), the second electromagnetic valve (17), the first one-way valve (14) and the second one-way valve (18) are connected through pipelines; the two supply pipelines are connected through a tee joint (19) and are injected into the cavity combustion chamber through a sonic nozzle (20); the measurement and control system is divided into a measurement part and a control part, a pressure sensor (22) and a flowmeter (21) which are arranged between the tee joint (19) and the sonic nozzle (20) form the measurement part, and the pressure and the flow before the ethylene gas flow is monitored in real time; the control devices arranged on the first electromagnetic valve (13) and the second electromagnetic valve (17) are control parts, and the two parts are connected with a controller (24) and integrated to a measurement and control computer (25);
the measurement and control software is respectively set according to that the jetting pressure is from high to low and the jetting pressure is from low to high, wherein when the jetting pressure is from high to low, the measurement and control software sets a time sequence as follows: when t is<t0When the first electromagnetic valve (13) and the second electromagnetic valve (17) are opened simultaneously, the pressure of the air flow downstream of the first reducing valve (12) is higher than the pressure downstream of the second reducing valve (16), so that only high-pressure air flow is injected into the concave cavity combustion chamber, but a low-pressure air source can fill the whole pipeline; the function of the first check valve (14) and the second check valve (18) does not need to worry about the backflow function of high-pressure gas, and the global equivalence ratio of the combustion chamber is
Figure FDA0003621956240000011
When t is>t0When the first electromagnetic valve (13) is closed, the low-pressure gas fuel begins to enter the tee joint (19) through the one-way valve, and the equivalence ratio is suddenly reduced to
Figure FDA0003621956240000012
Because the electromagnetic valve has response time and a small amount of fuel remains in the pipeline, the equivalence ratio function is not an ideal step function in the state switching process, but has a certain slope;
when the injection pressure is from low to high, the measurement and control software sets the time sequence as follows: when t is<t0When the second electromagnetic valve (17) is opened, the first electromagnetic valve (13) is closed, and the global equivalence ratio of the combustion chamber is
Figure FDA0003621956240000013
When t is>t0When the first electromagnetic valve (13) is opened, the high-pressure gas fuel begins to enter the tee joint (19) through the one-way valve, and the equivalence ratio rises suddenly to
Figure FDA0003621956240000014
Also, the equivalence ratio function has a certain slope during the state switching process due to the response time of the solenoid valve and the residual fuel in the pipeline.
CN202110760028.5A 2021-07-06 2021-07-06 Fixed position variable pressure fuel injection system Active CN113483939B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN202110760028.5A CN113483939B (en) 2021-07-06 2021-07-06 Fixed position variable pressure fuel injection system

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CN113483939B true CN113483939B (en) 2022-06-14

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Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1982667B (en) * 2006-03-31 2010-04-21 段玉献 Fuel supplier and supplying method for mixed-fuel engine
CN101539482B (en) * 2009-04-21 2010-08-18 北京航空航天大学 Electric propulsion testing platform gaseous-propellant supply device
CN203798524U (en) * 2014-03-31 2014-08-27 达丰（重庆）电脑有限公司 Square wave shock test nitrogen supplying device
CN107271189B (en) * 2017-06-12 2019-10-01 北京航空航天大学 A kind of propellant sustainable supply system for electric propulsion engine test for a long time
CN108398272B (en) * 2017-12-14 2019-11-12 中国航天空气动力技术研究院 A kind of fuel system and method for the test of shock tunnel super burn engine inlets
CN109459255B (en) * 2018-11-02 2021-10-26 北京航空航天大学 Multipurpose pipeline supply system with replaceable cathode gas source and replaceable flowmeter

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