CN111023875A - Efficient supercritical kerosene condenser for active cooling test - Google Patents
Efficient supercritical kerosene condenser for active cooling test Download PDFInfo
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- CN111023875A CN111023875A CN201911300988.2A CN201911300988A CN111023875A CN 111023875 A CN111023875 A CN 111023875A CN 201911300988 A CN201911300988 A CN 201911300988A CN 111023875 A CN111023875 A CN 111023875A
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- heat exchange
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- condenser
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- kerosene
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/08—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag
- F28D7/082—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a high-efficiency supercritical kerosene condenser for an active cooling test, which comprises at least two rows of heat exchange modules arranged in parallel, wherein each row of heat exchange modules comprises a plurality of heat exchange tubes arranged horizontally. Each heat exchange tube comprises an external heat exchange shell and an internal heat exchange shell which are coaxially sleeved together and have the same length, and an annular cooling channel with two closed ends is formed between the external heat exchange shell and the internal heat exchange shell. In the same row, the end parts of two adjacent internal heat exchange shells are sequentially connected, so that the internal heat exchange shells form a snakelike fluid channel communicated with each other; the end parts in the adjacent external heat exchange shells are sequentially connected so that the external heat exchange shells form a snakelike fluid channel communicated with each other; between two adjacent rows, the outlet of the heat exchange module in the front row is communicated with the inlet of the heat exchange module in the back row. Thereby ensuring the safe recovery and high-pressure maintenance of the supercritical heating kerosene after the open-loop active cooling test of the engine.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of heat exchangers, and particularly relates to a high-efficiency supercritical kerosene condenser for an active cooling test.
[ background of the invention ]
With the continuous development of novel aerospace craft technology, the wide range requirements of all countries in the world on the working airspace and speed domain of the craft are more urgent, and correspondingly, the requirements on the thermal structure and the reusability of an engine under the hypersonic condition are also more urgent. Compared with theoretical analysis and numerical simulation research, the thermal structure and the reusability of the engine are examined for a long time by means of a large number of ground tests and flight tests. For the ground open-loop active cooling direct connection test of the engine, kerosene is used as a coolant to actively cool the wall surface of the engine, in order to ensure that the kerosene does not boil in a cooling channel, the pressure in the cooling channel is generally higher than the critical pressure of the kerosene, and the kerosene absorbs heat along with the heating of the wall surface by gas and is heated, so that cracking reaction is carried out, components are changed, and the typical supercritical fluid characteristic that the pressure is higher than the critical pressure is presented. The density, viscosity, specific heat capacity, heat conductivity coefficient and the like of the supercritical fluid are changed along with the temperature and pressure, so that the system stability and flow control and supercritical pressure maintaining difficulty of the engine open-loop active cooling test are high, and the adoption of the condenser for cooling the supercritical high-temperature kerosene is an effective scheme for solving the problems. However, it is worth noting that the flow of supercritical high-temperature kerosene required by the engine open-loop active cooling test is usually small, the pressure is high, the temperature change range is large, the problems of low heat exchange efficiency, large volume size, large cooling water flow demand and excessive temperature and pressure of heat exchange materials are easily caused by adopting a conventional heat exchanger, and the efficient heat exchange of a supercritical kerosene condenser required by the engine open-loop active cooling direct connection test under a high-temperature and high-pressure environment cannot be met.
[ summary of the invention ]
The invention aims to provide an efficient supercritical kerosene condenser for an active cooling test, so that high-pressure maintenance, system stability and safe kerosene recovery of supercritical heating kerosene in a cooling channel in an engine open-loop active cooling test are ensured.
The invention adopts the following technical scheme: active cooling is high-efficient supercritical kerosene condenser for experiment, including at least two rows of parallel and parallel arrangement's heat exchange module, each row of heat exchange module all includes many levels to the heat exchange pipe that sets up, and many heat exchange pipes interval sets up, and parallels.
Each heat exchange tube comprises an external heat exchange shell and an internal heat exchange shell which are coaxially sleeved together and have the same length, and an annular cooling channel with two closed ends is formed between the external heat exchange shell and the internal heat exchange shell.
In the same row, the end parts of two adjacent internal heat exchange shells are sequentially connected, so that the internal heat exchange shells form a snakelike fluid channel communicated with each other; the end parts in the adjacent external heat exchange shells are sequentially connected so that the external heat exchange shells form a snakelike fluid channel communicated with each other; between two adjacent rows, the outlet of the heat exchange module in the front row is communicated with the inlet of the heat exchange module in the back row.
Furthermore, two adjacent internal heat exchange shells are communicated through a long-diameter elbow.
Furthermore, two adjacent external heat exchange shells are communicated through a vertically arranged connecting pipe.
Further, the heat exchange tubes in the two rows are equal in number and consistent in length.
Further, in the heat exchange modules of the frontmost row and the rearmost row, the outer heat exchange shell and the inner heat exchange shell of the head end are communicated with the outside, and a fluid inlet, a fluid outlet, an inlet of the coolant and an outlet of the coolant are formed, wherein the fluid inlet and the outlet of the coolant are in the same row of heat exchange modules, and the fluid outlet and the inlet of the coolant are in the same row of heat exchange modules, so that a state of convection of the fluid and the coolant is formed.
Furthermore, the openings of the internal heat exchange shell are respectively connected with a bent pipe for connecting with an external fluid pipeline.
The invention has the beneficial effects that: 1. kerosene flows into the internal heat exchange shell without being shunted again, the difference between the selected inner and outer pipe diameters is small, the area of an annular channel for cooling water to flow is small, the flowing speed is high, and the heat exchange efficiency of the cooling water is improved; the low-temperature cooling water enters the annular passage and can rapidly cool the kerosene. 2. The circular heat exchange shell is adopted, so that the pressure bearing capacity is high, the pressure requirement of the supercritical high-temperature high-pressure kerosene is met, and the safety is good. Through 180 degrees elbow joints with each heat transfer module snakelike series connection for this condenser can increase heat transfer module according to different use operating mode, increases or reduces effective heat transfer area, still convenient to overhaul simultaneously.
[ description of the drawings ]
FIG. 1 is a schematic structural diagram of a high-efficiency supercritical kerosene condenser for active cooling test according to the present invention;
fig. 2 is a front view of the condenser of the present invention.
Wherein: a. a heat exchange tube; 1. the heat exchanger comprises an external heat exchange shell, 2 external heat exchange shell connecting pipes, 3 long-diameter elbows, 4 external heat exchange shell blocking plates, 5 internal heat exchange shells, 6 elbows and 7 inverted L-shaped pipes; 8. and (4) connecting the pipes.
[ detailed description ] embodiments
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The embodiment of the invention discloses a high-efficiency supercritical kerosene condenser for an active cooling test, which comprises at least two rows of heat exchange modules arranged in parallel as shown in figure 1, wherein each row of heat exchange modules comprises a plurality of heat exchange tubes a arranged horizontally, and the heat exchange tubes a are arranged at intervals and are parallel.
Each heat exchange tube a comprises an external heat exchange shell 1 and an internal heat exchange shell 5 which are coaxially sleeved together and have the same length, and an annular cooling channel with two closed ends is formed between the external heat exchange shell 1 and the internal heat exchange shell 5. The inner diameters of the external heat exchange shell 1 and the internal heat exchange shell 5 and the sectional area of the formed annular cooling channel are both required cold and hot fluid flow, and the temperature difference is determined by calculation, and the basic principle is that the pipe diameters of the external heat exchange shell 1 and the internal heat exchange shell 5 are not greatly different, and the sectional area of the formed annular cooling channel is not too large. For cooling the small-flow ultrahigh-temperature high-pressure kerosene, the high-efficiency reliable cooling under the condition of small volume of the heat exchanger can be realized.
In the same row, the end parts of two adjacent internal heat exchange shells 5 are connected in sequence, so that the internal heat exchange shells 5 form a serpentine fluid channel communicated with each other; the end parts in the adjacent external heat exchange shells 1 are sequentially connected, so that the external heat exchange shells 1 form a snakelike fluid channel communicated with each other; between two adjacent rows, the outlet of the heat exchange module in the front row is communicated with the inlet of the heat exchange module in the back row. Two adjacent inner heat exchange shells 5 are communicated through a long-diameter elbow 3. The radian of the long-diameter elbow 3 is 180 degrees. Two adjacent external heat exchange shells 1 are communicated through a vertically arranged connecting pipe 8. The heat exchange tubes a in the two rows are equal in number and consistent in length.
In the heat exchange modules at the frontmost row and the rearmost row, the inner heat exchange shell 1 and the inner heat exchange shell 5 at the head end are communicated with the outside, and a fluid inlet, a fluid outlet, a coolant inlet and a coolant outlet are formed, wherein the fluid inlet and the coolant outlet are in the same heat exchange module at the row, and the fluid outlet and the coolant inlet are in the same heat exchange module at the row, so that a state of convection of fluid and coolant is formed.
One of the openings of the internal heat exchange shell 5 of the head end is a fluid inlet, and the other opening is a fluid outlet; an inverted L-shaped pipe 7 communicated with the inside of the external heat exchange shell 1 is vertically arranged on the external heat exchange shell 1 at the head end and positioned at one end of the opening of the internal heat exchange shell 5; an inverted "L" shaped pipe 7 at the outlet of the fluid flow is the inlet of the coolant, and the other is the outlet of the coolant; the openings of the internal heat exchange shell 5 are respectively connected with a bent pipe 6 for connecting with an external fluid pipeline.
Both ends are provided with annular baffle about outside heat transfer casing 1 to realize the closure at both ends, in the concrete implementation process, welded connection between baffle and outside heat transfer casing 1 and inside heat transfer casing 5. The thickness of the shell is calculated according to a circular tube pressure-bearing capacity formula, and the thickness of the blocking plate is calculated by considering the welding strength between the blocking plate and the circular tube.
High-temperature kerosene flows in the internal heat exchange shell 5, low-temperature cooling water reversely flows with the high-temperature kerosene in an annular cooling channel between the external heat exchange shell 1 and the internal heat exchange shell 5, and the sectional area of the annular cooling channel between the inner pipe and the outer pipe is smaller, so that the heat exchange efficiency of the cooling water is improved. After the required diameter is calculated according to the convection heat exchange relational expression, the outer pipe can be processed by selecting a finished steel pipe with the diameter smaller than the theoretical diameter of the outer pipe, and the inner pipe can be processed by selecting a finished steel pipe with the diameter larger than the theoretical calculated diameter of the inner pipe, so that the required heat exchange area and length can be reduced; and in the internal heat exchange shell part, if the internal circular sectional area is too small, the flow speed of the high-temperature kerosene is higher, the heat exchange efficiency of the high-temperature kerosene side is higher, and the wall surface temperature of the internal heat exchange shell is easily caused to exceed the allowable value of the material, so the pipe diameter of the internal heat exchange shell can select a relatively larger size according to the wall surface temperature calculated by heat transfer.
As shown in FIG. 2, is a front view of the condenser of the present invention, partially in section, with the inner heat exchange shell 5 having a diameter D1Thickness of the shell is t1The diameter of the external heat exchange shell 1 is D2Thickness of the shell is t2The two ends of the external heat exchange shell 1 are sealed by plugging plates, and the thickness of each plugging plate is t3. T in the figurefiIs the temperature of the high-temperature kerosene, twiIs the inner wall surface temperature of the inner tube, twoIs the temperature of the outer wall surface of the inner tube, tfoThe temperature of the cooling water, phi, the heat flow from the inside to the outside, h1Is the convective heat transfer coefficient of the kerosene in the inner tube, h2The convective heat transfer coefficient of the cooling water of the outer pipe can be obtained according to Dittus-Boelter empirical formula.
According to the formula
And obtaining the diameters of the inner pipe and the outer pipe and the required heat exchange area, and determining the pipe diameter and the pipe length.
The kerosene condenser disclosed by the invention is applied to an actual working condition, wherein the kerosene temperature is 900K, the pressure is 4MPa, the flow is 0.3kg/s, the cooling water temperature is 300K, the flow is 5kg/s, according to heat transfer calculation, a stainless steel round pipe with the outer diameter of 34mm and the wall thickness of 2mm is selected as an inner pipe, a stainless steel round pipe with the outer diameter of 57mm and the wall thickness of 3mm is selected as an outer pipe, the length of a single heat exchange module is 1112m, 13 heat exchange modules are arranged in series, the kerosene outlet temperature is reduced by 500K, the temperature rise of the cooling water is less than 20K, and the size length 1321mm and. And if a shell-and-tube heat exchanger is adopted to cool the high-temperature and high-pressure kerosene under the same conditions, the water flow is 25kg/s and is far greater than that required in the invention, and the length of the condenser is 3764mm, the height of the condenser is 760mm, and the volume of the condenser is far greater than that of the kerosene condenser in the invention.
Claims (6)
1. The efficient supercritical kerosene condenser for the active cooling test is characterized by comprising at least two rows of heat exchange modules which are arranged in parallel, wherein each row of heat exchange modules comprises a plurality of heat exchange tubes (a) which are horizontally arranged, and the heat exchange tubes (a) are arranged at intervals and are parallel;
each heat exchange tube (a) comprises an external heat exchange shell (1) and an internal heat exchange shell (5) which are coaxially sleeved together and have the same length, and an annular cooling channel with two closed ends is formed between the external heat exchange shell (1) and the internal heat exchange shell (5);
in the same row, the end parts of two adjacent internal heat exchange shells (5) are sequentially connected, so that the internal heat exchange shells (5) form a serpentine fluid channel communicated with each other; the end parts in the adjacent external heat exchange shells (1) are sequentially connected, so that the external heat exchange shells (1) form a snakelike fluid channel communicated with each other;
between two adjacent rows, the outlet of the heat exchange module in the front row is communicated with the inlet of the heat exchange module in the back row.
2. The high-efficiency supercritical kerosene condenser for active cooling test according to claim 1, characterized in that two adjacent internal heat exchange shells (5) are communicated with each other through a long-diameter elbow (3).
3. The high-efficiency supercritical kerosene condenser for active cooling test as claimed in claim 2, characterized in that two adjacent external heat exchange housings (1) are connected with each other through a vertically arranged connecting pipe (8).
4. The high efficiency supercritical kerosene condenser for active cooling test according to claim 1, 2 or 3, wherein the number of the heat exchange tubes (a) in the two rows is equal and the lengths thereof are the same.
5. The high efficiency supercritical kerosene condenser for active cooling test as defined in claim 1, 2 or 3, wherein in the heat exchange modules of the frontmost row and the rearmost row, the inside of said outer heat exchange housing (1) and the inside of said inner heat exchange housing (5) of the head end are communicated with the outside, forming a fluid inlet port, a fluid outlet port, a coolant inlet port and a coolant outlet port, wherein the fluid inlet port and the coolant outlet port are in the same row of heat exchange modules, and the fluid outlet port and the coolant inlet port are in the same row of heat exchange modules, so as to form a state of convection of the fluid and the coolant.
6. The high-efficiency supercritical kerosene condenser for active cooling test according to claim 5, characterized in that an elbow (6) is connected to each opening of the internal heat exchange shell (5) for connecting with an external fluid pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911300988.2A CN111023875A (en) | 2019-12-17 | 2019-12-17 | Efficient supercritical kerosene condenser for active cooling test |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911300988.2A CN111023875A (en) | 2019-12-17 | 2019-12-17 | Efficient supercritical kerosene condenser for active cooling test |
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| CN111023875A true CN111023875A (en) | 2020-04-17 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5989996A (en) * | 1982-10-18 | 1984-05-24 | アントン・シユタイネツカ−・マシ−ネンフアブリク・ゲ−エムベ−ハ− | Double pipe heat exchanger |
| CN2510815Y (en) * | 2002-01-11 | 2002-09-11 | 陈树标 | Multi-layer, high-efficient heat exchanger |
| CN102062548A (en) * | 2010-12-03 | 2011-05-18 | 袁孟军 | Multiple-series-sleeve large-temperature-difference heat exchange method and device |
| CN202057213U (en) * | 2011-05-10 | 2011-11-30 | 克拉玛依市金利化工有限责任公司 | Heat exchanger for precise fractionation device |
| CN103557716A (en) * | 2013-09-27 | 2014-02-05 | 中国科学院力学研究所 | Device for recycling high temperature kerosene of scramjet engine |
| CN107830751A (en) * | 2017-10-19 | 2018-03-23 | 天津商业大学 | A kind of efficient CO2Gas cooler |
-
2019
- 2019-12-17 CN CN201911300988.2A patent/CN111023875A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5989996A (en) * | 1982-10-18 | 1984-05-24 | アントン・シユタイネツカ−・マシ−ネンフアブリク・ゲ−エムベ−ハ− | Double pipe heat exchanger |
| CN2510815Y (en) * | 2002-01-11 | 2002-09-11 | 陈树标 | Multi-layer, high-efficient heat exchanger |
| CN102062548A (en) * | 2010-12-03 | 2011-05-18 | 袁孟军 | Multiple-series-sleeve large-temperature-difference heat exchange method and device |
| CN202057213U (en) * | 2011-05-10 | 2011-11-30 | 克拉玛依市金利化工有限责任公司 | Heat exchanger for precise fractionation device |
| CN103557716A (en) * | 2013-09-27 | 2014-02-05 | 中国科学院力学研究所 | Device for recycling high temperature kerosene of scramjet engine |
| CN107830751A (en) * | 2017-10-19 | 2018-03-23 | 天津商业大学 | A kind of efficient CO2Gas cooler |
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Application publication date: 20200417 |