CN-115795647-B - Performance matching design method for air-air integrated heat exchange device

CN115795647BCN 115795647 BCN115795647 BCN 115795647BCN-115795647-B

Abstract

The invention belongs to the field of thermal management of fuel inerting systems of aviation aircrafts, and particularly relates to a performance matching design method of an air-air integrated heat exchange device. At present, the function and reliability of the air-air integrated heat exchange device are designed and realized, and the function forward design and verification capability is lacking. According to the invention, through carrying out demand analysis on the flight envelope and the system working condition matched with the integrated heat exchange device, the working condition point of the integrated heat exchange device under the whole flight envelope is determined, the most severe heat exchange point is determined, and the performance matching design of the heat exchanger and the bypass valve is carried out aiming at all the working condition points, so that the performance structure scheme meeting the demand is obtained, and the problems of single point type and repeatability of the traditional design are solved. Through the determination of bypass flow ratio, the accurate control of outlet temperature can be realized, the heat exchange performance of the heat exchange device is improved, the thermal fatigue life analysis is performed, and the structural design of structural optimization and high reliability of the heat exchange device is ensured.

Inventors

LI RUI
WU CHAOYANG
ZHANG WEI
JIN XU
ZU WEIHUA
GUO LEIMING
Zhang Shunv
LIU XINXIN
LI YINGXUE

Assignees

新乡航空工业(集团)有限公司

Dates

Publication Date: 20260512
Application Date: 20221026

Claims (9)

1. The performance matching design method of the air-air integrated heat exchange device comprises a heat exchanger (1) and a temperature control valve (2), and is characterized in that the method is implemented by arranging a guide vane at the intersection position of a hot side inlet pipeline of the heat exchanger (1) and a bypass pipeline inlet where the temperature control valve (2) is positioned, and specifically comprises the following steps: S1, determining requirements Determining inlet temperature, flow and pressure of a cold side and a hot side of the heat exchange device, outlet temperature requirement of the hot side, flow resistance requirement and service life requirement of the heat exchange device; s2, working condition determination Determining working condition points of the integrated heat exchange device under the flight envelope according to the parameters obtained in the step S1; s3, performance matching analysis of heat exchanger and temperature control valve The structure of the heat exchange device is designed, comprising the structure and the size of a heat exchanger, the structure and the size of a temperature control valve, the shape, the position, the angle and the size of a flow deflector, and calculating the heat exchange performance of the heat exchange device based on each working point, wherein the heat exchange performance comprises bypass flow and flow resistance of the temperature control valve, the hot edge outlet temperature and flow resistance of the heat exchanger; s4, judging whether the result of the step S3 meets the requirement in the step S1, if so, entering the step S5, and if not, returning to the step S3; s5, high reliability design Performing thermal fatigue analysis to obtain the fatigue life of each part in the heat exchanger; S6, judging whether the fatigue life in the step S5 meets the requirement in the step S1, if so, completing the design, and if not, returning to the step S3.
2. The method of claim 1, wherein in step S1, the inlet temperature, flow rate and pressure of the cold and hot sides of the heat exchanger and the outlet temperature of the hot sides are determined based on the ambient temperature, flight speed, flight altitude, and aircraft inerting requirements of the aircraft fuel inerting system under the flight envelope.
3. The method of claim 1, wherein in step S3, when designing the structure of the heat exchanger, the fin size, the number of layers of the cold and hot sides, and the length of the cold and hot side channels of the heat exchanger core are adjusted first, and if the heat exchange performance still does not meet the requirement, the angle of the guide vane is further adjusted or the bypass flow size of the temperature control valve is reduced.
4. The method for designing a performance match for an air-air integrated heat exchanger of claim 1, wherein in step S3, When calculating the hot edge outlet temperature and the flow resistance of the heat exchanger, the specific steps are as follows: ① Giving the structural size of a heat exchanger core, and calculating the heat exchange performance of each working point to obtain the temperature of the hot side air outlet of the heat exchanger and the flow resistance delta P1 under each working point; ② Converting the flow resistance DeltaP 1 into a dimensionless parameter SigmaDeltaP 1, and plotting the SigmaDeltaP 1 against different air flow rates, wherein ; When calculating the bypass flow and the flow resistance of the temperature control valve, the specific steps are as follows: ① Given the structure and diameter of the bypass pipeline, selecting a control form of the temperature control valve; ② Calculating bypass flow and flow resistance of the temperature control valve under each working condition to obtain bypass flow and flow resistance delta P2 under different working condition points under the same valve opening degree, and bypass flow and flow resistance delta P2 under different valve opening degrees; ③ Converting the flow resistance delta P2 into a dimensionless parameter sigma delta P2, and drawing a bypass sigma delta P2 and a bypass flow curve, wherein 。
5. The method of claim 4, wherein the control valve comprises a butterfly valve, a shutter plate, or other forms.
6. The method for designing the performance matching of the air-air integrated heat exchange device according to claim 1, wherein in the step S5, the high reliability design comprises the steps of: ① Determining a thermal fatigue analysis working point; ② Determining boundary parameters; ③ Calculating fatigue life; ④ Thermal fatigue stress analysis.
7. The method of claim 1, wherein the structure, position and form of the flow guide plate are determined according to simulation results of pressure flow field distribution of the heat exchanger and the bypass of the temperature control valve.
8. The method for designing the performance matching of the air-air integrated heat exchange device according to claim 1, wherein the structure of each component of the heat exchanger is optimized and improved according to the analysis result of the thermal fatigue stress in the high-reliability design.
9. The performance matching design method of the air-air integrated heat exchange device according to claim 1, wherein the temperature control valve (2) adjusts the valve opening degree through a stepping motor and a variable speed gear mechanism, the stepping motor steps 60 degrees, the shaft steps 1.3 degrees, and the temperature control valve has a power-on reset function.

Description

Performance matching design method for air-air integrated heat exchange device Technical Field The invention belongs to the field of thermal management of fuel inerting systems of aviation aircrafts, and particularly relates to a performance matching design method of an air-air integrated heat exchange device. Background The inerting system processes high-pressure gas introduced from an engine compressor into nitrogen-rich gas with lower oxygen concentration suitable for inerting an oil tank, the nitrogen-rich gas is introduced into a fuel tank, the oil tank is ensured to be in an inerting safe state, an air-air heat exchange device is used as an indispensable accessory in a heat exchange system of the inerting system of the aeroengine and generally consists of a radiator 1 and a temperature control valve 2, as shown in fig. 1, high-temperature air exchanges heat with cold-side air through the heat exchanger 1, and the outlet temperature of the hot-side air is controlled within a required range. The hot side air flow passage of the heat exchanger is provided with a temperature control valve 2, and bypass flow is regulated by regulating the opening of the valve, so that the temperature of the hot side air outlet is controlled. The outlet temperature of the hot side of the heat exchange device is an important index of the whole system and needs to be ensured to be within a certain tolerance range. At present, the function and reliability of the air-air integrated heat exchange device are designed and realized, and the forward design and verification capability of the function are lacking, so that the internal and external environments of the whole flight covered wire product are not considered, the problem of ultra/low temperature after the heat exchange device is installed frequently occurs, the reliability is unreasonable in design and distribution, the identification and management are not in place, the reliability verification method and the qualification criterion are insufficient, and the leakage is frequently caused. Disclosure of Invention In view of the above-mentioned situation of the prior art, the invention provides a performance matching design method of a high-reliability air-air integrated heat exchange device, which is characterized in that through carrying out demand analysis on a flight envelope and a system working condition matched with the integrated heat exchange device, working condition points of the integrated heat exchange device under the whole flight envelope are determined, the most severe heat exchange point is determined, and the performance matching design of a heat exchanger and a temperature control valve is carried out aiming at the whole working condition points, so that a performance structural scheme meeting demands is obtained, and the problems of single point type and repeatability of the traditional design are solved. Through the determination of bypass flow ratio, the accurate control of outlet temperature can be realized, the heat exchange performance of the heat exchange device is improved, the thermal fatigue life analysis is performed, and the structural design of structural optimization and high reliability of the heat exchange device is ensured. The invention provides a performance matching design method of an air-air integrated heat exchange device, wherein the integrated heat exchange device comprises a heat exchanger and a temperature control valve, the method is implemented by arranging a guide vane at the crossing position of a hot side inlet pipeline of the heat exchanger and a bypass pipeline inlet where the temperature control valve is positioned, and the method specifically comprises the following steps: S1, determining requirements Determining inlet temperature, flow and pressure of a cold side and a hot side of the heat exchange device, outlet temperature requirement of the hot side, flow resistance requirement and service life requirement of the heat exchange device; s2, working condition determination Determining working condition points of the integrated heat exchange device under the flight envelope according to the parameters obtained in the step S1; s3, performance matching analysis of heat exchanger and temperature control valve The structure of the heat exchange device is designed, comprising the structure and the size of a heat exchanger, the structure and the size of a temperature control valve, the shape, the position, the angle and the size of a flow deflector, and calculating the heat exchange performance of the heat exchange device based on each working point, wherein the heat exchange performance comprises bypass flow and flow resistance of the temperature control valve, the hot edge outlet temperature and flow resistance of the heat exchanger; s4, judging whether the result of the step S3 meets the requirement in the step S1, if so, entering the step S5, and if not, returning to the step S3; s5, high reliability design Performing therm