APU进/排气系统与本体性能的跨维度耦合仿真建模

doi:10.7527/S1000-6893.2025.32755

Abstract

Abstract:

Most existing studies employ zero-dimensional simulation models for the overall performance simulation of the Auxiliary Power Unit （APU）， while ignoring the impact of total pressure loss changes in the intake/exhaust system on the overall performance of the APU under different operating conditions. To improve the accuracy of calculation results， an APU Zero-dimensional Steady Model （AZSM） and an APU Multi-dimensional Steady Model （AMSM） were established. These models were achieved by integrating a high-fidelity three-dimensional Computational Fluid Dynamics （CFD） flow field calculation model with a low-fidelity zero-dimensional simulation model via a fully coupled dimensional scaling method， enabling the integrated calculation of the performance of the APU intake/exhaust system and the APU itself. Based on the aforementioned method， this study conducts computational analysis under three typical operating conditions， compares the results with those from the commonly used commercial software Gasturb， and further analyzes the impact of flight altitude （H） and flight speed （Ma） variations on various parameters. The results show that： in Case 1 （ground static state）， the calculation accuracy of both the AZSM and the AMSM increased by 0.02% compared with the results from Gasturb； in Case 2 （flight state at 9 km altitude）， the calculation accuracy of the AZSM increased by 12.75%， while that of the AMSM increased by 19.42%； in Case 3 （flight state at 12 km altitude）， the calculation accuracy of the AZSM increased by 8.54%， and that of the AMSM increased by 24.27%. These results confirm that the AMSM can more accurately calculate the overall performance parameters of the APU under different operating conditions.

Key words: APU, intake/exhaust system, dimension scaling, AZSM, AMSM

CLC Number:

V231.1

Shuangchao MA, Xinyao WANG, Chuanpeng LI, Hengying REN, Liangwei PANG. Cross-dimensional coupling simulation and modeling for APU intake/exhaust system and its own performance[J]. Acta Aeronautica et Astronautica Sinica, 2026, 47(7): 632755.

Figures/Tables 18

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部件	参数	数值
进气道	流量/（kg·s^-1）	3.17
动力压气机	压比效率	6.8 0.75
负载压气机	导叶角度/（°）压比效率	75 3.5 0.75
燃烧室	出口总温/K	1 380
涡轮	效率	0.85

参数	参考值^［5］	AZSM	AMSM	Gasturb
APU当量功率/kW	272.00	272.44	272.16	272.06
APU当量耗油率/（kg·kW^-1·h^-1）	0.502	0.514	0.506	0.500
APU动力压气机耗功/kW	620.00	621.53	620.47	620.12
APU动力压气机出口温度/K	615.00	616.74	615.56	615.44
APU供油量/（kg·s^-1）	0.038 0	0.038 2	0.037 9	0.038 0
APU涡轮功/kW	931.00	931.24	931.35	931.11
APU排气温度/K	781.00	781.44	781.32	781.06
APU负载压气机耗功/kW	209.00	208.57	209.73	209.01
APU负载压气机出口相对折合流量/（kg·s^-1）	0.423 0	0.429 9	0.429 9	0.429 9

工况	大气压力/Pa	大气温度/K	Ma	流量/（kg·s^-1）
1	101 325	288	0	3.17
2	29 647	228	0.7	1.20
3	18 547	217	0.8	0.96

工况	修正后的总压恢复系数	修正后的流量/（kg·s^-1）	精度提升幅度/%
2	0.81	1.22	18.44
3	0.74	0.99	24.16

Cross-dimensional coupling simulation and modeling for APU intake/exhaust system and its own performance

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