Modeling and validating of air cycle machine in aircraft environmental control system

doi:10.11949/0438-1157.20191125

Abstract

Abstract:

Mathematical models of compressor-turbine-fan air cycle machine were established in aircraft environmental control system. The simulation models of air cycle machine were developed. The performance test principles and procedures are put forward for the product and performance tests are carried out to obtain the performance data under design conditions. By comparing simulation results and experimental data for compressor pressure ratio and efficiency characteristics, turbine temperature drop, fan pressure rise, the simulation model was corrected and validated. Results show that the modeling method provided in this paper can calculate the performance of the air cycle machine accurately with the ±10% simulation error. The simulation precision meets the requirements of aircraft environmental control system engineering design and it is helpful to develop environmental control system and its components.

Key words: thermodynamics, computer simulation, dynamic modeling, experimental check, air cycle, environmental control system

摘要：

建立了飞机环境控制系统中压气机-涡轮-风扇式空气循环机的数学模型并开发了性能仿真模型；提出了性能试验原理及方法并开展了性能试验获得了设计工况下测试数据；通过对比不同转速下压气机增压比和效率特性、不同膨胀比条件下涡轮的温降特性、风扇压升特性等仿真结果与试验数据，修正了所建仿真模型相关参数并校核了模型有效性。结果表明，提出的仿真建模方法能够对空气循环机进行准确计算，经修正后仿真误差可以控制在±10%以内，仿真精度满足飞机环境控制系统工程设计要求，对环控系统及部件研制具有重要意义。

关键词: 热力学, 计算机模拟, 动态建模, 试验校核, 空气循环, 环控系统

CLC Number:

V 245.3

Fanxin MENG, Jianing SUN, Yue ZHOU, Zanjun GAO, Dingbin CHENG. Modeling and validating of air cycle machine in aircraft environmental control system[J]. CIESC Journal, 2020, 71(S1): 328-334.

孟繁鑫, 孙佳宁, 周月, 高赞军, 程定斌. 飞机环控系统空气循环机仿真建模及试验校核[J]. 化工学报, 2020, 71(S1): 328-334.

Figures/Tables 6

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转速/ （r·min^-1）	流量/ （kg·s^-1）	压比			效率
转速/ （r·min^-1）	流量/ （kg·s^-1）	试验	计算	误差/%	试验	计算	误差/%
25000	0.1	1.15	1.17	1.7	0.80	0.80	0.0
25000	0.15	1.03	1.07	3.9	0.40	0.36	10.0
30000	0.1	1.30	1.28	1.5	0.85	0.85	0.0
30000	0.15	1.20	1.20	0.0	0.75	0.71	5.3
35000	0.15	1.37	1.37	0.0	0.80	0.80	0.0
35000	0.2	1.22	1.23	0.8	0.60	0.58	3.3
40000	0.2	1.45	1.43	1.4	0.80	0.79	1.3
40000	0.25	1.13	1.08	4.4	0.20	0.18	10.0
45000	0.2	1.62	1.61	0.6	0.80	0.80	0.0
45000	0.25	1.45	1.45	0.0	0.70	0.68	2.9

转速/ （r·min^-1）	流量/ （kg·s^-1）	压比			效率
转速/ （r·min^-1）	流量/ （kg·s^-1）	试验	计算	误差/%	试验	计算	误差/%
25000	0.1	1.15	1.17	1.7	0.80	0.80	0.0
25000	0.15	1.03	1.07	3.9	0.40	0.36	10.0
30000	0.1	1.30	1.28	1.5	0.85	0.85	0.0
30000	0.15	1.20	1.20	0.0	0.75	0.71	5.3
35000	0.15	1.37	1.37	0.0	0.80	0.80	0.0
35000	0.2	1.22	1.23	0.8	0.60	0.58	3.3
40000	0.2	1.45	1.43	1.4	0.80	0.79	1.3
40000	0.25	1.13	1.08	4.4	0.20	0.18	10.0
45000	0.2	1.62	1.61	0.6	0.80	0.80	0.0
45000	0.25	1.45	1.45	0.0	0.70	0.68	2.9

转速/ （r·min^-1）	流量/ （kg·s^-1）	出口压力/kPa			出口温度/℃
转速/ （r·min^-1）	流量/ （kg·s^-1）	试验	计算	误差/%	试验	计算	误差/%
25000	369	116.9	115.9	0.9	43.7	44	0.7
30000	462	125.9	124.2	1.4	51.7	50.7	1.9
35000	486	138.4	136.6	1.3	62	62	0.0
40000	567	148.4	146.2	1.5	70	67.9	3.0
45000	691	160.3	159.6	0.4	80	80.2	0.2

转速/ （r·min^-1）	流量/ （kg·s^-1）	出口压力/kPa			出口温度/℃
转速/ （r·min^-1）	流量/ （kg·s^-1）	试验	计算	误差/%	试验	计算	误差/%
25000	369	116.9	115.9	0.9	43.7	44	0.7
30000	462	125.9	124.2	1.4	51.7	50.7	1.9
35000	486	138.4	136.6	1.3	62	62	0.0
40000	567	148.4	146.2	1.5	70	67.9	3.0
45000	691	160.3	159.6	0.4	80	80.2	0.2

压力/ kPa	温度/ ℃	流量/ （kg·h^-1）	背压/ kPa	转速/ （r·min^-1）	出口温度/℃
压力/ kPa	温度/ ℃	流量/ （kg·h^-1）	背压/ kPa	转速/ （r·min^-1）	试验	计算	误差
180.0	40.4	504	100.5	25880	10.2	7.4	2.8
216.9	45.7	683	100.9	31730	-0.6	2.7	3.3
260.8	46.2	916	101.8	37300	-10.4	-6.7	3.7
314.3	47.0	1125	102.7	40170	-14.6	-14.7	0.1
426.0	49.3	1577	105.1	45350	-24.7	-25.1	0.4