航空供氧系统高空性能参数数值仿真

Numerical simulation of oxygen supply system’s performance parameters characteristic at high altitude

根据航空供氧系统高空性能的工作原理,利用理论简化结构模型和气体动力学知识,建立了供氧系统部分高空性能参数的数学模型.在Matlab/Simulink系统仿真环境下,对高空部分性能参数进行了数值仿真计算,分析了高空性能中的充氧时间控制以及供氧面罩余压与拉力管内压力的比值特性和各种结构参数对面罩余压大小的影响.通过对仿真计算结果与试验结果的对比分析,表明所建立的数学模型是有效的,采用的仿真计算方法符合计算精度要求,对供氧系统高空性能的设计和改进工作具有一定的参考作用.

The working process of aviation oxygen supply system（OSS）at high altitude was described,and the mathematic model for the performance parameters characteristics of OSS was built,combining with the principle of dynamics of gas flow.By the numerical simulation with Matlab/Simulink and the theoretical analysis,the performance parameters characteristics of OSS at high altitude were achieved.A detailed analysis was conducted for the characteristics of oxygen inflating time and ratio of pressure,and then the major parameters affecting the press in oxygen mask were found.The results are in good agreement with those measured in the experiments,which shows that the analytical model is correct and the simulation method is in accordance with the precision requirements.The study and its conclusions are useful for the design to the characteristics of OSS at high altitude and the system analyses.