摘要
为满足航天设备的可靠性要求,高低温环境模拟试验是航天地面模拟试验中重要的一环,在降温实验过程中,需要了解系统的热特性从而更好地降温控制。本文通过动态仿真方法,模拟了高低温环境系统中降温的动态过程,并且提出了一种基于气液换热器出口过热度来进行降温的控制策略,通过分析,确认了较好的系统降温过程。分析结果显示,系统允许的最大恒定液氮流量为0.073 kg/s,采用保持过热度为10 K的控制策略进行降温所需时间为2,080 s。
The high/low temperature environment test is an important part of spacecraft ground simulation test.Duringits cooling process,it is necessary to know the system thermal characteristics to take better cooling control.In this paper,the dynamic cooling process of high/low temperature environment system is simulated.And a control strategy isproposed based on the superheat degree of gas-liquid heat exchanger.The simulation results show that a good coolingprocess is achieved by the control strategy.For the current system,the maximum allowable liquid nitrogen flow rate is0.073kg/s,and the cooling time is2,080s with superheat degree of10K.
作者
徐君
吴静怡
XU Jun;WU Jingyi(Institute of Refrigeration and Cryogenics,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《制冷技术》
2017年第3期1-6,共6页
Chinese Journal of Refrigeration Technology
关键词
高低温环境模拟
特性
降温控制
过热度
High/low temperature environment test
Characteristics
Control of cooling
Superheat degree
