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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。
In order to meet the reliability requirements of aerospace equipment, the high and low temperature environment simulation test is an important part of aerospace ground simulation test. During the cooling experiment, the thermal characteristics of the system need to be known to better control the temperature. In this paper, the dynamic simulation method is used to simulate the cooling process in the high and low temperature environment system, and a control strategy based on the outlet superheat of the liquid-liquid heat exchanger is proposed. Through the analysis, the better cooling process of the system . The analysis shows that the maximum allowable constant liquid nitrogen flow rate is 0.073 kg / s and the cooling time is 2,080 s with the control strategy of maintaining the superheat of 10 K.