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低气压温控设备用于模拟临近空间低气压和高低温环境,低气压环境的温度场控制是低气压温控设备的关键指标,也是设计难点。文章首先通过Fluent软件对无风扇扰动的低气压舱中的环境温度进行数值仿真,研究热沉开孔对舱内环境温度的影响;在低气压舱模型中增加风扇模型,分析强制换热对低气压舱内环境温度的影响。通过在低气压温控设备中进行的无强制对流的温度控制试验,研究此时空间温度的降温速率、试验舱压力和舱内试件工装对舱内环境温度的影响。数值计算和试验研究结果表明,热沉开孔、扰动风扇、试验舱压力和试件工装均对低气压舱内环境温度有影响,在低气压温控设备的研制中,需综合考虑上述因素。
Low-pressure temperature control equipment is used to simulate the low-pressure and high-temperature environment in the adjacent space. The control of the temperature field in the low-pressure environment is a key indicator of the low-pressure temperature control equipment and also a design difficulty. The paper first uses Fluent software to simulate the ambient temperature in a low-pressure cabin with no fan disturbance to study the influence of heat-sink opening on the ambient temperature in the cabin. Adds the fan model to the low-pressure cabin model to analyze the effect of forced heat exchange on low Influence of atmospheric temperature inside the cabin. Through the temperature control experiment without forced convection conducted in the low temperature and temperature control equipment, the influence of the cooling rate of the space temperature, the pressure of the test chamber and the ambient temperature of the test chamber on the cabin were studied. The results of numerical calculation and experimental study show that the heat sink opening, disturbance fan, test chamber pressure and specimen tooling both have an impact on the ambient temperature in the low-pressure cabin. In the development of low-pressure temperature control equipment, the above factors must be taken into consideration.