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基于全舱布泵概念设计的内置式深冷泵是真空羽流效应实验中维持真空舱内动态真空度的关键设备。对基于麦克斯韦速度分布假设的内置式深冷泵抽速计算公式分析发现,该式不适用于带喷流的空间发动机羽流实验舱内的动态真空度和冷板面积计算。采用直接模拟蒙特卡罗(DSMC)方法对所设计的内置式深冷泵的抽速和真空舱内的动态真空度进行了数值模拟研究,结果表明DSMC方法在给定条件下能更准确地计算带喷流的空间发动机羽流实验舱内的动态真空度和冷板面积,计算结果与国外同类实验中空间发动机喷流流量与所需冷板面积的计算结果一致。
The built-in cryogenic pump based on the concept of full-cabin cloth pump is the key equipment to maintain the dynamic vacuum in the vacuum chamber in the experiment of vacuum plume effect. Based on Maxwell’s velocity distribution hypothesis, the built-in cryogenic pump pumping speed calculation formula analysis shows that this formula is not suitable for the dynamic vacuum degree and the plate area calculation in the spacecraft plume experiment chamber with jet flow. The direct simulation Monte Carlo (DSMC) method was used to simulate the pumping speed of the built-in cryogenic pump and the dynamic vacuum in the vacuum chamber. The results show that the DSMC method can calculate more accurately under the given conditions The dynamic vacuum degree and plate area in the plume experiment chamber with jet flow are consistent with the calculation results of the spray plate flow rate and the required cold plate area in the similar experiments in foreign countries.