热力学排气系统对液氮贮箱控压特性的影响分析

为研究热力学排气系统(TVS)对低温推进剂贮箱控压特性的影响，搭建了液氮热力学排气技术控压试验平台，开展了混合模式和并行模式下的低温贮箱控压试验，研究了不同控压区间气枕压力及液相温度的变化规律，对并行模式过程中节流特性以及节流制冷量的输入对液相温度变化的影响进行了分析。试验结果表明，在混合模式中由于外部漏热和气枕压力的影响，液相温度呈波浪式上升趋势;在并行模式中，在节流制冷量输入和外部漏热的共同作用下，液相温度停止上升转而下降；在两种模式运行中，液相温度在较高的控压区间比较低的区间变化率大；理论模型能够较好反映试验测试结果，模拟分析得到的液相温度变化率与试验结果基本一致。

Analysis for the Effects of TVS on the Pressure Control Characteristics of the Liquid Nitrogen Storage Tank #br#

To study the effects of the thermodynamics venting system (TVS) on the pressure control characteristics of the cryogenic propellant tank, the principle and running strategy of TVS are illustrated firstly. A pressure control test platform using liquid nitrogen as medium is built, and the pressure control tests of the cryogenic tank are carried out in the mixing mode and parallel mode. In addition, the change laws of the ullage pressure and liquid temperature in different pressure control intervals are investigated, and the Joule-Thomson effects on the liquid temperature when the cooling power is imported into the liquid nitrogen in the process of parallel mode are also studied. The experimental results show that in the mixing mode, due to the influence of the external heat leakage and ullage pressure, the liquid temperature shows a wave like upward trend, in the parallel mode it stops rising and then decreases due to the joint effect of cooling power and heat leakage. In the two running modes above, the liquid temperature changes more apparently in higher pressure control region than in the lower region. The change rate of the liquid temperature obtained by simulation analysis is basically consistent with the test results