论文部分内容阅读
受空间热流的作用,相变是低温推进剂在轨压力控制中需要被考虑到的影响因素。为研究液氢贮箱内的流体行为特性,建立了低温流体CFD仿真模型,对于相变过程,基于不同的相变传质理论,建立了四种相变仿真模型。根据NASA开展的AS-203液氢贮箱压力上升试验数据,对封闭贮箱内压力上升和温度分布开展仿真预示,分析了不同相变仿真模型对压力上升和温度分布预示的结果。结果表明,相变模型1和相变模型3得到的压力上升速率和温度场结果与试验结果趋势较为一致。受到算法和适用性的影响,相变模型2和相变模型4对AS-203液氢贮箱的温度预示偏差较大,相变模型4对压力上升的预示偏差较大。
Affected by the space heat flux, the phase change is the influencing factor that the low temperature propellant needs to be considered in the orbital pressure control. In order to study the fluid behavior in the liquid hydrogen storage tank, a CFD simulation model of cryogenic fluid was established. For the phase transition process, four phase transition simulation models were established based on different phase transition mass transfer theory. According to the pressure rise test data of AS-203 liquid hydrogen storage tank developed by NASA, the pressure rise and temperature distribution in the closed tank are simulated and predicted. The results of pressure rise and temperature distribution of different phase change simulation models are analyzed. The results show that the pressure rise rate and temperature field obtained by the phase change model 1 and the phase transition model 3 are in good agreement with the experimental results. Affected by the algorithm and the applicability, the temperature variation of phase-change model 2 and phase-change model 4 to AS-203 liquid hydrogen storage tank is larger, and the phase change model 4 shows larger deviation from the pressure rise.