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针对加注系统受注贮箱,采用CFD方法就液氮贮箱无排气加注过程开展数值仿真,对比了不同重力水平下的无排气加注性能,分析了加注口结构、壁面初始温度、加注流体温度和加注流量等因素对微重力无排气加注性能的影响规律。所构建的二维轴对称模型将流体区与固壁区一起作为求解区域并划分网格,并通过植入用户自定义程序(UDF)计算加注口液体闪蒸过程及气液之间的热质交换。经过实验数据验证,该模型能够合理展示箱内温度场分布和相分布情况,并获得贮箱压力等参数变化信息。数值计算结果表明:(1)加注条件相同时,微重力工况较常重力工况体现出更好的无排气加注性能。(2)微重力条件下,无排气加注性能几乎不受加注口结构的影响,壁面初始温度和加注流体温度越高,贮箱压力越高,加注流量仅对加注时间有显著影响。
Aimed at the filling tank of filling system, CFD method was used to simulate the process of non-exhaust filling of liquid nitrogen tank. The performance of non-exhaust filling under different gravity levels was compared. The structure of filler neck, initial wall temperature , Filling fluid temperature and filling flow and other factors on the performance of microgravity without exhaust filling law. The constructed two-dimensional axisymmetric model together with the fluid zone and the solid wall zone as the solution area and grid, and through the implantation of user-defined program (UDF) to calculate the filling liquid flashing process and the heat between the gas and liquid Exchange of quality. The experimental data show that the model can reasonably display the distribution of temperature field and the phase distribution in the tank, and obtain the information of tank pressure and other parameters. The numerical results show that: (1) When the filling conditions are the same, the microgravity conditions show better performance of no-vent filling compared with the normal gravity conditions. (2) Under the condition of microgravity, the performance of no-vent filling is almost unaffected by the structure of the filler neck. The higher the initial temperature of the wall and the temperature of the filler fluid, the higher the pressure of the tank. The filling flow rate is only for filling time Significantly affected.