Numerical Simulation of Phase Change and Heat Transfer in Cryogenic Tank under the Ground Microgravity Condition
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摘要: 为了预测航天器低温推进剂在轨工作时受热后的状态变化,采用二维轴对称Volume of Fluid(VOF)气液两相流计算流体力学模型,同时选择Lee提出的气液相变模型.由于模拟试验采用低温液氮贮箱,因此本文采用低温液氮贮箱为数值仿真对象.微重力情况下,贮箱内气枕区的压力和压力上升率均低于地面状况,重力水平越低,压力和压力上升率越小,并且气体形成的气枕区位置和形状因表面张力大小随温度不同而动态变化,液体区间的温差也随重力水平的降低而增大.Abstract: In order to predict the state of spacecraft cryogenic propellant heated on-orbit, a 2D axial Volume-of-Fluid (VOF) computational fluid dynamic model including liquid and gas is established, and the model of phase change is based on the theory which put forward by Lee. As simulation experiments used the liquid nitrogen tank, this article used the liquid nitrogen tank as the object of numerical simulation. The results show that, comparing with the ground condition, the rising rate of the ullage pressure and the pressure value are smaller under the microgravity condition, and the lower the level of gravity, the smaller the rising rate of the ullage pressure and the pressure value. The position and shape of the ullage changes dynamically with surface tension which varies with liquid temperature and the temperature differences in liquid nitrogen zone increase with the gravity reducing.
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Key words:
- Volume-of-Fluid (VOF) /
- Two-phase flow /
- Phase change /
- Microgravity
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