真空条件下液滴闪蒸的非均温建模与分析

发布时间：2018-05-31 07:01

  本文选题：闪蒸 + 非均温　； 参考：《航空动力学报》2017年05期

【摘要】：为深入揭示液滴在真空环境下的闪蒸机理,建立了真空闪蒸全过程、非均温的传热传质数学模型,获得了各时刻液滴温度场及半径,并能够追踪结冰阶段的相变界面位置.通过开展液滴闪蒸的实验研究,观察了相变前后液滴的形态变化,并对数值模型进行了验证.基于数学模型,研究了液滴初始半径、初始温度、真空舱压力和结冰过冷度对闪蒸过程的影响规律.结果表明:真空舱压力是影响闪蒸过程的主要因素,且会影响最终平衡温度;初始半径主要影响预冷和冻结时间,而初始温度和结冰过冷度主要只影响预冷时间.
[Abstract]:In order to reveal the mechanism of droplet flash in vacuum environment, a mathematical model of heat and mass transfer at heterogeneous temperature in the whole process of vacuum flash was established. The temperature field and radius of droplet at every moment were obtained, and the position of phase transition interface in freezing stage could be traced. The morphological changes of droplets before and after phase transition were observed and the numerical model was verified by the experimental study of droplet flash evaporation. Based on the mathematical model, the effects of initial radius, initial temperature, pressure of vacuum chamber and degree of supercooling on the flash process were studied. The results show that the vacuum chamber pressure is the main factor affecting the flash process and the final equilibrium temperature, and the initial radius mainly affects the precooling and freezing time, while the initial temperature and the supercooling degree only affect the precooling time.
【作者单位】： 北京航空航天大学航空科学与工程学院;中国航天科技集团公司西安航天动力研究所液体火箭发动机技术重点实验室;
【分类号】：O552.6
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本文编号：1958739