以N2O为工质的汽蚀文氏管流场仿真

为得到N₂O在汽蚀文氏管中的汽蚀流场分布,以实际气体状态方程和完全汽穴模型为基础,求解两相混合物流动的控制方程组.针对N₂O的特点,对三种不同工况下文氏管的汽蚀流场分别考虑汽化热和不考虑汽化热进行了仿真,并对两种计算结果进行了对比分析.考虑汽化热计算得到的汽蚀区比不考虑汽化热计算得到的要小,而且汽蚀区及周边温度有明显的变化,计算结果更加真实合理,说明了考虑汽化热计算的必要性和正确性,对汽蚀文氏管的设计有一定的指导作用.

Flow field simulation of N2O cavitation Venturi

In order to get the distribution of cavitation flow field of N₂O in cavitation Venturi,governing equations of two-phase mixture flow were solved based on state equation for real gas and full cavitation model.According to the special properties of N₂O,numerical simulation was performed on a cavitation Venturi under three experimental states.Two different methods:with and without the influences of latent heat were used respectively and comparison and analysis of two different results were made.The cavitation area calculated by the method considering the influences of latent heat was smaller and obvious change of temperature in and around the cavitation area was found.The results indicate that the necessity and correctness of calculation considering the influences of latent heat,which can be a certain guide for the design of Venturi.