结构参数对文丘里管空化性能影响的数值模拟研究

Numerical Simulation of Effect of Structural Parameters on Cavitation Performance of Venturi Tube

为了达到更好的空化效果,课题组基于FLUENT软件,采用标准κ-ε湍流模型和Schnerr-Sauer空化模型对文丘里管的空化流场进行数值模拟研究。通过对模拟所得的空化云图、蒸气体积分数及空化数进行对比分析,探究了文丘里管的喉径与管径比、入口角度、喉径与喉长比以及出口角度等结构参数对空化效果的影响规律。结果表明:空化效果随着喉径与管径比的增大先增强后减弱,且存在一个最适值;随着入口角度的增大,空化效果减弱;随着喉径与喉长比的增大,空化效应增强;随着出口角度的增大,空化效应减弱。研究结果可应用于文丘里管空化器的优化设计。

In order to achieve a better cavitation effect,the standardκ-εturbulence model and the Schnerr-Sauer cavitation model were used to numerically simulate the cavitation flow fields of Venturi tubes based on FLUENT software.By comparing and analyzing the cavitation contours,vapor volume fraction and cavitation number obtained by simulation,the effects of structural parameters such as throat diameter to pipe diameter ratio,inlet angle,throat diameter to length ratio and outlet angle of Venturi tubes on cavitation were investigated.The results show that the cavitation effect firstly increases and then decreases along with the increase of throat diameter to pipe diameter ratio,and there is an optimum value.With the increase of inlet angle,the cavitation effect is weakened.With the increase of throat diameter to length ratio,the cavitation effect is enhanced.With the increase of outlet angle,the cavitation effect is weakened.The study results provide several references for the optimum design of Venturi tube cavitators.