三种空穴模型在可调汽蚀文氏管数值模拟中的对比研究

Comparative Investigation among Three Cavitation Models for Simulating Cavitating Venturi

采用Singhal et al,Zwart-Gerber-Belamri,Schnerr and Sauer三种空穴模型,结合Mixture多相流模型,对不同开度下的可调汽蚀文氏管进行了数值模拟,并将计算结果与试验数据进行了对比分析,讨论了计算模型的适应性。研究结果表明三种数值模型均能模拟可调汽蚀文氏管的内部流场,计算结果与试验结果具有较好的一致性且随着开度的增大计算精度提高。相比较而言,Zwart-Gerber-Belamri空穴模型计算精度较高,收敛速度较快,而且能够捕捉到相变过程中的温度变化,是一种较为实用的可调汽蚀文氏管的数值计算模型。

Numerical models based on the mixture model, Zwart-Gerber-Belamri model, and Schnerr muhiphase model and three different cavitation models （Singhal and Sauer model） were investigated to simulate cavitating venturi with different throttle distances. Meanwhile, the adaptability of each of three models was discussed in terms of ac- curacy and efficiency. Results show that the three numerical models are suitable for simulating the cavitating ventu- ri. In addition, calculated results agree with test data and the relative error decreases with increasing throttle dis- tance. Compared with the other two cavitation models, the Zwart-Gerber-Belamri model relatively has higher preci- sion, consumes less running time, and indicates the temperature distribution in the flow field; thus ZGB model is best for simulating cavitating venturi.