湍流模型对风琴管喷嘴空化射流数值模拟的影响分析

Impact Analysis of Turbulence Models on Numerical Simulation of Cavitating Jet from Organ Pipe Nozzle

针对不同湍流模型对空化射流流场数值模拟影响问题,基于ZGB(Zwart-Gerber-Belamri)空化模型和WALE(wavelet analysis of Lagrangian errors)亚格子模型,采用大涡模拟(large eddy simulation,LES)和RANS(Reynolds-averaged Navier-Stokes)模型对风琴管喷嘴空化射流流场进行数值模拟研究,分析内外流场的压力分布、速度分布以及空化云演变规律,并将空化云演变规律与实验结果进行对比分析。结果表明,LES模型速度、压力分布更符合实际情况,空化云演变规律与高速摄像拍摄结果基本吻合,LES模型可以更准确地模拟风琴管喷嘴空化射流流场,对风琴管喷嘴结构优化、打击力度与目标靶距的预测更准确。

In view of the influence of different turbulence models on the flow characteristics of cavitating jet flow field,based on the ZGB(Zwart-Gerber-Belamri)cavitation model and the WALE(wavelet analysis of Lagrangian errors)sub-grid model,the large eddy simulation(LES)and RANS(Reynolds-averaged Navier-Stokes)models were used to carry out numerical simulation research on the cavitating jet flow field of the organ tube nozzle,analyze the pressure distribution,velocity distribution and the evolution law of the cavitating cloud of the internal and external flow fields,and compare the evolution law of the cavitating cloud with the experimental results.The results show that the velocity and pressure distribution of LES model are more in line with the actual situation,and the evolution law of cavitation cloud is basically consistent with the results of high-speed photography.The LES model can more accurately simulate the cavitation water jet flow field of the organ nozzle.