【摘要】 为减小Zwart-Gerbera-Belamri空化模型中经验参数取值对数值模拟结果的影响,基于当地流动特征修正了Zwart-Gerbera-Belamri空化模型.联立Realizable k-ε湍流模型,分别采用修正前后的Zwart-Gerbera-Belamri空化模型对二维NACA0009 MOD水翼空化流场进行了数值模拟,空化数范围为0.75～0.90.并采用修正前后的Zwart-Gerbera-Belamri空化模型对二维Clark-Y水翼的初生空化、片状空化、云空化进行非定常数值模拟,空化数范围为3.00～0.55.将数值模拟结果与已有实验结果进行对比,结果表明:引入当地流动特征可以有效减小Zwart-Gerbera-Belamri空化模型中的气泡半径及气核体积分数的取值对数值模拟结果的影响,且修正后的空化模型能够捕捉不同空化数下绕Clark-Y翼型的时均升阻力系数的变化趋势.更多还原

【Abstract】 In order to reduce the influence of empirical parameters in the Zwart-Gerbera-Belamri cavitation model on numerical simulation results, the Zwart-Gerbera-Belamri cavitation model was modified based on local flow properties. Choosing the realizable k-ε turbulence model, the cavitation flows over 2 D NACA0009 MOD hydrofoil were numerically simulated by using the original and modified Zwart-Gerbera-Belamri cavitation model, and the cavitation number ranged from 0.75 to 0.90. The unsteady incipient cavitation, sheet cavitation and cloud cavitation events of 2 D Clark-Y hydrofoil were also simulated by the modified and original cavitation model. The cavitation number ranged from 3.00 to 0.55. Comparing the numerical simulation results with existing experimental data, the results show that introducing local flow properties can effectively reduce the influence of the parameters in the Zwart-Gerbera-Belamri cavitation model on numerical simulation results, such as the bubble radius and nuclei volume fraction; the modified cavitation model can predict the time-averaged lift and drag coefficients of the Clark-Y hydrofoil with different cavitation numbers.更多还原