【作者】 赵超； 李晓东；

【Author】 ZHAO Chao;LI Xiao-dong;School of Jet Propulsion,Beihang University;

【机构】 北京航空航天大学能源与动力工程学院；

【摘要】 采用脱体涡模拟与三维的Ffowcs Williams&Hawkings(FW-H)方程匹配的混合方法,数值研究高雷诺数下串列圆柱的流场与辐射声场。首先采用不同湍流模型的脱体涡模拟方法数值模拟串列圆柱近声场的非定常流动,结果表明,基于SST-kω湍流模型的脱体涡模拟方法能较好的模拟串列圆柱的流动特性,其近场非定常流动和平均流场都能与实验结果较好吻合。然后,以脱体涡模拟的近声场为基础,通过求解可穿透积分面的FW-H方程时域公式获得远声场信息,远场频谱特性与实验结果吻合较好。研究显示了脱体涡模拟与FW-H积分混合方法预测多钝体绕流气动噪声的精度与可行性。更多还原

【Abstract】 This paper investigates a hybridnumerical method via matching the 3D FW-H equation with the Detached Eddy Simulation(DES),to predict the sound field radiated by tandem cylinders at a high Reynolds number.Firstly,the unsteadynear sound field of tandem cylinders is simulated by DES method with different turbulence models.Numerical results show thatthe DES based on SST-kω model can resolve the flow properties of the tandem cylinders rather accurately.Both the mean flow and the unsteady flowagree well with experimental data.Then,the far sound field is predicted by solving a time-domain FW-H equation formula through a penetrable integration surface with the near field flow information as input.The predicted far sound field spectrum are in good agreement with the experimental results.This demonstrates the accuracy and feasibility of the DES and FW-H matching methodfor the prediction of aerodynamic noise from multi bluff body flows.更多还原