整车气动声学风洞数值模拟

Numerical Simulation of Aerodynamics and Aeroacoustics Wind Tunnel for Whole Vehicle

摘要:

通过实际测量建立气动声学风洞计算域模型，考虑了试验段与外界的联通、脉动压力和瞬态气流交换，以便更好地重现风洞试验段流场的流动特性和非定常特性。将数值模拟结果与风洞实测结果在速度分布、静压梯度、风洞压力平衡口流场、缓冲口流场等具有代表性的流动和压力等特征物理量进行对比分析，结果表明：风洞计算域的数值模拟结果能够较好的贴合风洞的实际流动特征。使用实车模型分别在风洞计算与传统长方体计算域进行数值模拟计算，并与风洞试验结果进行对比分析，结果显示：应用风洞计算域的数值模拟结果更接近风洞试验结果。

Abstract:

In this paper， the simulation domain of the aerodynamics and aeroacoustics wind tunnel is established through actual measurement， taking into account the connection between the test section and the outside world， the fluctuating pressure， and the transient air flow exchange， so as to better reproduce the flow characteristics and unsteady characteristics of the flow field in the test section of the wind tunnel. The comparison between the numerical simulation results and the wind tunnel measurement results in the characteristic physical quantities such as velocity distribution， static pressure gradient， wind tunnel pressure balance outlet， buffer flow outlet and other representative flows and pressures shows that the numerical simulation results in the wind tunnel simulation domain can better fit the actual flow characteristics of the wind tunnel. The real vehicle model is used to conduct numerical simulation in the wind tunnel simulation domain and the traditional cuboid simulation domain respectively， and the results are compared with the wind tunnel test results. The results show that the numerical simulation results in the wind tunnel calculation domain are closer to the wind tunnel test results.