合成射流模型在汽车流动控制仿真中的应用  

Application of Synthetic Jet Models to the Simulation on Vehicle Flow Control

作　　者：崔文诗[1] 杨志刚[1] 朱晖[1] 

机构地区：[1]同济大学,上海地面交通风洞中心,上海201804

出　　处：《汽车工程》2016年第11期1331-1337,共7页Automotive Engineering

基　　金：国家973计划项目(2011CB711203)资助

摘　　要：针对采用边界条件模型进行基于合成射流的汽车流动控制仿真精度较低的问题,建立了全尺寸和单出口喉部的两种三维仿真控制模型。通过大涡模拟研究了合成射流与车辆外流的交互作用。结果表明:在不同工况下,边界条件模型预测的平均流场和气动力变化趋势与实验结果接近,而全尺寸和单出口喉部模型的预测精度较高。3种模型出口喉部内非定常流场的差异造成射流出口速度的不同,最终导致平均流场和气动力的差异。In view of the low accuracy of simulation on the synthetic jet-based flow control of vehicle using boundary condition model,two 3D models of full-cavity and slot-only are established and the interaction between synthetic jets and the exterior flow around vehicle is studied by large-eddy simulation. The results indicate that under different conditions the varying trends of average flow field and aerodynamic forces with boundary condition model are close to that of experiment,while the prediction accuracies with both full-cavity and slot-only models are higher. The difference of unsteady flow field inside the slot in three different models results in the different velocities at jet exit,which in turn leads to the discrepancy in average flow field and aerodynamic forces.

关 键 词：车辆 合成射流 流动控制 大涡模拟 

分 类 号：U461.1[机械工程—车辆工程]