某带附加台架汽车模型风洞试验精度验证

Test Accuracy Verification for a Vehicle Model Wind Tunnel with Added Rig

设计了一种简便的用于汽车模型风洞高速试验段的试验台架,用步进电机控制台架地板正反转以模拟不同横摆角工况,抬高的台架地板能有效消除风洞地板边界层的影响。利用计算流体动力学软件建立了数学模型,计算和分析了台架地板直径对气动力的影响规律及不同风速和横摆角工况下的气动特性,计算结果与风洞试验结果吻合较好,气动力误差在8%以内。研究结果表明,该风洞台架试验精度达到工程要求,对汽车模型风洞试验方案设计具有一定的参考意义。

A handy test rig for use in the high speed section of vehicle model wind tunnel is designed. The floor of test rig is driven by stepping motor to rotate for simulating the conditions of different yaw angles,and its raised position can effectively eliminate the effects of the ground boundary layer of wind tunnel. A mathematical model for the test rig is established with computational fluid dynamics software to calculate and analyze the influencing law of the diameter of rig floor on aerodynamic forces and the aerodynamic characteristics of model under different wind velocities and yaw angles. The results of calculation well agree with that of wind tunnel test,with an error of aerodynamic forces within 8%. The results of study show that the accuracy of wind tunnel test with added test rig attains engineering requirements,having certain reference significance for the design of test scheme for vehicle model wind tunnel.