缩比模型轮胎转速对整车风阻影响分析

Analysis of Influence of Wheel Rotation Rate on Wind Drag in RSWT

摘要:

在缩比模型风洞试验中，若车轮转速设置与气体来流相同，会使轮胎旋转角速度倍增，导致缩比模型设计难度增大，同时试验中的不稳定因素也会增加，因此需要对缩比模型风洞试验中轮胎转速对风阻的影响进行分析，以探究轮胎降转速试验的可行性。本文基于某MPV车型，通过风洞试验及计算流体动力学（CFD）仿真方法对轮胎转速对整车风阻的影响进行分析，结果表明：轮胎转速对风阻测试结果有影响；缩比模型车轮速度设定与来流相同时，缩比模型与全尺寸风阻结果更一致。

Abstract:

In reduces scaled wind tunnel （RSWT） tests， if the wheel speed is set to the same as the wind， it will double the tire rotation angular velocity， making it more difficult to design a scaled model. At the same time， it will cause a greater instability. Therefore， it is necessary to analyze the effect of tire speed on wind resistance in RSWT tests to explore the feasibility of tire speed reduction tests. Based on a MPV， the influence of wheel rotation speed is analyzed using wind tunnel test and the computational fluid dynamics （CFD） method. The result shows that the tire speed has an impact on the wind resistance test results. The wheel speed setting of the scaled model is the same as the incoming flow， and the scaled model is more consistent with the full-scale wind resistance results.