旋转孤立车轮局部流场的影响评价

Influence of Rotating Wheels on Isolated Wheel Aerodynamics

摘要:

以简单孤立车轮为研究对象，在静止和旋转工况下，对有侧偏角和无侧偏角时车轮周围的流场结构进行数值分析和试验验证.计算采用定常雷诺时均NavierStokes方程，试验在1∶15的模型风洞中进行.不同工况下车轮周围流场、表面压力系数、气动阻力系数和升力系数等数据的分析结果表明，车轮的旋转会对流场产生巨大影响.车轮旋转使总体压差减小，气动阻力和气动升力下降，气动性能得到改善.

Abstract:

To make a research on flow characteristics around wheel, simplified isolated wheel is applied under different conditions including stationary and rotation with different yaw angles by computational simulation, which is validated by experiments. Particularly, steady Reynolds Averaged Navier Stokes (RNS) calculation is adopted in simulation in combination with experiment in a scaled wind tunnel of 1:15. Further, detailed analyses on local flow, surface pressure coefficient, drag coefficient and lift coefficient of wheel in different conditions figure out that rotating wheel affects the flow around the isolated wheel significantly. Pressure difference, drag coefficient and lift coefficient are decreased by the rotation, which improves aerodynamic performance.