【摘要】 通过仿真和风洞试验方法，总结汽车轮辋开口比在车轮旋转工况下对整车风阻的影响规律，并给出产品开发中的轮辋开口比建议值，分析车轮通风阻力矩与整车风阻系数关联性，从而分析车轮旋转降低风阻系数机理。分析结果表明：（1）车轮旋转工况的仿真方法采用旋转壁面法具有可信性；（2）车轮旋转工况下，开口比越小对降低整车风阻越有利，同时会增大旋转工况下整车风阻系数降低量；（3）车轮通风阻力矩影响量越大，越有利于旋转工况下降低整车风阻系数。更多还原

【Abstract】 Through numerical simulation and wind tunnel test, the influence of the rim opening ratio on the wind resistance of the vehicle under the wheel rotation condition is analyzed, and the recommended value of the rim opening ratio in design and development is given. Meanwhile, the correlation between the moment of ventilation resistance and the vehicle wind resistance is analyzed, and then the mechanism of wheel rotation drag reduction is analyzed. Analysis conclusions can be as following:(1) The simulation method of wheel rotation condition is credible by using the rotating wall method;(2) Under the wheel rotation condition, the smaller the opening ratio is more favorable for the vehicle wind drag reduction, and the difference of the vehicle wind drag coefficient between the rotating condition and the stationary condition will be reduced;(3) The greater the wheel ventilation resistance torque, the more conducive it is to reduce the wind resistance coefficient of the whole vehicle under rotation conditions.更多还原