杨振东 谷正气 谢超 宗轶琦 汪怡平 江财茂

摘 要：开槽扰流器能有效地降低汽车天窗开启的风振噪声.为了更好地理解其降噪机理，构建了开槽扰流器和平直扰流器风洞试验平台，通过风洞试验来调查扰流器有无开槽对其后方壁面压力场的影响.试验结果表明，相比于平直扰流器，扰流器的开槽能够将流动再附着点提前，减少了气流的再循环区域， 开槽扰流器下游流动存在初始的展向相位差，降低了壁面压力展向上的相干性，导致壁面压力在展向上具有较大的衰退性.因此开槽扰流器，对下游流动的扰动效果非常明显，能够弱化对乘员舱的激励.

关键词：风振噪声；开槽扰流器；降噪机理；风洞试验

中图分类号： U461.4 文献标志码：A

Abstract：A groove spoiler can effectively reduce vehicle sunroof buffeting noise. In order to have a better understanding of sunroof buffeting noise reduction mechanism associated with groove spoilers， a test platform of groove and uniform spoiler was built. Wind tunnel experiments were performed to investigate the surface pressure field downstream of uniform and grooved spoilers and to observe the effects of the grooves on the wall pressure. The test results show that the presence of grooves in the spoiler moves the reattachment point upstream and reduces the recirculation region length. Compared with the uniform spoiler， an initial spanwise phase difference was observed behind the spoiler in the presence of the groove， which decreased the coherence of the wall pressure， and the wall pressure had a big decay rate in the spanwise direction. Grooves in the spoiler can obviously disturb the downstream flow， and thus it can weaken the primary aerodynamic excitation for the vehicle cabin.

Key words：wind buffeting noise； grooved spoiler； noise reduction mechanism；wind tunnel experiment

随着车辆实用速度的不断提高以及机械噪声（如发动机噪声、传动噪声等）得到大量研究与较好的有效控制，气动噪声问题已日益凸显，得到国内外大量学者的关注，尤其是汽车风振噪声的研究.风振噪声具有强度高而频率较低的特征，会使车内乘员产生极为强烈的不适感，直接影响乘坐舒适性，而长时间的风振噪声会对乘员的身心产生影响进而导致行驶安全性的隐患.研究汽车风振噪声的特性，并对其进行有效的控制，从而提高汽车乘坐的舒适性具有很重要的意义.

早在1965年，美国福特公司的工程师Bodger和Jones率先开展了汽车侧窗开启时的风振噪声研究[1]，发现大多数汽车在开启一个或一个以上……