【作者】 范士杰； 卢炳武； 轧浩； 孔祥瑞；

【Author】 Fan Shijie;Lu Bingwu;Ya Hao;Kong Xiangrui;FAW R&D Center;

【机构】 第一汽车集团公司技术中心；

【摘要】 国家标准对汽车内外噪声提出了明确的限制,而车用冷却风扇是汽车的主要噪声源之一,对车用风扇的气动噪声进行预测分析,对于降低汽车噪声具有重要意义。由于噪声计算的复杂性,国内用CFD方法预测气动噪声尚处于开始阶段。一汽技术中心用三维CFD分析对自由空间中风扇的气动噪声进行了预测分析,采用了如下技术:用大涡模拟计算非定常流场;滑移网格;声学计算采用FW-H模型;并行计算。与试验结果的对比表明,在观测点处计算预测的声压级与试验结果吻合较好,为分析研究风扇等旋转机械的气动噪声提供了有效的手段。更多还原

【Abstract】 The level of vehicle noise was definitely restricted by the national standard.One of the main noise sources is due to the cooling fan in vehicle.Because of the complexity of noise problem,the noise simulation by using CFD methods is just beginning in China.China FAW R&D Center has successfully predicted the noise of fan in free space by using 3D CFD analysis.Some key technique were used in this simulation;LES model for solving unsteady flow,moving mesh for fan’s rotating,FW-H model for acoustic modeling and high performance of parallel processing,etc.Compared with the testing results,the SPL at receivers is predicted rightly.更多还原