采用锯齿结构的车辆冷却风扇降噪研究

Research on noise reduction of vehicle cooling fan with sawtooth structure

为降低冷却风扇的气动噪声并保证其气动性能不下降,参照试验,建立冷却风扇流场和声场的计算模型,通过计算流体力学(CFD)/计算气动声学(CAA)联合仿真方法,对风扇的气动性能和气动噪声性能进行仿真预测。将带有不等高、角度倾斜特征的叶片后缘锯齿结构引入冷却风扇结构设计中,进行参数化建模,结合正交试验研究了各参数对风扇风量以及噪声值的影响程度及影响趋势。结合响应曲面法(RSM),得到了叶片后缘锯齿结构优化方案,优化后的风扇模型气动噪声性能和气动性能都有改善,为车辆冷却风扇的参数设计提供了新的思路。

In order to reduce the aerodynamic noise of the cooling fan and maintain its aerodynamic performance,the computational model of the flow field and sound field of the cooling fan are established according to the experiment,and the aerodynamic performance and aerodynamic noise performance of the fan are predicted by the computational fluid dynamics/computational aeroacoustics joint simulation method.Secondly,the sawtooth structure of blade trailing edge with the characteristics of unequal height and inclined angle is introduced into the structural design of the cooling fan,and the parametric modeling is carried out.Combined with the orthogonal test,the influence degree and trend of each parameter on air volume and noise value are studied.Finally,combined with the response surface methodology,the optimization scheme of sawtooth structure of blade trailing edge is obtained.The aerodynamic noise performance and aerodynamic performance of the optimized fan model are improved,which provides a new idea for parameter design and noise reduction research of vehicle cooling fan.