发动机冷却风扇气动噪声研究及仿生学改进

Study on Aerodynamic Noise of Radiator Fan and Improvement of Bionics

基于SST k-ω分离涡模型的数值模拟,以及鲨鱼背鳍的仿生学研究,设计了一种风扇叶片,以期减少风扇的气动噪声。在风扇噪声试验验证数值模拟准确性的基础上,应用CATIA和STRA CCM+,通过参数化设计,同时采用正交试验法进行优化方案的选择。结果表明:基于仿生鲨鱼背鳍结构的方案设计,能够减小风扇后缘的气流分离,抑制尾缘区域湍流涡的形成,改善了尾缘区域的流场,有效的降低了气动噪声,优化后的单品风扇叶片的气动噪声比原始方案减小了3.64 dB。

Based on the numerical simulation of the SST k-ωseparating vortex model and the bionic study of the shark dorsal fin,a fan blade was designed to reduce the aerodynamic noise of the fan.On the basis of the fan noise test to verify the accuracy of the numerical simulation,CATIA and STRA CCM+are applied,and the optimization scheme is selected through the parameterized design and the orthogonal experiment method.The results show that the design based on the bionic shark dorsal fin structure can reduce the airflow separation at the trailing edge of the fan,and suppress the formation of turbulent vortices in the trailing edge area,and improve the flow field,and effectively reduce aerodynamic noise,and optimize the aerodynamics of the fan blades.The noise is reduced by 3.64 dB comparing with the original scheme.