In order to improve the aerodynamic noise of an automotive annular cooling fan,the blade structure of an annular cooling fan was taken as the research object,and the influence of blade perforation numbers on the aerodynamic and noise performance of automotive annular cooling fans was studied using numerical simulation methods.Firstly,the aerodynamic and noise performance calculation model of the cooling fan was established,and the large eddy simulation and the Ffowcs Williams and Hawkings(FW-H)equation were used to simulate and verify the calculation results.Then,the blade perforation positioning method was designed,and three perforation models were obtained and their aerodynamic and noise performance were simulated and calculated.Finally,the flow and sound fields of the original fan model and the blade perforation model were analyzed,the influence of different perforation numbers on the performance of annular cooling fan was obtained by analyzing the calculation results.The research results show that the perforated structure can effectively reduce the discrete frequency noise and total sound pressure level of the annular cooling fan,and the model B has the best effect,which is 4 dB lower than the A-weighted total sound pressure level of the original fan model.Air volume and static pressure efficiency decrease with the increase of the number of perforations.By analyzing the flow field and sound field distribution of the annular cooling fan,it can be seen that the perforated structure can effectively reduce the generation of the low-speed recirculation zone at the tip of the blade,and inhibit the vortex shedding of the blade to a certain extent,thereby reducing the noise of the perforated structure fan.It can provide a new idea for the performance optimization design of the subsequent automotive annular cooling fan.
关键词
环形冷却风扇/穿孔结构/数值模拟/离散噪声/涡流噪声/福克斯·威廉姆斯和霍金斯方程
Key words
annular cooling fan/perforated structure/numerical simulation/discrete noise/eddy current noise/Ffowcs Williams and Hawkings(FW-H)equation
维普
万方数据