汽车动力总成冷却风扇优化设计

Optimization Design of Automotive Powertrain Cooling Fans

某汽车动力总成冷却风扇风量较低,辐射气动噪声较大,不满足设计要求,对该风扇进行改进优化设计,并对改进前后的风扇在试验台架上进行气动性能测试对比,在整车上进行车内外噪声测试对比,测试结果表明,改进后风扇在3000 r/min时,标准风量由1823.9 m^3/h增大到2375.7 m^3/h,增大30.3%,静压效率无明显变化,功率略增大,改进后扇叶叶片旋转噪声的1阶和2阶明显降低,在2600 r/min转速下,总声压级从70.41 dB(A)降低到66.31 dB(A),降低4.1 dB(A),扇叶叶片1阶声压级从67.87 dB(A)降低到56.91 dB(A),降低10.96 dB(A)。

The automobile powertrain cooling fan of a car had lower air volume flow and larger aerodynamic noise,which could not meet the design requirements.Therefore,the fan performance was improved by optimization design.Then,the aerodynamic performances of the fan were tested in the laboratory and the internal and external aerodynamic noises of the whole vehicle were tested before and after the improvement.The test results were analyzed and mutually compared.It was shown that the air volume flow increased from 1823.9 m^3/h to 2375.7 m^3/h at the speed of 3000 r/min;the static pressure efficiency did not change essentially;the power increased slightly,the sound pressure levels of the fan blade rotating noises of order 1 and order 2 were reduced obviously,the overall sound pressure level decreased from 70.41 dB(A)to 66.31 dB(A)and the first order sound pressure level of the fan blade decreased from 67.87 dB(A)to 56.91 dB(A)at the speed of 2600 r/min.