【摘要】 针对一款应用在汽车空调上的多翼离心风机的噪音问题进行分析。利用Strar CCM+软件对常规直蜗舌和加斜蜗舌后的多翼离心风机进行数值模拟研究。计算结果表明：斜蜗舌对蜗舌附近及蜗舌后的流场都有较大的影响，好的倾斜蜗舌设计可以改善蜗舌处的流场，减小蜗舌区域的旋涡强度。对多翼离心风机加装倾斜蜗舌前后风量和噪音变化进行试验，结果表明：在相同转速下，风量基本没有变化，斜蜗舌对总噪声值改善较小，但可以明显改善叶轮阶次噪声，叶轮阶次频率处噪声降低了7dB左右。更多还原

【Abstract】 In this paper, a multi-blade blower of the automobile air conditioning is taken as the object of study; the three-dimensional numerical simulation on the straight volute tongue and the inclined volute tongue in multi-blade centrifugal blower is conducted with Star CCM+. The simulation result shows that the inclined volute tongue has significant impact on the flow field near and after the volute tongue; a good design for the inclined volute tongue can improve the flow field in the tongue and reduce the vortex intensity in the tongue area. The volume and noise of multi-blade centrifugal blower before and after appling the inclined volute tongue are tested. The results show that in the case of the same speed, the blowing rate and the total noise of the air conditioning is almost the same; however, the impeller order noise can be significantly improved, and the noise at the impeller order frequency is reduced by about 7dB.更多还原