叶片与蜗舌耦合对离心风机性能和旋转噪声影响的数值研究  

Effect of Interaction between Centrifugal Impeller and Volute Tongue on the Performance and BPF Noise

作　　者：毛义军[1] 祁大同[1] 徐长棱[1] 刘秋洪[1] 

机构地区：[1]西安交通大学,西安710049

出　　处：《应用力学学报》2006年第3期368-372,共5页Chinese Journal of Applied Mechanics

摘　　要：利用三维N-S方程和RNGk-ε湍流模型对离心风机内部的非定常粘性流场进行了数值模拟,分析了不同时刻叶片与蜗舌所处的不同相对位置对风机瞬时性能、叶轮出口流动以及对蜗舌处的静压分布和静压脉动的影响。同时指出,改进特定时刻叶片与蜗舌处于特定相对位置时风机的瞬时性能是提高风机总体性能的一条新的途径。此外,还尝试运用一种新的方法,即不用求解声场而直接依据非定常流场中的静压脉动分析了蜗舌处主要气动噪声源的位置及其成因。The three-dimensional unsteady flow field in a centrifugal fan is numerically simulated,where Navier-Stockes equations are adopted and RNG k-epsilon turbulence model is chosen. The detailed analysis of instantaneous total pressure coefficient,power coefficient and efficiency in a given operating mode is presented. The result shows that the instantaneous values of total pressure coefficient and efficiency highly depend on the location of the blades,yet the power coefficient is almost invariable. And the time-domain analysis and frequency-domain analysis to the fluctuating components of static pressure indicate that some parts of volute tongue are the dominant blade passing frequency (BPF) noise sources.

关 键 词：离心风机 非定常流场 旋转噪声 风机性能 

分 类 号：O357.1[理学—流体力学]