前向离心风机蜗壳出口结构的数值优化  

Numerical Optimization of Volute Outlet Structure for Forward-Curved Centrifugal Fan

作　　者：刘晓良[1] 袁民建[1] 毛义军[1] 祁大同[1] 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《西安交通大学学报》2009年第5期61-65,共5页Journal of Xi'an Jiaotong University

摘　　要：对某前向离心风机内部三维非定常流动进行了数值计算,重点研究了蜗壳出口的3个结构参数——蜗壳出口扩张角、叶轮的露出长度以及蜗舌间隙对风机气动性能及气动噪声的综合影响.通过响应面方法对数值结果进行二次回归拟合,得到3个结构参数与风机效率和A声级间的函数关系,并进行了优化分析.数值结果表明:叶轮露出长度和蜗舌间隙对风机效率和A声级影响较为显著,通过优化能够在保持风机效率基本不变的情况下使A声级降低9.4 dB.将可靠的CFD数值技术与响应面方法结合起来用于指导离心风机的改进及试验设计是可行的.A numerical optimum study on three-dimensional unsteady viscous flow in a centrifugal fan with forward-curved blades was performed. The influence of the outlet angle of the volute, the bare length of the impeller and the cutoff clearance on aerodynamic performance and aerodynamic noise of the centrifugal fan was analyzed concerning the whole impeller-volute configuration. The correlations of the fan efficiency and A-weighted sound pressure level with the three parameters were obtained by quadratic polynomial regression with the response surface methodology （RSM）. The results show that the bare length of the impeller and the cutoff clearance affect the fan efficiency and A-weighted sound pressure level significantly. Moreover, A-weighted sound pressure level decreases by 9.4dB with the three parameters optimized while in this case the fan efficiency only decreases slightly. The method of reliable CFD technique in combination with RSM can be effectively applied to the improvement and experiment design of centrifugal fans.

关 键 词：蜗壳出口结构 气动性能 气动噪声 前向离心风机 响应面方法 

分 类 号：TB53[理学—物理] O355[理学—声学]