离心风机三元叶轮优化设计及实验研究

An Optimum Design and Experimental Study for 3D Impeller of Centrifugal Fan

本文以两族相对流面的三元流动通用理论为基础,论述了流线曲率法在离心风机三元设计中的应用,同时依据离心叶轮的进、出口流动状态,子午面压力平衡原则,回转面叶片加载规律,详细论述了离心叶轮的几何参数优化准则,子午面和回转面通道的成型准则。对5-29№5.5离心通风机叶轮进行了三元优化设计,并和原一元风机一起进行了实验研究,结果表明,三元风机效率比一元风机平均提高5％,高效工况范围(>80％)拓宽近30％。

Based on the general three dimensional flow theory with two relative stream surface , the application of method of streamline curvature in three dimensional design of centrifugal fun is discussed in this paper. Meanwhile, according to the inlet and outlet flow state of centrifugal impeller,the balance of pressure in hub-to-shroud surface,and the change of load on blades of blade-to-blade,the optimum criteria of geometric parameter of centrifugal impeller and that of geometry of hub-to-shroud and blade-to-blade path are expounded. Three dimensional optimum design for a centrifugal fan with 5-29№55. 5 impeller and its experimental study are carried out along with original one-dimensional fan . The experimental results show that the efficiency of three dimensional fan increases by an average of 5% and high efficiency range(>80%) widens about 30% over one dimensional fan.