Effects of rotor structure on performance of small size axial flow fans  

作　　者：Pin Liu Yingzi Jin Yanping Wang 

机构地区：[1]Laboratory of Fluid Transmission and Application, Zhejiang Sci-Tech University, Hangzhou, 310018, China

出　　处：《Journal of Thermal Science》2011年第3期205-210,共6页热科学学报（英文版）

基　　金：The author acknowledges the support of Zhejiang Provincial Natural Science Foundation (No.R107635);Zhejiang Provincial Key Science Foundation (2008 C11027);National Natural Science Foundation of China (No.50735004)

摘　　要：Small size axial flow fans are used as a cooling component for computers,electronic equipment and other electronic components.With the increasing power of electrical equipment,the demand for lower noise and higher ventilation of cooling fan is also increasing.Traditional methods of improving ventilation by raising the fan's rotation speed causes a decrease in efficiency and an increase in noise.In this paper,different structures of fans were simulated,and as a result,the counter-rotating fan can achieve higher pressure,efficiency and facilitate ventilation in a smaller space.Furthermore,some other conclusions are as follows:(1) Higher pressure rise can be obtained by a counter-rotating fan than by the two-stage rotor fan in the same axial length.Meanwhile,the counter-rotating fan has a broader work scope.(2) The main noise type of the counter-rotating fan is rotating noise;the small peak pulse caused by vortex noise mainly due to the eddy current produced by small eddies.(3) When the distance of counter-rotating fans is smaller than 2 times the chord,the greater distance the greater total pressure of the circum-averages and along the axial direction,the total pressure begin to decline until the distance is three times the chord,so there is an optimal distance between rotors.The simulation results are of important significance to the quantitative analysis and optimization design of the counter-rotating fan.

关 键 词：axial flow fan COUNTER-ROTATING eddy current noise 

分 类 号：TP332[自动化与计算机技术—计算机系统结构] TM351[自动化与计算机技术—计算机科学与技术]