板式无蜗壳离心风机内部流动分析及分流叶片影响  

The Influence of Splitter Blades on the Performance of Voluteless Centrifugal Fan

作　　者：马寅辉 张一帆 窦华书[1] 叶信学 曹文斌 陈永宁 Yin-hui Ma;Yi-fan Zhang;Hua-shu Dou;Xin-xue Ye;Wen-bin Cao;Yong-ning Chen(Faculty of Mechanical Engineering and Automation,Zhejiang Sci-Tech University,Hangzhou China;Zhejiang Yilida Ventilator Co., Ltd.,Taizhou China)

机构地区：[1]浙江理工大学机械与自动控制学院 [2]浙江亿利达风机股份有限公司

出　　处：《风机技术》2019年第2期32-42,共11页Chinese Journal of Turbomachinery

基　　金：国家自然科学基金(51536008,51579224);浙江省重点研发计划(2018C03046);浙江省科技计划(2017C34007)

摘　　要：本文采用一种分流叶片结构提高无蜗壳后向离心风机出口静压及效率,来改善风机的性能,达到设计目的。研究表明,无蜗壳离心风机的损失在低流量工况下主要由叶片吸力面分离涡导致,在高流量工况下主要由二次流等因素引起。通过研究不同长度系数的分流叶片对风机内部流动的影响,发现分流叶片长度为叶片长度的一半,在整个流量范围内,均能达到减少分离涡和抑制二次流的效果,使得低流量和高流量下的静压效率均有大幅提高。A type of split-blade structure is adopted to increase the static pressure at the outlet of impeller and efficiency which is the key index to improve the performance of centrifugal voluteless fan. Studies have shown that the losses is caused by vortex separation on blade suction surface at low flow conditions, and secondary flow in the channel at high flow conditions. To explore the influence on internal flow, different length coefficient splitter blades have been employed. The results show that, in the entire flow range, separation vortices are reduced and secondary flows are suppressed by using splitter blades when the length of splitter blades is the half of the main blade length. The static pressure efficiency at both low flow rate and high flow rate has been greatly improved with splitter blades.

关 键 词：无蜗壳风机 数值计算 分流叶片 二次流 分离涡 

分 类 号：TH432[机械工程—机械制造及自动化] TK05[动力工程及工程热物理]