摘要
将弯、掠叶片的三维设计技术应用于离心风机叶轮,根据积叠线在周向和子午面内的变化,分别研究正弯、反弯、前掠、后掠、前倾、后倾、前掠正弯和后倾正弯8种叶片。通过比对不同三维设计叶片的整体气动参数、展向的总压损失分布和全周流道不同叶高的相对速度分布云图,研究不同叶片对叶栅流道气动性能和分离流动的影响。数值模拟计算结果显示,后倾、前掠、正弯、前掠正弯和后倾正弯叶片对风机的气动性能起到一定的正面影响,能有效降低叶栅流道前盘端区的总压损失,控制叶轮全周的分离流动;而前倾、后掠和反弯叶片则造成叶片在气动性能上一定程度的恶化,损失沿叶高增加,叶轮全周的流动情况均一定程度恶化。
Three dimensional blade technology of bowed swept blade was applied to centrifugal fan.According to the changes of stacking line in the circumferential and meridian surface,eight blades were taken into numerical simulation,including positive-bowed blade,negative-bowed blade,forward-swept blade,afterward-swept blade,forward-skewed blade,afterward-skewed blade,forward-swept positive-bowed blade and afterward-skewed positive-bowed blade.By comparing the three different dimensional design blades on aerodynamic parameters,distribution of total pressure loss and relative velocity contour map of different height in the impeller,the effects of different kinds of blade on aerodynamic performance was studied.It can be seen from numerical simulation results that positive-bowed blade,forward-swept blade,after-skewed blade,forward-swept positive-bowed blade and afterward-skewed positive-bowed blade have a positive effect on aerodynamic performance of fan which decreasing the total pressure loss of the corner and controlling separation flow.However,negative-bowed blade,afterward-swept blade and forward-skewed blade have a negative effect on aerodynamic performance which increasing the total pressure loss along the spanwise and making the flow field of full annular somewhat deteriorated.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2012年第32期109-115,18,共8页
Proceedings of the CSEE
关键词
离心
风机
弯叶片
掠叶片
气动性能
centrifuge
fan
bowed-blade
swept-blade
aerodynamic performance
