摘要
为对离心风机叶轮内流动进行有效控制,应用弯叶片和掠叶片的三维叶片技术于某型离心风机。根据积叠线在周向和在子午面内变化方式的不同,数值模拟正弯、反弯、前掠、后掠、前倾、后倾、前掠正弯、后倾正弯八种三维设计叶片。通过比对不同三维设计叶片的展向和型面的压力分布、吸力面的壁面极限流线,研究不同叶片对叶栅流道流场结构的影响。正弯、前掠、后倾、前掠正弯、后倾正弯叶片能增大吸力面与前盘之间的端部角区的压力梯度,将端区低能流体推向主流区,减少端区低能流体堆积,控制分离;同时,增加叶片近前缘处的叶片负荷,分离尺度减小。反弯、后掠和前倾叶片则作用结果相反,端区低能流体堆积,分离起始点前移,分离尺度增大,近前缘处叶片负荷减小。
In order to control the air flow in centrifugal fan＇s impellor, three dimensional blade technology of bowed - swept blade is applied to a certain centrifugal fan. According to the difference of stacking line in the circumferential and meridian surface, eight blades are 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. Through the comparison of different three dimensional design blades on pressure distribution in spanwise and surface pressure distribution, limiting streamlines on suction surface, the effects of different kinds of blade on flow behavior is studied. Positive-bowed blade, forward-swept blade, after-skewed blade, forward-swept positive-bowed blade and afterward-skewed positive-bowed blade increase the pressure gradient at the comer between suction surface and shroud, push low energy fluid to mainstream, reduce low energy fluid accumulation at the corner, control separation flow. Meanwhile, the cases above increase the load of blade near the leading edge, reduce the probability of separation flow. Negative-bowed blade, afterward-swept blade and forward-skewed blade do it oppositely. They lead to the accumulation of low energy fluid at comer, reduce the load of blade near the leading edge, make the point where separation starts move forward and separation scale increase.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2014年第4期178-184,共7页
Journal of Mechanical Engineering
关键词
离心
风机
弯叶片
掠叶片
centrifuge
faro bowed-blade
swept-blade
