三维叶片技术对离心风机流场结构的影响.pdf

学兔Ww. IICTIT11 Com
第50卷第4期
Vo].50No.4
2014年2月
JOURNAL OF MECHANICAL ENGINEERING
2014
DOI:103901/JME,2014.04,178
三维叶片技术对离心风机流场结构的影响
王松涛丁骏姜斌2杜鑫1张龙新
(1.哈尔滨工业大学发动机气体动力研究中心哈尔滨150001;
2.哈尔滨工程大学动力与能源工程学院哈尔滨150001)
摘要:为对离心风机叶轮内流动进行有效控制,应用ぐ叶片和掠叶片的三维十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。兀
弯、前掠、后倾、前掠正弯、后倾正弯叶片能増大吸カ面与前盘之间的端部角区的床力棉度,将端区低能沇体推向主流区,
减少端区低能流体堆积,控制分离;同时,増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。
关键词:离心;风机;弯叶片;掠叶片
中图分类号:TH432
Effect of Three Dimensional Blade Technology on Flow Behavior in
Centrifugal Fan
WANG Songtao DING Jun JIANG Bin DU Xin ZHANG Longxin
(1. Engine Aerodynamics Research Centre, Harbin Institute of Technology, Harbin 15000 E
2. Power Engineering Department, Harbin Engineering University, Harbin 150001)
Abstract: In order to control the air flow in centrifugal fans impellor, three dimensional blade technology of bowed-swept blade is
applied to a certain centrifugal fan. According to the di erence of stacking line in e ircumferential and meridian surface, eight
blades are taken into numerical simulation, including positivc-bowed blade, negative-bowed blade, forward-swept blad
afterward-swept blade, forward-skewed blade, afterward-skewed blade, torward-swept positivc-bowed blade and afterward-skewed
positive-bowed blade. Through the comparison of dif er nt 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 corner between suction surface and shroud, push low energy fluid to
mainstream, reduce low energy fuid 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 corner, reduce the load of blade near the
leading edge, make the point where separation starts move forward and separation scale increase
Key words: centrifuge; fan; bowed-blade: swept-bladc
研究人员将三维叶片造型技术应用于离心风机と
0前言
其中 ZHANG等?的研究团队将三维弯叶片的
造型思想应用于离心叶轮,发现弯叶片可有效提高
自20世纪60年代初,弯曲成形叶片理论被首离心叶轮的増压能力和工作效率。 ENGEDA等?的
次提出至今叫,叶片的三维造刑技术已经逐步成为研究げ队尝试在离心叶轮中应用三维掠叶片的造型
一种较为成熟的优化技术。其一是因为其提高叶轮技术,研究发現后掠使得叶片表面的载荷分布更为
气动性能的能力,其二是因为其作为一种途径使得均匀,但气动性能的提高并不明显。朱土灿等的
入们了解叶栅内二次流动的形成原理。现今,记有岍究团队将三维掠和弯的造型方法同时应用于离心
轮,并学试从叶片表面压力分布的角度分析三维
20130316收到彻稿,20131029收到修改稿
叶片造型技术对离心风机性能的影响,研究并未