流体机械

2010, v.38;No.456(06) 6-10

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轴流前弯叶轮叶顶流场特征分析
Characteristic of Tip Flow Field of Axial Fan with Forward-skewed Rotor Blade

卢纪富;魏新利;李杨;
LU Ji-fu1,WEI Xin-li1,LI Yang2 (1.Zhengzhou University,Zhengzhou 450001,China;2.Qingdao Science and Technology University,Qingdao 266061,China)

摘要(Abstract):

针对不同化工用前弯叶片的轴流通风机,在额定工况处数值模拟了三维粘性流场以及利用粒子图像测速仪PIV试验测量了叶顶流场。在数值结果与测量结果相吻合的前提下,分析了叶轮近上端壁面极限流线、叶顶轴向速度大小分布以及不同前弯角度叶片对叶顶泄漏流在发展阶段的影响。结果展示了叶顶流场的基本特征-叶顶泄漏涡的初始段和发展段;揭示了叶顶泄漏涡是叶顶流动阻塞的最主要原因之一;叶片前弯角度与叶顶泄漏涡稳定度之间的非线性变化;在泄漏涡发展阶段,涡度随叶片前弯角度之间"先增强后减弱"的变化规律。
Base on axial fans with different forward-skewed rotor blades,the three-dimensional viscous flow fields were simulated in the design condition and blade tip flow field was measured by particle image velocimetry(PIV).The computational results agree well with the experimental data.In tip flow field distribution of limiting streamline on upper endwall and axial velocity on blade to blade surface were analyzed.Effect of blade forward skew angle on tip leakage flow in developing section are studied.One of the basic characteristics-blade tip leakage vortex in initial and developing sections is showed.The results are revealed tip leakage vortex is one of the most important factors of flow blockage in blade tip passage.Tip leakage vortex stability is nonlinear with increase of blade forward skew angle.In developing section,tip leakage vortex vorticity is first increased and then reduced with increase of blade forward skew angle.

关键词(KeyWords): 轴流通风机;前弯叶片;叶顶流场;涡量
axial fan;forward-skewed rotor blade;tip flow field;vorticity

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作者(Author): 卢纪富;魏新利;李杨;
LU Ji-fu1,WEI Xin-li1,LI Yang2 (1.Zhengzhou University,Zhengzhou 450001,China;2.Qingdao Science and Technology University,Qingdao 266061,China)

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