抑制叶顶间隙泄漏的叶轮机械叶片的流场模拟  

Flow Field Simulation of Turbomachine Blades with Their Tip Clearance Leakage Being Suppressed

作　　者：毛佳妮[1] 曹紫胤[2] 

机构地区：[1]华中科技大学能源与动力工程学院,湖北武汉430074 [2]上海大学应用数学和力学研究所,上海200072

出　　处：《热能动力工程》2009年第2期154-157,共4页Journal of Engineering for Thermal Energy and Power

摘　　要：根据叶顶间隙流对叶轮机械的性能有重要影响这一特性,设计了一种叶片。该叶片顶部带有"燕尾冠",在叶顶的压力侧和吸力侧都形成"倒钩"。通过对带有"燕尾冠"的叶片和一般的叶片的流场进行数值模拟,在同等条件下比较两者之间压气机的总体性能、流场特性以及叶顶间隙的泄漏量的区别,得到优化设计后的"燕尾冠"叶片能较好的保持住叶片表面的压力,削弱了叶顶间隙泄漏涡的产生和减少了通过叶顶间隙的泄漏量。数据结论为改进和提高叶轮机械的运转性能提供参考依据。With the growth of national economy,turbomachines are widely used in industrial and mining enterprises.In the light of the special feature of a major influence as exercised by blade-tip clearance stream on turbomachine performance,designed was a new type of blades.The blades in question are provided with a 'dovetail crown' at the blade tip,forming a 'barb' at both the pressure and suction side of the blade tip.Through a numerical simulation of the flow fields in the blades and other ordinary blades,compared was the difference of the overall performance,flow field characteristics and blade-tip clearance leakage of a compressor between the above two kinds of blades under equivalent conditions.The authors concluded that the 'dovetail crown' shaped blades thus optimized and designed can relatively well maintain the pressure on the blade surfaces,reduce the possibility that a leakage vortex occurs at blade tips and diminish the leakage from the blade tip clearance.The data and relevant conclusions thus obtained can provide a helpful reference and basis for improving and raising the operating performance of turbomachines.

关 键 词：叶轮机械 “燕尾冠”型叶片 数值模拟 叶顶间隙流 泄漏涡 

分 类 号：TK474.8[动力工程及工程热物理—动力机械及工程]