非定常叶顶间隙泄漏流动和换热的数值研究  

NUMERICAL STUDY OF THE UNSTEADY BLADE TIP LEAKAGE FLOW AND HEAT TRANSFER

作　　者：杨佃亮[1] 丰镇平[1] 

机构地区：[1]西安交通大学叶轮机械研究所,陕西西安710049

出　　处：《工程热物理学报》2008年第8期1307-1310,共4页Journal of Engineering Thermophysics

基　　金：国家重点基础研究发展计划资助项目(No.2007CB210107)

摘　　要：通过数值方法研究了带叶顶间隙的某一级半透平中的非定常流动和换热问题。数值模拟采用标准k-w两方程湍流模型,求解非定常雷诺平均N-S方程。动叶顶部间隙取为0.4 mm。分析了动静干涉对动叶顶部间隙内泄漏流动与换热的影响。结果表明,周期性通过的上游静叶尾迹和通道涡是动叶通道中非定常现象的主要来源。流场的波动主要存在于叶顶吸力面侧中间弦长附近。叶顶换热系数波动主要存在于两个位置,一是叶顶吸力面侧,一是叶顶主泄漏通道。叶顶表面面积平均传热系数非定常计算的时均结果与定常计算获得的结果偏差小于2%。A numerical study was performed to simulate the unsteady tip leakage flow and heat transfer in a 1-1/2 axial turbine stage with the flat tip.Results were obtained by solving the unsteady Reynolds averaged N-S equations in conjunction with the low Reynolds number turbulence model.The rotor blade has a flat tip with 0.4 mm tip gap.The effects of the unsteadiness on tip leakage flow and heat transfer were investigated.Results show that the flow unsteadiness in the blade passage is mainly produced by the wake a...

关 键 词：轴流透平 非定常流动 间隙流 顶部换热 

分 类 号：V231.3[航空宇航科学与技术—航空宇航推进理论与工程]