考虑叶顶泄漏的透平级非定常气动性能研究  

Study on Unsteady Aerodynamic Performance of Turbine Stage Considering Tip Leakage Flow

作　　者：李少军[1] 李军[2] 龚存忠[1] 丰镇平[2] 

机构地区：[1]中船重工第704研究所,上海200031 [2]西安交通大学叶轮机械研究所,西安710049

出　　处：《动力工程学报》2011年第11期823-829,共7页Journal of Chinese Society of Power Engineering

基　　金：国家重点基础研究计划(937计划)资助项目(2007CB707705)

摘　　要：针对存在动叶顶部间隙泄漏流的一级半透平级非定常流场,应用全三维黏性非定常数值模拟方法详细研究了动叶顶部间隙泄漏流气动特性,旨在揭示泄漏流与下游静叶栅的非定常干涉作用.结果表明:动叶顶部间隙泄漏流引发第二列静叶前缘85%叶展位置处静压波动;受相邻叶排间势干涉作用,第二列静叶50%叶展位置处的静压波动集中于流道中部;在第二列静叶出口截面,动叶顶部泄漏流引发的泄漏涡,其强度及空间分布并未随时间发生明显变化;汽封内的泄漏流静压随时间周期性波动,压力值的更新首先出现于下游并朝向上游流发展.The unsteady flow field of one and half turbine stage considering the rotor blade tip leakage flow was numerically simulated using three-dimensional Reynolds-Averaged Navier-Stokes solutions,so as to study the unsteady aerodynamic performance of the leakage flow,and analyze the unsteady interaction between the leakage flow and the flow around the downstream stator blade.Results show that static pressure fluctuation caused by the leakage flow occurs at the leading edge of the second stator in the position of 85% span,while the fluctuation caused by the potential interaction occurs at the flow path center in the position of 50% span.The distribution and intensity of the leakage vortex basically remains unchanged at exit of the second stator.The leakage flow makes the static pressure in gland seal fluctuate periodically,and the pressure propagates from the downstream to the upstream.

关 键 词：一级半透平 顶部间隙 泄漏流 非定常流动 

分 类 号：TK263.3[动力工程及工程热物理—动力机械及工程]