涡轮叶顶间隙内部流动的数值研究

Numerical Simulation of tip clearance flow inside turbine rotors

动叶叶顶间隙流动是引起涡轮中流动损失的主要原因之一,但由于间隙尺寸较小,且流动方向与叶片转动方向相同,因此很难通过试验测量间隙内部详细的流动及压力分布。通过对"LISA"1.5级轴流涡轮设计工况进行计算,并与试验测量结果进行对比,进而研究间隙内部压力场、流场的分布情况,同时分析间隙高度变化对间隙内部流动的影响。

Tip clearance flow is one of the most important resources of losses in turbine rotors, but it＇s difficult to measure detailed flows and the distribution of static pressure inside the gap,due to the tiny size and the flow direction which is same with the direction of blade rotation.This pa- per presents a numerical simulation of the designed condition of the LISA 1.5 - stage axial turbine,using the measurement results to validate the simulation and obtaining the distribution of pressure and flows inside the gap,meanwhileanalyzing effect of tip gap height on flows inside gap.