涡轮叶尖空腔造型数值分析

Numerical Analisis of Cavity Structure at Blade Tip

对某高压涡轮第一级的转子叶尖进行空腔造型处理,并在级环境下对原始叶片和修型叶片进行数值模拟。详细分析了叶尖空腔造型对泄漏流流场的影响,计算比较了不同空腔深度对涡轮效率、泄漏流流量的影响。结果表明:通过对涡轮叶尖进行空腔造型处理,可削弱通道涡和泄漏涡,使泄漏流流量下降,改善出口流场,提高涡轮效率。空腔深度对涡轮效率有较大影响,且存在最佳深度值,在最佳深度值下涡轮效率提高约0.24%。

A steady simulation of a high- pressure turbine＇s first stage was conducted to investigate the effects of the passive control of an improved rotor＇s blade tip with cavity structure. Different influences on efficiency and mass flow of tip leakage flow for different cavity depth of the structure H were compared. The simulation results indicate that： the passive control method, a cavity structure in rotor＇s blade tip, could weaken passage vortex and tip leakage vortex, reduce the mass flow of tip leakage flow, improve the outlet flow field of the turbine and raise the efficiency of the turbine. The turbine efficiency is related to the depth of the cavity structure H, there is an optimal value of H, where the turbine efficiency can in- crease by 0.24% compared with original turbine.