涡轮叶尖迷宫式密封对泄漏流场影响的数值模拟

推进技术 ›› 2009, Vol. 30 ›› Issue (1): 88-94.

涡轮叶尖迷宫式密封对泄漏流场影响的数值模拟

李伟,乔渭阳,许开富,罗华铃

西北工业大学动力与能源学院;西北工业大学动力与能源学院;西北工业大学动力与能源学院;西北工业大学动力与能源学院

发布日期:2021-08-15

Numerical simulation of labyrinth seal on tip leakage flow in partially and fully shrouded axial turbine

School of Power and Energy,Northwestern Polytechnical Univ.,Xi’an 710072,China;School of Power and Energy,Northwestern Polytechnical Univ.,Xi’an 710072,China;School of Power and Energy,Northwestern Polytechnical Univ.,Xi’an 710072,China;School of Power and Energy,Northwestern Polytechnical Univ.,Xi’an 710072,China

Published:2021-08-15

摘要/Abstract

摘要： 采用基于密度修正的三维计算流体力学程序,结合雷诺应力湍流模型加壁面函数的方法,对某一轴流涡轮转子叶尖迷宫式密封对泄漏流场的影响进行了数值研究,分析了全叶冠密封和部分叶冠密封中的泄漏流场,并详细研究了迷宫密封采用的锯齿状肋条数目对密封效果的影响,最后计算了转子效率。结果表明:涡轮叶尖表面加叶冠对进行密封,可以显著提高涡轮效率,全叶冠密封下涡轮效率提高1.15301%,部分叶冠密封涡轮效率增加0.54713%;迷宫密封中锯齿状肋条数有一个最佳值,且在此锯齿状肋条数下进行迷宫密封涡轮效率相对无锯齿状肋条增加0.1%。

关键词: 叶尖泄漏流+;迷宫密封+;锯齿状肋条+;叶冠;数值仿真

Abstract: A density-correction based,3D Reynolds-averaged Navier-Stokes equations CFD code with Reynolds stress model and wall function was used to simulate the effects of labyrinth seal on the tip leakage flow in a turbine rotor.The tip leakage flow in partially and fully shrouded axial turbine is analyzed and the effect of the saw tooth rib number on the sealing performance is studied in details.The turbine efficiency is calculated.The results show that the tip shroud can significantly increase the turbine efficiency.The efficiency can increase by 1.15301% in fully shrouded turbine,and so does it by 0.54713% in partially shrouded turbine.There is an optimal sawtooth rib value in the labyrinth seal.Compared with non-sawtooth rib,the turbine efficiency in this labyrinth seal can increase by 0.1%.

Key words: Tip leakage flow+;Labyrinth seal+;Sawtooth rib+;Tip shroud;Numerical simulation

李伟,乔渭阳,许开富,罗华铃. 涡轮叶尖迷宫式密封对泄漏流场影响的数值模拟[J]. 推进技术, 2009, 30(1): 88-94.