封严泄漏流对端壁换热特性的影响机制
The Effect of Seal Leakage Flow on Endwall Heat Transfer
董逸飞 1李雪英 1任静1
作者信息
- 1. 清华大学能源与动力工程系,北京 100084
- 折叠
摘要
燃气轮机封严泄漏流对端壁处的流动换热具有显著影响.本文采用经实验验证的三维RANS数值方法,分析了不同泄漏流流量、旋流角和射流角与主流交互作用对端壁换热的影响机制.结果表明,泄漏流质量流量比增大强化了马蹄涡并增强了换热:旋流角增大强化了马蹄涡压力侧分支与马蹄涡吸力侧分支的掺混,导致前缘处的换热增强:射流角增大降低了泄漏流的流向穿透力,增强了叶栅前部换热.该结果有助于封严结构设计及端壁热防护.
Abstract
The seal leakage flow of gas turbine has significant influence on the flow and heat transfer on the endwall.In this paper,the interaction between seal leakage flow and main stream with different mass flow ratio,leakage flow jet angle and leakage flow swirl angle on endwall heat transfer are analyzed by using the experimentally verified three-dimensional RANS numerical method.The results show that increasing the mass flow ratio of the leakage flow strengthens the horseshoe vortex and enhances the heat transfer.The mixing of pressure side leg and suction side leg of the horseshoe vortex is strengthened with the increase of swirl angle,resulting in enhanced heat transfer at the leading edge;The increase of jet angle reduces the penetrating force of leakage flow and enhances the heat transfer in front of cascade.The results are helpful for seal structure design and endwall thermal protection.
关键词
燃气轮机/封严泄漏流/端壁换热/数值模拟Key words
gas turbine/seal leakage flow/endwall heat transfer/numerical simulations引用本文复制引用
基金项目
国家科技重大专项(2017-111-0009-0035)
出版年
2024
NETL
NSTL
万方数据