热科学学报（英文版）2009，Vol.18Issue(4)：306-312,7.DOI:10.1007/sl1630-009-0306-z
Numerical Investigation of Active Tip-clearance Control through Tip Cooling Injection in an Axial Turbine Cascade
Numerical Investigation of Active Tip-clearance Control through Tip Cooling Injection in an Axial Turbine Cascade
Maosheng Niu 1Shusheng Zang1
作者信息
- 1. Institute of Turbomachinery, School of Mechanical Engineering, Shanghai JiaoTong University, Shanghai 200240, China
- 折叠
摘要
Abstract
This paper presents a numerical investigation of an active tip-clearance control method based on cooling injection from the blade tip surface. It aims to study the influences of air injection on controlling tip clearance flow, with emphasis on the effects of the injection location on secondary flow and the potential thermal benefits from the cooling jet. The results show that injection location plays an important role in the redistribution of secondary flow within the cascade passage. Injection located much closer to the pressure-side comer performs better in reducing tip clearance massflow and its associated losses. However, it also intensifies tip passage vortex, due to less re-straint deriving from the reduced tip clearance vortex. Lower plenum total pressure is required to inject equivalent amount of cooling air, but the heat transfer condition on the blade tip surface is a bit worse than that with injection from the reattachment region. Thus the optimum location of air injection should be at the tip separation vortex re-gion.关键词
active tip-clearance control/ tip cooling injection/ injection location/ tip clearance vortex/ passage vortex/ secondary flowKey words
active tip-clearance control/ tip cooling injection/ injection location/ tip clearance vortex/ passage vortex/ secondary flow分类
数理科学引用本文复制引用
Maosheng Niu,Shusheng Zang..Numerical Investigation of Active Tip-clearance Control through Tip Cooling Injection in an Axial Turbine Cascade[J].热科学学报（英文版）,2009,18(4):306-312,7.
