摘要
本文主要对采用叶顶喷气方法来控制船用燃气轮机涡轮叶栅中的间隙流动进行了试验研究。研究重点在于叶顶喷气对间隙流动的影响分析,因此采用三孔探针对叶栅出口截面的流场分布进行了测量,同时还测量了叶片表面静压分布情况。研究结果表明,叶顶喷气可以减弱间隙流动,降低间隙流动损失。研究还发现,喷气位置对喷气效果有较大的影响。采用相同的试验条件时,当喷气孔位于叶片后部位置时可以获得更好的喷气效果。
This investigation presents detailed experimental measurements of an active tip -clearance control method based on tip injec-tion in a marine gas turbine .It aims to study the influences of tip injection on controlling tip clearance flow , with emphasis on the effects of injection locations .Detailed flow field measurements were made downstream of the cascade using a three-hole probe.Static pressure distributions were also measured on the blade surface at 50%and 97.5%span, respectively.The results in the current inves-tigation suggest that tip injection can weaken tip clearance flow , reducing the tip clearance losses .It also can be seen that injection location plays an important role in the redistribution of secondary flow within the cascade passage .With the same injection mass flow , injection from fewer holes could obtain better performance in controlling tip clearance flow .Considering the chordwise distribution of injection holes, it can be concluded that holes located in the aft part of blade can perform much better than that in the front part when the same experimental conditions are applied .
出处
《燃气轮机技术》
2014年第2期1-7,共7页
Gas Turbine Technology
关键词
船用燃气轮机
间隙流动控制
叶顶喷气
二次流
marine gas turbine
active control of tip clearance flow
tip injection
secondary flow
