涡轮叶片内部冷却通道传热和压力 分布特性的实验

陈伟; 阚瑞; 任静; 蒋洪德

涡轮叶片内部冷却通道传热和压力分布特性的实验

清华大学机械工程学院热能工程系燃气轮机研究中心,北京 100084

基金项目: 国家重点基础研究发展计划(2007CB210100)

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出版历程
- 收稿日期: 2009-11-09
- 修回日期: 2010-03-17
- 刊出日期: 2010-12-28

Experimental investigation of heat transfer and pressure drop in a two-pass internal coolant passages of gas turbine airfoil

Gas Turbine Research Center,Department of Thermal Engineering, School of Mechanical Engineering,Tsinghua University,Beijing 100084,China

摘要

摘要: 针对带45°肋片圆形弯头U型通道进行了传热和压力分布特性的实验研究.实验中进口雷诺数变化范围在30000~55000之间.研究表明,肋片引起的横向二次流在弯头前区域是强化传热的主要因素.不同雷诺数下传热分布和压力分布的趋势完全一致,但弯头区后半段上传热分布有所差异.通道中的最大压降出现在弯头区,进口雷诺数越大,弯头损失系数和总损失系数都有所减小.流体在圆形弯头中,加速效果没有矩形弯头强烈,弯头区和弯头后的传热较矩形弯头都有较大幅度地减小.
- 带肋U型通道 /
- 瞬态液晶 /
- 传热 /
- 压力损失 /
- 内部冷却
Abstract: An experimental investigation was conducted to assess the heat transfer and pressure drop distribution of a two-pass channel with a round turn.The Reynolds numbers investigated varied from 30000 to 55000.This demonstrates that the secondary flow induced by ribs is the main factor to enhance the heat transfer before turn region.Under different Reynolds numbers,the trend of heat transfer and pressure drop distribution in the duct is consistent.However,the heat transfer in the after turn region is different.Moreover,the largest pressure drop occurs in the turn region.As the Reynolds number increases,the loss coefficient of the turn and the whole duct will decrease.Compared with two-pass channel with a sharp turn,the heat transfer in the turn region and after turn region in this study is lower,because the acceleration effect in the round turn region is not as strong as that in sharp turn.
- ribbed U-duct /
- transient liquid crystal /
- heat transfer /
- pressure loss /

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参考文献(17)

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