摘要
针对燃气透平叶片蒸汽冷却问题,建立了透平叶片内冷通道实验系统.该系统主要包括蒸汽的发生器和调节器、整流段、带测量仪器的实验段、实验段加热装置、排气段、数据采集系统和控制系统.对10种不锈钢带肋实验段中的蒸汽传热和摩擦特性进行了实验研究,其中实验段的宽高比分别为0.25、0.5、1、2、4,肋角度分别为30°、45°、60°、90°,雷诺数为10 000～80 000,由此建立了反映雷诺数、肋角度和通道宽高比影响的传热和摩擦特性实验关联式.结果表明：带肋面宽度的增加使得蒸汽的传热和摩擦阻力增大;雷诺数的增加使得蒸汽的传热显著增强,但是对流动摩擦因子的影响不大;肋角度为60°时蒸汽传热和摩擦系数最大.该结果可为先进的高温燃气透平蒸汽冷却叶片的设计研究提供参考.
To study the steam cooling technology for gas turbine blades,an experiment system was established including a steam generation and conditioning subsystem,a pre-plenum,a test section with instrumentation,a heating device for the test channel,an after-plenum and a data acquisition and control system.The heat transfer and friction loss characteristics of fully developed turbulent steam flow in 10 different ribbed rectangular channels were experimentally examined.The combined effect of the aspect ratio （W/H=0.25,0.5,1,2 and 4）,the rib angleof-attack （α=30°,45°,60° and 90°） and Reynolds number （10,000 to 80,000） was analyzed.Semi-empirical correlations of heat transfer and friction were developed considering the influences of the channel aspect ratio,rib angle,and Reynolds number.The results show that an increase in the ribbed surface width increased both the heat transfer and friction loss of steam flow.The increase in Reynolds number enhanced the heat transfer significantly but had slight effect on the friction loss.The maximum heat transfer coefficient and friction factor were obtained at the channel with 60° ribs.These conclusions may provide reference to the advanced steam-cooled blade design for gas turbines.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2013年第11期1-6,共6页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(51276136)
教育部高等学校博士学科点专项科研基金资助项目(2012201120039)
关键词
燃气轮机
带肋矩形通道
蒸汽冷却
换热特性
摩擦特性
gas turbine
ribbed rectangular channel
steam cooling
heat transfer characteristic
friction characteristic
