摘要
应用数值方法和标准k-ω紊流模型,研究了凹槽对燃气轮机透平动叶顶部间隙内流动与换热的影响,考虑了平顶部及4种不同深度凹槽的影响。结果显示,在凹槽内存在复杂的流动结构,不同凹槽深度时呈现出不同的涡结构.在凹槽深度小于3%相对叶高时,泄漏流动随凹槽深度的增加而减少,而高于3%时泄漏流量则几乎不变。凹槽的存在使得凹槽底部局部区域换热率较平顶部时升高,但总体来说,叶顶平均表面换热率随凹槽深度的增加而降低.
A numerical study was performed to simulate the tip leakage flow and heat transfer on the first stage rotor blade in GE-E3 engines. Calculations were performed for both flat and squealer blade tips by solving Reynolds-averaged N-S equations in conjunction with the standard κ - ω two- equation turbulence model. For squealer tip blade, several cases were considered with four different groove depth-blade span ratios of 1%, 2%, 3% and 4%. The effects of the tip groove depth on flow and heat transfer are significant. The leakage flow is weakened by deepening the tip groove. But when the groove depth is larger than 3% of blade span, no further leakage flow reduction will occur. The averaged heat transfer rate on the tip surface reduces with the increasing of groove depth.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2007年第6期936-938,共3页
Journal of Engineering Thermophysics
基金
国家重点基础研究"973"资助项目(No.2007CB210107)
关键词
间隙流
顶部换热
轴流透平
凹槽状叶顶
leakage flow
tip heat transfer
axial turbine
squealer tip
