“冲击-扰流柱”复合式结构换热特性的数值研究

“冲击-扰流柱”复合式结构是航空发动机涡轮叶片尾缘区内重要的冷却结构，研究掌握该结构换热特性对提高叶片冷却设计水平具有重要的意义。冲击孔相对扰流柱排列方式、高度、距离是该冷却结构的主要几何特征参数。每个参数分别选取两个典型参数，得到8个不同的几何模型，采用FLUENT商用软件计算每个模型的12个工况。研究表明，任意模型各个表面的换热强度均随着压比的增加而增大。同一个模型中冲击孔、扰流柱表面较其他表面具有更大的换热系数。一般来说，冲击孔相对扰流柱正向、中间高度、近距离射流能使该结构获得更好的换热性能。

Numerical Investigation of Heat Transfer in Impingement- Cylinders Cooling Structure

Impingement-cylinders is a kind of important cooling structure in trailing edge of aero-engine turbine blade.Investigation on this structure is meaningful to improve the turbine cooling design technology.Arrangement pattern,height and distance are geometry parameters of the jet holes relative location to cylinders.2×2×2 models are set up by changing each parameters twice respectively.Those models are computed by FLUENT in 12 different inlet-to-outlet press ratios.It’s revealed that the heat transfer coefficient of each surfaces in every model increases with the ratios rise.Jet holes and cylinders have lager heat transfer coefficient prefer to other surfaces.Generally,squarely pattern,middle height and close distance make the cooling structure acquire better heat transfer performance.