冷却气膜与热障涂层交界处流场分析  

Analysis of Conjugate Flow Field between Cooling Film and Thermal Barrier Coating

作　　者：李佳莉[1] 王玉璋[1] 王星[1] 

机构地区：[1]上海交通大学燃气轮机研究院,上海200240

出　　处：《航空材料学报》2015年第6期65-70,共6页Journal of Aeronautical Materials

基　　金：上海交通大学燃气轮机研究院科研基金;国家863计划(2014AA052803)

摘　　要：为了研究热障涂层孔隙微结构对其表面冷却气膜流场的影响,本工作基于层状和柱状热障涂层(TBC)真实结构,通过灰度处理和像素识别,获得涂层微结构并形成计算网格。利用格子Boltzmann方法(LBM),建立了冷却气膜和热障涂层微结构内流动微观分析模型。结果表明:热障涂层微结构对冷却气膜和涂层交界处气膜流动有较大的影响,来流的垂直方向上产生扰动,会影响冷却气膜的稳定性;柱状结构涂层竖直微孔内存在微弱的气体流动,表面交界处产生漩涡;层状结构涂层表面比较粗糙,气膜竖直方向速度波动相比柱状结构更加剧烈。To study the effects of pores＇ micro-structure of thermal barrier coating on its surface flow field, the micro-structure and grid of the coating were generated by Matlab through grey processing and pixel identifying based on layered and columnar thermal barrier coating. The microscopic flow models between the cooling film and thermal barrier coating were developed by Lattice Bohzmann method. The results indicate that the micro-structure of thermal barrier coating has a great influence on the gas flow between the cooling film and the coating. Disturbance appears in the vertical direction of the inlet flow, and it will affect the stability of the film. Weak flow ex- ists in the pores of columnar coatings, and a vortex flow generates on the conjugate surface. The pulsation of vertical velocity of the gas film of layered coating is more severe than that of columnar coating because of the rough surface.

关 键 词：热障涂层 多孔介质 LATTICE-BOLTZMANN 流场分布 

分 类 号：TG174.442[金属学及工艺—金属表面处理]