复合角度对称射流气膜冷却效率的数值研究  

Numerical Research on Film-cooling Efficiency of Injection with Opposite Orientation Compound Angles

作　　者：李少华[1] 彭涛[1] 张玉[1] 郭婷婷[1] 

机构地区：[1]东北电力大学能源与机械工程学院,吉林132012

出　　处：《动力工程》2009年第3期236-240,共5页Power Engineering

基　　金：国家自然科学基金资助项目(50606005)

摘　　要：采用realizable k-ε模型,通过数值模拟分析了各种孔排结构在不同吹风比下对气膜冷却效率的影响.结果表明:边界层等温线反映了上、下游射流孔所产生的射流之间的相互作用;当吹风比M=0.5时,由于射流紧贴壁面,各种孔排结构都有较好的冷却效果,随着吹风比的增大,射流逐渐脱离壁面;当顺排排列时,由于上游射流孔的作用,使得下游射流能很好地贴附壁面,在M=2.0时,冷却效果仍然较好;孔排3在M=0.5时有较高的冷却效率;而对于孔排1,当M=1时,气膜在x/d=2区域以后有很好的保护作用.The effects of various structure of holes in rows on the film-cooling efficiency under different blowing ratios were analyzed by numerical simulation with realizable be model. Results show that, the isotherm of boundary layer illustrates the interaction between the injection from the holes in the upstream row and the downstream row. When the blowing ratio M=0.5, the cooling efficiency is better for various structural of holes in rows due to the jet flow cling to the wall surface. The jet flow separates the surface gradually with the flowing ratio increasing. The downstream jet flow could attach to the wall surface well due to the action of the upstream injection hole when the holes array in cis-arrangement. And the cooling affect is still better when M=0.2. The higher film cooling efficiency can be obtained at the blowing ratio of 0.5 for hole-rows 3; While for hole-rows 1, the blowing ratio of 1.0 yields better protection of film beyond x/d= 2. 0.

关 键 词：燃气轮机 气膜冷却 复合角度 对称射流 排列方式 数值模拟 

分 类 号：TK229[动力工程及工程热物理—动力机械及工程]