开槽圆柱孔气膜冷却流场的大涡模拟  

Large Eddy Simulation of Film Cooling in Slotted Cylindrical Holes

作　　者：张玲[1] 杨鹤 刘琳琳[1] ZHANG Ling;YANG He;LIU Lin-lin(School of Energy Resource and Mechanical Engineering Northeast Electric Power University,Jilin 132012,China)

机构地区：[1]东北电力大学能源与动力工程学院,吉林132012

出　　处：《汽轮机技术》2018年第5期321-324,共4页Turbine Technology

基　　金：国家自然科学基金资助项目(51576036)

摘　　要：采用大涡模拟的方法对开槽圆柱孔横向紊动射流流动进行数值模拟分析,并探讨在相同工况下,与圆柱孔附近壁面区流场、涡系结构以及传热特性进行比较,从而揭示其流动机理。计算结果表明:圆柱孔开槽之后主流和射流更加剧烈掺混,反向漩涡对被扭转,从而紊乱,使冷气无法抬升,所以提高了冷却效率;由于开槽的作用,冷气在槽内进行充分扩散,相比圆柱孔使轴向冷却范围更大;根据涡量等值线的分析,由于K-H稳定性会改变主流和二次流的交界面的速度方向和大小,进而影响反向漩涡对的形成。By using the method of large eddy simulation of cylindrical hole horizontal turbulent jet flow numerical simulation analysis and comparing the flow field in the wall area near a cylindrical hole,the vortex structure and heat transfer characteristics in the same condition,so as to reveal the flow mechanism. The calculation results show that after the cylindrical holes are slotted,the main stream and the jet are more intense mixing,and the reverse vortex is twisted to disorder,which makes the cold gas unable to lift,so the cooling efficiency is improved. Due to the effect of slotting,the cooling gas is diffused fully in the slot,and the axial cooling range is greater compared to the cylindrical hole. According to the analysis of the vorticity contours,the stability of the K-H will change the velocity direction and size of the interface between the main flow and the two flow,and further affect the formation of the reverse vortex pair.

关 键 词：大涡模拟 开槽圆柱孔 气膜冷却 反向涡对 湍流结构 

分 类 号：TK47[动力工程及工程热物理—动力机械及工程]