摘要
数值模拟了不同出口宽度的扇形孔射流在不同吹风比下的气膜冷却效率,侧重于分析涡流结构和涡量对冷却效率的影响。结果表明,出口宽度增大不但减小了涡量,还改变了涡流方向。出口宽度增大到2.5倍入口直径时,孔中心下游冷气流线由燃气指向壁面,有效改进冷气贴附性。气膜孔出口宽度越大,冷却效率越大。随着吹风比的增加,气膜孔出口宽度对冷却效率影响越明显。
Numerically simulated and studied were the air film cooling efficiency of the jet flow from fan-shaped holes with various widths at the outlet at different air blowing ratios.The emphasis was placed on an analysis of the influence of the vortex configuration and vorticity on the cooling efficiency.It has been found that to increase the outlet width will not only decrease the vorticity but also change the direction of the vortex.When the outlet width increases to 2.5 times bigger than that of the inlet diameter,the streamlines of the cooling air at the downstream of the hole center will point to the wall surface from the fuel gas,effectively improving the attachment property of the cooling air.The bigger the outlet width of the air film hole,the higher the cooling efficiency.With an increase of the air blowing ratio,the influence of the outlet width of the air film hole on the cooling efficiency will become more conspicuous.
出处
《热能动力工程》
CAS
CSCD
北大核心
2012年第4期416-419,511-512,共4页
Journal of Engineering for Thermal Energy and Power
基金
航空科学基金资助项目(2010ZB54004)
辽宁教育厅基金资助项目(L2010425)
关键词
涡轮叶片
气膜冷却
涡量
冷却效率
数值模拟
turbine blade,air film cooling,vorticity,cooling efficiency,numerical simulation
