EFFECTS OF FILM-HOLE ENTRANCE CONDITION ON SHAPED HOLE FILM COOLING OVER CONVEX SURFACE
The entrance conditions were found to have significant impact on film cooling performance over flat surface by altering the flow boundary condition at the film hole inlet. The extension of entrance effects to film cooling with cylindrical and three kinds of shaped hole with diffused exits over convex surface was presented in this numerical investigation. Film cooling effectiveness generated by shaped holes shown their advantages over cylindrical hole. Entrance conditions,including the direction and the velocity magnitude of coolant flow inside coolant channel, appeared to influence flow filed and thermal characteristics of film cooling over convex surface in a different way from that in the situation over flat plate. Film cooling feed by cross-current coolant flow which tend to have best cooling performance over flat plate were confirm to act as the worst case over convex surface. A total of 48 cases were considered, with 4 kinds of film hole shape, 3 kinds of coolant channel orientations (co-current, counter-current and perpendicular relative to the mainstream), 2 different coolant channel Reynolds numbers (Rehc=23000, 63000) and 2 blowing ratios (M=0.5, 1). The distribution of surface cooling effectiveness, the hydrodynamic characteristics as well as flow patterns were compared within the considered range to gain a physical insight into the entrance effects.
Yangping WANG Peixue JIANG
Key Laboratory for Thermal Sciences and Power Engineering of Ministry of Education,Department of Thermal Engineering, Tsinghua University, Beijing, 100084
国际会议
昆明
英文
263-271
2006-09-18（万方平台首次上网日期，不代表论文的发表时间）