Flow-Field Analysis of Anti-Kidney Vortex Film Cooling

查看全文 作　　者：Lars [1]Grf;Leonhard [1]Kleiser

机构地区：[1]Institute of Fluid Dynamics

出　　处：《Journal of Thermal Science》索引2012年第21卷第1期,共11页

基　　金：partly funded by Swiss National Science Foundation (SNF) with project number 200020-116310;granted by the DEISA Consortium,co-funded throughthe EU FP7 project RI-222919;the DEISA Extreme Computing Initiative under the project acronym FCool3 摘　　要：Film cooling is an important measure to enable an increase of the inlet temperature of a gas turbine and, thereby, to improve its overall efficiency. The coolant is ejected through spanwise rows of holes in the blades or endwalls to build up a film shielding the material. The holes often are inclined in the downstream direction and give rise to a kidney vortex. This is a counter-rotating vortex pair, with an upward flow direction between the two vortices, which tends to lift off the surface and to locally feed hot air towards the blade outside the pair. Reversing the rotational sense of the vortices reverses these two drawbacks into advantages. In the considered case, an anti-kidney vortex is generated using two subsequent rows of holes both inclined downstream and yawed spanwise with alternating angles. In a previous study, we performed large-eddy simulations (which focused on the fully turbulent boundary layer) of this anti-kidney vortex film-cooling and compared them to a corresponding physical experiment. The present work analyzes the simulated flow field in detail, beginning in the plenum (inside the blade or endwall) through the holes up to the mixture with the hot boundary layer. To identify the vortical structures found in the mean flow and in the instantaneous flow, we mostly use the λ 2 criterion and the line integral convolution (LIC) technique indicating sectional streamlines. The flow regions (coolant plenum, holes, and boundary layer) are studied subsequently and linked to each other. To track the anti-kidney vortex throughout the boundary layer, we propose two criteria which are based on vorticity and on LIC results. This enables us to associate the jet vortices with the cooling effectiveness at the wall, which is the key feature of film cooling. 关键词：燃气涡轮机冷却液功能膜肾脏流场分析湍流边界层入口温度屏蔽材料

相关文献

参考文献（31）
引证文献（1）
耦合文献（0）

参考文献(31)

引证文献(1)

互联网出版许可证新出网证(渝)字10号全国400电话 - 免长途话费

Flow-Field Analysis of Anti-Kidney Vortex Film Cooling

参考文献(31)

引证文献(1)

用户提示