FILM-COOLING CHARACTERISTICS OF UPSTREAM RAMP ENHANCED TURBINE BLADE SURFACE COOLING

被引：5
|
作者：
Halder, Paresh [1 ]
Samad, Abdus [1 ]
Kim, Jun-Hee [2 ]
Kim, Kwang-Yong [2 ]
机构：
[1] Indian Inst Technol, Dept Ocean Engn, Madras 600036, Tamil Nadu, India
[2] Inha Univ, Dept Mech Engn, 253 Yonghyun Dong, Incheon 402751, South Korea
来源：
HEAT TRANSFER RESEARCH | 2017年 / 48卷 / 11期
关键词：
upstream ramp; film cooling; turbine blade cooling; heat transfer; HEAT-TRANSFER COEFFICIENTS; SINGLE ROUND HOLE; CROSS-FLOW; STREAMWISE ANGLES; EXPANDED EXITS; FLAT-PLATE; PART I; PERFORMANCE; GEOMETRY; RATIO;
D O I：
10.1615/HeatTransRes.2017015557
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Film cooling is widely used in high-performance gas turbines to reduce the surface heat flux. Placing a ramp upstream of a film-cooling hole improves the film-cooling effectiveness. In this work, the Reynolds-averaged Navier-Stokes equations with the k-omega SST model are solved to simulate heat transfer and fluid flow over an upstream ramp and two rows of injection holes. Three blowing ratios (M = 0.6, 1.0, and 1.6) and three upstream ramp angles (alpha=0,14 degrees to 24 degrees) are tested. It is found from the investigation that the film-cooling effectiveness increases with the upstream ramp angle and blowing ratio. Higher film-cooling effectiveness is noticed downstream of the second row holes than that of the upstream holes in the case without a ramp.
引用
收藏
页码：969 / 984
页数：16
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