Film cooling in the trailing edge cutback with different land shapes and blowing ratios

被引:19
作者
Du, Wei [1 ,2 ]
Luo, Lei [1 ]
Wang, Songtao [1 ]
Sunden, Bengt [2 ]
机构
[1] Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Peoples R China
[2] Lund Univ, Dept Energy Sci, Div Heat Transfer, Lund, Sweden
基金
瑞典研究理事会;
关键词
Trailing edge; Cutback region; Film cooling; Land shape; Detached eddy simulation; HEAT-TRANSFER; FLOW STRUCTURE; TURBINE BLADE; PERFORMANCE; NUMBER;
D O I
10.1016/j.icheatmasstransfer.2021.105311
中图分类号
O414.1 [热力学];
学科分类号
摘要
The cutback was widely used in advanced gas turbines to protect the trailing edge. The land was a main structure in the cutback region. Therefore, the present study describes a numerical investigation on the film cooling performance in the cutback region with various land shapes (straight-expanding land, arch-expanding land, contracting-expanding land and campaniform land) and blowing ratios (0.2, 0.8 and 1.25). According to the numerical validation, the detached eddy simulations agreed well with the experimental results compared to other turbulence models. The flow structure, film cooling effectiveness and total pressure loss in the cutback region were displayed. Results indicated that the main flow separation vortex, cooling separation vortex, Kelvin-Helmholtz vortex and counter rotating vortices were strongly associated with the land shape and blowing ratio. The Kelvin-Helmholtz vortex was invisible at low blowing ratio and was small at the campaniform land shape. The contracting-expanding land resulted in weak counter rotating vortices within the cutback region. The stronger counter-rotating vortices brought lower film cooling effectiveness. Therefore, the contracting expanding land provided relatively high film cooling effectiveness for most blowing ratios. The different land shape also caused different total pressure losses both in the cooling passage and main flow.
引用
收藏
页数:12
相关论文
共 29 条
[1]   Experimental investigation of the effects of blowing conditions and Mach number on the unsteady behavior of coolant ejection through a trailing edge cutback [J].
Barigozzi, Giovanna ;
Armellini, Alessandro ;
Mucignat, Claudio ;
Casarsa, Luca .
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, 2012, 37 :37-50
[2]   Pressure Side and Cutback Trailing Edge Film Cooling in a Linear Nozzle Vane Cascade at Different Mach Numbers [J].
Barigozzi, Giovanna ;
Perdichizzi, Antonio ;
Ravelli, Silvia .
JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME, 2012, 134 (05)
[3]   Measurements of 3D velocity and scalar field for a film-cooled airfoil trailing edge [J].
Benson, Michael J. ;
Elkins, Christopher J. ;
Eaton, John K. .
EXPERIMENTS IN FLUIDS, 2011, 51 (02) :443-455
[4]   High resolution PIV measurements around a model turbine blade trailing edge film-cooling breakout [J].
Chen, Yude ;
Matalanis, Claude G. ;
Eaton, John K. .
EXPERIMENTS IN FLUIDS, 2008, 44 (02) :199-209
[5]   Heat transfer and flow structure in a detached latticework duct [J].
Du, Wei ;
Luo, Lei ;
Wang, Songtao ;
Liu, Jian ;
Sunden, Bengt .
APPLIED THERMAL ENGINEERING, 2019, 155 :24-39
[6]   Flow structure and heat transfer characteristics in a 90-deg turned pin fined duct with different dimple/protrusion depths [J].
Du, Wei ;
Luo, Lei ;
Wang, Songtao ;
Zhang, Xinghong .
APPLIED THERMAL ENGINEERING, 2019, 146 :826-842
[7]   Effect of the dimple location and rotating number on the heat transfer and flow structure in a pin finned channel [J].
Du, Wei ;
Luo, Lei ;
Wang, Songtao ;
Zhang, Xinghong .
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2018, 127 :111-129
[8]   DES study of blade trailing edge cutback cooling performance with various lip thicknesses [J].
Effendy, M. ;
Yao, Y. F. ;
Yao, J. ;
Marchant, D. R. .
APPLIED THERMAL ENGINEERING, 2016, 99 :434-445
[9]  
Effendy M., 2014, AIAA 2014 0279
[10]   Investigation of boundary layer thickness and turbulence intensity on film cooling with a fan-shaped hole by direct numerical simulation [J].
Fu, Wu-Shung ;
Chao, Wei-Siang ;
Tsubokura, Makoto ;
Li, Chung-Gang ;
Wang, Wei-Hsiang .
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER, 2018, 96 :12-19