Numerical Study of Steam Film Cooling Behavior on a Thick-wall Cylinder
Numerical simulations are performed in this study to investigate steam film cooling behavior on a high temperature thick-wall cylinder.The temperatures of the main flow steam and cooling steam are 700℃ and 530℃ respectively based on the operating condition from steam turbine power plant.Simulation of film cooling with a single cooling hole on the thick-wall cylinder is carried out at different blowing ratio.A model with five staggered cooling holes on the thick-wall cylinder is established based on the cooling performance resulting from the case with a single cooling hole.All holes in this study have an injection angle of 30° and have the same diametcr 26mm.Static structural analysis on the thick-wall cylinder with five cooling holes is carried out to investigate the effect of cooling holes structure on the thick-wall cylinder under high temperature conditions.The results show that the low blowing ratio keeps the cooling steam close to the wall, while high blowing ratio helps bring the cooling back to the wall, and the best adiabatic cooling effectiveness occurs when blowing ratio reaches 0.43.The simulation of the case with five staggered cooling holes on the thick-wall cylinder demonstrates that the cooling holes upstream increases the cooling effectiveness of the cooling hole downstream.The results also show that the existence of cooling holes causes a stress concentration around the hole leading edge and finally has an influence on the structural integrity of the thick-wall cylinder.The commercial software Ansys is adopted in this study, and the shear stress transport (SST) model is adopted as the turbulence model.
numerical simulation steam film cooling thick-wall cylinder blowing ratio cooling effectiveness
Zhenwei CAI Weizhe WANG Amankwa Adjei RICHARD Yingzheng LIU
Key Laboratory of Power Machinery and Engineering, School of Mechanical and Power Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P.R.China;Gas Turbine Research Institute, Shanghai Jiaotong University, Shanghai, 200240, P.R.China
国际会议
长沙
英文
217-222
2016-10-16（万方平台首次上网日期，不代表论文的发表时间）