Experimental investigation on impingement-effusion film-cooling behaviors in curve section |
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| Authors: | Yang Wei-hua Cao Jun Shi Rui Hao Xu-sheng Song Shuang-wen |
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| Institution: | 1. College of Energy and Power, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2. China Aviation Powerplant Research Institute, Zhuzhou 412002, China;1. Institute of Turbomachinery, School of Mechanical Engineering, Shanghai Jiao Tong University, Dongchuan Road 800, Shanghai, 200240, China;2. School of Automobile and Traffic Engineering, Jiangsu University of Technology, Zhongwu Road 1801, Jiangsu, Changzhou, 213001, China;1. Department of Mechanical Engineering, Faculty of Engineering, South Valley University, Qena 83521, Egypt;2. Department of Mechanical Engineering, National Research Centre, Dokki, Cairo 12311, Egypt;3. Department of Mechanical Engineering, Faculty of Engineering, Sohag University, Sohag, Egypt |
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| Abstract: | A new series of test pieces with different geometrical configuration and geometry dimensions are designed to experimentally investigate on impingement-effusion cooling behavior in curve effusion wall of combustion chamber. The test results show that the discharge coefficient increased with the increasing blowing ratio. The effusion hole–hole spacing has an effect on the discharge coefficient and the discharge coefficient commonly decreased with the increment of effusion hole–hole spacing. The blowing ratio greatly effects cooling behavior. The bigger blowing ratio is favorable for improving cooling characters. At the curved effusion wall, to begin with, cooling effectiveness increased slowly and kept a steady value in subsequence. But, for the rear end of curved effusion wall, it decreased slowly. With decreasing of effusion hole angle and effusion hole–hole spacing, cooling effectiveness is enhanced. Meanwhile, blowing ratio, effusion angle and effusion hole–hole spacing take an evident effect on the discharge coefficient. |
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