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Affiliation of Author(s):能源与动力学院

Journal:CHINESE JOURNAL OF AERONAUTICS

Key Words:Discharge coefficient Experimental test Film cooling effectiveness Heat transfer In-hole blockage

Abstract:An experimental study is made to investigate the film cooling performance of imperfect holes due to in-hole blockage over a flat plate. A specifically pyramid-shaped element is used to simulate the in-hole blockage. Six in-hole blockage orientations (such as leading-inlet, leading-middle, leading-exit, trailing-inlet, trailing-middle and trailing-exit) and four blocking ratios (ranging from 0.1 to 0.4) are taken into considerations. Based on the experimental results, the influences of in-hole blockage on the film cooling effectiveness and discharge coefficient under typical blowing ratios are analyzed. It is confirmed that the in-hole blockage results in a reduction of discharge coefficient related to the perfect film cooling holes, especially for the leading-exit and trailing-inlet orientations with a big blocking ratio. However, in the view of film cooling effectiveness, the in-hole blockage shows complicated affecting roles. In general, except for the leading-exit orientation, the in-hole blockages produce detrimental influence on the film cooling effectiveness. (C) 2018 Chinese Society of Aeronautics and Astronautics. Production and hosting by Elsevier Ltd.

ISSN No.:1000-9361

Translation or Not:no

Date of Publication:2018-06-01

Co-author:Huang, Ke'nan,TAN Xiaoming,Shan Yong

Correspondence Author:zjz