https://scholars.lib.ntu.edu.tw/handle/123456789/62342
標題: | Film Cooling over a Concave Surface through Two Staggered Rows of Compound Angle Holes | 作者: | Lee, I-Chien Chang, Yun-Chung Ding, Pei-Pei Chen, Ping-Hei |
關鍵字: | Compound angle; Concave surface; Film cooling | 公開日期: | 2005 | 卷: | 28 | 期: | 5 | 起(迄)頁: | 827-836 | 來源出版物: | Journal of the Chinese Institute of Engineers | 摘要: | Experimental results of film cooling effectiveness over a concave surface with two staggered rows are presented by employing transient liquid crystal thermography. Four different discrete hole configurations are used for the injection of jet flow, including a straight circular hole configuration with a spanwise injection angle (β) of 0° and three forward-expanded hole configurations with β = 0°, 45° and 90° respectively. In all test models there are two staggered rows of discrete holes with streamwise injection angle (γ) of 35°. Blowing ratios (M) are 0.5, 1.0, and 2.0. The effects of blowing ratio, hole expanded angle, and injection angle orientation on film cooling performance are investigated. The jet flow with M = 0.5 is fairly uniform along the wall surface. The lift-off phenomenon can be found in the jet flow with β = 0° for both cases of simple and compound angles at M = 1.0 and also exists among all test cases at M = 2.0 except for β = 90°. The lift-off effect results in a decrease in both η and h /h0. At β = 0°, the jet flow with a forward-expanded hole gives higher η and lower h /h0 than a simple angle hole. At a fixed blowing ratio, the jet flow with compound angle holes has lower q /q0 and thus provides better wall protection than that with simple angle holes. In the present study, the compound angle with β = 0° at M = 2.0 provides the best film-cooling protection over the concave surface among all the test configurations. © 2005, Taylor & Francis Group, LLC. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/85697 https://www.scopus.com/inward/record.uri?eid=2-s2.0-25144463667&doi=10.1080%2f02533839.2005.9671053&partnerID=40&md5=8768f1d698da5d42ef4d3d9c96700d5b |
ISSN: | 02533839 | SDG/關鍵字: | Blow molding; Flow of fluids; Jets; Liquid crystals; Thermography (temperature measurement); Thin films; Compound angle; Concave surface; Film cooling; Hole configuration; Cooling systems |
顯示於: | 機械工程學系 |
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