碩士 / 國立交通大學 / 機械工程系所 / 107 / Pin fins are commonly utilized in internal cooling channels of turbine blade. In this study, the steady-state liquid crystal thermography was used to investigate the effect of different sized fins on endwall heat transfer in the array. The staggered pin fin array was placed in a rectangular channel(AR=4:1) with an orientation angle of 135°. Heat transfer experiments were conducted under static and rotating conditions. The experiment was performed at Reynolds numbers of 10000 and 20000, the rotation number ranged from 0 to 0.33. The experimental results show that when the rotation number reaches 0.33, replacing two large pin fins has the highest heat transfer enhancement rate of 21% at the trailing surface. The rotation effect causes the non-uniform array to have a large decrease in heat transfer on leading surface. At the same rotation number, the non-uniform array shows no noticeable improvement on heat transfer at leading and trailing surfaces. The friction factor ratio of the array, with various blockage ratios (24% to 72%), is also investigated in this paper.
| Identifer | oai:union.ndltd.org:TW/107NCTU5489006 |
| Date | January 2018 |
| Creators | Hung, Shuo-Cheng, 洪碩成 |
| Contributors | Liu, Yao-Hsien, 劉耀先 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 62 |
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