Design and Experiments of Corner with Non-uniformly Distributed Turning Vanes
Other Title
風道轉角區非均勻排列轉向葉片組之設計與測試
Journal
Transactions of the Aeronautical and Astronautical Society of the Republic of China
Journal Volume
29
Journal Issue
1
Start Page
65
End Page
72
Date Issued
1997
Author(s)
HSIN-PIN CHEN
Abstract
轉角區設計是間迴路風洞結構之最大特色，也是冷凍空調風道系統中不可或缺之重要元件，但在文獻中其卻是甚爲難得一見者。本文選定等厚度轉向葉片之轉角區爲研究之對象，改變不同轉向葉片組之設計，包括：轉向葉片尾部延伸長／短之比較，轉向葉片非均勻分布式排列之影響，以及轉向葉片對不同上游入口紊流之效應等進行一系列之風洞實驗測試。由實驗的結果發與：在轉角區中，目前一般之轉角葉片其尾部延伸設計可再縮短以節約能源損耗；而比較八種不同的轉角區轉向葉片排列方式，以外疏而內密之非均勻疏密排列式之葉片分布爲最佳的設計：而其中靠轉角區外牆1/4的部份，最佳之葉片實度值需低於目前文獻中一般傳統均勻排列轉角區所遵循2-5之值。另外，也証實轉向葉片優良的整流能力。本文之結論可提供作爲日後新一代風洞及空調通風系統的設計參考。
Corner design is characteristic feature for close-return wind tunnels and also for ventilation systems of air-conditioning engineering. However, there has been only very few investigations in the existing literature. This paper concerns not only the design of turning vanes with constant thickness itself but also their arrangement in the corner of piping system. This work composes three parts: (a) effect of turning vane with different trailing extension, (b) effects of different arrangements of turning vanes in the corner and (c) influence of different inlet turbulence conditions before the corner. Results shows that, for the part (a), the traditionally designed trailing extension of turning vane could be cut shorter to have better energy efficiency. For the part (b), a new design of non-uniformly distributed turning vanes with smaller solidity in the outer part of the corner was proved to have better energy performance than the traditional design with the same flow quality. Results of part (c) reveal a good turbulence-reduction ability for the corner with turning vanes.
Subjects
風道轉角區
轉向葉片設計
非均勻疏密排列葉片分布
turning corner
turning vanes design
non-uniformly distributed turning vanes
Type
journal article