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題 名 | 開口對建築物流場之影響=The Influence of an Opening on the Flow Characteristics of a Building |
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作 者 | 任森珂; 許茂雄; 周榮華; | 書刊名 | 建築學報 |
卷 期 | 16 1996.03[民85.03] |
頁 次 | 頁81-92 |
分類號 | 441.572 |
關鍵詞 | 雷諾數; Strouhal數; 馬蹄型渦流; 渦漩釋放; 分離線; Reynolds number; Strouhal number; Horseshoe vortex; Vortex shedding; Separation line; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究以縮小比例的模型探討開口對建築物流場的影響。模型置於水桌流場視流設備中,以染液視流法及近壁流線法觀察建築物的流場結構。 模型有兩個,皆為方形,一個為有開口模型,一個為無開口模型。水流角度有0°、30°、45°、60°及90°,以模擬各方向吹襲的風力。雷諾數為900。 實驗結果顯示建築物開口所造成的影響為使騎樓風較小(即建築物前端地面的回流分離區範圍也較小)、尾流區較小、風阻較小及渦漩釋放的頻率降低。但若水流角度轉至45°,開口附近會有數種不同釋放頻率的渦漩出現,由此可減少建築物產生共振的現象。 |
英文摘要 | This study uses small scale model to investigate the influence of an opening on the flow characteristic of a tall building. The study was conducted experimentally in the water table flow visualization facility. Two models were tested, one with an opening, the other without an opening. The Reynolds number was 900 and five flow angles were examined, namely 0°、30°、45°、60°and 90° respectively. The results indicate that the opening in a building reduces the area influenced by the adverse pressure gradient on the windward side of the building, the area of wake on leeward side is also reduced. Hence the wind effects on the building drag and on the environments are reduced. In addition, the vortex shedding frequency is also reduced. When the flow angle is at 45°, different shedding frequencies appear. This phenomenon will help to reduce the structural resonance. |
本系統中英文摘要資訊取自各篇刊載內容。