不同地形之邊界層特性之風洞模擬

機構典藏 > College of Engineering > Graduate Institute & Department of Civil Engineering > Thesis > Item 987654321/74491

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Title:	不同地形之邊界層特性之風洞模擬
Other Titles:	Wind tunnel investigation on the different topography of characteristics of atmospheric boundary layer
Authors:	郭庭瑋;Kuo, Ting-Wei
Contributors:	淡江大學土木工程學系碩士班鄭啟明;Cheng, Chii-Ming
Keywords:	大氣邊界層;粗糙元素;風洞實驗;boundary layer;roughness blocks;wind tunnel
Date:	2011
Issue Date:	2011-12-28 18:44:33 (UTC+8)
Abstract:	隨著科技發展、醫學進步，人口逐漸現象，但在有限的土地上求生活空間，所以建築物有向上發展的趨勢，加上政府近年來推動都市更新的計畫，都市中存在著越來越多的高層建築。因此若我們要探討不同地形在流場上的差異，勢必要進行風洞實驗的模擬。在過去風洞實驗中將地形區分為城市、郊區、平坦地形三種標準地況。但如果要進行一個真實地形的邊界層模擬，在製作該地形的縮尺模型上需要耗費大量的人力與時間。本研究希望能將真實地形模擬成單一均勻的粗糙方塊，利用該地形代表著原實場地型進行風洞實驗。若能找出一個適當的設計方法進行模擬，在未來進行風洞實驗時可以節省許多的經費與時間。並且，在實場量測中我們無法得知大氣邊界層的紊流特性，透過風洞實驗的結果，我們能更了解該地形的邊界層特性。研究結果顯示：我們可以利用建物平均高度與密度來模擬我們欲求的地況，在風速頗面、紊流與紊流尺度都與實驗十分相符。以von-Karman經驗公式為參考，頻譜所模擬出的結果也吻合。因此利用該方法進行粗糙元素的設計皆有不錯的相似性。 Before, we only have three typical terrain’s roughness blocks. If we want to know a real topography’s wind feature, we have to make a reduced scale’s model to simulate it. But it will be waste human resources and spend a lot of time and money. So if we can find some way to use roughness blocks to simulate the real topography, it will be more efficiently. On the other hand, in the field measurement we can’t got the information of the turbulence. If we successfully use the way to simulate terrain, we can got more information of terrain. The results show that we can use the mean height of the build and density of the terrain to simulate the real topography. In roughness block’s experiment, we successfully simulate the wind profile, turbulence intensity and turbulence length scale.
Appears in Collections:	[Graduate Institute & Department of Civil Engineering] Thesis

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