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題名 | Wind Tunnel Measurement of Pollution Dispersion in the Built Environment of Arrays of Cubic Elements=污染在列陣式方塊建物排列之環境擴散風洞實驗研究 |
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作 者 | 蕭葆羲; 林彥伸; | 書刊名 | 海洋工程學刊 |
卷期 | 17:3 2017.09[民106.09] |
頁次 | 頁141-156 |
分類號 | 445.9 |
關鍵詞 | 擴散尺度; 風攻角; 高斯分布; 方塊建物排列間距; Dispersion scales; Wind attack angle; Gaussian distribution; Arrays of cubic elements; |
語文 | 英文(English) |
中文摘要 | 本文應用大氣環境風洞模擬點源廢氣排放於列陣式方塊建物環境之污染擴散特性。不同之風攻角與列陣式建物間距對於污染擴散,在風洞實驗中藉由量測追蹤氣體之濃度分佈變化結果,進行分析以及探討渠等對擴散特性之影響效應。 |
英文摘要 | In this study, experiments on the dispersion of pollution in built environment of cubic building array in-line configuration with different wind directions were conducted in wind tunnel. Effects of wind attack angle, θ and building array gap, G/H (G: building array gap, H: cubic building height) on the short range dispersion were investigated. Measurements of flow field show that the building array gap increases, the mean velocity increases, and the building array gap becomes smaller, the turbulence intensity is higher. Results of the flow field and concentration measurements indicate that the decrease of the cubic building array gap will be favorable for pollutants dispersion in built environment. The lateral concentration profiles at downstream stations of source are shown to be approximately Gaussian distribution when the cubic building array gap G/H=3 with wind attack angle θ=0⁰. As the cubic building array gap G/H=2 and 1 with wind attack angle θ>0⁰, the lateral concentration profiles at downstream stations of source tend to be the non-Gaussian form. The wind attack angle of 45⁰ shows that the lateral dispersion length scales are larger than that of other wind attack angles. Gap variation of cubic building array has shown no significant effect on vertical length scales. |
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