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| 題 名 | 海岸港口地區紊流邊界層內之重質氣體污染物溢漏擴散風洞實驗探討=Wind Tunnel Investigation on the Heavy Gas Dispersion in the Turbulent Boundary Layer Flow of Coastal and Harbor Region |
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| 作 者 | 蕭葆羲; 吳孟訓; | 書刊名 | 海洋工程學刊 |
| 卷 期 | 7:2 2007.12[民96.12] |
| 頁 次 | 頁69-84 |
| 分類號 | 445.9 |
| 關鍵詞 | 海岸港口地區; 中性紊流邊界層; 重質氣體雲團; 密度福祿數; Coastal and harbor region; Neutral turbulent boundary layer; Heavy gas cloud; Densimetric Froude number; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 本實驗係在環境風洞中模擬探討於海岸港口地區紊流邊界層內重質氣體連續溢漏時所形成雲團之擴散特性。藉由風洞實驗量測結果,分析研究當重質氣體在各種溢漏角度、以及溢漏密度福祿數條件下對於重質氣體濃度擴散之影響效應。實驗選擇重質氣體之溢漏角度爲0°(水平)、45°、及90°(垂直),密度福祿數爲8、10、12與15,迫近流場爲海岸港口地區之中性大氣紊流邊界層。實驗結果之分析顯示:水平角度溢漏時,雲團在地面之濃度相較其他角度時爲大。溢漏角度較小時,各下游處之雲團最大濃度相較溢漏角度大者爲大;但隨著下游距離增加,雲團持續擴散,使得雲團最大濃度之差異性變小。另外當溢漏密度福祿數增加時,雲團擴散使其對於海岸或港口地區地面所造成危險之範圍變大。 |
| 英文摘要 | Experiments of dispersion for continuous spill of heavy gas in the turbulent boundary layer flow of coastal and harbor region were conducted in the environmental wind tunnel. Concentration distributions of the heavy gas for different gas spill angles, and densimetric Froude numbers were measured and investigated. The gas spill angles performed in the experiments were 0°, 45° and 90°. The densimetric Froude numbers were 8, 10, 12, and 15. Experimental results show that when the gas spill angle is 0° (i.e. horizontal spill), the heavy gas cloud spreads longer and presents higher ground concentration than that of gas spill angles of 45° and 90°. Measurements of ground concentration reveal that as the densimetic Froude number grows, the lower flammability distance (LFD) increases. The increase of LFD means that the dangerous coastal or harbor areas are augmented. |
本系統中英文摘要資訊取自各篇刊載內容。