Experimental Measurement on the Pollution Dispersion of Negative Buoyant Heavy Gas Plume in the Topography with Upwind Slope

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簡歷

基本資料

Project title

Code/計畫編號

NSC102-2221-E019-033

Translated Name/計畫中文名

重質氣體負浮昇羽昇流污染在斜坡地形之延散特性實驗

Project Coordinator/計畫主持人

Bao-Shi Shiau

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Harbor and River Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=3100149

Year

2013

Start date/計畫起

01-08-2013

Expected Completion/計畫迄

01-07-2014

Bugetid/研究經費

565千元

ResearchField/研究領域

土木水利工程

"臺灣海岸石化工業區或港口石化碼頭常見有化學氣體之輸運與儲存，此類氣體具毒性且密度比空氣大，一般稱為重質流體或重質氣體。當發生公安意外，此等重質氣體由儲存槽體溢漏排放，將對週遭環境造成污染。該等重質氣體溢漏排放後，在紊流形態之海岸地區風場或港口碼頭環境風場作用下，形成之擴散造成周遭區域之影響範圍與環境污染災害問題之預測及研究探討，係有助於評估是否符合國家相關環境保護法規與工安法規等(例如：海洋污染防治法或空氣污染法等)之規範。由於重質氣體密度大於周遭空氣，其連續溢漏後將形成負浮昇羽昇流。現況海岸石化廠區儲存槽週遭以堤岸式阻體防護為常見，因此若發生重質氣體連續溢漏，將形成負浮昇羽昇流並與具斜坡地形之阻體作用。本計畫實驗量測以二氧化碳模擬重質氣體連續溢漏排放，其形成之負浮昇羽昇流在紊流橫流狀況下與斜坡地形作用。紊流橫流係模擬海岸地區中性紊流邊界層流，以此迫近流場當做邊界條件。設計不同斜地形坡角度及溢漏排放源高度與溢漏排放強度(密度福祿數)，藉由量測濃度場變化結果分析探討濃度分佈之影響變化，以及沿下風距離之濃度水平向及垂直向剖面，據以分析獲致各種擴散參數之改變對於最大濃度與地面濃度及延散尺度之影響效應。 " "In the coastal chemical industry park and harbors of Taiwan, there have many chemical gases storage tanks. Among these tanks, there existed risks of gas leakage or explosion. These kinds of chemical gases or oil gases are usually heavier than air, and they are often called heavy gas or dense fluid. Most of heavy gases are toxic. As the heavy gas pollutants leakage, it may cause severe dangers and become environmental pollution. Therefore, it is necessary to understand and predict the diffusion and dispersion characteristics for heavy gas leakage. The purpose of the present project is to study the heavy gas dispersion by wind tunnel experiments. This can help to assess the risk analysis for heavy gas pollutants dispersion. Leakage of heavy gas forming the negative buoyant plume, and which encountering with obstacles (such as topography, fence, buildings, etc.) frequently occurred in coastal chemical industry park and harbors. Most of the wind flows in the coastal and harbor environments are turbulent. The spread of the negative buoyant plume of heavy gas is concerned for the purposes of assessing environmental protection and meeting requirement of the national environment regulation laws (like marine pollution law and air pollution law). Measurement study can provide valuable information for assessment of the environmental impacts on harbor region or coastal areas of industry parks in Taiwan. The project is to plan to perform wind tunnel measurements on dispersion characteristics of carbon dioxide heavy gas plume interacting with the topography which with upwind slope in a turbulent cross flow. A turbulent boundary layer flow will create as the turbulent cross flow. Different upwind slope angles of topography models will be arranged in the turbulent cross flow to study the heavy gas plume dispersion characteristics under such conditions. Heavy gas source discharge strength (densimetric Froude number), source height, and upwind slope angles of topography models will be adopted as systematic parameters for investigating their effects on the diffusion and dispersion of carbon dioxide heavy gas plume. Experiments will be conducted to measure flow and concentration fields. Data analysis will yield the dispersion characteristics (like the concentration profiles, variation of ground concentration, diffusion parameters, and dispersion length scales along with the downwind distance) of heavy gas plume under the interaction of the above mentioned different parameters. "

Keyword(s)

二氧化碳重質氣體
負浮昇羽昇流
密度福祿數
擴散參數
延散尺度
紊流邊界層
斜坡地形
carbon dioxide heavy gas
negative buoyant plume
densimetric Froude number
diffusion parameter
dispersion length scale
turbulent boundary layer
topography with upwind slope

DSpace CRIS

Experimental Measurement on the Pollution Dispersion of Negative Buoyant Heavy Gas Plume in the Topography with Upwind Slope

基本資料

Description