發(fā)布時(shí)間：2018-01-04 05:03

  本文關(guān)鍵詞：校區(qū)二氧化硫擴(kuò)散數(shù)值仿真研究　出處：《內(nèi)蒙古大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 流體 污染物 擴(kuò)散 數(shù)值模擬

【摘要】：目前我國(guó)環(huán)境污染日益嚴(yán)重,國(guó)家正在加快工業(yè)轉(zhuǎn)型升級(jí)的腳步,工業(yè)污染物的排放直接影響生活環(huán)境的空氣質(zhì)量與身體健康。長(zhǎng)期生活在氣體污染物擴(kuò)散嚴(yán)重的環(huán)境中將會(huì)對(duì)人體造成嚴(yán)重?fù)p害。學(xué)校校區(qū)是學(xué)生學(xué)習(xí)生活的主要場(chǎng)所,學(xué)生的學(xué)習(xí)與生活環(huán)境一直是社會(huì)關(guān)注的焦點(diǎn),所以研究學(xué)校周邊污染物在校區(qū)內(nèi)的擴(kuò)散狀況對(duì)學(xué)校建設(shè)以及污染源的遷移有現(xiàn)實(shí)指導(dǎo)意義。本文利用計(jì)算流體力學(xué)CFD(Computational Fluid Dynamics)方法,以假想學(xué)校校區(qū)為研究對(duì)象,建立了物理模型和數(shù)學(xué)模型,通過數(shù)值模擬的方法對(duì)該學(xué)校校區(qū)氣流流動(dòng)以及校區(qū)內(nèi)污染物的擴(kuò)散情況進(jìn)行三維模擬計(jì)算,其中以二氧化硫?yàn)橹饕廴疚?分析學(xué)校內(nèi)不同風(fēng)向時(shí)的流場(chǎng)變化以及污染物的擴(kuò)散情況。模擬結(jié)果表明:首先,不同風(fēng)向時(shí),通過對(duì)溫度場(chǎng)和濃度場(chǎng)的分析,得到建筑物和人們活動(dòng)的地面附近的污染物分布:污染源擴(kuò)散主要是在建筑物外的上空進(jìn)行擴(kuò)散,在上空的水平面內(nèi),沿著主導(dǎo)風(fēng)向濃度逐漸減小,而在校區(qū)內(nèi),由于受到建筑物的遮擋作用,污染物會(huì)在建筑物的背風(fēng)側(cè)形成富集區(qū)域。其次,濃度高低取決于該點(diǎn)所處的具體位置,在不同高度水平區(qū)域內(nèi)不同模擬點(diǎn)處的濃度是不同的,在低于建筑物污染物的擴(kuò)散在很大程度上受到建筑物的影響。隨著高度的升高,流場(chǎng)受到的建筑物的影響逐漸弱化,但是高于建筑物一定距離的流場(chǎng)還是要受到建筑物的影響,從而導(dǎo)致風(fēng)向改變。風(fēng)會(huì)沿著建筑物的頂部角緣向上攀升,流速逐漸增大。污染物隨著主導(dǎo)風(fēng)向越過建筑物之后,主要通過建筑物頂部擴(kuò)散,在其背面出現(xiàn)回流。
[Abstract]:At present, the environmental pollution in our country is becoming more and more serious, and the country is speeding up the pace of industrial transformation and upgrading. The emission of industrial pollutants directly affects the air quality and health of the living environment. The long-term living in the environment of serious diffusion of gas pollutants will cause serious damage to the human body. The school campus is the main learning life of students. I need a place. The study and living environment of students has always been the focus of attention of the society. Therefore, it is of practical significance to study the diffusion of pollutants around the school in the school area. In this paper, we use computational fluid dynamics (CFD) (CFDs) for the construction of schools and the transport of pollution sources. The Computational Fluid dynamics method. Taking the hypothetical school campus as the research object, the physical model and the mathematical model are established, and the air flow and the dispersion of pollutants in the campus are simulated by numerical simulation method. With sulfur dioxide as the main pollutant, the flow field change and pollutant diffusion in different wind direction are analyzed. The simulation results show that: first, through the analysis of temperature field and concentration field under different wind direction. The distribution of pollutants near the buildings and the ground where people are active is obtained: the pollutant source diffusion is mainly carried out over the building, and the concentration decreases gradually along the dominant wind direction in the horizontal plane above the building. However, in the campus, due to the blocking effect of the building, the pollutants will form enrichment area on the leeward side of the building. Secondly, the concentration level depends on the specific location of the point. The concentrations at different simulation points are different in different height areas, and the diffusion of pollutants below buildings is largely affected by buildings. The flow field is gradually weakened by the influence of the building, but the flow field above a certain distance of the building is still affected by the building, which leads to the change of the wind direction. The wind will climb up along the top corner edge of the building. With the dominant wind direction passing over the building, the contaminants diffused mainly through the top of the building, and reflux appeared on the back of the building.
【學(xué)位授予單位】：內(nèi)蒙古大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：X169;X511

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