价值工程
價值工程
개치공정
VALUE ENGINEERING
2015年
27期
196-198,199
,共4页
PM2.5%地面连续扩散模型%发生与演变
PM2.5%地麵連續擴散模型%髮生與縯變
PM2.5%지면련속확산모형%발생여연변
PM2.5%ground continuous diffusion model%occurrence and evolution
应用数学建模方法对西安市空气中PM2.5的发生和演变进行合理性评估，对于建立城市污染物风险评估有着重要价值。本文应用地面连续点源扩散微分方程。对固定强度点源，在一定风速、温湿度条件下，湍流运动进行模拟后得到微分方程以及连续点源恒定条件下解析解。在水平风向平均风速为2.5m/s的条件下持续进行两小时，污染物浓度分布急剧下降，扩散效果最好且污染的扩散随风向呈椭圆形分布。
應用數學建模方法對西安市空氣中PM2.5的髮生和縯變進行閤理性評估，對于建立城市汙染物風險評估有著重要價值。本文應用地麵連續點源擴散微分方程。對固定彊度點源，在一定風速、溫濕度條件下，湍流運動進行模擬後得到微分方程以及連續點源恆定條件下解析解。在水平風嚮平均風速為2.5m/s的條件下持續進行兩小時，汙染物濃度分佈急劇下降，擴散效果最好且汙染的擴散隨風嚮呈橢圓形分佈。
응용수학건모방법대서안시공기중PM2.5적발생화연변진행합이성평고，대우건립성시오염물풍험평고유착중요개치。본문응용지면련속점원확산미분방정。대고정강도점원，재일정풍속、온습도조건하，단류운동진행모의후득도미분방정이급련속점원항정조건하해석해。재수평풍향평균풍속위2.5m/s적조건하지속진행량소시，오염물농도분포급극하강，확산효과최호차오염적확산수풍향정타원형분포。
Mathematical modeling method is used for reasonable evaluation for the occurrence and evolution of PM2.5 in the air in Xi’an City. It is important for establishing urban pollutants risk evaluation. The ground continuous point source diffusion differential equation is applied in this article. After the simulation of the turbulent motion of fixed strength point sources under the condition of a certain windspeed, temperature and humidity, the differential equation is obtained, and theanalytic solution under the condition of constant continuous point source isalso obtained. When it lasts 2 hours under the condition that the averagehorizontal wind speed is 2.5m/s, there is a sharp drop in pollutant concentration distribution. The diffusion effect is the best and pollution diffusion comes into oval distribution with the wind direction.
