Diffusion Simulation And Planning Control Of Particulate Matter In Residential Areas In Cold Region

Under the background of the process of national industrialization.the increase of energy consumption and the increase of vehicle ownership have caused serious air pollution.Especially in the urban residential space,as the region space which has many building communities and great population,the concentration of particulate pollutants is increasing rapidly near the building and pedestrian activity range.This greatly increases the harm of air pollution in the residential area,causing great harm to human health.Therefore,the prevention and control of particulate matter pollution has become one important subject in the process of urbanization in China.In order to study the diffusion law of particulate matter in the residential area,and propose targeted planning strategies based on the distribution of particulate matter in residential area,we select the typical residential area in Shenyang City as the research object.Combined urban planning and fluid mechanics,firstly,we analyzed the temporal and spatial distribution of the particulate matter in Shenyang City and its correlation with the meteorological factors such as humidity,wind speed and so on,by using the MATLAB software,according to the multi time and multi point date provided by Environmental Monitoring Center of Liaoning Province and the meteorological data provided by Shenyang Environmental Protection Bureau OF China.On this basis,CFD simulation technology was used to study the distribution law of air flow organization and the diffusion effect of particulate pollutant in residential area.And then,simulation analysis was carried out on the residential area model of different building space form,and discussed the best method for the evacuation of particles.Research results showed that,by adjusting the energy structure and enhancing pollution prevention,the air pollution of coal fired boiler in Shenyang City had been improved significantly.There was obvious seasonal difference in the mass concentration of the particulate matter,and in one day,the concentration of particulate matter concentration had obvious regularity,it could appear periodic peak and valley values.Under non precipitation conditions,the concentration of particulate matter was negatively correlated?with wind speed,and was positively correlated with relative humidity.The morphology of the residential area had a direct influence on the morphology of the local flow field,which had a great influence on the diffusion of the particles,adjusting the construction arrangement,changing the layout of the building space,maintaining the small angle between the building and the wind direction,can improve the wind environment in residential areas,and thus effectively promote the diffusion of particulate pollutants.Therefore,based on the analysis of the diffusion of the particles in the residential area,the research of planning and layout can reduce the pollution and improve the air quality of the city.