Research On The Air Quality And Flow Field Distribution In The Resident District Of ShenYang

The environmental air pollution problem has already caused people’s more and more attention, it also became the focus of many research fields with increasing in urbanization in China. Research shows that:at present, automobile emission pollutant is believed as the main air pollution source in the urban environment in current days, it is identified that the automobile exhaust discharges mainly concentrated in the breathing zone nearby, and long term exposed to this situation will do harm to people’s health. And the resident district is the main place for people’s living and leisure, to research the pollutant dispersion in the resident district is of great realistic significance.Based on the computational fluid dynamics CFD software FLUENT, a high-rise residential district in shenyang city was taken as the research object of numerical simulation and monitoring. the establishment of a physical and mathematical model for the residential area in winter and summer conditions outdoor wind environmental condition and pollutant concentration diffusion3d computer numerical simulation analysis, the lane in the exhaust gas of gaseous pollutants carbon monoxide and nitrogen oxides and fine particles PM2.5as the main pollution sources. The simulation results show that:(1)Different architectural layout of residential district decided the wind field. Throughthe adjustment of the layout of the building mode can improve the residential district ofwind environment. The wind speed is significantly reduced within the cell,at this time the outdoor air is the best, especially when the height of the windward side of the building is reduced and enlargement of the joint action of the distance of the cell entrance. through the analysis of the wind field, it can be seen that the negative pressure and swirl in the building leeward side is not conducive to the spread of pollutants, the planning of the layout of the building should be to avoid pollution sources exist here;(2)Pollutant concentration distribution characteristics:the spread of pollutants by the distribution of the impact of wind field around the buildings, and closely related to the concentration of pollutants distribution and construction layout. Residential area of the original layout, the higher thewind speed within the district, the pollutants spread winder, lower concentration,the pollutants are not exceeded; When only reduce the windward side of the building height,the district of the entrance and whirlpool at the wind speed is significantly reduced, the dilution effect of the natural wind weakened pollutants gathered, compared with the original layout, the concentration of pollutants within the district,,at the source and the entrance have the phenomenon of excessive; when the height of the building on the windward side and in the channel are lowered, the highest concentration of pollutants, layout the seriously overweight phenomenon under nitric oxide and PM2.5concentration;On above analysis:for ShenYang regions, the reasonable arrangements of the height of the location and construction of buildings in the residential district.To increase the height of the building on the windward side and in the channel, which can effectively reduce the concentration of pollutants in the district, the air quality of the residential area is better, conducive personnel living.With visual image and visual results show the residential district of the flow field distribution, automobile exhaust pollutant simulation also basically reflected in this residential area pollutant concentration change feature, the result of numerical simulation for community building layout design and inside the village air quality evaluation to have the certain reference value.