Study On The Dispersion Disciplinarian And Decontamination Of Automobile Exhaust NO₂ In Street

With the development of our country's urbanization and industrialization, air pollution problem in the city has attracted more and more in many research areas. At present, the NO₂ exhausted by vehicle is considered the main source of the city air photochemical smog. Among multitudinous measures on curing and degenerating automobile exhaust, many experts and the scholars took the photochemical catalysis material as a new measure to degenerate automobile exhaust in atmosphere. This paper took the NO₂ exhausted by vehicle as the main research object, based on turbulent flow numerical simulation elementary theory, selected FLUENT software to simulation a series of natural environment that influenced the diffusion of the NO₂ exhausted by vehicle in city street. Through outdoor monitors, applying many kinds of mathematic measures, such as the theory of probability and statistics, fuzzy set, fuzzy clustering and principal component factor selection, researched the sampling time and spot. On the basis of the outside sampling, using indoor experiment to simulate the natural state of the air in the city street, researched the effect of photochemical catalysis material purifying the NO₂ exhausted by vehicle in the city street, researched the influence of all kinds of factors.At last, got following conclusions:(1) Meteorology and geographic factors, such as the wind speeds, wind direction, temperature, building highly and the distance of pollution source, obviously influenced the diffusion of the pollutant exhaust by vehicle. (2) Through the monitor of Hexing road of Haerbin, on the basis of applying the theory of probability and statistics, fuzzy set, fuzzy clustering and principal component factor selected, established a set of models on urban road pollutant sampling time and the sampling points, and got satisfied results through proved by instance. (3) On the basis of sampling, using the indoor experiment to simulates the air environment of the city street, researched the effect of photochemical catalysis material purifies the NO₂ exhausted by vehicle in the city street. The experiment proved that many factors, such as the light intensity, temperature and humidity had tremendous influence function on photochemical catalysis material purifies the NO₂ exhausted by vehicle.