Research On The Influence Of Aircraft Emissions On PM2.5 In Airport Regional Environment

PM2.5 have a serious impact on human health,life and production activities.In order to minimize the influence of PM2.5,how to effectively control the PM2.5 produced by human beings and promote its dispersion has become an important issue in China's environmental protection.A certain amount of PM2.5 can be generated by Aircraft operations at large busy airport.At present,research on the generation of PM2.5 produced by aircraft,especially its influence on the airport regional environment,is still in its infancy.Due to the lack of research,PM2.5 produced by aircraft doesn't be involved in environmental assessment of airport construction project and airport environmental management.Carrying out relevant explorations has important value and significance for effectively controlling the influence of PM2.5 in the airport area.Firstly,the formation mechanism of primary and secondary PM2.5 producted by aircraft and the aircraft emissions are analysed.Secondly,this paper establishes the time-use model of each stage in the standard LTO process by means of aerodynamic theory,and it is used to establish the aircraft emission model.By analyzing the characteristics of aircraft motion and the law of atmospheric dispersion,using the probability density function of binary normal distribution,the aircraft dispersion model is established.The vertical dispersion correction formula of concentration is obtained according to the turbulent diffusion theory.The above work set a theoretical foundation for the calculation of emissions and dispersion of PM2.5 at the airport.Thirdly,according to the infrastructure(runway,taxiway and apron,etc.)and the aircraft operation informations of Shanghai Hongqiao Airport,using the emission and dispersion model established,with the aid of EDMS software,PM2.5 produced by the aircraft in various processes of LTO is calculated.The concentration and dispersion data of sensitive points around the airport are calculated and analyzed.The concentration distribution of PM2.5,NO_x and SO_x in the surrounding area of the airport are plotted,and the distribution characteristics,laws and causes are analysed.Fourthly,the measures to reduce the influence of PM2.5 producted by aircraft are studied from three aspects:airport site selection,ground operation and flight procedures.In terms of site selection,the analytic hierarchy process is used to construct a site meteorological condition evaluation system based on PM2.5 dispersion.In the airport operation,PM2.5 can be effectively reduced by increasing the taxiway,taxi path optimization and adjusting the type of aircraft.In the flight procedure optimization,the adjustment of the slip angle,time of descent phase and using Take Off Reduced Thrust can significantly reduce PM2.5 emission.