Evaluation of the level of air pollution in emergency situation on railway transport

Abstract

Purpose. The development of numerical models for the prediction of air pollution by burning solid propellant in a railway carriage, which is located near the building on railway territory.

Methodology. For the numerical simulations of pollutant transport use implicit change triangle difference schemes. To solve this problem developed numerical models based on the use of Navier-Stokes equations, to determine the velocity field of the wind flow near the cars and buildings, transport equation impurities in the atmosphere. When constructing a difference scheme is carried out physical and geometric splitting of the transport equation in the four steps. Unknown value pollutant concentration at each step of cleavage is determined by the explicit scheme.

Findings. Numerical models are used for production of various settlement scenarios emergency and diagnostic intensity of pollution. Computational calculations are made to determine the concentration of the pollutant and the formation of the zone of air pollution on a scale «microscale» and «local»

Originality. Created numerical models to take into account relevant factors influencing the process of dispersion of pollutants in the atmosphere. Practical value. Efficiency of numerical models «diagnostic models» for the express calculation of the level of air pollution in emergency situations in the case of transport by rail of solid rocket propellant. Models can be used in the development of PLAS. The proposed model allows to calculate the hydrodynamics of the 2D wind flow and mass transfer process of hazardous substances in the atmosphere.