Numerical Simulation On Particle Penetration Behavior In The Air Supply Duct Of High Speed Trains

With the increasingly serious air pollution,the research on the impact of particles on human health has attracted more attention.However,the research on particles in the field of high-speed trains is relatively few.The fresh air inlet of the train ventilation system is directly connected to the external environment.A amount of particles in the external environment will enter the car through the fresh air inlet of the train and the air supply duct,causing air pollution in the car.This paper studies the interception effect of the supply air duct on the particulate matter entering the cabin.Firstly,with the help of the commercial software GT-POWER,this paper takes CRH380 BL high-speed train intermediate car ventilation system and car as the research object,and establishes a 1D simulation platform that can simulate the working process of train ventilation system.At the same time,in order to determine the number of particulates intercepted by the air duct wall of the high-speed train intermediate car,the penetration rate of particulates in the pipeline was studied using 3D CFD technology,and the influencing factors of particulate deposition and the force of particulates were analyzed.In-depth analysis and study of the types of pipelines that constitute the train ventilation system,as well as the influence of pipeline geometric parameters and fluid velocity on the penetration rate of particulate matter,obtained the corresponding laws.Finally,with the help of the above 3D calculation results,the penetration rate of the particles in the pipeline is set in the 1D simulation platform.The author uses the established 1D simulation platform to calculate the mass flow of particulate matter flowing into the train compartment at different atmospheric particulate concentrations and different speeds,and obtains the mass flow rate of particulate matter in the fresh air outlet of the high-speed train and the train speed for the suspension of the flow into the train compartment.The influence law of the mass flow of particulate matter and the mass of particulate matter deposited in the supply air duct per unit time.The work done in this paper has laid the foundation for scientifically predicting and evaluating particulate pollution in high-speed trains under various meteorological conditions,as well as the formulation of pollution control measures.