Numerical Simulation Of PM2.5 Concentration Distribution In The Changing Room Of Gymnasium

PM2.5 has become one of the major pollutants harmful to human health and is a hot issue in many related fields.Many scholars have studied the transmission process of indoor and outdoor particulate matter pollution and the influence of air conditioning systems on indoor particulate matter concentration.However,most of the indoor pollution sources in previous studies were some of the more targeted behaviors such as smoking and cooking.The pollutants emitted by the personnel themselves were not studied.This article takes this as a breakthrough point,with the background of the upcoming Winter Olympics,combined with the frequent movement of people in the locker room,and the more obvious characteristics of the particles emitted by the athletes after training,the athletes in the locker room in the stadium Exposure characteristics.Due to the difficult control of the experimental environment and factors,this paper mainly uses the numerical simulation method to simulate the PM2.5 concentration distribution in the locker room.From the simulation results,we can understand the different air supply modes,air supply speed and indoor PM2.5 under different numbers of people concentration distribution,the final analysis and proposed effective measures to reduce the concentration of pollutants to ensure the physical and mental health of indoor personnel.First of all,this paper summarizes the status of particulate matter pollution at home and abroad and related research status.At the same time,the formation,hazard,main source of indoor particulate matter and the process of affecting the concentration of indoor particulate matter are introduced.Then,the theoretical analysis of the numerical simulation of this paper is carried out.The discrete phase model(DPM model)is used to simulate the airflow and particle orbit of the three-dimensional dressing room.The results show:(1)this paper simulates three different air supply modes: same side up and down,different side up and down,and different side up and up.The results show that the lowest indoor PM2.5 average concentration is in the form of up and up,the lower is in the form of up and down,and the higher is in the form of up and down.(2)Under the influence of different wind speeds,the greater the wind speed,the more obvious the indoor flow field is,and the more likely the velocity stratification is.The larger the particle is affected by the Saffman lift,the higher the particulate matter,which leads to the increase of the average PM2.5 concentration.(3)When the number of people in the room is different,the concentration of PM2.5 does not increase in a positive correlation due to the influence of air conditioning and air supply in the room.The particle phase interacts with the air flow field.When the particulate matter reaches a certain amount,a large amount of particulate matter exacerbates the flow of indoor air,which in turn causes the internal flow field to form a kind of driving on the particulate matter,which accelerates the movement of the particulate matter and is easier to move toward.The return air outlet is discharged,and finally the average concentration of PM2.5 in the room is lowered.Finally,some simulation solutions can be proposed to improve the indoor air quality of the locker room: some dead corners such as the corners of the particulate matter can be cleaned and cleaned to reduce the particles at the highest concentration;when there is a person in the room,the wind speed can be adjusted.It is conducive to the discharge of pollutants emitted from the human body;the place where the clothes are changed in the dressing room should be selected as close as possible to the side of the return air outlet,so that the pollutants emitted by the personnel when changing the clothes are favorable for discharging from the return air outlet.