Research On The Effect Of The Surrounding Flow Field And The Propagation Of Contaminants Under Movement Disturbance By A Single Queue Of Personnel

With the rapid development of China’s economy and the continuous improvement of people’s living standards,people travel more and more frequently,and in the smoke of the epidemic just cleared today,there are still a variety of respiratory infectious diseases threatening people’s health.Airports,subway stations and other large transportation hubs are relatively crowded,especially in the transfer corridors and other areas with small spaces.Largescale movement of people can lead to large-scale transmission of infectious diseases,and the movement of people can complicate the transmission of infectious viruses,so there is an urgent need for in-depth research on people movement.In existing studies,people movement has been studied only in the case of single person movement,but not in the case of tandem movement of people in narrow passages.Therefore,this study is aimed at the scientific research of the tandem personnel movement,and the main object of the study is the change of the surrounding flow field under the tandem personnel movement disturbance and the propagation law of respiratory pollutants.In this study,experimental and numerical simulations are carried out for a single train of personnel movement with velocities of v=1 m/s and v=0.5 m/s,respectively.Among them,the experimental aspect built a 1:8 scaled-down model experimental stage for a single column of 6people walking,and used reasonable experimental methods,including the use of high-precision measurement instruments,for the arrangement of measurement points,and the control of the experimental environment,to conduct the experimental study.Numerical simulations were performed using three different turbulence models,RNG k-ε,SST k-ω and LES,to simulate the walking process of a single column of people,and the experimental results were used for calibration,and the results show that the two-equation RNG k-\varepsilon turbulence model is better calibrated with the experiments,and the simulation results can more realistically and accurately restore the human The simulation results can more realistically and accurately reproduce the changes of the surrounding flow field and the propagation law of respiratory pollutants under the motion disturbance.The results show that the distribution characteristics of the surrounding flow field and respiratory pollutants during the movement of personnel are independent of the movement speed of personnel,and the movement speed only changes the flow velocity and the pollutant concentration.The greater the personnel movement speed,the greater the flow velocity of the peripheral flow field and the longer the wake,while the propagation range and concentration size of respiratory pollutants decrease with the increase of personnel movement speed.In addition,when analyzing the exposure risk of pollutants in different areas,the concept of average exposure of pollutants is proposed so that the exposure risk can be visualized in the form of specific values.