Study On The Transmission Rules Of Respiratory Pathogens In Aircraft Cabin

With the rapid development of civil aviation,aircraft has become an important travel tool in our life.However,due to the small and confined aircrafts cabin,once a respiratory pathogen infection accident occurs,it will pose a great threat to the health of passengers.Therefore,it is very important to study the transmission rules of respiratory pathogens in the cabin,assess the risk of passengers’infection,and summarize measures to reduce the risk of passengers’infection.Thus,a healthy flight environment can be provided to passengersIn thesis,a CFD（Computational Fluid Dynamics）simulation model of a civil aircraft cabin was built,and the rationality of the simulation model was verified by real experimental cabin.Based on the reasonable cabin model,the transmission rules of respiratory pathogens were revealed by the concentration distribution and movement trajectory.At the same time,the movement of objects in the cabin can affect the transmission rules of respiratory pathogens.The effect of object movement on the transmission rules of respiratory pathogens was studied by simulating the movement of the dining car by flight crewsFirstly,based on a reasonable aircraft cabin model,N₂O was used as a tracer gas instead of respiratory pathogens to simulate the spread of respiratory pathogens released by sick passengers in the aircraft cabin,and the dynamic transmission process was revealed by the concentration distribution of respiratory pathogens.Using SEI（Susceptible Exposure Index）as the evaluation index,the seat with the minimum infection risk is obtained per simulation data by changing the seats of sick passengers.And it analyses the highest infection risk of the remaining passengers when the sick passengers are at certain seats.Then,considering the transmission carrier of respiratory pathogens is the droplet,the DPM（Discrete Phase Model）is used to simulate the dynamic transmission process and movement trajectory of droplets containing respiratory pathogens in the cabin.The wells-riley model was used to evaluate the risk of infection among passengers.By changing the seats of sick passengers and the air supply volume in the aircraft cabin,the ventilation volume and the seat position of the sick passengers were analyzed to minimize the risk of infection of the remaining passengers.Finally,the first two parts of the study are in the steady state of the cabin flow to study the spread of respiratory pathogens.However,the movement of objects in the cabin will cause local airflow in the cabin to be in an unstable state,which will change the transmission rules of respiratory pathogens.Therefore,based on the moving mesh technique,the influence of the moving dining car on the transmission rules of respiratory pathogens was studied.The results show that when the passenger sit in the aisle position and the dining car does not move,the spread of respiratory pathogens within the range is only 1 row.When the dining car moves,it can make the respiratory tract pathogen spread to 5 rows,increasing its transmission range and the infection risk of passengers.