Simulation Study on Aerosol Diffusion of Bioterrorism Factors in Port Passenger Station

Among the bioterrorism threat factors, airborne bacteria or viruses are more harmful, and exist in the form of aerosols in port passenger stations, which have the characteristics of transmitting viruses, the characteristics of aerosol diffusion in indoor space are of great significance for preventing bioterrorism events. Under the conditions of micro-negative pressure at the bottom of the space in the passenger station, natural ventilation with doors and windows open on one side, mechanical ventilation with top air supply on one side, etc., the Realizable k-ε turbulence model was used to study the transient diffusion. The temperature of human body is higher than the indoor environment temperature, the phenomenon of thermal plume will appear near the body surface, the local airflow disturbance aerosol particles will move down with the circulation, there will be reflux vortex, at 60 seconds, the residual rate of particulate matter is 15% in the bottom micro-negative pressure ventilation, 20% in the door-window one-side natural ventilation, and 30% in the top-supply one-side exhaust mechanical ventilation, when people are indoors, the use of low-negative-pressure ventilation is conducive to the reduction of aerosol particles.