Numerical Simulation of the Effect of Air Supply Modes on CO2 Transmission and Ventilation Performance in Civil Aircraft Cabin
The computational fluid dynamics method was used to construct the numerical model of the 7-row of A320 economy class,and the CFD model was validated.Numerical simulations were conducted for three air supply modes:ceiling ventilation,mixing ventilation and displacement ventilation,and CO2 was used as a pollutant to compare and analyze cabin ventilation performance and discharge efficiency.It is found that ceiling ventilation will make middle passengers feel more windy,and the vertical temperature difference of passengers is about 3K;the velocity field and temperature field of mixing ventilation are evenly distributed,and the thermal comfort is good.In the displacement ventilation,the surrounding speed of passengers is less than 0.3m/s,there is temperature stratification,and airflow movement is significantly influenced by the plume of human body.In terms of the discharge efficiency,displacement ventilation will make the accumulation of CO2 around passengers longer,and the average concentration in breathing zone is about 35%higher,the discharge efficiency of ceiling ventilation and mixing ventilation is similar.Compared with the traditional air supply modes,the discharge efficiency of displacement ventilation is improved by about 42.8%,which is suitable for the optimization of ventilation structure of the aircraft.
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