A Numerical Study On Air Quality In Enclosed Environments

Air distribution of the enclosed space (airlcraft cabin, car interior room, and manned spacecraft cabin, etc) will affect the air quality directly.This paper selects airplane cabin as the research object, the effects of CO₂ and benzene to the air quality that are mainly researced. By analyzing the flow field and the pollutant concentration field inside the cabin can provide a reference for the arrangement of air distribution, while can improve air quality in the enclosed spaces environments.The gaseous contaminant pollutants convection-diffusion,the flow field and the concentration field in the aircraft cabin are simulated by Lattice Boltzmann Method and Fluent software in this paper.First this paper validate LBM method and Fluent with the experimental data of the flow field and the gas concentration field from a classic case,and demonstrates LBM method and Fluent is reasonable for multicomponent convection and diffusion problem. The paper proposes a new lattice Boltzmann model that undependent the density distribution function and uses the new distribution function to simulate the concentration field.Then the validated Fluent is used to calculate the distributions of flow field and the concentration of gas contaminant in a section of Boeing 737 aircraft cabin with four different air distribution systems.Secondly,the gas contaminant pollutants convection-diffusion is calculated,the flow field and the concentration field in the aircraft cabin are simulated by lattice Boltzmann method and Fluent software in Boeing 737 aircraft cabin in this paper. Then the validated LBM method and Fluent are used to calculate the distributions of the air velocity,CO₂ concentration and c6h6 concentration in Boeing 737 aircraft cabin with the ceiling, luggage rack, ceiling and luggage rack and ceiling oblique air distribution systems respectively.Through the above four different air distribution systems analyzed and calculated, the ceiling oblique air distribution system can provide the best air quality. Finally compared the four flow fied and contaminant concentration field in the cabin, this paper concludes that the air distribution system with two skew inlets in the ceiling and two vertical inlets in the two racks is the most effective air distribution system.