Research On The Contaminants Diffusion In The Large Commercial Aircraft Cabin

When aircraft is flying in the atmosphere, the external environment is facing the poor low pressure conditions, and the environment inside the aircraft is also a fiasco. Good aircraft environmental control systems can not only solve this problem, but also provide a suitable environment for the reliable operation of equipments and safety of cabin crew and passengers.In order to prevent people from the contamination in the cabin, in this paper, using FLUENT software to simulate the regular of the flow in the closed, then chose a best simulation model for turbulent velocity field by comparing three simulation models. Using the selected model simulate the environmental contaminants in a heat source condition, so it can verify the model' ability of simulation temperature and concentration. Finally, the validated model simulates the propagation of internal contamination in the aircraft cabin.Based on the research, the conclusions are as follows:This paper use standard k-? model, RNG k-? model and realized k-? model three kinds of turbulence model to simulate the flow field enclosed square cavity tissue, by comparing the model center section of the cloud and vector flow field and the center section of the horizontal and vertical center line of the center line speed value, determine the most appropriate RNG model simulation flow velocity field within an enclosed space.This paper use RNG k-? model, the multi-component gas model to simulate pollutant concentration field offices, by comparing the simulated and experimental values? ?, indicating that the simulation results with the experimental values? ?coincide RNG model to simulate pollutant concentration field.Research sidewalls are outlet air, ceiling and sidewall air outlet- a common air supply three air supply ceiling, by contrast, the cabin airflow velocity, pollutant concentration field and cabin temperature field, gas pollutants propagation of the flow field with the cockpit, as well as the concentration of pollutants in the way the intake. Sidewall- a ceiling outlet joint air, the concentration of pollutants in the breathing zone of the smallest cabin. In the same kind of air, the concentration of pollutants in the breathing zone of the seat near the middle of the cabin near the wall is lower than the concentration of pollutants in the breathing zoneof the seat.In this paper, the proliferation of large aircraft under different cabin ventilation of carbon dioxide numerical simulation study, only single indicator of carbon dioxide, the sidewall- ceiling air outlet common form of superior sidewall and ceiling air blast. For cabin ventilation for the future airworthiness compliance verification and system design provides the basis.