Analysis of fuel leakage and diffusion characteristics and influencing factors in aircraft hangar
In order to effectively prevent major safety accidents caused by fuel leakage and diffusion in hangars,an experimental platform for fuel leakage and diffusion was established based on the spatial structure of a domestic hangar.The process of fuel leakage and diffusion is simulated by a simplified hangar model of equal scale reduction,and then the process of fuel leakage and diffusion is simulated by software based on the Standard K-e turbulence model+component transport model.The distribution law of oil and gas volume fraction in the process of fuel leakage and diffusion in the hangar and the influence of environmental factors are obtained by comparative analysis.The results show that the oil and gas diffusion speed is faster in the horizontal direction,and the stratification law is obvious in the vertical direction.After initial dilution,obstacle accumulation,gravity deposition and passive diffusion stage,the concentration equilibrium is achieved.Temperature,leakage location,and leakage amount have a significant influence on the volume fraction distribution of oil and gas in the hangar.With the increase in temperature,the maximum volume fraction of oil and gas in the simulated hangar space increases greatly.The leakage location mainly affects the time for oil and gas diffusion to reach the equilibrium volume fraction in space.The leakage volume has an effect on the maximum volume fraction of oil and gas in the space,the equilibrium volume fraction of oil and gas,and the time to reach the equilibrium volume fraction,but has little effect on the production rate of oil and gas.The disturbance of oil and gas diffusion caused by obstacle factors in the hangar and the secondary acceleration phenomenon after oil and gas accumulation makes the turbulence intensity in the hangar increase sharply,resulting in the continuous expansion of the dangerous oil and gas volume fraction area.
NETL
NSTL
万方数据
维普
