Study On External Fire Arrestiontechnology Of Fuel Vent System

The study of external fire arrestion technology of fuel vent system refers to theinhibition mechanism and key technology ofairborne flame arresters. Its main objective is to design, develop and install an appropriate airborne flame arrester which could prevent the flame propagation and spread in the vent system casued by the ignition source. Consequenntly, the burning and explosion ofthe fuel tank can be avoidedOn the basis of the summuriazation of the research progress understanding of design and calculating method of feature size of the flame arrestor, the design and calculation of fire retardance element feature sizes of a flame arrestor for XX aircraft fuel ventilation system is conducted; Furthermore,three-dimensional numerical simulation model is set up and solved to discusses the relationship between the flame arrestor element feature sizes and flow resistance, temperature change rule, the time of fire retardance.The main works and results are:1.The flame arresters element feature sizes design method and calculation formula are systematically summarized;2. According to the task of designing the flame arrester for XX aircraft ventilation system, the foreign literature about the lightning ignition experiment results is referenced to, the preliminarily design of fire retardance element feature size of the airborne flame arresters is accomplished;3.In view of the burning resistance performance of airborne flame arresters, introduced based on the local thermal equilibrium model of double equation, in view of unsteady heat conduction to study the temperature of fire retardance element dynamic evolution rule on the condition of flame burning, and by comparing with the relevant literature analysis, the validity of the model is proved.The influence of the flame velocity, porosity, the length of flame arrestor element, gas combustion temperature on the dynamic evolution of temperature of end of fire retardance element is discussed;4, The flame arrestorelement pressure drop calculation formula is deduced to draw up the pressure change drop curve on the condition ofthe air flow and fuel overflow,andthe influence factors of pressure drop is analyzed.The results can provide a theoretical basis for the research and development of domestic airborne flame arresters.