Numerical Simulation Of Aircraft Cabin Fire

In recent years,with the development of civil aviation industry,aircraft as a modern mainstream transportation has been accepted by the majority of the masses.At the same time,when people obtained the convenience of aircraft,they also suffered the accidents,which often lead to heavy personnel and economic losses.Among them,the cabin of the plane belongs to the special space of the narrow cavity,and the passengers will all be concentrated on it when they board the plane.Once the fire breaks out in the cabin,the narrow space will make the passengers move slowly in the escape.Moreover,the burning of fire is often accompanied by a lot of smoke,and passengers are most likely to suffer coma or death after inhaling excessive smoke,resulting in a clogging of narrow escape routes.It has greatly increased the death rate in the air accident of civil aviation passenger aircraft.In this paper,Boeing 737-700 aircraft cabin will be as the research object to have a research on the cabin fire environment under various working conditions by numerical simulation method.Firstly,based on the proposal of the Pyrosim software,a full-scale cabin modeling should be established by themethod of linear fitting of curved boundary with rectangular block.Then,the FDS software is used to simulate the model,which verifies the accuracy and applicability of the model,and provides a new method for the modeling of arc boundary.On this basis,the basic parameters of the aircraft cabin fire are set up,and the numerical simulation of the aircraft cabin fire model is carried out by using FDS software again,and analyzed the effects on cabin fire environment when open the different hatch doors under the different states of the aircraft after the forced landing.The results show that:(1)When the plane cabin is in a horizontal state of fire,its monitoring data basically show axisymmetric distribution.At that time,the doors should be opened as many as possible,so that the cabin smoke can be discharged to the externalities,thus reducing the overall smoke concentration in the cabin.At the same time,according to the analysis of various types of data at different heights,it can be seen that passengers in half-bending escape can greatly reduce the damage caused by the fire to the human body,which also can improve the efficiency of escape.In addition,in the early stage of the space layout design in aircraft,the appropriate addition of zoning baffles should be increased,which will help prevent the flow of smoke and heat transfer,and provide the enough escape time for passengers.(2)The main landing gear on the front side of the aircraft cannot work properly because of some factors.A fire broke out in a tilting state after the forced landing,and the smoke produces a chimney effect in the inclined environment of the cabin,which results in asymmetric distribution of monitoring data.During the evacuation process,the flight crew should guide passengers to choose the front door to escape,and at the same time,open the rear side of the hatch in time to release smoke,which will effectively reduce the overall smoke concentration and temperature in the cabin.Thus,it can effectively ameliorate the bad fire environment in the cabin.