Simulation of Flashover Conditions in Passenger Vehicles
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摘要: 基于能量平衡方程建立了热烟气层轰燃模型,经量纲归一化和微分同胚变换,得到属于燕尾突变的势函数.研究了客运车辆火灾的系统控制变量和工况条件的关系.控制变量的突变分叉集空间将火灾分为轰燃区和非轰燃区.在轰然区,可利用势函数的特性曲线和微商图得出火灾的不稳定点,再由不稳定点取值计算轰燃发生时热烟气层的温度.车辆火灾算例表明,车厢内部发生轰燃时的热烟气层平均温度为898.3 K,与实测的数值吻合较好.Abstract: A flashover model of high temperature smoke layer was derived based on energy conservation functions.A catastrophe potential function,which has the same form of swallowtail catastrophe,was obtained by dimensional normalization and diffeomorphism.The relationship between system control variables and burning conditions of fires in a passenger vehicle was studied.The catastrophe bifurcation of the control variables divide a fire into flashover zone and non-flashover one.In the flashover zone,an unstable point can be obtained from the characteristic curve and differential coefficient curve of the potential function.The temperature of high temperature smoke layer for a flashover to occur is then calculated from the unstable point.A calculation case shows that the temperature of high temperature smoke layer is 898.3 K when flashover occurs in a passenger vehicle,which agrees reasonably well with experimental results.
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Key words:
- passenger vehicle /
- fire /
- swallowtail catastrophe /
- flashover /
- simulation
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