【摘要】 建立了微重力条件下火焰传播的三维非稳态计算模型。固体可燃物假定为可热解的纤维素薄片。气相模型包括考虑密度和压力变化的Ｎａｖｉｅｒ－Ｓｔｏｋｅｓ方程，并且用六通量模型计算辐射传热。固相模型中连续性方程和能量方程的解为气相控制方程组提供相界面处的边界条件。数值方法中，分别对气相和固相方程组进行迭代耦合求解。用数值模拟的方法预估了不同微重力水平条件下重力加速度方向平行于可燃物表面方向时的竖板火蔓延过程，结果表明微重力水平对竖板表面的火焰传播过程有显著影响。更多还原

【Abstract】 A computational model of three-dimensional,time-dependent flame spread in microgravity environment was proposed.The solid is assumed to be a thermally-thin,pyrolysing cellulosic sheet.The gas phase model includes the full Navier-Stokes equations concerning density and pressure variations and six-flux model was used to calculate radiation heat transfer.In the numerical procedure,the gas-phase and solid-phase equations were solved separately and iteratively at each time step.Predictions were made of flame spread over a vertical wall under different gravity levels with gravitational acceleration parallel to the fuel surface.The numerical simulation results show that the level of microgravity has a significant effect on the flame spread process.更多还原