微重力下密闭腔体内火焰传播过程的数值模拟

NUMERICAL SIMULATION OF FLAME SPREADING IN AN ENCLOSED CHAMBER UNDER MICROGRMITY

建立了微重力条件下火焰沿固体可燃物表面蔓延的数学模型．在考虑固相传热和热解过程的基础上，研究气相的燃烧动力学过程，并且给出了体现微重力燃烧两相耦合作用的相界面处理方法．首次用数值模拟的方法研究了密闭腔体内火焰传播的三维非稳态过程，对于微重力大小分别为１０－４ｇ和１０－２ｇ时的计算结果进行了分析对比．数值模拟的结果基本合理．

A computational model of flame spread down a thermally thin solid combustible in microgravity environment has been proposed in this paper. Based on the solid fuel heat transfer and pyrolysis processes, the gas-phase combustion kinetics processes have been studied, and the mathematical treatment of interfacial coupling has been given here. The three--dimensional ullsteady processes of flame spreading in an enclosed chamber have been studied with numercial methods for the first time. The gravitional accelerations of 10￣(-4)g and 10￣(-2)g are utilized in the calculations for comparative analysis. The results are basically reasonable.