预混气体在多孔介质中燃烧火焰面倾斜的演变

为研究多孔介质中火焰面倾斜演变及出现倾斜演变的原因，建立了二维碳化硅堆积小球的多孔介质燃烧器双温模型，对预混气体在燃烧器内的流动、传热和燃烧进行模拟.分析火焰面倾斜演变，并从温度场、气体流速场、压力场三个方面对火焰面出现倾斜演变现象进行分析.结果表明:给定初始倾斜角的火焰面会持续发展，出现更严重的倾斜现象；温度场、气体流速场、动压场通过影响燃烧化学反应速度、气体流动方向、壁面散热等间接影响火焰面的倾斜演变，导致火焰面倾斜的持续发展.

Evolution of Flame Inclination of Filtration Combustion in Porous Media

In order to study the evolution of inclinational flame during propagation of a filtration combustion wave in porous media and the causes of the evolution, a two-temperature and two-dimensional numerical model was established. A 500 mm-long quartz tube with 40 mm in diameter was used as the burner model which was filled with grained carborundum (SiC). The software Fluent was used to simulate the combustion, fluid flow and heat transfer of filtration combustion. The evolution of inclinational flame and the reasons causing this evolution were analyzed from three aspects of temperature field, gas velocity field and pressure field, respectively. Temperature field, gas velocity field and pressure field can affect the chemical reaction rate, the direction of gas flow and heat loss at the walls, etc., and further can affect the evolution of inclinational flame. These factors can advance the continuous development of the inclination. The results show that, if an initial inclination is set, the inclination of flame will progress and become more serious.