Effect of Fuel Inject Angle on the Thermal Behavior of a 2D Axisymmetric Non-Premixed Methane-Air Flame in Vertical Cylinder Filled by Porous Media

M. Y. A. Jamalabadi, Moein Rajabzadeh, P. Hooshmand
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引用次数: 5

Abstract

The present manuscript is dedicated to the study of non-premixed combustion within a vertical cylinder filled by inert porous media using a turbulence model. A study of the effect of inlet gas angle on methane/air combustion is performed. Governing equations of Navier-Stokes, energy and the chemical species transport equations in a porous media with local thermal nonequilibrium assumption between the solid and fluid are solved. Distinct energy equations are considered for the porous burner and the fuel in it. Inlet velocity and excess air-to-fuel ratio are varied in order to analyze their effects on temperature, turbulent kinetic energy distribution and flame front location. The temperature field and species concentrations are presented in the premixed methane air combustion. The results show that an increase in angle of inlet gas enhances the mixing rate, the peak temperature, and water and carbon dioxide volume fraction inside the middle region of the chamber. The locations of the maximum temperature and product concentration shift closer to the combustor inlet with an increase in inlet angle. Furthermore, the temperature in porous burners is lower than free flame burners, and lower NOx and CO pollutant are achieved. KeywordsMethane/Air Flame; Turbulent Model; Numerical Simulations; Non-Premixed; Porous Media
喷油角度对多孔介质填充的二维轴对称非预混甲烷-空气火焰热行为的影响
目前的手稿是专门研究非预混燃烧在一个垂直圆柱体充满惰性多孔介质使用湍流模型。研究了进气角度对甲烷/空气燃烧的影响。在固流局部热不平衡假设下,求解了多孔介质中的Navier-Stokes控制方程、能量输运方程和化学物质输运方程。考虑了多孔燃烧器及其燃料的不同能量方程。通过对入口速度和过剩气燃比的变化,分析了它们对温度、湍流动能分布和火焰前缘位置的影响。给出了预混甲烷空气燃烧过程中的温度场和物质浓度。结果表明:随着进气角度的增大,混合速率、峰值温度以及腔室中部的水和二氧化碳体积分数均有所提高;随着进口角的增大,最高温度和产物浓度的位置更靠近燃烧室进口。此外,多孔燃烧器的温度比自由火焰燃烧器低,NOx和CO污染物也更低。KeywordsMethane /空气火焰;湍流模型;数值模拟;Non-Premixed;多孔介质
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