Warasan Witthayasat Lae Theknoloyi Mahawitthayalai Mahasarakham (Oct 2019)
Numerical Simulation of Methane Combustion Using RNG Turbulence Eddy Dissipation Concept
Abstract
Combustion is a very important process for changing energy from various fuels. High heat from combustion is employed for various engineering applications. However, analysis of combustion processes is very complex, since physical mechanisms are related to many chemical reaction equations and various scales of turbulent motions. In order to save costs for experimental set up and understanding in more detail, a numerical study of combustion was performed in the study. The combustion of methane (CH4) using turbulence interaction of RNG combustion with detailed kinetic mechanism, 53 species and 325 reactions was chosen in this work. The results of the temperature predictions from a two-dimensional case are compared with the available experimental data from Sandia National Laboratories. The inlet velocity, angle of injection and temperature of methane and air are the main parameters to predict heat release and reaction rate of hydroxyl (OH), carbon monoxide (CO) and carbon dioxide (CO2). It waws found that the flow velocity and the injection angle of methane influenced changes in the shape of the flame while the temperature increased the reaction rate of CO, CO2 and OH significantly. It can be concluded that the physical properties at the inlet have an effect to the rate of chemical reactions of combustion and the amount of product gas generated after combustion. For academic understanding of the combustion process on the rate of reaction, however, large eddy simulation with dynamics structure is a suitable choice for future studies.
