Numerical simulation of fuel-rich methane turbulent diffusion flames

A three-step reduced mechanism was applied to compute fuel-rich methane-air turbulent diffusion flame properties to save calculation time. Good agreement was obtained between computed and measured values on temperature, CO, and CO₂ distributions in the combustor except for the near flame front. It was difficult to compute very perturbed areas like a flame front because the k-ε2-equation model was modeled based on isotropic turbulence and isothermal fields. Good agreement was also obtained for CO distribution that was formed well in fuel-rich conditions by using three-step reduced mechanism. It was impossible to compute CO distribution using one-step reduced mechanism, which is mainly used in combustion simulation. Numerical simulation using the three-step reduced mechanism is a more effective method of computing the characteristics of turbulent diffusion flame because of the ability to compute a local fuel-rich condition. Original is an abstract.