Analysis of The Impact of Numerical Parameters on Computational Fluid Dynamics of Flow in Burner Chambers

Abstract

Objective: This study investigates the impact of different burner geometries and turbulence models on biodiesel flow, using Computational Fluid Dynamics (CFD) to optimize the flow within the combustion chambers.   Theoretical Framework: The theoretical framework is based on studies regarding the performance of biodiesel blends, burners with rotational flow, and the application of different turbulence models in CFD simulations. The literature shows that rotational flow can improve mixing and combustion, but simulations depend on mesh refinement and the choice of turbulence model.   Method: Eighteen simulations were conducted using Ansys CFX 17.1 software, employing meshes with different levels of refinement (Coarse, Medium, Fine), two turbulence models (k-ε and RNG k-ε), in addition to three three-dimensional burner models: without guide vanes (Without Swirl), with a shallow angle (Swirl Low), and with a steep angle (Swirl High).   Results and Discussion: The results show that mesh refinement had a significant impact on the biodiesel volumetric fraction, with higher concentrations observed in finer meshes. Differences between the turbulence models were minor. Comparing the geometries, the Swirl High configuration exhibited more turbulent flow with clear vortex formation, higher velocities, and better fuel dispersion.   Research Implications: The findings suggest that optimizing burner geometry and using refined meshes can significantly improve biodiesel combustion efficiency in industrial burners. These improvements may lead to a reduction in NOx emissions and other pollutants. Thus, the use of this type of geometry may increase the adoption of biodiesel in the industry, contributing to a reduction in environmental impact.   Originality/Value: This study contributes to the literature by demonstrating the influence of burner design and mesh refinement in CFD simulations. The practical application of these results can guide the development of more efficient and sustainable burners, promoting the use of biodiesel as an ecological alternative to fossil fuels, particularly in the industrial sector.