Flame structure and stability for gradient magnetic field enhanced non-premixed combustion of highly diluted methane with nitrogen

Efficient utilization of low calorific value fuels is challenging due to their limited burning rates and stability. This study explored the use of upward-increasing magnetic fields as a novel approach to enhance flame stability in such conditions, focusing on non-premixed highly diluted methane flames with nitrogen. Employing a vertical burner, magnetic intensities were varied to observe their impact on laminar jet diffusion flames. This research revealed that the gradient magnetic fields significantly modify flame characteristics. At lower magnetic intensities, the influence on flame structure, temperature, and stability was minimal. However, as magnetic intensity increased, notable changes in flame features such as height, shape, and thermal distribution were observed, suggesting a threshold intensity beyond which the magnetic influence becomes pronounced. The research further demonstrated that gradient magnetic fields could enhance the blow-out concentration limit, indicating an effective strategy for managing combustion in diluted fuels. The findings provide valuable insights into magnetic fields ' role as a control mechanism, offering potential advancements in combustion technology and contributing to the broader pursuit of energy efficiency and reduced emissions in industrial applications.