Numerical and experimental study of the combustion methods and formation of NOx in a micro-flame front device appliance of a heatgenerator

Abstract

This study presents a combined numerical and action research of burning aspects, nitrogen oxide formation in a micro-flame front device heat generator operating under high excess air conditions. The analysis covers a wide range of air excess ratios (α = 4.4–10), representative of practical heating system regimes. Numerical model was executed using ANSYS Fluent, employing a pressure-based solver, the realizable k–ε turbulence model, and a non-premixed kindling approach. The interplay among stream dynamics, blending intensity, thermal field distribution is examined in detail. The results demonstrate that increasing inlet air velocity enhances turbulent mixing, leading to a more uniform temperature field and reduced peak temperatures. This effect significantly suppresses thermal NOx formation. The study confirms the potential of micro-flame combustion technology for stable and low-emission heat generation.