Investigation concentric flow conical burner mixing field by species transports model

Abstract

This study investigates flame stabilization in a concentric flow conical burner operating under partially premixed combustion conditions. The burner configuration was designed to generate controlled inhomogeneous partially premixed environments with improved stability characteristics. Experimental measurements and numerical simulations based on the species transport model were conducted to evaluate the effects of mixing level, Reynolds number, and equivalence ratio on combustion performance. The numerical model was validated using highly resolved Particle Image Velocimetry (PIV) measurements, demonstrating good agreement with experimental observations. Flow-field structures, velocity distributions, and temperature profiles were analyzed to assess the influence of the conical geometry on flame stabilization mechanisms. A new parameter, (A_mix/D²), was introduced to quantify the ratio of the mixture-region area to the total mixing-field area, including recirculation zones. Results showed that increasing axial distance enhanced mixing and flame stability. The most stable operating condition was achieved at XD = 1 and LD = 10, where symmetric velocity and temperature distributions were maintained. Methane exhibited greater stability than hydrogen due to its lower reactivity.