Experimental investigation of the impact of different flame holder materials on the flame stability and flame characteristics using double-layered combustor wall material

This paper investigates the effects of different thermal conductivity flame holder materials with different blockage ratios to optimise flame stabilisation, blow-off limits and recirculation zone inside the combustor wall of a premixed LPG and air. The paper experimentally investigates the performance of flame holders are using three different materials such as ceramic flame holder, stainless steel flame holder and silicon carbide flame holder. The study aims to measure the blow-off limits, equivalence ratio, LPG mass flow rate, rich and lean flammability limits, and blow-off regions that impact flame stability and stable flames. The impact of disc-shaped materials having different blockage ratios such as 0.26, 0.36, 0.46, 0.56, respectively are investigated at an equivalence ratio of 1.80 and mass fuel flow rate of 0.61 g/s. The double-layered combustor having higher thermal conductivity for the inner wall and lower thermal conductivity material for the outer wall significantly reduces the heat loss to the surroundings. The study implies were the important implementation of wall material type, flame holder material type, optimal blockage ratio, flame stability of LPG and air-premixed flame, and mass fuel flow rate for attaining successful combustion. The results indicate that the lower thermal conductivity flame holder material along with the help of high and low double-layered wall material, optimal blockage ratio can induce a stable flame region and recirculation zone. The blockage ratio at 0.46 performed well in flame stabilisation, decreased flame length and also in flame shape. The flame species concentrations such as CO, NO, CO2, and O2 were analysed by using a Portable gas analyser. The results influence a better study of the performance of the different material-based flame holders.