Mixing and combustion performance of the mixing-enhanced flame stabilizer with close-coupled gaseous fuel injection

Mixing of fuel and air is important for improving combustion performance and reducing pollution emissions. To improve the mixing performance of gaseous methane and air, the typical flame stabilizer was modified. A numerical study was conducted to compare the mixing and combustion performance of the mixing-enhanced flame stabilizer with the original one, and the mixing enhancement mechanism was clarified. The results show that the mixing performance of the mixing-enhanced flame stabilizer is improved in two ways. On the one hand, the disturbance of the gas fuel jet in the recirculation zone promotes the mixing of fuel and air. On the other hand, the velocity gradient between the recirculation zone downstream the bluff body and the mainstream decreases, which allows more fuel to enter the recirculation zone downstream the bluff body. This study is expected to promote the rapid mixing of gaseous fuel jets and the flame stability of the combustion chamber based on bluff body stabilizers.