In order to improve the non-premixed flame stability in the micro-combustor

an asymmetric swirl micro-combustor for H2/air non-premixed combustion is proposed based on the asymmetric swirl combustion theory. The flame stabilization mechanism in the micro-combustor is studied by numerical simulation

and the effects of different air mass flow rates and equivalence ratios on the combustion characteristics of the micro-combustor are observed. The results show that the corner recirculation area

central recirculation area and low velocity area generated in the asymmetric swirl micro-combustor can prolong the residence time of fuel in the burner and improve the combustion efficiency. The central recirculation zone plays a major role in the anchoring of the flame root

which prevents the flame from being blown downstream of the burner and improves flame stability. The increase of air mass flow and equivalence ratio will reduce the combustion efficiency

increase the flame length

and gradually move the flame to the outlet. Therefore

appropriate air mass flow and equivalence ratio are conducive to the stable combustion of the flame in the combustion chamber. When the hydrogen/air equivalent ratio is 0.6 and the air mass flow is between 0.5×10−5 kg/s to 3.5×10−5 kg/s

the fuel in the micro-combustor is nearly completely burned

and the combustion efficiency is close to 100%.