Double swirl burners are an advanced type of burner designed to improve combustion and increase flame stability. The burner used consists of two separate swirling air streams. In this paper, various experiments were performed on the burner. Subsequently, the results obtained from the experiments were repeated with a combustion chamber installed around the burner to analyze and investigate the changes that occurred. Key variables include the equivalence ratio, inner swirl number, outer swirl number, and flow split ratio.

The experiments conducted in both configurations (without and with the chamber) indicated that adding the chamber generally restricted the flame stability and, in some cases, resulted in a longer flame length. Furthermore, the results show that adding the chamber caused the lean blowout limit to extend to lower equivalence ratio values at some operating points. Also, under specific conditions, it was shown that increasing the outer flow split ratio leads to a shorter flame length and an increase in flame width; both effects were simultaneously observed in the flame area as well. Additionally, at points tested for both configurations (with and without the chamber) at a specific confinement ratio, the flame liftoff height did not change