Experimental studies on stability of multiple interacting jet flames

This paper discusses the flame height and stability characteristics of single- and group jet-flames formed by the multiple-interacting jet flames issuing from 2mm diameter orifices configured on the burner-exit injector plate. The LPG group jet-flames without the central flame exhibited higher flame-lift, drop-back and blowout velocities compared to single jet flame of same port area: this enhanced flame stability is perhaps linked with enhanced mixing of entrained air with jet fuel and burnt-gas recirculation occurring on account of the separation distance between the reacting jets. Further, the blow-out velocity of the group jet-flames is seen to be about 1.65 times the blow-out velocity of individual single jet flame issuing from 2 mm diameter. As regards flame height, group jet flames with no central flame is seen to be shorter compared to single jet flame of same port area. With central jet flame in position, group jet-flames are rendered taller due to oxygen starvation caused by the reduced separation distance of interacting jet-flames.