Experimental Study on the Effect of Flame Surface Area Fluctuation on the Heat Release Fluctuation in a Premixed Bunsen Flame

A combustion chamber with a branch tube was built to investigate the characteristics of a spontaneous oscillating laminar premixed Bunsen flame. The flame behavior was observed, and the relation between the flame surface area and heat release rate was inspected. The equivalence ratio and mean velocity were fixed at 1.1 and 1.75 m/s, respectively. The amplitude of the pressure fluctuation in the combustion chamber was changed and the flame behavior was affected when the length ratio between the branch tube and combustion chamber (L:R) was varied. The , , and flame chemiluminescence had similar behavior qualitatively. There was linearity between the flame surface area and heat release rate.