Stagnation laminar premixed CH4/air flame subjected to the equivalence ratio oscillations

The effect of the equivalence ratio oscillation on a premixed laminar ch4/air flame motion was studied experimentally with equivalence ratio oscillation frequencies of 2 to 15 hz at lean equivalence ratio using stagnation flow field burner. novel oscillator does the oscillation conditions and turbulence reduction method is used to suppress the velocity perturbation. the flame position variations at 2,5,10 and 15 hz oscillation frequencies were significantly small when the amplitude of the equivalence ratio oscillation was zero. on the other hand,increase in amplitudes of the equivalence ratio oscillation increased the flame position variation significantly. the flame moved in sinusoidal shape and it can be clearly seen that the flame movement's amplitude was proportional to the amplitudes of the equivalence ratio variations. this result showed that the velocity perturbation is significantly suppressed by turbulence reduction method in the examination range. © 2015 penerbit utm press. all rights reserved.