Influence of acoustic energy on suppression of soot from acetylene diffusion flame

Abstract The effect of the energy of forced acoustics on the soot suppression from an acetylene-air diffusion flame is experimentally investigated. The acoustic energy is calculated by integrating the acoustic power in the positive period. Results show that the suppression efficiency of soot increases linearly with the increase of acoustic energy. In addition, the acoustic energy is similar under different acoustic waveforms when achieving the same soot suppression effect. The acoustic waves cause the flame to periodically stretch and compress, and the flame brush shows the range of fluctuations in the flame front. When the fluctuation velocity is greater than 2 m/s, the suppression efficiency reaches 50%. However, as the premixed level increases, the flame height decreases, resulting in a decrease of fluctuation velocity.