Abstract
An external acoustic effect on conical methane–air premix flame is experimentally studied at frequencies from 10 to 450 Hz. Conditions of flame blow-off in a wide range of mixture equivalence ratio have been determined. The visualization of the perturbed flame has been performed. The dependences of blow-off velocity limit are shown upon amplitude of the acoustic-induced velocity fluctuations and excitation frequency. Flow velocity fluctuations in the outlet section of the nozzle have been measured for investigated range of acoustic excitation frequencies. Also, the coupling between the blow-off conditions and flow velocity fluctuations has been established. The obtained results could be useful while analyzing stable operation conditions for the high-speed combustion chambers of the advanced propulsion plants.
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