Effect of flameout on Combustion of small particles in an acoustically oscillating flow

Combustion of magnesium and titanium particles in an acoustically oscillating flow is experimentally studied for the case where the particle dimensions are smaller than the amplitude of gas displacement in an acoustic wave. An increase in the combustion time of magnesium particles and a decrease in the combustion time of titanium particles upon application of acoustic vibrations is found. Characteristic features of fluctuations of the intensity of the luminous flux of a burning magnesium particle as a response to vapor-phase burning of a metal drop to an external acoustic action are revealed. An explanation of the shape of registered fluctuations is offered on the basis of an assumption about flame-front blowoff from the frontal point of the drop. Conditions necessary for flameout in an oscillating flow and effects that can be induced by flameout from the drop in the case of burning of sprayed fuels in intermittent burning devices are discussed.