Conditions for the excitation of a laminar kinetic singing flame
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Experimental studies have been conducted of the concentration regimes of excitation and silence of acoustic instability of a laminar kinetic singing flame with changes in composition, flow rate, and initial temperature of a propane-air mixture. Measurements of the distribution intensity of the varying component of the emission of the CH radical at a wavelength of 4315 Å and of the phase difference between oscillations of pressure and of heat-release rate along the flame height have shown that the major portion of varying heat release for sustaining and amplifying pressure oscillations, in accordance with the Rayleigh criterion, occurs as a result of periodic changes in the surface area near the tip of the flame cone. A relation has been established between the change in the phase shift and the appearance of concentrational and temperature regions of excitation and silence of acoustic oscillations.
KeywordsMechanical Engineer Phase Shift Temperature Region Heat Release Distribution Intensity
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