This article is cited in 5 papers

Conditions for the excitation of a laminar kinetic singing flame

V. V. Afanas'ev^a, S. A. Abrukov^a, N. I. Kidin^b, A. K. Kuz'min<sup>a

a</sup> Chuvash State University
^b Institute for Problems in Mechanics of the Russian Academy of Sciences, Moscow

Abstract: 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 $\mathring{\mathrm{A}}$ 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.

UDC: 536.46

Received: 10.10.1994
Accepted: 27.12.1994

 English version: Combustion, Explosion and Shock Waves, 1995, 31:4, 432–436