Acoustic power measurements of oscillating flames


Valk, M. (1981) Acoustic power measurements of oscillating flames. Combustion and Flame, 41 . pp. 251-260. ISSN 0010-2180

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Abstract:The acoustic power of an oscillating flame is measured. A turbulent premixed propane/air flame is situated near a pressure antinode of a standing wave in a laboratory combustion chamber. This standing wave is generated by a piston. The fluctuating heat release of the flame will supply acoustic power to the standing wave as postulated by Rayleigh. This flame acoustic power is obtained by setting up a power balance of the whole combustion chamber.

Experiments proved that it is possible to measure quantitatively the acoustic power and the frequency change as a function of relevant parameters. This frequency change is a second phenomenon described by Rayleigh. The acoustic power of the flame as a function of the amplitude of the fluctuating component of the mixture flow velocity at different frequencies can be measured.

Measurement techniques are described and results for frequencies ranging from 3 to 120 Hz are given.
Item Type:Article
Copyright:© 1981 Elsevier Science
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