✦ LIBER ✦

Acoustic power measurements of oscillating flames

✍ Scribed by M. Valk

Publisher: Elsevier Science
Year: 1981
Tongue: English
Weight: 499 KB
Volume: 41
Category: Article
ISSN: 0010-2180
DOI: 10.1016/0010-2180(81)90060-2

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✦ Synopsis

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.

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