Abstract
Instabilities caused by flames or other heat sources in resonators can be suppressed with a feedback system. It consists of a microphone inside the resonator, a phase-shifter, an amplifier and a loudspeaker at one end of the resonator. The pressure field produced by the loudspeaker changes the boundary conditions at the end of the resonator. This annuls the unstable oscillations in a phase range of up to 150 degrees if the amplification is chosen to be sufficiently high. A theory explaining the effect of the feedback system on the stability behaviour will be developed. Experiments using a Rijke tube driven by a hot gauze have been performed which confirm the predictions of the theory. In a practical situation with background noise, the feedback system achieves a noise reduction of over 40 dB.
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© 1986 Springer, Berlin Heidelberg
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Heckl, M.A. (1986). Active Control of the Noise from a Rijke Tube. In: Comte-Bellot, G., Williams, J.E.F. (eds) Aero- and Hydro-Acoustics. IUTAM Symposia. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-82758-7_18
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DOI: https://doi.org/10.1007/978-3-642-82758-7_18
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-82760-0
Online ISBN: 978-3-642-82758-7
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