From "ThermoAcoustics and the Rijke Tube: Experiments, Identification, and Modeling", thermoacoustic instability can be subsided using an amplifier and a speaker.

It says in page 4,

The microphone signal (AC coupled) is fed via the DAQ board to Simulink, where it is recorded and multiplied with the variable gain.

Isn’t it merely increasing the amplitude of the audio input? How is it possible to reduce thermoacoustic combustion instability?

  • $\begingroup$ The speaker is at one end of the tube and the microphone at the other. There is a feedback loop from the speaker to the microphone, and there is a delay in the feedback loop because the speed of sound in the tube is finite. $\endgroup$ – alephzero Nov 11 '18 at 12:46

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