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- W2009163964 abstract "An active instability control (AIC) system is used to suppress low-frequency combustion instabilities in a non-premixed multiple-flame combustor and to study their initiation. The AIC device is based on a feedback control loop: The signal provided by a microphone is filtered, processed and sent to driver units plugged on the air duct. It allows the suppression of all unstable modes of the combustor and also provides a new and powerful method to study the instability initiation. Starting from a controlled flame with AIC, the control system is switched off and the growth of the instability is analysed through high speed Schlieren cinematography and sound pressure and reaction rate measurements. Nonlinear spectral analysis is used to extract spectral information during the oscillation growth from the initiation to the limit cycle. Results reveal that five different phases take place between stable combustion and fully established instability. The source of the first flame movements is the flow excitation by longitudinal acoustic waves. When the flow oscillation amplitude is high enough to allow interactions between flame sheets, combustion becomes periodically enhanced. This coupling leads to a fast instability growth until a limit cycle is reached." @default.
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- W2009163964 date "1989-01-01" @default.
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- W2009163964 title "Initiation and suppression of combustion instabilities by active control" @default.
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- W2009163964 doi "https://doi.org/10.1016/s0082-0784(89)80147-x" @default.
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