Active control of thermoacoustic amplification in a thermo-acousto-electric engine
Résumé
In this paper, a new approach is proposed to control the thermoacoustic amplification in a traveling-wave thermoacoustic engine. Based on the assumption that the spatial distribution of the self-established acoustic field in a stabilized regime does not necessary have the optimal shape for the most efficient thermal-to-acoustic conversion, this method uses an auxiliary acoustic source with a feedback loop applied on a thermo-acousto-electric transducer to improve its overall efficiency. After a brief presentation of the engine and its capabilities without any form of control, the preliminary results of an experimental study under various conditions are shown to demonstrate the possibility of a significant improvement in the thermoacoustic conversion with an appropriate tuning of the control parameters of the feedback loop. Applicability and further directions of investigation are also discussed.
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