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Active control of thermoacoustic amplification in a thermo-acousto-electric engine

Abstract : In this paper, a new approach is proposed to control the operation of a thermoacoustic Stirling electricity generator. This control basically consists in adding an additional acoustic source to the device, connected through a feedback loop to a reference microphone, a phase-shifter, and an audio amplifier. Experiments are performed to characterize the impact of the feedback loop (and especially that of the controlled phase-shift) on the overall efficiency of the thermal to electric energy conversion performed by the engine. It is demonstrated that this external forcing of thermoacoustic self-sustained oscillations strongly impacts the performance of the engine, and that it is possible under some circumstances to improve the efficiency of the thermo-electric transduction, compared to the one reached without active control. Applicability and further directions of investigation are also discussed.
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https://hal-univ-lemans.archives-ouvertes.fr/hal-02057327
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Dernière modification le : jeudi 20 juin 2019 - 17:12:02
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Come Olivier, Guillaume Penelet, Gaëlle Poignand, Pierrick Lotton. Active control of thermoacoustic amplification in a thermo-acousto-electric engine. Journal of Applied Physics, American Institute of Physics, In press, 115 (17), pp.174905. ⟨10.1063/1.4874743⟩. ⟨hal-02057327⟩

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