Hysteretic behavior induced by an electroacoustic feedback loop in a thermo-acousto-electric generator
| Autor: | Pierrick Lotton, Guillaume Penelet, Come Olivier, Gaelle Poignand |
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| Přispěvatelé: | Laboratoire d'Acoustique de l'Université du Mans (LAUM), Centre National de la Recherche Scientifique (CNRS)-Le Mans Université (UM) |
| Rok vydání: | 2016 |
| Předmět: |
Engineering
Acoustics and Ultrasonics Microphone Acoustics Loudspeakers Electric generator Forced oscillations 7. Clean energy 01 natural sciences law.invention law 0103 physical sciences 010306 general physics 010301 acoustics Heat engine [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph] business.industry Amplifier Thermoacoustics Feedback loop Acoustic field Pressure measurement Loudspeaker business |
| Zdroj: | Applied Acoustics Applied Acoustics, Elsevier, 2016, 105, pp.110-115. ⟨10.1016/j.apacoust.2015.11.001⟩ |
| ISSN: | 0003-682X |
| DOI: | 10.1016/j.apacoust.2015.11.001 |
| Popis: | International audience; An active control method of the spatial distribution of the acoustic field is applied in a thermo-acousto-electric generator. An auxiliary acoustic source is used to force the self-sustained thermoacoustic oscillation in order to control the thermoacoustic amplification. The auxiliary source consists of a loudspeaker, located inside the loop-tube close to the main ambient heat exchanger, and supplied with a delayed signal through an electric feedback loop, comprising a phase-shifter and an amplifier, connected to a reference microphone. Experiments are performed on a prototype engine working with air at a static gauge pressure of 5 bars. Experimental results demonstrate how it is possible to tune the acoustic oscillations in order to increase the global performance of the generator, compared to the case without control, as well as the existence of a hysteretic behavior induced by the electroacoustic feedback loop itself, which leads to a discrepancy between the onset heat input and the offset one. |
| Databáze: | OpenAIRE |
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