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Communication Dans Un Congrès Année : 2017

To predict a thermoacoustic engine's limit cycle from its impedance measurement

Résumé

Thermoacoustic engines are self-oscillating systems converting thermal energy into acoustic waves. Recent studies on such engines highlight much nonlinear effects responsible for the engine’s saturation, leading to a limit cycle, which can be stable or not. Those effects however, are not sufficiently known, even with today knowledges, to accurately predict a limit cycle oscillations amplitude. This work suggests a new approach, based on acoustic impedance measurement at large forcing amplitudes, to predict the limit amplitude in steady state for a given engine. This method allows one to predict an engine’s saturation amplitude without studying in detail its intern geometry. In the case of a quarter wave length engine, its input impedance can easily be obtained from an impedance sensor for example. Increasing the speaker’s forcing leads to a nonlinear impedance depending on the acoustic field amplitude. Once measured, this function contains information such as the limit cycle amplitude, its stability and the engine’s efficiency depending on parameters as the applied heating and stack’s position. In the case of a standing wave prime mover, this study shows first results obtained from this method. Later on, this work should lead to steady state predictions for any, unknown, given engine.
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Dates et versions

hal-02465255 , version 1 (03-02-2020)

Identifiants

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Valentin Zorgnotti, Guillaume Penelet, Gaelle Poignand, Steven Garrett. To predict a thermoacoustic engine's limit cycle from its impedance measurement. Meeting of the ASA 2017, Jun 2017, Boston, United States. pp.3737-3737, ⟨10.1121/1.4988212⟩. ⟨hal-02465255⟩
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