Title: Thermoacoustic resonator and its sound source: Model of the coupling and experiments
Abstract:Current thermoacoustic devices typically consist of a sound source loaded by both a ‘‘rear’’ cavity and the ‘‘front’’ thermoacoustic resonator. The main element placed in the resonator is a stack supp...Current thermoacoustic devices typically consist of a sound source loaded by both a ‘‘rear’’ cavity and the ‘‘front’’ thermoacoustic resonator. The main element placed in the resonator is a stack supporting a temperature gradient, sandwiched between heat exchangers. In thermoacoustic refrigerators, heat transfer along the stack depends on the acoustic power flux available. In the framework of a previous model [Bailliet et al., ‘‘Coupling between loudspeakers and thermoacoustic cavities,’’ submitted to Acta Acustica], this acoustic power can be determined knowing the electrical voltage applied to the source, an electrodynamic loudspeaker, the goal being to optimize the coupling between the loudspeaker and the thermoacoustic resonator. However, in this model, the temperature gradient along the stack is set to zero. The main purpose of this paper is to include in this model the temperature gradient along the stack. The expression of the input acoustic impedance of the thermoacoustic resonator is modified using an approximated analytical solution of the linear equation for the acoustic pressure inside the stack. The efficiency of the coupled system is expressed, yielding the highest acoustic power flux available in the stack (controlled in this study by LDA measurements) for a given electrical voltage applied to the loudspeaker.Read More
Publication Year: 1999
Publication Date: 1999-02-01
Language: en
Type: article
Indexed In: ['crossref']
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