Stage M2 – Modeling acoustic flow inside a thermoacoustic regenerator

Oscillating flows are encountered in many engineering applications, such as blood flows and fluid control systems. Oscillating flows at high frequencies (i.e., acoustic flows) have much less investigated than quasi-steady oscillating flows (i.e., low frequency and high amplitude). Acoustic flows are found in many engineering applications, such as Stirling engines and thermoacoustic devices (i.e., engines and refrigerators). The change of the flow regime from laminar to turbulence is an important phenomenon because it may influence the performance of these devices. The current study focuses on thermoacoustic devices.
Thermoacoustic devices contain a thermoacoustic core, which consists of a porous medium (known as the regenerator) sandwiched between two heat exchangers. The thermoacoustic core (TAC) is usually placed inside a resonator. In an empty resonator, the oscillating flow regime (i.e. laminar or turbulent) depends on both acoustic velocity amplitude and the oscillating frequency. In the
presence of the regenerator, the flow regime depends also on the regenerator’s configuration. (…)

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