Utilization of sound energy and waste heat with thermoacoustics, which is conversion phenomena between sound and heat energies, is focused on. A cascade of flat plates (parallel-plate stack) or honeycomb stack, including multiple fine tubes, positioned in a cavity flow can drive the thermoacoustic heat flow and create a heat pump using aerodynamic sound. The effects of the stack position on a thermoacoustic heat pump were found to greatly affect the heat pump effects and self-sustained oscillations in the cavity flow. In a reverse way, the method for the control of the cavity tone by adding heat to the stack in a cavity flow is also investigated, where the stack works can be considered to be acoustic metamaterial to reduce the resonance.

Acoustic field around a cavity flow with a parallel-plate stack for thermoacoustic heat pump
Demonstration of thermoacoustic engine
Sound generation from thermoacoustic engine (movie with sound)

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