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) 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 investigated using two stack aperture ratios through simulations of the coupled phenomena between fluid–acoustic interactions in the cavity flow and heat conduction in the stack. In a reverse way, by adding heat to a stack in a cavity flow, aeroacoustically generated tone can be increased, which can be used for the acoustic sources for flow control.
