Abstract
Thermoacoustic energy-conversion systems have received significant attention in the recent decades, as it does not have any moving component and has great potential for refrigeration applications. There are 2 general types of thermoacoustic engines (TAEs). One is standing-wave, which is a phase-dominant type, and approximately described by Brayton cycle. The other is traveling-wave one, which is amplitude-dominant. In this chapter, we introduce dynamic multiphysics coupling and energy conversion process of a standing-wave TAE by applying numerical, experimental, and theoretical approaches. In this chapter, three-dimensional RANS, DES, SBES, and LES simulations are conducted and compared to shed lights on the heat-driven acoustics, nonlinear dynamics behaviors, hydrodynamics, and heat transfer features in a quarter-wavelength standing-wave TAE. Later, a high-frequency standing-wave TAE is designed and experimentally tested. Linear thermoacoustic theory is applied to analyze the energy conversion process. In general, this chapter examines the key parameters affecting the performance of standing-wave TAEs.
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