2022 Volume 39 Issue 4 Pages 249-
The object of this paper is to investigate thermoacoustic refrigerator driven by noise energy and waste heat generated from engine plants. The noise has complicated frequency characteristics and low energy density. Therefore, the selective amplification of acoustic wave by using thermoacoustic energy conversion has been studied. The stacked wire-mesh screen with steep temperature gradient was installed in the one-third length of pipe with one closed end. In experiments, the pressure, particle velocity, and phase difference were measured by varying the frequency of acoustic wave and the channel size of the stack. The acoustic wave at third harmonic-frequency was amplified by thermoacoustic effect. On the other hand, the acoustic waves at other frequency were damping by viscosity dissipation in the stack. The optimum size of aperture in the stack for thermoacoustic amplification was also depicted. Summarizing these results, the proposed selective amplification was tested for noise energy generated in marine ship.
