Characteristics of thermoacoustic conversion and coupling effect at different temperature gradients

Yutao Zhang, Xueqiang Shi, Yaqing Li, Yuanbo Zhang and Yurui Liu

Energy, 2020, vol. 197, issue C

Abstract: The thermoacoustic engine that can convert heat into sound offers a promising methodology of energy usage. However, the low energy conversion rate limited the exploitation of this technology. To obtain high acoustic power and energy outputs, effects of temperature gradients on thermoacoustic characteristics were numerically investigated in this study. The results indicated that temperature gradients had significant impacts on the output sound pressure and heat flux. Meanwhile, complicated coupling effects among the temperature, fluid velocity and sound pressure were observed during the thermoacoustic oscillations. Deep insight into the phase changes implied that the temperature difference would initiate the oscillations of the fluid movement and induce the sound pressure afterwards. The study also demonstrated that large temperature differences and abrupt temperature changes were favorable for the acoustic power output.

Keywords: Thermoacoustic conversion; Temperature gradients; Thermoacoustic oscillation; Energy conversion; Acoustic power (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:197:y:2020:i:c:s0360544220303352

DOI: 10.1016/j.energy.2020.117228

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