This study addresses a problem introduced by finite-amplitude oscillations in a liquid piston thermoacoustic Stirling engine and proposes methods to overcome it. After the engine was operated by external heat, the liquid piston oscillated, keeping a flat surface when the amplitude was sufficiently low. However, it became unstable to cause ejection of droplets and formation of air bubbles because the acceleration amplitude exceeded gravitational acceleration. Two methods were proposed to recover the stable liquid surface: one method was the enlargement of the cross-sectional area of the tube around the liquid surface and the other method was the use of submerged polyethylene floats. These methods successfully suppressed the instability of the liquid piston Stirling engine and increased the pressure amplitude by almost twice of the original engine. In addition, adjusting the liquid filling level resulted in the ratio of pressure amplitude over the mean pressure reaching 18% when the acceleration amplitude was elevated to by the installation of floats. The high-pressure amplitude is an advantage of a liquid piston thermoacoustic Stirling engine over thermoacoustic engines that use only gas as the working fluid.
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21 April 2020
Research Article|
April 15 2020
Suppression of liquid surface instability induced by finite-amplitude oscillation in liquid piston Stirling engine
P. Murti
;
P. Murti
Department of Mechanical Systems Engineering, Tohoku University
, 6-6, Aramaki, Aoba-ku, Sendai 980-8579, Japan
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H. Hyodo;
H. Hyodo
Department of Mechanical Systems Engineering, Tohoku University
, 6-6, Aramaki, Aoba-ku, Sendai 980-8579, Japan
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T. Biwa
T. Biwa
Department of Mechanical Systems Engineering, Tohoku University
, 6-6, Aramaki, Aoba-ku, Sendai 980-8579, Japan
Search for other works by this author on:
Department of Mechanical Systems Engineering, Tohoku University
, 6-6, Aramaki, Aoba-ku, Sendai 980-8579, Japan
a)
Also at: Department of Mechanical and Industrial Engineering, Faculty of Engineering, Universitas Gadjah Mada, Jl. Grafika No. 2, Yogyakarta 55281, Indonesia.
b)
Author to whom correspondence should be addressed: [email protected]
J. Appl. Phys. 127, 154901 (2020)
Article history
Received:
February 05 2020
Accepted:
April 01 2020
Citation
P. Murti, H. Hyodo, T. Biwa; Suppression of liquid surface instability induced by finite-amplitude oscillation in liquid piston Stirling engine. J. Appl. Phys. 21 April 2020; 127 (15): 154901. https://doi.org/10.1063/5.0003921
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