Journal ArticleDOI
A thermoacoustic-Stirling heat engine: detailed study
Scott Backhaus,Gregory W. Swift +1 more
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A new type of thermoacoustic engine based on traveling waves and ideally reversible heat transfer is described and data are presented which show the nearly complete elimination of the streaming convective heat loads.Abstract:
A new type of thermoacoustic engine based on traveling waves and ideally reversible heat transfer is described. Measurements and analysis of its performance are presented. This new engine outperforms previous thermoacoustic engines, which are based on standing waves and intrinsically irreversible heat transfer, by more than 50%. At its most efficient operating point, it delivers 710 W of acoustic power to its resonator with a thermal efficiency of 0.30, corresponding to 41% of the Carnot efficiency. At its most powerful operating point, it delivers 890 W to its resonator with a thermal efficiency of 0.22. The efficiency of this engine can be degraded by two types of acoustic streaming. These are suppressed by appropriate tapering of crucial surfaces in the engine and by using additional nonlinearity to induce an opposing time-averaged pressure difference. Data are presented which show the nearly complete elimination of the streaming convective heat loads. Analysis of these and other irreversibilities show which components of the engine require further research to achieve higher efficiency. Additionally, these data show that the dynamics and acoustic power flows are well understood, but the details of the streaming suppression and associated heat convection are only qualitatively understood.read more
Citations
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Journal ArticleDOI
Oscillating flow in a 2-D diffuser
Cameron V. King,Barton L. Smith +1 more
TL;DR: In this article, the separation of oscillating flows in an internal, adverse pressure gradient geometry is studied experimentally, and the extent of separation grows with L 1 0/h.
Journal ArticleDOI
CFD analysis of nonlinear processes in pulse tube refrigerators: Streaming induced by vortices
TL;DR: In this paper, a two-dimensional simulation of an inline inertance tube pulse tube refrigerator (ITPTR) is performed for different operating frequencies with the help of the FLUENT® package.
Journal ArticleDOI
High-frequency thermoacoustic-Stirling heat engine demonstration device
TL;DR: In this paper, a small thermoacoustic-Stirling engine demonstration device that can produce sound in excess of 100 dB at 560 Hz has been constructed, which consists of a quarter wavelength acoustic resonator with a smaller diameter coaxial regenerator positioned toward the resonator's closed end, thereby forming an acoustic feedback path around the regenerator.
Journal ArticleDOI
Influence of operational and geometrical parameters on the performance of twin thermoacoustic prime mover
TL;DR: In this paper, the performance of twin thermoacoustic prime mover is evaluated in terms of onset temperature difference, resonance frequency and pressure amplitude of the acoustic waves by varying the resonator length and charge pressures of fluid medium nitrogen.
Journal ArticleDOI
Electrical-analogy network model of a modified two-phase thermofluidic oscillator with regenerator for low-grade heat recovery
Jingqi Tan,Jianjian Wei,Tao Jin +2 more
TL;DR: In this article, an electrical-analogy network model including a regenerator model based on wet thermoacoustic principle is proposed to predict the resonant frequency and the onset temperature difference of a modified two-phase thermofluidic oscillator.
References
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Book
Fundamentals of acoustics
TL;DR: In this article, the authors present a two-dimensional wave equation and simple solutions for the wave equation with respect to the two dimensions of the wave and the two types of vibrations.
Book
Introduction to Fluid Mechanics
Robert W. Fox,Alan T McDonald +1 more
TL;DR: In this article, the physical concepts of fluid mechanics and methods of analysis, beginning from first principles, are discussed, and a more orderly approach to problem solving is presented, starting from basic equations, states all assumptions clearly, and relates results to expected physical behavior with the aid of 103 example problems.
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Handbook of hydraulic resistance
TL;DR: In this paper, pertes de : charge, frottement, incompressible, ecoulement, interne reference record created on 2005-11-18, modified on 2016-08-08
Proceedings Article
Thermoacoustic engines
W. P. Arnott,R. Raspet,H.E. Bass +2 more
TL;DR: In this paper, an approximate analysis of energy flow and acoustical measurements of a thermoacoustic prime mover with arbitrary cross-sectional geometry is given. But this analysis is restricted to the case of TAEs with circular or parallel slit pore geometry.