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
Operating characteristics and performance improvements of a 500 W traveling-wave thermoacoustic electric generator☆
TL;DR: In this article, a traveling-wave thermoacoustic electric generator capable of generating about 500 W electric power is studied numerically and experimentally, and the performances and the operating characteristics of the system under different working conditions are tested and analyzed.
Journal ArticleDOI
Linear and Nonlinear Modeling of a Traveling-Wave Thermoacoustic Heat Engine
TL;DR: In this article, a traveling-wave thermoacoustic heat engine (TAE) composed of a long variable-area resonator shrouding a smaller annular tube, which encloses the hot (HHX) and ambient (AHX) heat-exchangers, and the regenerator (REG).
Journal ArticleDOI
Experimental investigation on a thermoacoustic engine having a looped tube and resonator
TL;DR: In this paper, the impact of regenerator hydraulic radius, resonator length, and mean pressure on the characteristics of the tested thermoacoustic engine, which has a looped tube and resonator.
Journal ArticleDOI
Heat transfer processes in parallel-plate heat exchangers of thermoacoustic devices – numerical and experimental approaches
TL;DR: In this article, a mixture of experimental and numerical approaches are used to study the thermal-fluid processes controlling heat transfer in thermoacoustic heat exchangers on the micro-scale of individual channels.
Journal ArticleDOI
Nonlinear heat transfer processes in a two-phase thermofluidic oscillator
TL;DR: In this paper, a nonlinear model for a two-phase thermofluidic oscillator was proposed and compared to those from the linear equivalents and experimental observations, and the results reveal that although both linear and nonlinear models predict similar oscillation frequencies, the nonlinear approach predicts lower exergetic efficiencies.
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.
Book
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.