Journal ArticleDOI
A thermoacoustic-Stirling heat engine: detailed study
Scott Backhaus,Gregory W. Swift +1 more
Reads0
Chats0
TLDR
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
More filters
Journal ArticleDOI
A traveling-wave thermoacoustic electric generator with a variable electric R-C load
TL;DR: In this paper, a traveling-wave thermoacoustic electric generator with a variable electric R-C load was constructed and experimentally studied, and the authors showed the importance of mechanical and electrical resonances to the overall performance of the system and found that the thermal-to-electric efficiency and the electric power were proportional to the pressure amplitude and the square of the piston of the linear alternator, respectively.
Journal ArticleDOI
A multi-stage travelling wave thermoacoustic engine driven refrigerator and operation features for utilizing low grade energy
TL;DR: In this paper, the authors investigated a looped tube refrigerator driven by a three-stage traveling wave thermo-acoustic engine (later simply called as thermacoustic engine-refrigerator system) for power electronic thermal management utilizing low grade energy.
Journal ArticleDOI
Study of a coaxial thermoacoustic-Stirling cooler
M. E. H. Tijani,S. Spoelstra +1 more
TL;DR: In this paper, a coaxial thermoacoustic-Stirling cooler is built and performance measurements are performed, which uses the acoustic power produced by a linear motor to pump heat through a regenerator from a cold heat exchanger to an ambient one.
Journal ArticleDOI
Linear and nonlinear modelling of a theoretical travelling-wave thermoacoustic heat engine
TL;DR: In this article, the authors carried out three-dimensional Navier-Stokes simulations, from quiescent conditions to the limit cycle, of a theoretical travelling-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
Multi-physics coupling in thermoacoustic devices: A review
TL;DR: In this paper, a comprehensive review of the multi-physics coupling effects, namely, thermal-acoustic coupling, acoustic-mechanical coupling and mechanical-electric coupling, inside thermoacoustic devices including thermo-acoustically-driven refrigerators, etc.
References
More filters
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.