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
Numerical Studies of the Onset Temperature Ratio for Spontaneous Gas Oscillation in a Thermoacoustic Engine with a Looped Tube and Resonator
Shohei Nagata,Yuki Ueda +1 more
Journal ArticleDOI
Prediction of limit cycle amplitudes in thermoacoustic engines by means of impedance measurements
TL;DR: In this article, a high amplitude, acoustic impedance sensor was developed to perform measurements of the input impedance of a thermoacoustic core, as a function of the heating power supplied to the device, of the frequency, and of the amplitude of acoustic forcing.
Journal Article
Impact of Viscous and Heat Relaxation Loss on the Critical Temperature Gradients of Thermoacoustic Stacks
TL;DR: In this paper, a dimensionless critical temperature gradient factor is obtained based on the linear thermoacoustic theory for a standing wave thermo-acoustic engine to obtain a low onset temperature difference (the minimum temperature difference to start engine's self-oscillation).
Dissertation
Velocity phase encoded MRI of gas flow in the acoustic boundary layer
TL;DR: In this paper, the use of magnetic resonance imaging (MRI) to study acoustic oscillations of a gas in a cylindrical tube was explored, where the gas is in the Acoustic Viscous Boundary Layer and it s flow is laminar.
Design of a traveling wave thermoacoustic engine driven cooler with hybrid configuration
Ali Al-Kayiem,Zhibin Yu +1 more
TL;DR: In this paper, a hybrid configuration of a traveling wave thermoacoustic engine and an acoustic load (i.e., a thermo-acoustic cooler) is installed to the engine and a numerical model is established using the reported parameters and validated by the published data.
References
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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
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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.