Results 181 to 190 of about 1,003 (224)

Thermoacoustic engines

The Journal of the Acoustical Society of America, 1988
Thermoacoustic engines, or acoustic heat engines, are energy-conversion devices that achieve simplicity and concomitant reliability by use of acoustic technology. Their efficiency can be a substantial fraction of Carnot’s efficiency. In thermoacoustic prime movers, heat flow from a high-temperature source to a low-temperature sink generates acoustic ...
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Thermoacoustic engines and refrigerators

AIP Conference Proceedings, 2012
Thermoacoustic engines and refrigerators use gas inertia and compressibility to eliminate many of the mechanical contrivances required by traditional engines and refrigerators while providing potentially attractive options that might reduce environmental impacts.
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A thermoacoustic Stirling heat engine

Nature, 1999
Electrical and mechanical power, together with other forms of useful work, are generated worldwide at a rate of about 1012 watts, mostly using heat engines. The efficiency of such engines is limited by the laws of thermodynamics and by practical considerations such as the cost of building and operating them.
S. Backhaus, G. W. Swift
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Annular thermoacoustic engines

AIP Conference Proceedings, 2000
The goal of this paper is to describe some of the properties of single- and dual-stack annular thermoacoustic engines. It is explained that the single-stack configuration is not well suited for operation under parameters typical of standing-wave thermoacoustics.
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Nonlinear processes in thermoacoustic engines

The Journal of the Acoustical Society of America, 1994
In the first part of the paper it is shown how, on the basis of a different form of the energy equation, a more compact derivation of the Rott theory of thermoacoustic effects [N. Rott, Z. Angew. Math. Phys. 20, 230–243 (1969)] can be given. In the second part, a weakly nonlinear theory is built starting from the same formulation and the steady-state ...
A. Prosperetti, M. Watanabe
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A high performance thermoacoustic engine

Journal of Applied Physics, 2011
In thermoacoustic systems heat is converted into acoustic energy and vice versa. These systems use inert gases as working medium and have no moving parts which makes the thermoacoustic technology a serious alternative to produce mechanical or electrical power, cooling power, and heating in a sustainable and environmentally friendly way.
M. E. H. Tijani, S. Spoelstra
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Liquid-sodium thermoacoustic engine

Applied Physics Letters, 1988
We have constructed a thermoacoustic engine that uses liquid sodium as its working substance. The engine generates acoustic power using heat flowing from a high-temperature source to a low-temperature sink. The measured performance of this engine disagrees significantly with numerical calculations based on our theory of thermoacoustic engines.
A. Migliori, G. W. Swift
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Entrainment of two thermoacoustic engines

Journal of the Acoustical Society of America, 2016
In order to build more powerful sources of sound for energy conversion, the synchronization of two thermoacoustic heat engines has been studied. Experiments were performed on engines in the acoustic frequency range of 2.6 kHz and also on very small engines in the ultrasonic range of 24 kHz.
Orest G. Symko, Myra Flitcroft, Brenna Gillman, Ivan Rodriguez, Cedric C. Wilson   +4 more
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Streaming in thermoacoustic engines and refrigerators

AIP Conference Proceedings, 2000
The efficiency of thermoacoustic engines and refrigerators is now approaching 40% of the ideal efficiency allowed by the laws of thermodynamics. To achieve such high efficiency requires understanding and control of streaming. Sometimes, thermoacoustic phenomena cause unwanted streaming-driven convection of heat, which we strive to eliminate; in other ...
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Simulating a Thermoacoustic Engine With PyFR

2023
Thermoacoustic engines can convert heat into acoustic energy, generating powerful acoustic waves that can be used for electricity generation, cooling and additional uses. Simulating them and predicting their performance is a challenging task, due to the multiple length and time scales involved, the characteristics of the flow (compressible, transient),
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