Optimizing bidirectional impulse turbines for thermoacoustic engines

2020 ◽  
Vol 147 (4) ◽  
pp. 2348-2356 ◽  
Author(s):  
Michael A. G. Timmer ◽  
Theo H. van der Meer
Keyword(s):  
Thermoacoustic Engines

A high frequency, power, and efficiency diaphragm acoustic-to-electric transducer for thermoacoustic engines and refrigerators

2021 ◽  
Vol 149 (2) ◽  
pp. 948-959
Author(s):  
Thomas W. Steiner ◽  
Keith B. Antonelli ◽  
Geoffrey D. S. Archibald ◽  
Briac De Chardon ◽  
Kristjan T. Gottfried ◽  
...  
Keyword(s):  
High Frequency ◽  
High Frequency Power ◽  
Thermoacoustic Engines ◽  
Frequency Power

Modeling of Thermoacoustic Resonators With Nonuniform Medium and Boundary Conditions

2011 ◽  
Vol 133 (3) ◽  
Author(s):  
Konstantin I. Matveev ◽  
Sungmin Jung
Keyword(s):  
Boundary Conditions ◽  
Acoustic Power ◽  
Solid Surfaces ◽  
Small Scale ◽  
Nonuniform Medium ◽  
Thermoacoustic Engine ◽  
Efficient Calculation ◽  
Thermoacoustic Engines ◽  
The Subject ◽  
Low Amplitude

The subject of this paper is modeling of low-amplitude acoustic fields in enclosures with nonuniform medium and boundary conditions. An efficient calculation method is developed for this class of problems. Boundary conditions, accounting for the boundary-layer losses and movable walls, are applied near solid surfaces. The lossless acoustic wave equation for a nonuniform medium is solved in the bulk of the resonator by a finite-difference method. One application of this model is for designing small thermoacoustic engines. Thermoacoustic processes in the regular-geometry porous medium inserted in resonators can be modeled analytically. A calculation example is presented for a small-scale thermoacoustic engine coupled with an oscillator on a flexing wall of the resonator. The oscillator can be used for extracting mechanical power from the engine. A nonuniform wall deflection may result in a complicated acoustic field in the resonator. This leads to across-the-stack variations of the generated acoustic power and local efficiency of thermoacoustic energy conversion.

The Effect of Gravity on Heat Transfer by Rayleigh Streaming in Pulse Tubes and Thermal Buffer Tubes

2004 ◽  
Author(s):  
Konstantin I. Matveev ◽  
Scott Backhaus ◽  
Gregory W. Swift
Keyword(s):  
Heat Transfer ◽  
Analytical Model ◽  
Thermal Energy ◽  
Heat Exchangers ◽  
Acoustic Energy ◽  
Heat Leak ◽  
Thermoacoustic Engines ◽  
Different Temperatures ◽  
Rayleigh Streaming ◽  
Streaming Flow

Thermoacoustic engines and refrigerators use the interaction between heat and sound to produce acoustic energy or to transport thermal energy. Heat leaks in thermal buffer tubes and pulse tubes, components in thermoacoustic devices that separate heat exchangers at different temperatures, reduce the efficiency of these systems. At high acoustic amplitudes, Rayleigh mass streaming can become the dominat means for undesirable heat leak. Gravity affects the streaming flow patterns and influences streaming-induced heat convection. A simplified analytical model is constructed that shows gravity can reduce the streaming heat leak dramatically.

Thermoacoustic Engines

2007 ◽  
pp. 695-701 ◽  
Author(s):  
Gregory W. Swift
Keyword(s):  
Thermoacoustic Engines

Mixture Working Gases in Thermoacoustic Engines for Different Applications

2012 ◽  
Vol 33 (7) ◽  
pp. 1143-1163 ◽  
Author(s):  
Hanbing Ke ◽  
Yaling He ◽  
Yingwen Liu ◽  
Fuqing Cui
Keyword(s):  
Thermoacoustic Engines

Investigation of harmonic generation in thermoacoustic engines

2003 ◽  
Vol 114 (4) ◽  
pp. 2329-2329
Author(s):  
James E. Parker ◽  
Mark F. Hamilton ◽  
Yurii A. Ilinskii
Keyword(s):  
Harmonic Generation ◽  
Thermoacoustic Engines

Thermoacoustic engines as self-powered sensors within a nuclear reactor

2014 ◽  
Vol 135 (4) ◽  
pp. 2275-2276
Author(s):  
Steven L. Garrett ◽  
Randall A. Ali ◽  
James A. Smith
Keyword(s):  
Nuclear Reactor ◽  
Thermoacoustic Engines ◽  
Self Powered
Sign in / Sign up

Export Citation Format

Share Document