C131 Experimental Study on Acoustic Power Amplification by Wet-Walled Thermoacoustic Engine

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.

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The Exergy Efficiency and Output Acoustic Power Performance Optimization of the Thermoacoustic Engine Micro-Cycle

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.712-715.1609 ◽

2013 ◽

Vol 712-715 ◽

pp. 1609-1613 ◽

Cited By ~ 1

Author(s):

Jie Lin ◽

Feng Wu ◽

Jin Hua Fei ◽

Tuo Wang

Keyword(s):

Heat Resistance ◽

Objective Function ◽

Performance Optimization ◽

Finite Time ◽

Acoustic Power ◽

Exergy Efficiency ◽

Power Performance ◽

Thermoacoustic Engine ◽

The Relationship ◽

High Output

The relationship between exergy efficiency and output acoustic power of the thermoacoustic engine microcycle model which only was accounted for the heat resistance had been analyzed using finite time thermodynamics.And through the new objective function,we obtain the optimization that not only obtain high exergy efficiency but also high output acoustic power at the same time.Optimized imperfection that we only pursue the high exergy efficiency, we obtain low output acoustic power and vice versa.We approve this conclusion by numerical calculation.The results that we obtained will be useful to optimal the design of a actual thermoacoustic engine.

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Characterization of Piezoelectric Materials for Thermoacoustic Power Transduction

Volume 3: Combustion Science and Engineering ◽

10.1115/imece2008-67725 ◽

2008 ◽

Cited By ~ 1

Author(s):

A. Wekin ◽

C. Richards ◽

K. Matveev ◽

M. Anderson

Keyword(s):

Experimental Study ◽

Piezoelectric Materials ◽

Electrical Power ◽

Power Production ◽

Piezoelectric Transducers ◽

Maximum Power ◽

Small Scale ◽

Thermoacoustic Engine ◽

Thermoacoustic Engines

In this work an experimental study of the performance of piezoelectric transducers for power production from a small-scale thermoacoustic engine is presented. Four piezoelectric samples are identified and characterized. These samples are tested on a variable acoustic driver and electrical power produced is measured. Finally, the samples are tested on four experimental thermoacoustic engines to verify the results from the acoustic setup. The maximum power produced is 177 μW from a closed thermoacoustic engine coupled to a 15mm PZT disk.

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Experimental study on thermoacoustic refrigerators driven by a travelling-wave thermoacoustic engine

10.1063/1.1472099 ◽

2002 ◽

Author(s):

E. Luo

Keyword(s):

Experimental Study ◽

Travelling Wave ◽

Thermoacoustic Engine ◽

Thermoacoustic Refrigerators

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A TRAVELING WAVE THERMOACOUSTIC ENGINE - DESIGN AND TEST

ASME Letters in Dynamic Systems and Control ◽

10.1115/1.4049528 ◽

2021 ◽

pp. 1-9

Author(s):

Mitchell McGaughy ◽

Chengshi Wang ◽

Eric Boessneck ◽

Thomas Salem ◽

John R Wagner

Keyword(s):

Acoustic Wave ◽

Traveling Wave ◽

System Analysis ◽

Waste Heat ◽

Electrical Power ◽

Performance Testing ◽

Cost Effective ◽

Acoustic Power ◽

Consumer Products ◽

Thermoacoustic Engine

Abstract The demand for clean, sustainable, and cost-effective energy continues to increase due to global population growth and corresponding use of consumer products. The provision of heat to a thermoacoustic prime mover results in the generation of an acoustic wave that can be converted into electrical power. Thermoacoustic devices offer highly reliable and transportable power generation with low environmental impact using a variety of fuel sources. This paper focuses on the design and testing of a single stage, traveling wave, thermoacoustic engine. The system configuration, component design, and integration of sensors will be described. Performance testing and system analysis shows that for a 300 W heat source, the thermoacoustic machine generates a 54 Hz acoustic wave with a thermal efficiency of 7.8%. The system's acoustic power output may be increased by 84% through improved heat exchanger design. Tuning of the acoustic system and optimization of the bi-directional turbine merit attention to realize an applicable waste heat energy harvesting system.

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Experimental Study on a Thermoacoustic Engine with Brass Screen Stack Matrix

Advances in Cryogenic Engineering ◽

10.1007/978-1-4757-9047-4_88 ◽

1998 ◽

pp. 713-718 ◽

Cited By ~ 4

Author(s):

G. B. Chen ◽

T. Jin ◽

X. Bai ◽

L. Zhao ◽

L. Fang

Keyword(s):

Experimental Study ◽

Thermoacoustic Engine

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