scholarly journals Comparison of acoustic power amplification by wet/dry-walled thermoacoustic engine

10.3990/2.286 ◽  
2015 ◽  
Author(s):  
M. Senga ◽  
Y. Ashigaki ◽  
S. Hasegawa
Keyword(s):  
Acoustic Power ◽  
Thermoacoustic Engine ◽  
Power Amplification

Acoustic Power Amplification by Thermoacoustic Engine with Gas-Liquid Phase Change

2019 ◽  
Vol 2019.24 (0) ◽  
pp. E123
Author(s):  
Yuichi OHNO ◽  
Koichi YANAGISAWA ◽  
Kazuhide UCHIDA ◽  
Yasumasa HAGIWARA ◽  
Takuya FUSE ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Phase Change ◽  
Acoustic Power ◽  
Thermoacoustic Engine ◽  
Power Amplification

Acoustic power amplification by thermoacoustic engine with gas-liquid phase change

2019 ◽  
Vol 2019.24 (0) ◽  
pp. E124
Author(s):  
Koichi YANAGISAWA ◽  
Junya ONISHI ◽  
Naoki SHIKAZONO ◽  
Yasumasa Hagiwara ◽  
Takuya FUSE ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Phase Change ◽  
Acoustic Power ◽  
Thermoacoustic Engine ◽  
Power Amplification

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

2013 ◽  
Vol 712-715 ◽  
pp. 1609-1613 ◽  
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.

A TRAVELING WAVE THERMOACOUSTIC ENGINE - DESIGN AND TEST

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.

scholarly journals The effect of mean pressure on the performance of a single-stage heat-driven thermoacoustic cooler

2020 ◽  
Vol 15 (3) ◽  
pp. 471-476
Author(s):  
Irna Farikhah
Keyword(s):  
High Efficiency ◽  
Waste Heat ◽  
Heating Temperature ◽  
Acoustic Power ◽  
Environmental Issue ◽  
Thermoacoustic Engine ◽  
Limit Value ◽  
The World ◽  
Mean Pressure ◽  
Thermoacoustic Cooler

Abstract Waste heat is an environmental issue in the world. There are some technologies that can be used to recovery the waste heat, one of which is thermoacoustic cooler technology. Thermoacoustic technology can be divided into two parts: one is thermoacoustic engine and cooler. To design the cooler system having high efficiency and lower onset heating temperature, the effect of mean pressure is investigated. By increasing mean pressure from 0.5 to 3 MPa, the heating temperature generating acoustic power can be decreased from 831 to 580 K. Moreover, 15% of Thermodynamic upper limit value of the whole cooler system is achieved.

scholarly journals Design of a Low-Cost Thermoacoustic Electricity Generator and Its Experimental Verification

2010 ◽  
Author(s):  
Zhibin Yu ◽  
Artur J. Jaworski ◽  
Scott Backhaus
Keyword(s):  
Experimental Verification ◽  
Low Cost ◽  
Preliminary Test ◽  
Detailed Comparison ◽  
Acoustic Power ◽  
Travelling Wave ◽  
Test Results ◽  
Thermoacoustic Engine ◽  
Design And Testing ◽  
Different Parts

This paper describes the design and testing of a low cost thermoacoustic generator. A travelling-wave thermoacoustic engine with a configuration of a looped-tube resonator is designed and constructed to convert heat to acoustic power. A commercially available, low-cost loudspeaker is adopted as the alternator to convert the engine’s acoustic power to electricity. The whole system is designed using linear thermoacoustic theory. The optimization of different parts of the thermoacoustic generator, as well as the matching between the thermoacoustic engine and the alternator are discussed in detail. A detailed comparison between the preliminary test results and linear thermoacoustic predictions is provided.

Development of Combustion-Driven Thermoacoustic Engine

2008 ◽  
Author(s):  
Najmeddin Shafrei Tehrany ◽  
Chien Shung Lin ◽  
Cory Bloomquist ◽  
Jeongmin Ahn ◽  
Konstantin Matveev
Keyword(s):  
Heat Transfer ◽  
Acoustic Power ◽  
High Energy ◽  
High Energy Density ◽  
Small Scale ◽  
Developmental Study ◽  
Prime Mover ◽  
Power Devices ◽  
Thermoacoustic Engine ◽  
Thermoacoustic Engines

Miniature thermoacoustic engines driven by combustion and producing electricity are promising candidates for small-scale power devices. The elemental development of the system including a small thermoacoustic engine and a Swiss roll combustor is discussed in this work. A standing-wave thermoacoustic prime mover consists of a resonator with a stack of porous material inside where a temperature gradient is maintained. This engine generates acoustic power from heat. The sound energy can be converted in electricity by an electroacoustic transformer. The Swiss roll combustor utilizes the high energy density of hydrocarbon fuels in order to provide the necessary heat transfer required to generate acoustic power from the engine. Some results of this developmental study are presented.

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