Generalized thermoacoustic heat engines with unconventional working substances: A review

Huang, Jiale; Yang, Rui; Yang, Yupeng; Zhou, Qiang; Luo, Ercang

doi:10.1016/j.apenergy.2023.121447

Cited by 19 publications

(4 citation statements)

References 162 publications

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“…To take this effect into account, numerical simulations are carried out by the commercial software Comsol Multiphysics to solve the nonlinear equations, i.e., Eqs. ( 8) and (9). Detailed solution procedures can be found in Ref.…”

Section: Discussion Of Boundary Conditions For a Multi-stage Configur...mentioning

confidence: 99%

“…[6][7][8] Up to now, most thermoacoustic engines use gases as the working media. 9) Limited by the high compressibility of gases, high-pressure systems are generally adopted in order to enhance energy density, [10][11][12] which increases the difficulty in system design and poses great challenges to the longterm operation of systems. Instead of being limited to fluids, solids have been proposed as the media for thermoacoustic conversion by Hao et al from Purdue University.…”

Section: Introductionmentioning

confidence: 99%

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Acoustic characteristics and performance analysis of a solid-state thermoacoustic oscillator

Luo,

Zhou,

Jin

2023

Jpn. J. Appl. Phys.

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Thermoacoustic instability in solids paves the way for the development of solid-state thermoacoustic (SSTA) engines with superior reliability. Acoustic characteristics with respect to the performance of SSTA oscillators are investigated, where growth ratio is taken as a performance metric. Numerical analyses show that the acoustic characteristics not only determine the temperature gradient direction for strengthening the oscillation, but also affect the maximum growth ratio. A high growth ratio is obtained at a low angular frequency and an acoustic field around 1/8 wavelength from the strain antinode. To realize appropriate acoustic characteristics, the angular frequencies and acoustic fields under different boundary conditions are studied, based on which the method to adjust the acoustic characteristics is discussed. This work aims to reveal the relationship between the acoustic characteristics and the performance of SSTA oscillators, and to provide new insights on adjusting the acoustic characteristics for improving SSTA oscillators.

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Section: Discussion Of Boundary Conditions For a Multi-stage Configur...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Acoustic characteristics and performance analysis of a solid-state thermoacoustic oscillator

Luo,

Zhou,

Jin

2023

Jpn. J. Appl. Phys.

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“…It is important to acknowledge that thermoacoustic systems utilize non-traditional working substances due to the unique advantages as compared to the conventional thermoacoustic systems. The benefits are evidenced in enhancing the efficiency and demonstrated better capacity for utilization in the recovery of low-grade heat [12]. Normally, the established fluid dynamics of flow in multiple conventional systems served as a point of reference for predicting fluid dynamics behaviors.…”

Section: Introductionmentioning

confidence: 99%

Vibration-Induced Flow and Streaming in Oscillatory Flow of Thermoacoustics

Azman Hafiidz Aji,

Fatimah Al Zahrah Mohd Saat,

Fadhilah Shikh Anuar

et al. 2024

ARFMTS

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Induced acoustic streaming flow in thermoacoustic systems occurs due to acoustic vibrations, causing changes to the mean flow in the systems. This phenomenon creates a tendency to generate net fluid flow that can cause energy change within certain areas inside the system. However, the effects of the entire system’s vibrations on the flow streaming are not yet fully understood, yet it is important for a more effective operation. This study experimentally investigated the flow streaming resulting from vibration in a standing-wave thermoacoustic test rig with a flow frequency of 23.6 Hz. The existence of flow streaming due to vibration which was not counted in the theoretical formula is shown and indicated by experimental values. The result shows that there is a correlation between the amplitude of the drive ratio (DR) and the velocity of the oscillation of the flow. Upon examining both the theoretical and the practical evidence, it becomes clear that there exists a marginal flow velocity in directions other than the main flow due to the vibration of resonator’s wall as measured at the intake and outflow areas of the stack. This marginal flow velocity amplifies as the drive ratio of flow increases and it may potentially explain the observed difference between measured flow amplitude and the theoretical value.

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“…The vibration power that supplies the generator [1] can be provided by a large number of different processes, deriving from either renewable or non-renewable primary sources, such as heat, wind, sea waves [2] and currents, and rivers. An extensive review of the newest thermoacoustic applications is given in [3].…”

Section: Introductionmentioning

confidence: 99%

A Liquid Metal Alternate MHD Disk Generator

Alemany,

Brekis,

Montisci

2023

Sustainability

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In this paper, an electrical generator is presented for the exploitation of alternating energy. Some renewable sources are directly available in such forms, such as the wave power obtainable from the sea, but most of them can be converted to alternative forms; therefore, the proposed generator can be applied to different kinds of renewable sources. In particular, the proposed system is thought to be coupled with a thermoacoustic engine, which converts heat into mechanical vibration without using solid moving parts. This opens the proposed system to the use of most thermal sources, such as solar radiation, waste recovery, geothermic, car exhaust, and others. The object of of this present work concerns the transformation of alternating mechanical energy into electricity by using a specific type of magnetohydrodynamic (MHD) disk generator. The functioning of this generator is based on the interaction between a DC magnetic field embedded in a disk structure and a conducting fluid held in an inner channel. A simplified model of the generator is presented here, and a sensitivity analysis is performed. It is shown that, under specific operating conditions, the efficiency of the system can reach 70% with a level of power of hundreds of watts.

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Generalized thermoacoustic heat engines with unconventional working substances: A review

Cited by 19 publications

References 162 publications

Acoustic characteristics and performance analysis of a solid-state thermoacoustic oscillator

Acoustic characteristics and performance analysis of a solid-state thermoacoustic oscillator

Vibration-Induced Flow and Streaming in Oscillatory Flow of Thermoacoustics

A Liquid Metal Alternate MHD Disk Generator

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