A high frequency cascade thermoacoustic engine

Hu, Zhenzhen; Li, Qing; Li, Qiang; Li, Zheng Yu

doi:10.1016/j.cryogenics.2006.07.002

Cited by 15 publications

(10 citation statements)

References 6 publications

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“…Since then, more and more attention has been paid to thermoacoustic engines in the heat engine field [2,3]. A TE can be used to drive loads such as pulse tube coolers (PTCs) [4], thermoacoustic refrigerators [5], generators [6], and others [7]. Obviously, it is very important to transfer the acoustic power from the TE to the load efficiently.…”

Section: Introductionmentioning

confidence: 99%

A passive network model for large diameter thermoacoustic tube systems and its experimental verification

et al. 2010

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Section: Introductionmentioning

confidence: 99%

A passive network model for large diameter thermoacoustic tube systems and its experimental verification

et al. 2010

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“…Due to the simplicity and reasonable efficiency of such a straight‐line configuration, the compact cascade thermoacoustic engine was re‐designed and constructed by Hu et al It was operated at high frequency of 500 Hz and high pressure of helium. Because of its high frequency operation, the compact cascade engine was designed with 1 standing‐wave unit and 1 travelling‐wave unit.…”

Section: Introductionmentioning

confidence: 99%

Design and experimental evaluation of a travelling-wave thermoacoustic refrigerator driven by a cascade thermoacoustic engine

Dhuchakallaya

Saechan

2017

Int J Energy Res

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Summary A travelling‐wave thermoacoustic refrigerator driven by a cascade thermoacoustic engine is evaluated experimentally in this paper. A prototype is developed under the constraint of a low‐cost and less complicated device. In order to reduce the total budget, commercial materials and standard parts are selected, and air at atmospheric pressure is used as working fluid in the system. The thermoacoustic coupled engine‐refrigerator system consists of 1 standing‐wave unit, 1 travelling‐wave unit, and 1 travelling‐wave refrigerator arranged in a linear configuration. A resonator‐tube is connected at each end of the thermoacoustic core. The effects of the length and hydraulic radius of the regenerator in the refrigerator on the cooling performance are investigated at different levels of input power. In the experimental results, the maximum temperature difference of 17.6°C was realised at the no‐load condition. The maximum coefficient of performance relative to Carnot (COPR) of 2.4% was accomplished at the cooling load of 13 W.

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“…The effect of imaginary dissipation load on the acoustic field was also investigated. Hu et al designed and built a miniature CTE. The diameter ratio of stages was analysed to obtain the efficient device.…”

Section: Introductionmentioning

confidence: 99%

“…The diameter ratio of stages was analysed to obtain the efficient device. Such cascade engines discussed in were designed to operate at high pressure of helium, and had the same configuration which consisted of one standing wave stage and one travelling wave stage in series.…”

Section: Introductionmentioning

confidence: 99%

The performance improvement of a cascade thermoacoustic engine by adjusting the acoustic impedance in the regenerator

Dhuchakallaya

Saechan

Rattanadecho

2016

Int. J. Energy Res.

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Summary A novel cascade configuration consisting of one standing wave unit and one travelling wave unit arranged in series is studied in this paper. Theoretically, a straight‐line cascade engine provides an efficient energy conversion, reduces the difficulties of fabrication and allows no Gedeon streaming. In order to achieve such a powerful cascade thermoacoustic engine, the regenerator of the travelling wave unit must be operated in high impedance and travelling wave phasing region. Various techniques of phase adjustment by modifying the configurations and geometrical dimensions of the system are investigated both numerically and experimentally in order to adjust the position of the sweet spot as well as to promote the acoustic impedance in the regenerator. It is found that the effective tuning methods with less modification here are accomplished by changing the volume of down‐cavity and reducing the flow area of down‐resonator by inserting the pencil. The exploration also shows that the acoustic field in the system is quite sensitive to the effect of down‐resonator length. The performance of the proposed system is clearly improved after the phase‐adjustment schemes are completely implemented, in which the regenerator works within the sweep spot zone with high acoustic impedance. Copyright © 2016 John Wiley & Sons, Ltd.

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A high frequency cascade thermoacoustic engine

Cited by 15 publications

References 6 publications

A passive network model for large diameter thermoacoustic tube systems and its experimental verification

A passive network model for large diameter thermoacoustic tube systems and its experimental verification

Design and experimental evaluation of a travelling-wave thermoacoustic refrigerator driven by a cascade thermoacoustic engine

The performance improvement of a cascade thermoacoustic engine by adjusting the acoustic impedance in the regenerator

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