Novel 4-Stage Traveling Wave Thermoacoustic Power Generator

Blok, Kees de

doi:10.1115/fedsm-icnmm2010-30527

Cited by 84 publications

(69 citation statements)

References 3 publications

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“…Biwa et al 9) indicated that the use of multiple regenerators offers an easy and effective method of decreasing the onset temperature. De Blok 10) suggested a thermoacoustic system with a multistage PM with an expanded diameter to decrease the onset temperature. Shibata et al 11) succeeded in decreasing the onset temperature to be lower than that of a system with a uniform inner diameter by making a step-shape system.…”

Section: Introductionmentioning

confidence: 99%

Effect of expanded part length on quality value in straight-tube-type thermoacoustic system with a diameter-expanded prime mover

Egawa

Sakamoto

Orino

et al. 2018

Jpn. J. Appl. Phys.

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A thermoacoustic system with a diameter-expanded prime mover can drive a low onset temperature. A change in the expanded part length affects the onset temperature of the system. In this study, we focused on the change in the quality value of the system as it is a factor that affects the onset temperature. We investigated the relationship between the expanded part length and the quality value. The experimental and analysis results indicate that the changes in the expanded part length influence the amount of energy that dissipated in the system and the amount of energy conversion at the stack. In the system with expanded part length with a high-quality value, the amount of energy conversion at the stack is high and the amount energy that dissipated in the system is low. It is possible to design the expanded part length such that the onset temperature becomes low by using a quality value.

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Section: Introductionmentioning

confidence: 99%

Effect of expanded part length on quality value in straight-tube-type thermoacoustic system with a diameter-expanded prime mover

Egawa

Sakamoto

Orino

et al. 2018

Jpn. J. Appl. Phys.

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“…De Blok made a series of efforts to develop various travelling wave thermoacoustic engines [1,[7][8][9]. He proposed a traveling-wave thermoacoustic engine with coaxial configuration in 3 traveling wave thermoacoustic electric generator based on a flexure-bearing linear alternator for deep space application.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of a looped-tube travelling-wave thermoacoustic engine with a bypass pipe

Al-Kayiem

2016

Energy

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A new configuration ("a looped-tube with a bypass pipe") was recently proposed for low temperature travelling wave thermoacoustic engines and a prototype using atmospheric air as the working gas achieved an onset temperature difference as low as 65 °C. However, no further research has been reported about this new configuration to reveal its advantages and disadvantages. This paper aims to analyse this type of engine through a comprehensive numerical research. An engine of this type having dimensions similar to the reported prototype was firstly modelled. The calculated results were then qualitatively compared with the reported experimental data, showing a good agreement. The working principle of the engine was demonstrated and analysed. The research results show that an engine with such a bypass configuration essentially operates on the same thermodynamic principle as other travelling wave thermoacoustic engines, differing only in the design of the acoustic resonator.Both extremely short regenerators and a near-travelling wave resonator minimise the engine's acoustic losses, and thus significantly reduce its onset temperature difference. However, such short regenerators likely cause severe heat conduction losses, especially if the engine is applied to heat sources with higher temperatures. Furthermore, the acoustic power flowing back to the engine core is relatively low, while a large stream of acoustic power has to propagate within its resonator to maintain an acoustic resonance, potentially leading to low power density. The model was then applied to design an engine with a much longer regenerator and higher mean pressure to increase its power density. A thermoacoustic cooler was also added to the engine to utilise its acoustic power, allowing the evaluation of thermal efficiency. The pros and cons of the engine configuration are then discussed.

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“…9 The designed travelling-wave thermoacoustic engine with a feedback pipe (FBP) could start at a temperature difference of only 65 K. Recently, a multi-stage version of this type of engine was able to start at a temperature difference of only 40 K at each stage. 18 The acoustic power generated by the thermoacoustic engines from the heat input can be utilized in different ways. In general, it can be used for two main purposes: one is to directly convert the acoustic power to electricity through an electro-dynamic transduction mechanism; the other is to drive coolers or heat pumps, 5 which can be either thermoacoustic coolers (heat pumps) or pulsed-tube coolers.…”

Section: Literature Reviewmentioning

confidence: 99%

“…56 This arrangement has also the advantage of utilising low-grade heat source with a lower temperature difference across each stage. 9,18 The prototype uses air at two bar as the working gas and a commercially available high power woofer as an alternator. A schematic drawing of the prototype is shown in Figure 21a.…”

Section: Current and Future Workmentioning

confidence: 99%

Development of thermoacoustic devices for power generation and refrigeration

Jaworski

Mao

2013

Proceedings of the Institution of Mechanical Engineers, Part A:

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This paper is intended as a technical overview of the research and development work initially undertaken at the University of Manchester and subsequently transferred to the University of Leicester as part of the EPSRC-funded SCORE project (Stove for Cooking, Refrigeration and Electricity supply). The objectives of the work were twofold: Firstly, to develop an early demonstrator of a low-power electricity generator (to deliver approximately 10-20 W of electricity). This was to be based on the concept of using low-cost materials, working fluids and linear alternators suitable for deployment in rural areas of developing countries. The issues of concern here were the development of a suitable thermoacoustic engine topology and control measures; design of suitable heat exchanger configurations from initial use of electrical heaters to heat input through propane combustion; and characterisation of commercial loudspeakers to work as linear alternators and subsequent incorporation of selected models for engine prototyping purposes. These matters will be illustrated by a number of demonstrators and their testing in the laboratory environment. Secondly, to develop a demonstrator of a combustion driven thermoacoustic cooler for storage of vital medical supplies in remote and rural areas where there is no access to electricity grid. To this end, the paper will describe the design, construction and test results of an electrically driven demonstrator of a standing wave thermoacoustic engine coupled to a travelling wave thermoacoustic cooler. The final part of the paper will summarise the achievements to date and outline future work that has spun out from the original SCORE project. This will in particular include the current work on a scaled up version of electricity generator designed to deliver 100 W of electricity by using a two-stage engine configuration and the issues of integration of the thermoacoustic electricity generator and thermoacoustic cooler into one system.

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Novel 4-Stage Traveling Wave Thermoacoustic Power Generator

Cited by 84 publications

References 3 publications

Effect of expanded part length on quality value in straight-tube-type thermoacoustic system with a diameter-expanded prime mover

Effect of expanded part length on quality value in straight-tube-type thermoacoustic system with a diameter-expanded prime mover

Numerical investigation of a looped-tube travelling-wave thermoacoustic engine with a bypass pipe

Development of thermoacoustic devices for power generation and refrigeration

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