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Investigation of the operating characteristics of a free-piston closed-cycle Joule engine generator with helium as working fluid [dataset] Open Access

As an emerging micro- or small-scale energy conversion technology, linear Joule engine generators (LJEGs) combine the advantages of external combustion engines and linear generators, feature the advantages of high thermal-to-electrical efficiency, multi-fuel potential, good operational flexibility, a simple and compact mechanical structure, and low frictional loss. Earlier research on LJEGs mainly focused on open-cycle systems, while closed-cycle LJEGs, which are the subject of this work, have some unique characteristics in comparison with open-cycle ones. Unfortunately, the operating features of closed-cycle LJEGs are still not well comprehended. To fill this gap, in this paper, the operating characteristics of a closed-cycle LJEG with helium as working fluid are investigated based on a validated numerical model. The dynamic characteristics and output performance of the system were investigated at different system pressures and compared with an open-cycle LJEG with air as working fluid. The outcomes reveal that the closed-cycle LJEG has a smaller piston stroke and higher output efficiency. Furthermore, the effect of key parameters such as valve timing, electrical resistance coefficient, and cylinder diameters on system performance is investigated. This study offers in-depth insights into the operation characteristics of the closed-cycle LJEG, which contributes to the design of similar systems.

Descriptions

Resource type

Dataset

Contributors

Creator: Zhu Shunmin ¹
Contact person: Zhu Shunmin ¹

¹ Durham University, UK

Funder

Engineering and Physical Sciences Research Council

Research methods

Other description

Keyword

Energy conversion
Free-piston
Linear Joule engine generator
Closed Brayton cycle
Helium

Subject

Energy conversion

Location

Language

Cited in

Identifier

ark:/32150/r10p096697r
doi:10.15128/r10p096697r

Rights

Creative Commons Attribution 4.0 International (CC BY)

Publisher

Durham University

Date Created

File Details

Depositor

S. Zhu

Date Uploaded

11 February 2025, 10:02:56

Date Modified

13 February 2025, 05:02:38

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Mime type: application/vnd.ms-excel

File size: 119565735

Last modified: 2025:02:12 09:24:20+00:00

Filename: Data_file-ECM_X-r10p096697r-version1.xlsx

Original checksum: 574fd58d9e3bf6a9c10897ff14626f5b