Stirling-Engine in a Novel Alphagamma Configuration – A Key for Maintenance-Free Operation

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aut.event.date2021-09-22 to 2021-09-23en_NZ
aut.event.place, Romeen_NZ
aut.researcherGschwendtner, Michael
dc.contributor.authorFrauscher, Jen_NZ
dc.contributor.authorDiermaier, Fen_NZ
dc.contributor.authorBrandt, H-Jen_NZ
dc.contributor.authorGschwendtner, Men_NZ
dc.date.accessioned2021-11-24T02:20:49Z
dc.date.available2021-11-24T02:20:49Z
dc.date.copyright2021-09-23en_NZ
dc.date.issued2021-09-23en_NZ
dc.description.abstractSince 2001, Frauscher Thermal Motors have been conducting research in the field of thermodynamic machines, in particular Stirling engines of various types. One important development step is the invention of a Stirling engine in an alphagamma® configuration. In this configuration, the expansion piston is designed as a differential piston with its ring surface connected to the cold volume. In this paper, the design advantages of the alphagamma® configuration in comparison with a traditional alpha configuration are shown analytically by using a polytropic model as a modification of the ideal adiabatic analysis. The findings were confirmed by also simulating the proposed alphagamma® configuration in a Sage model which was validated against experimental data with very good agreement. The results of both methods show that the counter-productive compression work can be reduced to almost zero – which makes the compression piston a displacer and explains the name alphagamma® – with the expansion work also reduced for the same net work output. As a consequence, the forces on the pistons, and thus, on the bearings can be significantly reduced, also leading to smaller piston side-loads, less friction and wear. The combination of all advantages allows the design of a mechanically sound and inexpensive machine.
dc.identifier.citationE3S Web Conf., 313 (2021) 08006, DOI: https://doi.org/10.1051/e3sconf/202131308006
dc.identifier.doi10.1051/e3sconf/202131308006
dc.identifier.urihttps://hdl.handle.net/10292/14719
dc.publisherEDP Sciences
dc.relation.urihttps://www.e3s-conferences.org/articles/e3sconf/abs/2021/89/e3sconf_isec2021_08006/e3sconf_isec2021_08006.html
dc.rights© The Authors, published by EDP Sciences, 2021. This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
dc.rights.accessrightsOpenAccessen_NZ
dc.titleStirling-Engine in a Novel Alphagamma Configuration – A Key for Maintenance-Free Operationen_NZ
dc.typeConference contribution
pubs.elements-id440818
pubs.organisational-data/AUT
pubs.organisational-data/AUT/Faculty of Design & Creative Technologies
pubs.organisational-data/AUT/PBRF
pubs.organisational-data/AUT/PBRF/PBRF Design and Creative Technologies
pubs.organisational-data/AUT/PBRF/PBRF Design and Creative Technologies/PBRF ECMS
pubs.organisational-data/AUT/zAcademic Progression
pubs.organisational-data/AUT/zAcademic Progression/AP - Design and Creative Technologies
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