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Gap seal dissipation in linear alternators.

Authors
  • Gonen, Eran
  • Grossman, Gershon
Type
Published Article
Journal
The Journal of the Acoustical Society of America
Publication Date
Apr 01, 2015
Volume
137
Issue
4
Pages
1744–1755
Identifiers
DOI: 10.1121/1.4916891
PMID: 25920827
Source
Medline
License
Unknown

Abstract

Earlier models of the coupling between a thermoacoustic system and an electrodynamic motor/alternator considered mechanical damping but ignored the viscous friction and blow-by losses produced by the motor/alternator's piston oscillating within a tight-fitting gap. The model presented here extends previous models to demonstrate that the inclusion of these effects leads to a better estimate of the electroacoustic conversion efficiency and can be used to determine the optimal load resistance for such an alternator's electrical power output. Model predictions were shown to be in excellent agreement with the performance measurements made using two different thermoacoustic engines and using a sealed volume (dummy load) connected to multiple, horizontally opposed motor/alternators, using an empirical determination of the piston-cylinder gap.

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