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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2020 The Authors. In this work, we present the experimental results obtained from hydrogen fuelled spark-ignited dual piston free-piston engine generator (FPEG) prototype operated in two-stroke and four-stroke mode. The FPEG testing was successfully conducted at 3.7 compression ratio, engine speed between 5 Hz and 11 Hz and with different equivalence ratios. The FPEG technical details, experimental set-up and operational control are explained in detail. Performance indicators show that both equivalence ratio and engine speed affect the engine operation characteristics. For every set of specified FPEG parameters, appropriate range of equivalence ratio is recommended to prevent unwanted disturbance to electric generator operation. Both two-stroke and four-stroke cycle mode were tested, and the results showed different combustion characteristics with the two thermodynamic cycles. Four-stroke cycle mode could operate with indicated thermal efficiency gain up to 13.2% compared with the two-stroke cycle.
Author(s): Ngwaka U, Smallbone A, Jia B, Lawrence C, Towell B, Roy S, KV S, Roskilly AP
Publication type: Article
Publication status: Published
Journal: International Journal of Hydrogen Energy
Pages: Epub ahead of print
Online publication date: 12/03/2020
Acceptance date: 09/02/2020
Date deposited: 02/04/2020
ISSN (print): 0360-3199
ISSN (electronic): 1879-3487
Publisher: Elsevier Ltd
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