Experimental study on tri-fuel combustion using premixed methane-hydrogen mixtures ignited by a diesel pilot
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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16
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International Journal of Hydrogen Energy, Volume 46, issue 40, pp. 21182-21197
Abstract
A comprehensive investigation on diesel pilot spray ignited methane-hydrogen (CH4–H2) combustion, tri-fuel combustion (TF), is performed in a single-cylinder compression ignition (CI) engine. The experiments provide a detailed analysis of the effect of H2 concentration (based on mole fraction, MH2) and charge-air temperature (Tair) on the ignition behavior, combustion stability, cycle-to-cycle (CCV) and engine performance. The results indicate that adding H2 from 0 to 60% shortens the ignition delay time (IDT) and combustion duration (based on CA90) up to 33% and 45%, respectively. Thereby, H2 helps to increase the indicated thermal efficiency (ITE) by as much as 10%. Furthermore, to gain an insight into the combustion stability and CCV, the short-time Fourier transform (STFT) and continuous wavelet transform (CWT) methodologies are applied to estimate the combustion stability and CCV of the TF combustion process. The results reveal that the pressure oscillation can be reduced up to 4 dB/Hz and the CCV by 50% when MH2 < 60% and Tair < 55 °C. However, when MH2 > 60% and Tair > 40 °C, abnormal combustion and knocking are observed.Description
Funding Information: The present study has been financially supported by the Academy of Finland (Grant Nos. 297248 and 318024 ) and Fortum-Neste Foundation (grant no. 2020050 ), which are gratefully acknowledged. The second author has also been financially supported by the Henry-Ford foundation under grant no. 202000063 . The authors are thankful to Ranta Olli and Blomstedt Otto for their supports on the engine preparations. Publisher Copyright: © 2021 The Authors
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Cheng, Q, Ahmad, Z, Kaario, O, Vuorinen, V & Larmi, M 2021, 'Experimental study on tri-fuel combustion using premixed methane-hydrogen mixtures ignited by a diesel pilot', International Journal of Hydrogen Energy, vol. 46, no. 40, pp. 21182-21197. https://doi.org/10.1016/j.ijhydene.2021.03.215