Isobaric Combustion: A Potential Path to High Efficiency, in Combination with the Double Compression Expansion Engine (DCEE) Concept

Babayev, Rafig; Houidi, Moez Ben; Andersson, Arne; Johansson, Bengt

doi:10.4271/2019-01-0085

Cited by 25 publications

(39 citation statements)

References 19 publications

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“…The IBLC reaches the same peak motored pressure (PMP) as the ICC while the IBHC reaches the same peak pressure. In general, the study is built on a previous metal engine study [20]. A similar geometry was used as compared to the metal studies.…”

Section: Experimental Methodologymentioning

confidence: 99%

“…The reduction from 15.4 to 12.5 is explained by blow-by losses. In the previous metal engine studies [20], a compression ratio of 17 was used.…”

Section: Experimental Methodologymentioning

confidence: 99%

Section: /20/2015mentioning

confidence: 99%

“…Other studies have suggested the potential of isobaric combustion in terms of high efficiency and low emissions [20]. In [20], the isobaric and conventional diesel combustions were compared. Conclusions showed similar efficiencies while, in isobaric combustion, NOx levels were diminished by 50 %, heat transfer losses reduced while exhaust energy and soot emissions increased.…”

Section: /20/2015mentioning

confidence: 99%

“…The optical engine study in this article is built upon earlier metal engine experiments [20]. With a compression ratio of 17:1, as compared to the 12.5:1 of the optical engine, a lower boost pressure and no heating was used.…”

Section: Earlier Metal Engine Experimentsmentioning

confidence: 99%

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Isobaric Combustion for High Efficiency in an Optical Diesel Engine

Nyrenstedt

Ramadan

Tang

et al. 2020

SAE Technical Paper Series

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Isobaric combustion has been proven a promising strategy for high efficiency as well as low nitrogen oxides emissions, particularly in heavy-duty Diesel engines. Previous single-cylinder research engine experiments have, however, shown high soot levels when operating isobaric combustion. The combustion itself and the emissions formation with this combustion mode are not well understood due to the complexity of multiple injections strategy. Therefore, experiments with an equivalent heavy-duty Diesel optical engine were performed in this study. Three different cases were compared, an isochoric heat release case and two isobaric heat release cases. One of the isobaric cases was boosted to reach the maximum in-cylinder pressure of the isochoric one. The second isobaric case kept the same boost levels as the isochoric case. Results showed that in the isobaric cases, liquid fuel was injected into burning gases. This resulted in shorter ignition delays and thus a poor mixing level. The lack of fuel/air mixing was clearly the main contributor to the high soot emissions observed in isobaric combustion. The lower heat losses of the isobaric strategy were further explained by tracking the chemiluminescence. Unlike a long single injection, multiple injections helped to contain the hot gases away from the walls. However, the opposite effects were also found from the high thermal radiation caused by the extensive soot formation. Highpressure fluctuations from the rapid heat release of the isochoric case were further seen. Finally, better mixing for improved air utilization was deemed needed when utilizing isobaric heat release.

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Section: Experimental Methodologymentioning

confidence: 99%

“…The reduction from 15.4 to 12.5 is explained by blow-by losses. In the previous metal engine studies [20], a compression ratio of 17 was used.…”

Section: Experimental Methodologymentioning

confidence: 99%