Spray-Wall Interactions in a Small-Bore, Multi-Cylinder Engine Operating With Reactivity-Controlled Compression Ignition

Conference · Sun Oct 15 00:00:00 EDT 2017 · Proceedings of the Technical Conference of the ASME Internal Combusion Engine Division

DOI:https://doi.org/10.1115/ICEF2017-3607· OSTI ID:1427671

Wissink, Martin L.  ^[1]; Curran, Scott  ^[1]; Kavuri, Chaitanya ^[2]; Kokjohn, Sage ^[2]

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1. ORNL
2. University of Wisconsin, Madison

Experimental work on reactivity-controlled compression ignition (RCCI) in a small-bore, multi-cylinder engine operating on premixed iso-octane and direct-injected n-heptane has shown an unexpected combustion phasing advance at early injection timings, which has not been observed in large-bore engines operating under RCCI at similar conditions. In this work, computational fluid dynamics (CFD) simulations were performed to investigate whether spray-wall interactions could be responsible for this result. Comparison of the spray penetration, fuel film mass, and in-cylinder visualization of the spray from the CFD results to the experimentally measured combustion phasing and emissions provided compelling evidence of strong fuel impingement at injection timings earlier than -90 crank angle degrees (°CA) after top dead center (aTDC), and transition from partial to full impingement between -65 and -90°CA aTDC. Based on this evidence, explanations for the combustion phasing advance at early injection timings are proposed along with potential verification experiments.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1427671
• Journal Information: Proceedings of the Technical Conference of the ASME Internal Combusion Engine Division, Vol. 1, Issue none; Conference: ASME 2017 Internal Combustion Engine Division Fall Technical Conference , Seattle, Washington, United States of America, 10/15/2017 4:00:00 AM-10/18/2017 4:00:00 AM; Related Information: Paper No. ICEF2017-3607, pp. V001T03A010; 9 pages; ISSN 1524-9433
• Publisher: ASME
• Country of Publication: United States
• Language: English