TY - GEN
T1 - Spray-wall interactions in a small-bore, multi-cylinder engine operating with reactivity-controlled compression ignition
AU - Wissink, Martin L.
AU - Curran, Scott J.
AU - Kavuri, Chaitanya
AU - Kokjohn, Sage L.
N1 - Publisher Copyright:
Copyright © 2017 ASME.
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85040061766&partnerID=8YFLogxK
U2 - 10.1115/ICEF2017-3607
DO - 10.1115/ICEF2017-3607
M3 - Conference contribution
AN - SCOPUS:85040061766
T3 - ASME 2017 Internal Combustion Engine Division Fall Technical Conference, ICEF 2017
BT - Large Bore Engines; Fuels; Advanced Combustion
PB - American Society of Mechanical Engineers
T2 - ASME 2017 Internal Combustion Engine Division Fall Technical Conference, ICEF 2017
Y2 - 15 October 2017 through 18 October 2017
ER -