Spray–Wall Interactions in a Small-Bore, Multicylinder Engine Operating With Reactivity-Controlled Compression Ignition
Abstract
Experimental work on reactivity-controlled compression ignition (RCCI) in a small-bore, multicylinder 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 study, 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 (deg CA) after top dead center (aTDC), and transition from partial to full impingement between -65 and -90 deg CA aTDC. Finally, based on this evidence, explanations for the combustion phasing advance at early injection timings are proposed along with potential verification experiments.
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. of Wisconsin, Madison, WI (United States). Department of Mechanical Engineering
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Bioenergy Technologies Office; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
- OSTI Identifier:
- 1474583
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Engineering for Gas Turbines and Power
- Additional Journal Information:
- Journal Volume: 140; Journal Issue: 9; Journal ID: ISSN 0742-4795
- Publisher:
- ASME
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; Combustion; Fuels; Engines; Silicon-on-insulator; Computational fluid dynamics; Sprays; Compression; Ignition; Emissions; Cylinders
Citation Formats
Wissink, Martin L., Curran, Scott J., Kavuri, Chaitanya, and Kokjohn, Sage L. Spray–Wall Interactions in a Small-Bore, Multicylinder Engine Operating With Reactivity-Controlled Compression Ignition. United States: N. p., 2018.
Web. doi:10.1115/1.4039817.
Wissink, Martin L., Curran, Scott J., Kavuri, Chaitanya, & Kokjohn, Sage L. Spray–Wall Interactions in a Small-Bore, Multicylinder Engine Operating With Reactivity-Controlled Compression Ignition. United States. https://doi.org/10.1115/1.4039817
Wissink, Martin L., Curran, Scott J., Kavuri, Chaitanya, and Kokjohn, Sage L. Mon .
"Spray–Wall Interactions in a Small-Bore, Multicylinder Engine Operating With Reactivity-Controlled Compression Ignition". United States. https://doi.org/10.1115/1.4039817. https://www.osti.gov/servlets/purl/1474583.
@article{osti_1474583,
title = {Spray–Wall Interactions in a Small-Bore, Multicylinder Engine Operating With Reactivity-Controlled Compression Ignition},
author = {Wissink, Martin L. and Curran, Scott J. and Kavuri, Chaitanya and Kokjohn, Sage L.},
abstractNote = {Experimental work on reactivity-controlled compression ignition (RCCI) in a small-bore, multicylinder 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 study, 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 (deg CA) after top dead center (aTDC), and transition from partial to full impingement between -65 and -90 deg CA aTDC. Finally, based on this evidence, explanations for the combustion phasing advance at early injection timings are proposed along with potential verification experiments.},
doi = {10.1115/1.4039817},
journal = {Journal of Engineering for Gas Turbines and Power},
number = 9,
volume = 140,
place = {United States},
year = {Mon Jul 30 00:00:00 EDT 2018},
month = {Mon Jul 30 00:00:00 EDT 2018}
}
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