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dc.contributor.authorTang, Qinglong
dc.contributor.authorSampath, Ramgopal
dc.contributor.authorSharma, Priybrat
dc.contributor.authorNyrenstedt, Gustav
dc.contributor.authorAlRamadan, Abdullah
dc.contributor.authorBen Houidi, Moez
dc.contributor.authorBadra, Jihad
dc.contributor.authorJohansson, Bengt
dc.contributor.authorMagnotti, Gaetano
dc.date.accessioned2020-06-07T07:06:10Z
dc.date.available2020-06-07T07:06:10Z
dc.date.issued2020-04-14
dc.identifier.citationTang, Q., Sampath, R., Sharma, P., Nyrenstedt, G., Al Ramadan, A., Ben Houidi, M., … Magnotti, G. (2020). Optical Study on the Fuel Spray Characteristics of the Four-Consecutive-Injections Strategy Used in High-Pressure Isobaric Combustion. SAE Technical Paper Series. doi:10.4271/2020-01-1129
dc.identifier.issn0148-7191
dc.identifier.doi10.4271/2020-01-1129
dc.identifier.urihttp://hdl.handle.net/10754/663214
dc.description.abstractHigh-pressure isobaric combustion used in the double compression expansion engine (DCEE) concept was proposed to obtain higher engine brake thermal efficiency than the conventional diesel engine. Experiments on the metal engines showed that four consecutive injections delivered by a single injector can achieve isobaric combustion. Improved understanding of the detailed fuel-air mixing with multiple consecutive injections is needed to optimize the isobaric combustion and reduce engine emissions. In this study, we explored the fuel spray characteristics of the four-consecutive-injections strategy using high-speed imaging with background illumination and fuel-tracer planar laser-induced fluorescence (PLIF) imaging in a heavy-duty optical engine under non-reactive conditions. Toluene of 2% by volume was added to the n-heptane and served as the tracer. The fourth harmonic of a 10 Hz Nd:YAG laser was applied for the excitation of toluene. The PLIF image distortion caused by the side window curvature and the optical piston was mitigated using a correction lens and corrected with a grid mapping technique. The effects of hydraulic delay and injection dwell on the in-cylinder liquid-phase fuel penetration and vapor-phase fuel distribution were evaluated under different combinations of the four direct injections. The high-speed imaging of the liquid-phase spray shows that a short injection dwell reduces the hydraulic delay of the injector, resulting in an increase in both the peak liquid-phase penetration length and the injection duration. The fuel-tracer PLIF imaging clarifies the spatial fuel distribution of the four consecutive injections involved with the interaction between the vapor-phase spray and the piston bowl wall and the squish region. The intensity distribution in the PLIF images confirms that a longer injector hydraulic delay leads to a shorter peak vapor-phase spray penetration length and a reduced flow rate.
dc.publisherSAE International
dc.relation.urlhttps://www.sae.org/content/2020-01-1129/
dc.rightsArchived with thanks to SAE International
dc.titleOptical Study on the Fuel Spray Characteristics of the Four-Consecutive-Injections Strategy Used in High-Pressure Isobaric Combustion
dc.typeConference Paper
dc.contributor.departmentClean Combustion Research Center
dc.contributor.departmentMechanical Engineering
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.rights.embargodate2020-10-14
dc.conference.date2020-04-21 to 2020-04-23
dc.conference.nameSAE 2020 World Congress Experience, WCX 2020
dc.conference.locationDetroit, MI, USA
dc.eprint.versionPost-print
dc.contributor.institutionSaudi Aramco
dc.identifier.volume2020-April
dc.identifier.issueApril
kaust.personTang, Qinglong
kaust.personSampath, Ramgopal
kaust.personSharma, Priybrat
kaust.personNyrenstedt, Gustav
kaust.personAlRamadan, Abdullah
kaust.personBen Houidi, Moez
kaust.personJohansson, Bengt
kaust.personMagnotti, Gaetano
dc.identifier.eid2-s2.0-85083850195
refterms.dateFOA2020-06-07T12:01:16Z


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