Transition from HCCI to PPC: Investigation of Fuel Distribution by Planar Laser Induced Fluorescence (PLIF)

Wang, Zhenkan; Lönn, Sara Larsson; Matamis, Alexios; Andersson, Öivind; Tunér, Martin; Aldén, Marcus; Richter, Mattias

doi:10.4271/2017-01-0748

Cited by 18 publications

(2 citation statements)

References 27 publications

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“…Thus, these two parts are corrected separately based on the grid-mapping using MATLAB image processing toolbox. A similar correction procedure can be found in our previous work [14] and the works of Wang et al [15] and Miles et al [16]. Finally, the two parts of the distortions-corrected images were combined and a mask with the piston top and bowl boundary was applied to the image to show the spatial relationship between the fuel jet and the piston bowl.…”

Section: Fuel-tracer Plif Imagingmentioning

confidence: 94%

Optical Study on the Fuel Spray Characteristics of the Four-Consecutive-Injections Strategy Used in High-Pressure Isobaric Combustion

Tang

Sampath

Sharma

et al. 2020

SAE Technical Paper Series

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High-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-consecutiveinjections 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.

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Section: Fuel-tracer Plif Imagingmentioning

confidence: 94%

Optical Study on the Fuel Spray Characteristics of the Four-Consecutive-Injections Strategy Used in High-Pressure Isobaric Combustion

Tang

Sampath

Sharma

et al. 2020

SAE Technical Paper Series

View full text Add to dashboard Cite

show abstract

“…They predicted that most of the UHC and CO emissions originated from the overly lean mixture (0.1 < ϕ < 0.5) in the piston bowl and squish region and that a small part of CO derived from the overly rich mixture (1.0 < ϕ < 1.4) in the squish region. Wang et al 23 studied the spray−wall interaction under different fuel injection timings by qualitative fuel-tracer PLIF imaging. They believed that the fuel-trapping effect in the squish region was responsible for the increased UHC and CO emissions when using early fuel injection timings.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effects of Spray–Wall Interaction on Partially Premixed Combustion and Engine Emissions

et al. 2019

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We investigated the detailed spray-wall interaction in partially premixed combustion (PPC) in an optical engine with a wide-angle injector at low engine load. The fuel-trapping effect of the piston topland crevice was visualized by fuel-tracer planar laser-induced fluorescence (PLIF) for the first time. In agreement with the fuel distribution shown by PLIF, the combustion region first moves into the squish region and then tends to move back to the piston bowl when advancing the injection timings. Results indicate that a considerable portion of the fuel is trapped in the piston top-land crevice for the cases with injection timings at -30° (SOI-30 case) and -40° (SOI-40 case) CA aTDC. The SOI-40 case with earlier injection timing presents a backflow process of the trapped fuel from the piston top land crevice to the squish region. However, there is not enough time for the fuel vapor to flow back before the start of combustion for the SOI-30 case, resulting in a relatively lower fuel-air equivalence ratio in the squish region and thus higher CO emission than the SOI-40 case. This study provides insights into the fuel distribution characteristics in piston crevice and the potential effects on the engine emissions under PPC condition.

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Combustion in Diesel Fuelled Partially Premixed Compression Ignition Engines

Chintagunti

Ágarwal

2021

Energy, Environment, and Sustainability

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Transition from HCCI to PPC: Investigation of Fuel Distribution by Planar Laser Induced Fluorescence (PLIF)

Cited by 18 publications

References 27 publications

Optical Study on the Fuel Spray Characteristics of the Four-Consecutive-Injections Strategy Used in High-Pressure Isobaric Combustion

Optical Study on the Fuel Spray Characteristics of the Four-Consecutive-Injections Strategy Used in High-Pressure Isobaric Combustion

Experimental Study on the Effects of Spray–Wall Interaction on Partially Premixed Combustion and Engine Emissions

Combustion in Diesel Fuelled Partially Premixed Compression Ignition Engines

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