The planar imaging of laser induced fluorescence of fuel and hydroxyl for a wall-interacting jet in a single-cylinder, automotive-size, optically accessible diesel engine

Le, Minh Khoi; Kook, Sanghoon; Hawkes, Evatt R.

doi:10.1016/j.fuel.2014.09.089

Cited by 48 publications

(49 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While the soot luminosity signal strength is very different, it is important to note that the dynamics of the wall-interacting jet development characterised by the fuel impingement on the wall soon after the start of injection, its bouncing off to the bowl wall, the penetration back towards the nozzle, and the flow along the wall curvature are very similar between two fuels. The strong circulating signals in the wall-jet head region, indicating the ring vortices formed during the jet-wall interaction [21,26,29], are also evident for both fuels. Therefore, the hot soot luminosity images in Fig.…”

Section: Natural Combustion Luminositymentioning

confidence: 79%

“…It is also noteworthy that the piston top quartz window provided the field-of-view that covers the entire bowl.The removal of a 35-mm-wide portion of the bowl rim was to insert the laser sheet into the bowl region even when the piston was near the top dead centre. However, our full-cycle modelling study proved that this cut-out does not affect the incylinder swirl flow [28] and more importantly, our previous study [29] showed that the flame development is not impacted as the target jet penetrates towards the opposite side of the bowl rim and the main combustion event completes before the flames reach the cut-out region. Considering these piston design modifications, the geometric compression ratio is estimated at 15.5.…”

Section: Engine Setup and Operating Conditionsmentioning

confidence: 98%

“…It is well known that OH fluorescence absorption and emission change drastically with a very small difference in the excitation wavelength [40,44]. By comparing images taken under the wavelength tuned on and off the OH excitation fluorescence line, the location and intensity of the interferences can be identified [29,42,45], which help interpret the online OH-PLIF images for the high-temperature reaction zones within the diesel flame. The offline images of the present study were taken with the laser wavelength at 283.9 nm (i.e.…”

Section: Planar Laser-induced Fluorescence Of Oh (Oh-plif)mentioning

confidence: 98%

“…radicals have returned to their ground state and only the ground-state OH is produced [36,40,41]. During this period, planar laser-induced fluorescence of hydroxyl (OH-PLIF) imaging is widely used to study the diesel flame development [11,29,41,42]. The OH-PLIF detects the fluorescence signals emitted when OH radials excited by a high energy laser beam return to their ground state [43].…”

Section: Planar Laser-induced Fluorescence Of Oh (Oh-plif)mentioning

confidence: 99%

See 3 more Smart Citations

The development of hydroxyl and soot in a methyl decanoate-fuelled automotive-size optical diesel engine

Zhang

Rao

et al. 2016

Fuel

Self Cite

View full text Add to dashboard Cite

This study presents planar images of laser-induced fluorescence of fuel (fuel-PLIF) and hydroxyl (OH-PLIF) as well 1 as incandescence of soot (soot-PLII) obtained in a small-bore optical diesel engine fuelled with methyl decanoate. The 2 focus is on how jet-wall interaction impacts the temporal and spatial development of a reacting fuel jet, high-3 temperature reaction, and soot within the flame. A single-hole nozzle was used to isolate the jet-wall interaction from 4 jet-jet interactions and to apply long injection duration corresponding to high-load engine operating conditions in which soot formation is particularly problematic. Methyl decanoate was selected as a surrogate fuel due to its lowsooting propensity and thus reduced laser attenuation, as well as the interests in oxygenated fuels, and the existence of 7 detailed reaction kinetics in the literature. Laser-based images show that the fuel impinges on the bowl wall soon after the start of injection and then bounces off along the wall forming a wall-interacting jet. The fuel jet continues to travel along the bowl wall as well as the bottom surface of the piston bowl. During the premixed burn phase of diesel combustion, the high-temperature reaction starts to occur at the leading edge of the penetrating jet back towards the nozzle, initially near the jet axis and then spreads in the radial direction. During the mixing-controlled burn phase, the high-temperature reaction zone fills up the entire combustion chamber and the soot formation starts to occur in the rich area near the wall impingement point. The soot then flows along the bowl wall in both up-swirl and down-swirl directions. These soot pockets are surrounded by OH and they soon disappear altogether at subsequent crank angle locations, suggesting the soot oxidation by OH radicals. However, some soot pockets are transported into the centre of bowl due to the downward movement of the piston and persist for long as there are no active OH radicals.

show abstract

Section: Natural Combustion Luminositymentioning

confidence: 79%

Section: Engine Setup and Operating Conditionsmentioning

confidence: 98%

Section: Planar Laser-induced Fluorescence Of Oh (Oh-plif)mentioning

confidence: 98%

Section: Planar Laser-induced Fluorescence Of Oh (Oh-plif)mentioning

confidence: 99%

See 2 more Smart Citations

The development of hydroxyl and soot in a methyl decanoate-fuelled automotive-size optical diesel engine

Zhang

Rao

et al. 2016

Fuel

Self Cite

View full text Add to dashboard Cite

show abstract

“…Researchers were very interested in characteristics of soot in FWI and [104][105][106][107][108][109][110][111][112] the relevant strategies to reduce soot formation in engines. The analysis of these studies were shown in Table 3.…”

Section: Soot Characteristics In Fwi Of Internal Combustion Enginesmentioning

confidence: 99%

Pollutants Emissions of CO and Soot from Flame-wall Interactions in Fundamental and Practical Energy Conversion Systems: A Review

Luo¹,

Liu²

2018

ES Energy Environ.

View full text Add to dashboard Cite

Flame-wall interactions (FWI) as one kind of fundamental combustion phenomenon is universally found in various laboratory and practical combustion devices. It not only affects the combustion and energy conversion efficiency but also induces severe pollutants emissions. This review summarizes the pollutants emission characteristics in FWI from CO and soot aspects. The investigations of CO formation from FWI in various fundamental and practical energy conversion systems with different fuel types, operating conditions, sampling and analyzing methods and etc. are separately discussed. Meanwhile, multiple advanced laser diagnostics techniques are also adopted in different laboratory impinging flames to acquire more accurate and precise measurements of CO distributions in FWI. To gain more knowledge of pollutants emissions in FWI, the behaviors of soot from practical internal engines are observed with the aid of visualization techniques. Studies that utilize different combustion system configurations to modulate soot formation in FWI of practical engines are conducted as well. Recent literature subsequently evaluates the variations of soot morphology and nanostructure in FWI. The characteristics of soot particle size distribution function (PSDF) from FWI are briefly studied via burner-stabilized stagnation (BBS) flames at laboratory scale. The review ends with the unresolved issues for the future research.

show abstract

Experimental study on the interactions of wall temperature and impingement distances and their effects on the impinged diesel spray ignition and combustion characteristics

Yang

Cheng

et al. 2023

Applied Thermal Engineering

View full text Add to dashboard Cite

The planar imaging of laser induced fluorescence of fuel and hydroxyl for a wall-interacting jet in a single-cylinder, automotive-size, optically accessible diesel engine

Cited by 48 publications

References 48 publications

The development of hydroxyl and soot in a methyl decanoate-fuelled automotive-size optical diesel engine

The development of hydroxyl and soot in a methyl decanoate-fuelled automotive-size optical diesel engine

Pollutants Emissions of CO and Soot from Flame-wall Interactions in Fundamental and Practical Energy Conversion Systems: A Review

Experimental study on the interactions of wall temperature and impingement distances and their effects on the impinged diesel spray ignition and combustion characteristics

Contact Info

Product

Resources

About