Analysis of Smokeless Spray Combustion in a Heavy-Duty Diesel Engine by Combined Simultaneous Optical Diagnostics

Chartier, Clément; Aronsson, Ulf; Andersson, Öivind; Egnell, Rolf; Collin, Robert; Seyfried, Hans; Richter, Mattias; Aldén, Marcus

doi:10.4271/2009-01-1353

Cited by 30 publications

(14 citation statements)

References 44 publications

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“…OH and CH 2 O form complementing structures, suggesting that locally CH 2 O is consumed rapidly during the second-stage combustion. Chartier et al [13] performed measurements in an optical heavy-duty diesel engine using a reduced number of injector holes (3). Here, the 355 nm LIF is interpreted explicitly as partly-oxidized fuel (POF).…”

Section: Introductionmentioning

confidence: 99%

Relation between hydroxyl and formaldehyde in a direct-injection heavy-duty diesel engine

Donkerbroek¹,

Vliet²,

Somers³

et al. 2011

Combustion and Flame

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Section: Introductionmentioning

confidence: 99%

Relation between hydroxyl and formaldehyde in a direct-injection heavy-duty diesel engine

Donkerbroek¹,

Vliet²,

Somers³

et al. 2011

Combustion and Flame

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“…It is known that the soot behavior of a diesel spray combustion is strongly linked to the local equivalence ratio of the mixture and its temperature. It has been suggested that in engine applications with hydrocarbon fuels, the formation of soot occur when the local equivalent ratio (φ) of the reactants is greater than 2 and their temperature is within the range of 1600-2300 K [34][35][36]. While it is understood that these values are not precise and soot can be observed outside of this range, it is qualitatively justifiable to use this range as a representative region for soot formation.…”

Section: The Role Of Split Injection On the Mixture Formationmentioning

confidence: 99%

The role of a split injection strategy in the mixture formation and combustion of diesel spray: A large-eddy simulation

Hadadpour

Jangi

Pang

2019

Proceedings of the Combustion Institute

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Link to publicationCitation for published version (APA): Hadadpour, A., Jangi, M., Pang, K. M., & Bai, X-S. (2019). The role of a split injection strategy in the mixture formation and combustion of diesel spray: A large-eddy simulation. AbstractThe role of a split injection in the mixture formation and combustion characteristics of a diesel spray in an enginelike condition is investigated. We use large-eddy simulations with finite rate chemistry in order to identify the main controlling mechanism that can potentially improve the mixture quality and reduces the combustion emissions. It is shown that the primary effect of the split injection is the reduction of the mass of the fuel-rich region where soot precursors can form.Furthermore, we investigate the interaction between different injections and explain the effects of the first injection on the mixing and combustion of the second injection. Results show that the penetration of the second injection is faster than that of the first injection. More importantly, it is shown that the ignition delay time of the second injection is much shorter than that of the first injection. This is due to the residual effects of the ignition of the first injection which increases the local temperature and maintains a certain level of combustion some intermediates or radical which in turn boosts the ignition of the second injection.

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“…It is plausible that this is basically caused by thermal coupling between the sprays. 10 It can also be assumed that the reduced ignition delay of the sprays in the upper half of the images is basically caused by the proximity to the relatively hot exhaust valves (recall that the exhaust valves are located there). As shown in Figure 10, the swirl velocity is relatively high for the operating condition with PD in the upper half of the images, that is, for sprays #7, #8, #1, and #2 (the individual sprays are numbered according to Figure 9).…”

Section: Effect Of Swirl Intensity On Diesel Fuel Combustionmentioning

confidence: 99%

“…23,24 It is demonstrated in this article that there is indeed a strong influence of air swirl on combustion and soot formation in the investigated engine for high-swirl operating conditions. It turns out that previously developed conceptual models of diesel combustion 10,11,[25][26][27][28][29] are not exactly applicable to these conditions because they neglect the influence of air swirl.…”

Section: Introductionmentioning

confidence: 99%

Optical investigation of fuel and in-cylinder air-swirl effects in a high-speed direct-injection engine

Hülser

Jakob

Grünefeld

et al. 2014

International Journal of Engine Research

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The primary aim of this study is to investigate current issues of combustion in high-speed direct-injection diesel engines in detail by optical diagnostics. Both fuel and engine design are considered. Recently, measurements of engine-out emissions demonstrated that approximately soot-free combustion can be achieved using a newly designed two-component fuel named BLT. It was composed of 70% butyl levulinate and 30% n-tetradecane (by volume). In this work, the underlying mechanism is clarified by in-cylinder visualization of OH* radicals and soot. In particular, it turns out that in-cylinder soot formation is avoided almost completely, that is, the soot oxidation process is much less important. This is basically achieved by both the oxygen content (about 21%) and the low cetane number (approximately 33) of BLT. The latter leads to enhanced pre-mixing of fuel and air. Consequently, soot formation can be greatly reduced because it depends on the air-fuel ratio of the mixture shortly before high-temperature combustion. The influence of in-cylinder air swirl on combustion and soot formation is also studied for both BLT and conventional diesel fuel, respectively, using the same optical diagnostic. The measurements show that the combustion zone strongly depends on the local gas-flow velocity for diesel fuel. Soot formation decreases with increasing swirl because of enhanced air entrainment and pre-mixing of fuel and air. In addition, the results indicate that soot oxidation is improved under high-swirl conditions for diesel fuel. In contrast, the influence of swirl on the combustion of BLT is overall found to be weak, suggesting that swirl could be reduced in future high-speed direct-injection engines for BLT-like fuels.

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Analysis of Smokeless Spray Combustion in a Heavy-Duty Diesel Engine by Combined Simultaneous Optical Diagnostics

Cited by 30 publications

References 44 publications

Relation between hydroxyl and formaldehyde in a direct-injection heavy-duty diesel engine

Relation between hydroxyl and formaldehyde in a direct-injection heavy-duty diesel engine

The role of a split injection strategy in the mixture formation and combustion of diesel spray: A large-eddy simulation

Optical investigation of fuel and in-cylinder air-swirl effects in a high-speed direct-injection engine

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