Optical and Numerical Investigation of Pre-Injection Reactions and Their Effect on the Starting of a Diesel Engine

Jansons, Marcis; Florea, Radu; Zha, Kan; Estefanous, Fadi; Florea, Elena; Taraza, Dinu; Bryzik, Walter; Henein, Naeim A.; Hoogterp, Laura

doi:10.4271/2009-01-0648

Cited by 7 publications

(4 citation statements)

References 33 publications

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“…Since HCHO is the product of low-temperature oxidation reactions, the authors expected that HCHO would be formed during cranking before firing. This has been confirmed by data published by Wayne State University [28].…”

Section: Simulation Results and Discussionsupporting

confidence: 78%

“…Several factors , such as ambient temperature and pressure [1,[5][6][7][8][9][10]11], the combustion chamber design [11,12,13], the fuel properties [14,15,16], the injection process [1,6,7,17], cranking speed [6,7,11,17], residuals composition, equivalence ratio, surface temperature and the inlet charge temperature [ 14,[18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40], affect the combustion process and engine-out emissions.…”

Section: Factors Affecting Cold Startmentioning

confidence: 99%

“…The authors found that HCHO has an advancing effect on autoignition for iso-octane, but a retarding effect for PRF80 mixture (a mixture of primary reference fuels comprising 80 per cent iso-octane and 20 per cent n-heptane by volume). Jansons et al [28] reported that HCHO has a retarding effect on autoignition under lean conditions in an optically accessible diesel engine.…”

Section: Introductionmentioning

confidence: 99%

“…Jansons [40] reported formaldehyde has a retarding effect on autoignition under lean conditions in an optically accessible diesel engine.…”

Section: Effect Of Adding Formaldehyde On Ignition Delaymentioning

confidence: 99%

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Opposing effects of recirculated gases during cranking on cold start of diesel engines

Rofail

Henein

Bryzik

2011

Proceedings of the Institution of Mechanical Engineers, Part D:

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The effect of recirculating engine-out gases into the intake manifold on the cold start of direct-injection diesel engines is investigated. Two types of recirculation are examined. The first is low-pressure recirculation of engine-out gases into the intake manifold where their rate is controlled by a gas recirculation (GR) valve installed between the exhaust and intake manifold. The second is high-pressure recirculation by restricting the flow of the engine-out gases using a butterfly (BF) valve, installed in the exhaust system after the turbocharger to increase the back pressure and the rate of recirculated gases. Since there is no combustion during cranking, these gases contain evaporated hydrocarbons and partial oxidation products, mostly formaldehyde (HCHO). Experimental investigations on a four-cylinder direct-injection diesel engine indicated that high rates of cranking gas recirculation (CGR) increase the ignition delay and lengthen the cranking period. Since higher concentrations of hydrocarbons (HC) are expected to enhance the autoignition process, it is suspected that the recirculated HCHO would have an opposite effect. These opposing effects are investigated using the ChemKin diesel cycle simulation model. The model results demonstrated the effect of HCHO on slowing the autoignition and combustion reactions.

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Section: Simulation Results and Discussionsupporting

confidence: 78%

Section: Factors Affecting Cold Startmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Jansons [40] reported formaldehyde has a retarding effect on autoignition under lean conditions in an optically accessible diesel engine.…”

Section: Effect Of Adding Formaldehyde On Ignition Delaymentioning

confidence: 99%

See 2 more Smart Citations

Opposing effects of recirculated gases during cranking on cold start of diesel engines

Rofail

Henein

Bryzik

2011

Proceedings of the Institution of Mechanical Engineers, Part D:

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show abstract

A CFD Study of the Effect of HCHO Addition on Autoignition and Combustion

Florea

Zha

Jansons

et al. 2011

ASME 2011 Internal Combustion Engine Division Fall Technical Conference

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Experimental and theoretical research [1] targeted towards the effect of formaldehyde on combustion has identified its OH-scavenging role and recent data suggests it plays an important role in combustion instability observed during engine cold-starting. This effect was further studied using a CFD approach and the kinetic inhibiting effect of formaldehyde on the combustion process has been found to be enhanced by thermal/diffusion effects.

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Effect of Swirl Ratio and Wall Temperature on Pre-lnjection Chemiluminescence During Starting of an Optical Diesel Engine

Jansons

Zha

Florea

et al. 2009

SAE Int. J. Engines

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Optical and Numerical Investigation of Pre-Injection Reactions and Their Effect on the Starting of a Diesel Engine

Cited by 7 publications

References 33 publications

Opposing effects of recirculated gases during cranking on cold start of diesel engines

Opposing effects of recirculated gases during cranking on cold start of diesel engines

A CFD Study of the Effect of HCHO Addition on Autoignition and Combustion

Effect of Swirl Ratio and Wall Temperature on Pre-lnjection Chemiluminescence During Starting of an Optical Diesel Engine

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