Diesel Cold Starting: Actual Cycle Analysis Under Border-Line Conditions

Zahdeh, Akram; Henein, Naeim A.; Bryzik, Walter

doi:10.4271/900441

Cited by 45 publications

(24 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Studies performed on climatic chambers ( [3,8,9,10]) have certainly delivered valu-able information but several measurement uncertainties and the incapability of using extra diagnostic tools have prevented from making a detailed explanation of this combustion process. Laget et al [6] show a more systematic approach to the problem in which in-cylinder analysis, endoscopic visualization and CFD modeling are coupled in order to identify the pre-glowing glow plug duration, nozzle tip protrusion, injector spray angle and cranking speed as key parameters with influence on startability.…”

Section: Introductionmentioning

confidence: 99%

Ignition and combustion development for high speed direct injection diesel engines under low temperature cold start conditions

Pastor

García-Oliver

Ramírez-Hernández

2011

Fuel

View full text Add to dashboard Cite

Visualization results show that pilot ignition occurs in the vicinity of the glow plug, and strongly influences main combustion initiation. Main combustion starts from the pilot flame, and propagates to the rest of the combustion chamber showing a strong visible reaction zone. After end of main injection, the rapid leaning of the mixture suppresses the strong radiation, and OH radiation is observed to progress to the rest of the combustion chamber. The combustion process shows a strong scattering, which has been quantified

show abstract

Section: Introductionmentioning

confidence: 99%

Ignition and combustion development for high speed direct injection diesel engines under low temperature cold start conditions

Pastor

García-Oliver

Ramírez-Hernández

2011

Fuel

View full text Add to dashboard Cite

show abstract

“…It is obvious that the lower the ambient temperature, the less the chance the engine has to start. Zahdeh, Henein and Bryzik [41] verified this behavior in a single-cylinder direct injection (DI) engine, which had a compression ratio of 17 and a total piston displacement of 673 cm 3 . The testing was done at an ambient temperature of 263 K and the engine was observed to operate on an 8-stroke-cycle (where combustion failed every second cycle) and on a 12-stroke-cycle (where combustion failed in two consecutive cycles after a firing cycle).…”

Section: Ambient Temperaturementioning

confidence: 82%

“…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%

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:

View full text Add to dashboard Cite

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.

show abstract

“…According to [18,19], diesel engine startability is affected by many in-cylinder interacting physical and chemical processes, which lead to auto-ignition and, thus, to combustion. Physical processes include fuel injection, atomization, vaporization and, in the end, mixing of the fuel vapor with air.…”

Section: Cold Startingmentioning

confidence: 99%

“…Many researchers have studied the cold starting of the petroleum diesel-fueled compression ignition engine [17][18][19][20]. To the authors' knowledge, however, there are only a few studies focusing on the assessment of the impact of biodiesel blends on the compression ignition engine cold startability.…”

Section: Cold Startingmentioning

confidence: 99%

Impact of Biodiesel Blends and Di-Ethyl-Ether on the Cold Starting Performance of a Compression Ignition Engine

et al. 2016

View full text Add to dashboard Cite

Abstract:The use of biodiesel fuel in compression ignition engines has the potential to reduce CO 2 , which can lead to a reduction in global warming and environmental hazards. Biodiesel is an attractive fuel, as it is made from renewable resources. Many studies have been conducted to assess the impact of biodiesel use on engine performances. Most of them were carried out in positive temperature conditions. A major drawback associated with the use of biodiesel, however, is its poor cold flow properties, which have a direct influence on the cold starting performance of the engine. Since diesel engine behavior at negative temperatures is an important quality criterion of the engine's operation, one goal of this paper is to assess the starting performance at´20˝C of a common automotive compression ignition engine, fueled with different blends of fossil diesel fuel and biodiesel. Results showed that increasing the biodiesel blend ratio generated a great deterioration in engine startability. Another goal of this study was to determine the biodiesel blend ratio limit at which the engine would not start at´20˝C and, subsequently, to investigate the impact of Di-Ethyl-Ether (DEE) injection into the intake duct on the engine's startability, which was found to be recovered.

show abstract

Diesel Cold Starting: Actual Cycle Analysis Under Border-Line Conditions

Cited by 45 publications

References 4 publications

Ignition and combustion development for high speed direct injection diesel engines under low temperature cold start conditions

Ignition and combustion development for high speed direct injection diesel engines under low temperature cold start conditions

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

Impact of Biodiesel Blends and Di-Ethyl-Ether on the Cold Starting Performance of a Compression Ignition Engine

Contact Info

Product

Resources

About