Investigating the Effects of Multiple Pilot Injections on Stability at Cold Idle for a Dl Diesel Engine

MacMillan, David; Rocca, A. La; Shayler, P. J.; Morris, Tim; Murphy, Michael C.; Pegg, Ian

doi:10.4271/2009-01-0612

Cited by 24 publications

(15 citation statements)

References 14 publications

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“…The result of this is reduced ignition delay and higher initial peak rate of heat release. Previous work conducted by the authors [20] has confirmed this benefit at cold conditions during engine cranking and the run up to idle. It has revealed that a better and more repeatable combustion when the number of pilot injections was increased from one to three.…”

Section: Resultsmentioning

confidence: 52%

“…To examine why extra pilot injections have a positive impact on heat release characteristics in-cylinder fuel distribution has been investigated using Kiva3v. A thorough optimization of number of pilots, quantities and timings was previously carried out by the authors and selected results were also published in [20]. For this study, the number of injections was varied from 1-4, but total fuel quantity kept constant at 17 mm3/str.…”

Section: Resultsmentioning

confidence: 99%

“…Any sectors which do not ignite with the initial phase of heat release can be expected to burn as combustion spreads across the chamber. Multiple pilot injections at cold idle results in better stability of work output [20].…”

Section: Figures 4 and 5 Provide Detailed Fuel Distribution Informatimentioning

confidence: 99%

See 2 more Smart Citations

CFD Investigation on the Influence of In-Cylinder Mixture Distribution from Multiple Pilot Injections on Cold Idle Behaviour of a Light Duty Diesel Engine

Rocca

MacMillan

Shayler

et al. 2014

SAE Technical Paper Series

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Cold idle operation of a modern design light duty diesel engine and the effect of multiple pilot injections on stability were investigated. The investigation was initially carried out experimentally at 1000rpm and at −20°C. Benefits of mixture preparation were initially explored by a heat release analysis. Kiva 3v was then used to model the effect of multiple pilots on in-cylinder mixture distribution. A 60° sector of mesh was used taking advantage of rotational symmetry. The combustion system and injector arrangements mimic the HPCR diesel engine used in the experimental investigation. The CFD analysis covers evolutions from intake valve closing to start of combustion. The number of injections was varied from 1 to 4, but the total fuel injected was kept constant at 17mm 3 /stroke. Start of main injection timing was fixed at 7.5°BTDC. The experimental study shows that increasing the number of pilots improves stability and leads to fuel preparation resulting in higher initial peak rate of heat release. CFD results show that multiple pilot injections are capable of better fuel distribution; noticeable by injecting just one pilot compared to no pilot. A further pilot increases the surface area of the vapour cloud to a greater extent. Three pilots allow for fuel to be well distributed in the full bowl with no lean regions; a greater proportion of the fuel is exposed to the glow plug temperature. The glow plug is enclosed by a fuel cloud over a longer period of time as the number of pilot injections is increased.

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Section: Resultsmentioning

confidence: 52%

Section: Resultsmentioning

confidence: 99%

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CFD Investigation on the Influence of In-Cylinder Mixture Distribution from Multiple Pilot Injections on Cold Idle Behaviour of a Light Duty Diesel Engine

Rocca

MacMillan

Shayler

et al. 2014

SAE Technical Paper Series

View full text Add to dashboard Cite

show abstract

“…The research on low idle performance was conducted by Khan et al (2006), Pekula et al (2003). Toback et al (2004), MacMillan et al (2009), Ghaffarpour et al (1995, 2006, and Ghaffarpour and Noorpoor (2007).…”

Section: Engine Emissions Behavior and Steady-state Calibration Optimmentioning

confidence: 99%

Combustion, emissions, and calibration for diesel engine system design

Xin¹

2013

Diesel Engine System Design

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“…The timing of these injections and the fraction of the fuel delivered by each injection strongly affects the combustion process. Injecting fuel prior to the main injection (termed a pilot injection) adds energy and turbulence to the combustion mixture thereby reducing the ignition delay of the main injection, especially at low temperatures (MacMillan et al, 2009;Osuka et al, 1994). This allows for the majority of the heat release to occur when the piston is close to top-dead-center which results in a higher thermodynamic efficiency.…”

Section: Introductionmentioning

confidence: 99%

Improved Combustion Control in Diesel Engines Through Active Oxygen Concentration Compensation

Meyer¹,

Yurkovich²

2012

Stoichiometry and Materials Science - When Numbers Matter

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Investigating the Effects of Multiple Pilot Injections on Stability at Cold Idle for a Dl Diesel Engine

Cited by 24 publications

References 14 publications

CFD Investigation on the Influence of In-Cylinder Mixture Distribution from Multiple Pilot Injections on Cold Idle Behaviour of a Light Duty Diesel Engine

CFD Investigation on the Influence of In-Cylinder Mixture Distribution from Multiple Pilot Injections on Cold Idle Behaviour of a Light Duty Diesel Engine

Combustion, emissions, and calibration for diesel engine system design

Improved Combustion Control in Diesel Engines Through Active Oxygen Concentration Compensation

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