The effect of a stepped lip piston design on performance and emissions from a high-speed diesel engine

Leach, Felix; Ismail, Riyaz; Davy, Martin; Weall, Adam; Cooper, Brian

doi:10.1016/j.apenergy.2018.02.076

Cited by 37 publications

(26 citation statements)

References 28 publications

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“…An increase in surface roughness has the potential to increase heat transfer losses due to a higher surface area [22]. At the same time increased surface roughness can affect the fuel/air mixing as it inhibits spray penetration at the centre of bowl thus leading to a poorer fuel/air mixing [19,23]. Consequently this can result in longer burn duration and increased smoke emissions due to locally higher equivalence ratios.…”

Section: Discussionmentioning

confidence: 99%

The Effect of an Active Thermal Coating on Efficiency and Emissions from a High Speed Direct Injection Diesel Engine

Papaioannou¹,

Leach²,

Davy³

et al. 2020

SAE Technical Paper Series

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This study looked into the application of active thermal coatings on the surfaces of the combustion chamber as a method of improving the thermal efficiency of internal combustion engines. The active thermal coating was applied to a production aluminium piston and its performance was compared against a reference aluminium piston on a single-cylinder diesel engine. The two pistons were tested over a wide range of speed/load conditions and the effects of EGR and combustion phasing on engine performance and tailpipe emissions were also investigated. A detailed energy balance approach was employed to study the thermal behaviour of the active thermal coating. In general, improvements in indicated specific fuel consumption were not statistically significant for the coated piston over the whole test matrix. Mean exhaust temperature showed a marginal increase with the coated piston of up to 6 °C. However, the normalised exhaust enthalpy showed a reduction (apart from the higher speed/load conditions when no EGR was applied). Energy transfer to the coolant was reduced by as much as 1.5 percentage points, in agreement with the expected reduction in piston heat transfer, across all operating conditions. Finally, soot emissions were increased with the coated piston, with the biggest differences between the coated and non-coated pistons observed at the lower speed/load conditions.

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Section: Discussionmentioning

confidence: 99%

The Effect of an Active Thermal Coating on Efficiency and Emissions from a High Speed Direct Injection Diesel Engine

Papaioannou¹,

Leach²,

Davy³

et al. 2020

SAE Technical Paper Series

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“…Modelling NO 2 levels as part of total NO x in computational fluid dynamics (CFD) usually results in high levels of simulation tuning -often using fixed NO:NO 2 ratios obtained from experiments. 13,14 The effect that a number of diesel engine parameters has on the NO 2 /NO x ratio has been investigated in comprehensive work by Ro¨ßler et al 15 conducted on a single-cylinder engine representative of a Euro VI commercial vehicle engine. In general, they found that parameters which decrease NO x emissions lead to increases in NO 2 /NO x ratio.…”

Section: Introductionmentioning

confidence: 99%

Cyclic NO₂:NO_x ratio from a diesel engine undergoing transient load steps

Leach

Davy

Peckham

2019

International Journal of Engine Research

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As the control of real driving emissions continues to increase in importance, the importance of understanding emission formation mechanisms during engine transients similarly increases. Knowledge of the NO2/NOx ratio emitted from a diesel engine is necessary, particularly for ensuring optimum performance of NOx aftertreatment systems. In this work, cycle-to-cycle NO and NOx emissions have been measured using a Cambustion CLD500, and the cyclic NO2/NOx ratio calculated as a high-speed light-duty diesel engine undergoes transient steps in load, while all other engine parameters are held constant across a wide range of operating conditions with and without exhaust gas recirculation. The results show that changes in NO and NOx, and hence NO2/NOx ratio, are instantaneous upon a step change in engine load. NO2/NOx ratios have been observed in line with previously reported results, although at the lightest engine loads and at high levels of exhaust gas recirculation, higher levels of NO2 than have been previously reported in the literature are observed.

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“…4 In addition to these parameters, combustion chamber geometry and the details of the fuel-air mixing also have an essential effect. 5,6 Given the complex nature of NO x formation in diesel engines, developing a predictive model to understand the relative importance of all of these parameters is of significant interest.…”

Section: Introductionmentioning

confidence: 99%

On the application of artificial neural networks for the prediction of NO_x emissions from a high-speed direct injection diesel engine

Fang

Papaioannou

Leach

et al. 2020

International Journal of Engine Research

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This article considers the application and refinement of artificial neural network methods for the prediction of NO x emissions from a high-speed direct injection diesel engine over a wide range of engine operating conditions. The relative computational cost and performance of two backpropagation algorithms, Levenberg–Marquardt and Bayesian regularization, for this application are compared, with the Levenberg–Marquardt algorithm demonstrating a significant cost advantage. This work also assesses the performance of two alternative filtering approaches, a p-value test and the Pearson correlation coefficient, for reducing the required number of input variables to the model. The p-value test identified 32 input parameters of significance, whereas the Pearson correlation test highlighted 14 significant parameters while additionally providing a ranking of their relative importance. Finally, the article compares the predictive performance of the models generated by the two filtering methods. Overall, both models show good agreement to the experimental data with the model created using the Pearson correlation test showing improved performance in the low-NO x region.

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The effect of a stepped lip piston design on performance and emissions from a high-speed diesel engine

Cited by 37 publications

References 28 publications

The Effect of an Active Thermal Coating on Efficiency and Emissions from a High Speed Direct Injection Diesel Engine

The Effect of an Active Thermal Coating on Efficiency and Emissions from a High Speed Direct Injection Diesel Engine

Cyclic NO₂:NO_x ratio from a diesel engine undergoing transient load steps

On the application of artificial neural networks for the prediction of NO_x emissions from a high-speed direct injection diesel engine

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The effect of a stepped lip piston design on performance and emissions from a high-speed diesel engine

Cited by 37 publications

References 28 publications

The Effect of an Active Thermal Coating on Efficiency and Emissions from a High Speed Direct Injection Diesel Engine

The Effect of an Active Thermal Coating on Efficiency and Emissions from a High Speed Direct Injection Diesel Engine

Cyclic NO2:NOx ratio from a diesel engine undergoing transient load steps

On the application of artificial neural networks for the prediction of NOx emissions from a high-speed direct injection diesel engine

Contact Info

Product

Resources

About

Cyclic NO₂:NO_x ratio from a diesel engine undergoing transient load steps

On the application of artificial neural networks for the prediction of NO_x emissions from a high-speed direct injection diesel engine