A study of suspension plasma-sprayed insulated pistons evaluated in a heavy-duty diesel engine

Thibblin, Anders; Olofsson, Ulf

doi:10.1177/1468087419879530

Cited by 11 publications

(16 citation statements)

References 32 publications

(55 reference statements)

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“…The SiRPA coating was reported to give small improvements in thermal efficiency (< 2 %) and exhaust gas temperatures while reducing the energy transferred to the coolant. Similar coatings have been tested by various researchers, where similar improvements, albeit small, were observed [7,8,[10][11][12] with some researchers however, reporting a deterioration in fuel consumption when these coating where employed [13].…”

Section: Introductionsupporting

confidence: 66%

“…It has been shown that the surface roughness [8] and the permeable porosity [10,13] can have an adverse effect on the expected gains in efficiency. An increase in surface roughness has the potential to increase heat transfer losses due to a higher surface area [22].…”

Section: Discussionmentioning

confidence: 99%

“…Published research is showing mixed results in terms of the effect of permeable porosity on efficiency. The porosity of the ceramic coatings has been shown to lead to increased heat transfer losses (increased surface area) as well as result in fuel absorption in the pores, thus resulting in longer combustion duration and reduced efficiency [13,15]. Another way of impacting efficiency is the reduction in compression ratio due to the porosity of the coating.…”

Section: Discussionmentioning

confidence: 99%

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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: Introductionsupporting

confidence: 66%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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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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“…Since then, several other studies have been conducted to determine the impact of insulating the combustion chamber walls of an ICE. 20,21 Developing new coating materials for ICEs is quite challenging as they have to combine optimal insulating properties with resistance and adherence properties to endure the engine operating conditions. Advanced test benches and numerical simulations are needed in order to determine the effectiveness of the coatings.…”

Section: Introductionmentioning

confidence: 99%

“…Since then, several other studies have been conducted to determine the impact of insulating the combustion chamber walls of an ICE. 20,21…”

Section: Introductionmentioning

confidence: 99%

Conjugate heat transfer study of the impact of ‘thermo-swing’ coatings on internal combustion engines heat losses

Broatch

Olmeda

Margot

et al. 2020

International Journal of Engine Research

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To comply with the very strict emissions regulation the automotive industry is succeeding in developing ever more efficient engines, and there is scope for more improvements. In this regard, some investigations have suggested that insulating the combustion chamber walls of an internal combustion engine (ICE) yield low thermal losses. Most of the literature available on this topic presents simplified models that do not allow studying in detail the coating impact on engine efficiency. A more precise approach that consists in the combination of Computational Fluid Dynamics (CFD) and Conjugate Heat Transfer (CHT) simulations is used in this paper to predict the heat losses through the combustion chamber walls of a spark ignition (SI) engine. Two configurations are considered for the single cylinder engine: the metallic case and the same engine with coated piston and cylinder head. The insulation material has a low thermal conductivity ( k[Formula: see text]1.0 W/( mK)). The numerical results are validated by comparison with the results of a 1D heat transfer model and with experimental data for a medium load operation point (3000 rpm −7 bar IMEP). The solutions obtained are analysed in detail in terms of wall temperature distribution and heat transfer. The impact of the coating on the engine efficiency is thus assessed. The CFD-CHT calculations yields very good results in terms of heat transfer prediction during the whole engine cycle.

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Influence of the Fuel Injection Advance Angle on the Technical and Environmental Performance of a Diesel Engine (21/21) with a Turbocharger

Шестаков

Plotnikov

2022

Lecture Notes in Mechanical Engineering

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A study of suspension plasma-sprayed insulated pistons evaluated in a heavy-duty diesel engine

Cited by 11 publications

References 32 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

Conjugate heat transfer study of the impact of ‘thermo-swing’ coatings on internal combustion engines heat losses

Influence of the Fuel Injection Advance Angle on the Technical and Environmental Performance of a Diesel Engine (21/21) with a Turbocharger

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