Influence of advanced cylinder coatings on vehicular fuel economy and emissions in piston compression ring conjunction

Dolatabadi, Nader; Forder, Michael; Morris, Nicholas J.; Rahmani, Ramin; Rahnejat, Homer; Howell-Smith, S.J.

doi:10.1016/j.apenergy.2019.114129

Cited by 34 publications

(31 citation statements)

References 53 publications

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“…Optimisation of the piston compression ring has a significant potential in reducing emissions. Objectives of reduced energy and subsequent emissions can be partially achieved through use of novel coatings on piston rings and/or cylinder liners as demonstrated in Dolatabadi et al 67 and this can be considered as an extension of the current analysis using the methodology provided in the current study. Some numerical analyses have shown that use of textured features in piston ring-cylinder liner contact can improving the lubrication regime, thus reducing the frictional power losses, particularly during the engine warm-up.…”

Section: Discussionmentioning

confidence: 99%

Energy loss and emissions of engine compression rings with cylinder deactivation

Turnbull

Dolatabadi

Rahmani

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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A novel integrated multi-physics assessment of the piston top compression ring of an internal combustion engine under normal operation mode, as well as subjected to cylinder deactivation is carried out. The methodology comprises ring-liner thermo-mixed hydrodynamics, elastodynamics of ring, as well as combustion gas blow-by and emissions. Therefore, the analysis provides prediction of ring-liner contact’s energy losses and gas power leakage across the piston and ring crevices, as well as the resulting emissions. Cylinder deactivation (CDA) technology reduces the unburnt fuel entering the ring-pack crevices, as well as the emissions. It is also shown that the frictional and gas leakage power losses are exacerbated under CDA by as much as 20%. Although this is much lower than the potential gains in fuel usage when using CDA. The optimisation of the piston compression ring would provide further fuel efficiency and improved emissions, an issue which has not hitherto received the attention which it deserves. The in-depth analysis has also shown that CDA reduces the predicted CO, NOx and HC emissions by nearly as much as 8.5%, 10% and 8.7%, respectively.

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Section: Discussionmentioning

confidence: 99%

Energy loss and emissions of engine compression rings with cylinder deactivation

Turnbull

Dolatabadi

Rahmani

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…Following the reference mapping, the lattice expansion due to temperature rise under steady-state engine operation at a generator load of 2 kW was mapped by measuring for roughly 2 min per location. While certain components in engines, in particular the exhaust valves ( 22 ), any areas impinged upon by fuel sprays ( 5 , 23 , 24 ), and other internal surfaces of the combustion chamber such as the liner and piston rings ( 25 ), are subject to rapid temperature oscillations during the combustion cycle, these generally occur over a time scale on the order of ms, and the penetration of the thermal wave into the engine structure is on the order of hundreds of µm due to the high thermal capacitance of metals. For our measurements taken near the outer surface of the engine structure, the temperature within the gauge volume will be effectively constant provided that the engine is at a constant power output and has reached a steady-state thermal condition.…”

Section: Resultsmentioning

confidence: 99%

Operando measurement of lattice strain in internal combustion engine components by neutron diffraction

Wissink

Chen

Frost

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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Engineering neutron diffraction can nondestructively and noninvasively probe stress, strain, temperature, and phase evolutions deep within bulk materials. In this work, we demonstrate operando lattice strain measurement of internal combustion engine components by neutron diffraction. A modified commercial generator engine was mounted in the VULCAN diffractometer at the Spallation Neutron Source, and the lattice strains in both the cylinder block and head were measured under static nonfiring conditions as well as steady state and cyclic transient operation. The dynamic temporal response of the lattice strain change during transient operation was resolved in two locations by asynchronous stroboscopic neutron diffraction. We demonstrated that operando neutron measurements can allow for understanding of how materials behave throughout operational engineering devices. This study opens a pathway for the industrial and academic communities to better understand the complexities of material behavior during the operation of internal combustion engines and other real-scale devices and systems and to leverage techniques developed here for future investigations of numerous new platforms and alloys.

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“…Para resolver el balance térmico, se toma en cuenta los siguientes cálculos generales. La eficiencia energética del sistema se determina según la Ecuación (9).…”

Section: Q =unclassified

“…La industria automotriz desde el siglo pasado ha venido analizando diseños de motores con el propósito de reducir las emisiones de gases de efecto invernadero -dióxido de carbono (CO 2 ), óxidos de nitrógeno (NO x ), monóxido de carbono (CO)-y material particulado (PM), responsables principales de la degradación del ambiente [7,8]. También los MCI son diseñados para garantizar una potencia de salida específica combinada con la mayor eficiencia posible [9]. Las mejoras también se han incrementado gracias al uso de combustibles con mejores propiedades; uno de los factores importantes que determina la calidad de las gasolinas es el llamado octanaje [10].…”

Section: Introductionunclassified

Evaluación experimental de un motor de encendido provocado bajo diferentes gasolinas

2021

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El motor de combustión interna de encendido provocado es una máquina térmica que permite obtener una potencia mecánica a partir de la energía química de un combustible. El presente trabajo tuvo como objetivo evaluar el desempeño de un motor de combustión interna mediante el balance de energía y exergía, bajo el uso individual de las tres gasolinas comercializadas en el Ecuador (súper, extra y ecopaís). La metodología experimental consistió en la puesta en marcha bajo el uso individual de las gasolinas hasta alcanzar su máxima potencia a una velocidad de giro del motor, donde se tomaron mediciones de temperatura, consumo específico del combustible y la relación aire combustible para un tiempo de tres minutos. Los resultados muestran una eficiencia energética de 11,31 % para gasolina súper, 10,75 % para gasolina extra y 10,39 % para gasolina ecopaís. En lo relacionado a la eficiencia exergética se estableció un 58,81 % para la gasolina súper, 58,89 % para la gasolina extra y un 59,19 % para la gasolina ecopaís. Los resultados permiten concluir que existe un potencial exergético de mejoramiento que puede ser una oportunidad para aumentar la eficiencia energética.

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Influence of advanced cylinder coatings on vehicular fuel economy and emissions in piston compression ring conjunction

Cited by 34 publications

References 53 publications

Energy loss and emissions of engine compression rings with cylinder deactivation

Energy loss and emissions of engine compression rings with cylinder deactivation

Operando measurement of lattice strain in internal combustion engine components by neutron diffraction

Evaluación experimental de un motor de encendido provocado bajo diferentes gasolinas

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