Evaluation of an Air-Gap-Insulated Piston in a Divided-Chamber Diesel Engine

Cole, R. M.; Alkidas, A. C.

doi:10.4271/850359

Cited by 20 publications

(5 citation statements)

References 14 publications

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“…The reduction of thermal stresses posed a particular problem since it is not as easy to achieve compliance in a roll bonded piston as in a bolted design; in the latter the crown can be allowed to move relative to the body by means of spring loaded bolts (9). It was decided, therefore, that the use of a crown material of lower expansion coefficient should be evaluated as a means of reducing thermal stresses.…”

Section: An Air-gap Insulated Piston Continuedmentioning

confidence: 99%

An Air‐gap Insulated Piston

Parker¹,

Donnison²

1987

Industrial Lubrication and Tribology

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The concept of an air‐gap insulated piston has been explored using bolted and welded/roll bonded designs. Pistons with bolted‐on crowns demonstrated the effectiveness of air gap insulation, but roll bonded and welded designs were found to be more robust and to provide the complete sealing of the air gap necessary for continued insulation. Evolution of the design to combine high insulation with adequate durability is discussed. Engine running times of up to 200 hours at full load have been achieved for an air gap piston which reduces heat flow to the crown by 33 per cent. An improved design giving 41 per cent reduction of heat flow has been tested for 78 hours at full engine load with no evident deterioration. Development is continuing to provide a fully durable piston achieving up to 50 per cent reduction in heat flow.

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Section: An Air-gap Insulated Piston Continuedmentioning

confidence: 99%

An Air‐gap Insulated Piston

Parker¹,

Donnison²

1987

Industrial Lubrication and Tribology

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“…High NO x and PM emissions are still the main obstacle in the development of next generation conventional diesel engines. There are many methods like employing improved exhaust gas after-treatment technologies, higher fuel injection pressures (Cole et al, 1985), split and multiple injections (Celikten, 2003), exhaust gas recirculation (EGR), intake air pressure boosting etc. are being applied to reduce particulate matter emissions and NO x levels in the exhaust of the compression ignition engine.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations on Injection Timing Variation at an Injector Opening Pressure of 190bar on Semi- Adiabatic Diesel Engine With Exhaust Gas Recirculation

Sayanna¹,

Krishna²,

Sri³

2020

International Journal of Mechanical Engineering and Technology (Ijmet)

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Particulate emissions and Nitrogen oxides (NOx) levels are exhaust emissions from compression ignition (CI) engine. Once they are in-haled-in, they cause health hazards, besides environmental impact. Hence control of these emissions are important and an urgent task. In the context of depletion of fossil fuels, coupled with exponential growth rate of traction power engines in automobiles and for human luxuries, energy consumption has increased by many folds. This has triggered ever increase of fuel prices in international market and due to uneven distribution of oil resources in the world, a few oil rich countries are getting benefitted and oil lacking countries are suffering from non-affordability. Alcohols and vegetable oils are important substitutes for diesel fuel, as they are renewable. However, drawbacks associated with vegetable oils (high viscosity and low volatility) and alcohols (low cetane number and calorific value of the alcohols) call for low heat rejection (LHR) diesel engine. Exhaust gas recirculation (EGR) is one of the techniques to reduce pollution levels. Investigations were carried out to determine exhaust emissions of particulate matter and oxides of nitrogen with neat diesel operation at different values of Experimental Investigations on Injection Timing Variation at an Injector Opening Pressure of 190bar

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“…These findings were further confirmed throughout the TACOM/Cummins adiabatic engine program (Sudhakar, 1984). (Siegla & Amann, 1984) speculated that the higher heat transfer due to compression of the air into the prechamber in their study would exacerbate the formation of NOx more than in the quiescent, direct-injection combustion chamber used in most heavy duty diesels, which was confirmed by an increase in NO measured with a pre-chamber diesel (Cole & Alkidas, 1985). (Morel, Fort, & Blumberg, 1985) and (Morel, Keribar, Blumberg, & Fort, 1986) predicted small increases in NOx with insulation, despite utilizing a directinjection combustion system.…”

Section: Conventional Insulation In Literaturementioning

confidence: 58%

“…Hydrocarbons, CO, and particulate emissions in the exhaust were all noted to be the same or lower in insulated diesel engines by many authors (Bryzik & Kamo, 1983) (Sudhakar, 1984) (Toyama, Yoshimitsu, Nishiyama, Shimauchi, & Nakagaki, 1983) (Walzer, Heinrich, & Langer, 1985) (Cole & Alkidas, 1985) (Assanis, Wiese, Schwarz, & Bryzik, 1991). The largest contributors to HC and CO emissions are the relatively cool crevice volumes and over-lean areas of the combustion chamber.…”

Section: Conventional Insulation In Literaturementioning

confidence: 95%

“…In addition, the lower volumetric efficiency reduced the maximum load when naturally aspirated, which would necessitate a larger engine to meet the same performance targets and therefore would increase the friction losses at all loads. (Cole & Alkidas, 1985) at General Motors Research experimented with an air-gap insulated piston in a specially designed indirect-injection single cylinder diesel engine with separate instrumentation for the pre-chamber and main chamber, as well as separate cooling paths for the pre-chamber, intake side of the head, exhaust side of the head, and the liner. Heat rejection rates measured at each cooling path showed up to a 17% decrease in heat rejected through the liner accompanied by a slight increase in the heat rejected through the exhaust port, for a total of 7% heat loss reduction with the insulated piston.…”

Section: Conventional Insulation In Literaturementioning

confidence: 99%

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Analytical and Experimental Investigation of Temperature-Swing Insulation on Engine Performance

Andruskiewicz¹

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ResumenLos materiales aislantes han sido investigados a fondo por sus posibles mejoras en la eficiencia térmica de los motores de combustión interna alternativos. Estas mejoras se ven reflejadas tanto directamente en el trabajo indicado como indirectamente a través de la reducción del sistema de refrigeración del propio motor. Diferentes estudios, tanto experimentales como analíticos, han mostrado la reducción en la transferencia de calor a través de las paredes de la cámara de combustión mediante la utilización de estos materiales. Sin embargo, demostrar la conversión de la energía térmica adicional en trabajo indicado ha resultado más difícil. En ciertos estudios se pudieron obtener mejoras en el trabajo indicado durante la carrera de expansión, pero éstas fueron reducidas debido a un menor rendimiento volumétrico debido al calentamiento de la carga durante el proceso de admisión y un mayor trabajo en la carrera de compresión. Típicamente, las únicas mejoras en el trabajo al freno provendrían de la reducción de pérdidas por bombeo en los motores turboalimentados, o de la extracción de la energía adicional de los gases de escape a través de turbinas.El concepto de los materiales con oscilación de la temperatura durante el ciclo motor intenta aprovechar los beneficios del aislamiento durante los procesos de combustión y expansión, mitigando las perdidas por el incremento de la temperatura de las paredes durante la admisión y la compresión. La combinación de baja capacidad calorífica y baja conductividad térmica permitiría que la temperatura de la superficie de la cámara de combustión respondiera rápidamente a la temperatura del gas durante el proceso de combustión. Las temperaturas de la superficie son capaces de aumentar en respuesta al pico de flujo de calor, minimizando así la diferencia de temperatura entre el gas y la pared en la carrera de expansión cuando es posible la mayor conversión de energía térmica en trabajo mecánico. La combinación de baja capacidad calorífica y conductividad térmica es también esencial para permitir este aumento de temperatura durante la combustión y para permitir que la superficie se enfríe durante la expansión y el escape para no perjudicar así el rendimiento volumétrico del motor durante la carrera de admisión y minimizar el trabajo de compresión realizado en el siguiente ciclo.En esta tesis se han desarrollado modelos térmicos y termodinámicos para predecir los efectos de las propiedades de los materiales en las paredes y caracterizar los efectos de la transferencia de calor en diferentes partes del ciclo sobre el trabajo indicado, el rendimiento volumétrico, la energía en los gases de escape y las temperaturas del gas para un motor de combustión interna alternativo. También se ha evaluado el impacto del uso de estos materiales en el knock en motores de combustión de encendido provocado, ya que los estudios experimentales de esta tesis se realizaron en un motor de estas características.Durante la investigación se evaluaron materiales aislantes convencionales para comprender e...

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Evaluation of an Air-Gap-Insulated Piston in a Divided-Chamber Diesel Engine

Cited by 20 publications

References 14 publications

An Air‐gap Insulated Piston

An Air‐gap Insulated Piston

Experimental Investigations on Injection Timing Variation at an Injector Opening Pressure of 190bar on Semi- Adiabatic Diesel Engine With Exhaust Gas Recirculation

Analytical and Experimental Investigation of Temperature-Swing Insulation on Engine Performance

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