The Development of An Air Gap Insulated Piston

Parker, David; Donnison, G.M.

doi:10.4271/870652

Cited by 22 publications

(12 citation statements)

References 4 publications

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“…As the vegetable oils mentioned above need a hot combustion chamber to achieve ecient energy release rates, the concept of the low heat rejection diesel engine has been implemented in the present investigation. The low heat rejection diesel engine consists of a two-part pistonÐthe top crown, made of low thermal conductivity material Superni-90, is screwed on to the aluminium body of the piston, providing a 3 mm air gap inbetween the crown and the body of the piston [7]. A Superni-90 insert is screwed on to the top portion of the liner in such a manner that an air gap of 3 mm is maintained between the insert and liner body.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of non-edible vegetable oils as substitute fuels in low heat rejection diesel engines

Prasad¹,

Krishna

Reddy

et al. 2000

Proceedings of the Institution of Mechanical Engineers, Part D:

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Search for renewable fuels such as vegetable oils, in particular non-edible vegetable oils, has become more pertinent in the context of the fossil fuel crisis and vehicle population explosion. The drawbacks associated with vegetable oils for use in diesel engines call for a hot combustion chamber. The concept of the low heat rejection diesel engine is gaining prominence for adopting vegetable oils as substitute fuels for conventional diesel fuel. Non-edible vegetable oils such as Pongamia oil and Jatropha curcas oil are found to be efective substitute fuels in the low heat rejection diesel engine. EsteriRcation, preheating and increase in injection pressures have been tried for efective utilization of the vegetable oils. Performance parameters such as the brake specific energy consumption (b.s.e.c.) and exhaust gas temperature (EGT) have been reported for varying magnitudes of brake mean efective pressure (b.m.e.p.) with diferent non-edible vegetable oils as substitute fuels. The pollution levels of black smoke and NOx have been recorded. Combustion diagnosis is also carried out with the aid of a miniature piezoelectric pressure transducer and TDC (top dead centre) encoder.

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Section: Introductionmentioning

confidence: 99%

Performance evaluation of non-edible vegetable oils as substitute fuels in low heat rejection diesel engines

Prasad¹,

Krishna

Reddy

et al. 2000

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…A nozzle is used to generate fine spray of urea solution into exhaust gas before it enters into catalytic chamber containing lanthanum exchanged zeolite. LHR engine [16,17] consists of an air gap insulated piston with superni crown and air gap insulated liner with superni insert as shown in Fig.2.…”

Section: Experimental Programmementioning

confidence: 99%

Control of Nitrogen Oxides in Diesel Engine Exhaust by Catalytic Reduction

Murthy¹,

Krishna²

2012

IOSRJEN

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The nitrogen oxides (NOx) are prominent and harmful pollutants in the exhaust of diesel engines. The reduction of NOx to harmless products using catalysts is proved to be a remedy. The present study attempts to reduce NOx emissions in the exhaust of low heat rejection (LHR) diesel engine by catalytic reduction, using lanthanum ion exchanged zeolite (catalyst-A) and urea infused lanthanum ion exchanged zeolite (catalyst-B) under varied conditions . The effect of temperature of catalyst, space velocity, and void ratio on the reduction of NOx in the exhaust of the engines are also studied and compared with the conventional engine (CE) under identical conditions. The study showed a considerable reduction by 40-50% in NOx emissions.

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“…In addition, they do not depend upon the fuel quality and cetane number [5,6] and produce lower exhaust emissions [7] than DI diesel engines. Some of the major advantages of LHR engines in- clude better fuel economy, increased engine life, reduction in HC, CO and particulate matter (PM) emissions, and lower combustion noise due to reduced pressure increasing rate, increased exhaust gases exergy, and ability operating lower cetane fuels [11][12][13][14][15][16][17]. Beside thermal efficiency decreases in IDI engine in comparison to DI engine because of higher heat loss from cylinder wall.…”

Section: Introductionmentioning

confidence: 99%

Three dimensional modeling of combustion process and emission formation in a low heat rejection indirect injection diesel engine

Jafarmadar

2014

THERM SCI

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Higher heat losses and brake specific fuel consumption are major problems in an indirect injection diesel engine, which can be overcome by means of low heat rejection concept. This concept is based on the approach of insulating of piston and liner of main chamber in an indirect injection engine. At the present work, the combustion process and emission formation in baseline and low heat rejection engines are studied by a computational fluid dynamics code at four different loads (25%, 50%, 75%, and 100%) in maximum torque engine speed of 730 rpm. The numerical results for the pressure in cylinder and emissions for baseline engine at full load operation are compared to the corresponding experimental data and show good agreement. The comparison of the results for two cases show that when the load increases from 25% to 100% in 25% steps, heat loss in low heat rejection engine decrease 40. 3%, 44.7%, 44.6%, and 45.2%, respectively. At full load operation in low heat rejection engine, NO x and soot emissions decrease 13.5% and 54.4%, respectively, and engine efficiency increases 6.3% in comparison to baseline engine.

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The Development of An Air Gap Insulated Piston

Cited by 22 publications

References 4 publications

Performance evaluation of non-edible vegetable oils as substitute fuels in low heat rejection diesel engines

Performance evaluation of non-edible vegetable oils as substitute fuels in low heat rejection diesel engines

Control of Nitrogen Oxides in Diesel Engine Exhaust by Catalytic Reduction

Three dimensional modeling of combustion process and emission formation in a low heat rejection indirect injection diesel engine

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