Selective Heat Insulation of Combustion Chamber Walls for a DI Diesel Engine with Monolithic Ceramics

Miyairi, Y.; Matsuhisa, T.; Ozawa, Tadao; Oikawa, Hiroshi; Nakashima, Naohisa

doi:10.4271/890141

Cited by 33 publications

(14 citation statements)

References 8 publications

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“…The volumetric efficiency should drop, as the hotter walls and residual gas decrease the density of the inducted air. As expected all the investigations [D.Assanis et al [28], J.A.Gatowski [25], R.H.Thring [26], Miyairi et al [20], Suzuki et al [27] and others] on LHR engine show decreased volumetric efficiency. The deterioration in volumetric efficiency of the LHR engine can be preventedby turbocharging, and that there can be more effective utilization of the exhaust gas energy.…”

Section: Volumetric Efficiencysupporting

confidence: 80%

“…Experimental Investigation of Y.Miyairi et al [20] using single cylinder DI diesel engine indicates improved engine performance, reduced HC emissions but increased Nitric Oxide emission and decreased volumetric efficiency. They also report reduction in BSFC by 7% under naturally aspirated conditions.…”

Section: Experimental Studies On Lhr Diesel Enginementioning

confidence: 98%

“…The specific fuel consumption varies from 2 to 17 %. This variation is mainly due to different amount of reductions in-cylinder heat rejections effected by degrees of insulations and different quantities of energy recovered from the exhaust.Y.Miyairi's [20] Low Heat Rejection diesel cycle simulation consists of a gas flow model, a heat transfer model and a two-zone combustion model. The heat transfer model is used to determine convective and radiative heat transfer between the gas and the cylinder valve.…”

Section: Simulation Studiesmentioning

confidence: 99%

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Application of Thermal Barrier Coatings in Diesel Engines: a Review

Domakonda¹,

Puli²

2012

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A review of research on low heat rejection engines, to incorporate various systems of ceramic materials in intermittent combustion engines, and on the use of ceramics in these engines is presented. The reduction of heat loss from the combustion chamber of diesel engines improves fuel efficiency only by 3 or 4 per cent. Some other gains may be possible from a smaller cooling system, recovery of exhaust energy, and improvements in aerodynamics. The use of thermal barrier coatings (TBCs) to increase the combustion temperature in diesel engines has been pursued for over 20 years. Increased combustion temperature can increase the efficiency of the engine, decrease the CO and (possibly) the NOx emission rate. However, TBCs have not yet met with wide success in diesel engine applications because of various problems associated with the thermomechanical properties of the coating materials. Although, the in-cylinder temperatures that can be achieved by the application of ceramic coatings can be as high as 850-9000C compared to current temperatures of 650-7000C. The increase in the in-cylinder temperatures helped in better release of energy in the case of biodiesel fuels thereby reducing emissions at, almost the same performance as the diesel fuel. The purpose of this paper is to explain the effect of insulation on engine performance, heat transfer characteristics, combustion and emission characteristics. Many researchers have carried out a large number of studieson Low Heat Rejection Engine (LHRE) concept. Some of them are experimental work and many are theoretical studies. In the case of LHR engines almost all theoretical studies predict improved performance but many experimental studies show different picture. This paper analyses the reason for this deviation. The operating conditions, under which the experimental and simulation studies are carried out, have been clearly discussed. The factors, which affect thermal efficiency, combustion, and exhaust emissions in LHR engine, are deduced and their influences discussed.

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Section: Volumetric Efficiencysupporting

confidence: 80%

Section: Experimental Studies On Lhr Diesel Enginementioning

confidence: 98%

Section: Simulation Studiesmentioning

confidence: 99%

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Application of Thermal Barrier Coatings in Diesel Engines: a Review

Domakonda¹,

Puli²

2012

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“…Torch to base distance (mm) 100 Powder feed rate (g/min) 10 Powder carrier gas (Argon) flow rate (l min -1 ) 6 [16] proved that reduction in BSFC by 7% under naturally aspirated conditions. Hanbey hazar [7] resulted in decrease in SFC by 4.9-5.3%.…”

Section: Operating Parameter Rangementioning

confidence: 99%

Effects of Al₂O₃ coating on diesel engine performance, combustion, and emission characteristics fueled by pongamia methyl ester and its blends with diesel

Mohamedmusthafa

Sivapirakasam

Udayakumar

et al. 2011

Env Prog and Sustain Energy

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In this study, for the first time, a nano ceramic material of Al 2 O 3 was used as thermal barrier coating in a diesel engine. In the first phase, engine combustion chamber elements (cylinder head, cylinder liner, valves, and piston crown face) were coated with 200 lm thickness nano ceramic material of Al 2 O 3 by using plasma spray-coating method. In second phase, experiments were carried out on Al 2 O 3 -coated engine by using Pongamia methyl ester (PME), PME blends of 20 and 40% by volume with diesel and pure diesel. The test run was repeated on uncoated engine and the results were compared. An increase in engine power and decrease in specific fuel consumption, as well as significant improvements in exhaust gas emissions (except NO x ) and smoke density, were observed for all test fuels used in the Al 2 O 3 -coated engine compared with that of the uncoated engine.

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“…Motor Company, [24,25] General Motors Cooperation, [26] NKG Insulators/Mitsubishi Motors Cooperation, [27] Integral Technology, [28] and other have conducted LHR experimentation. Most of these studies investigated modified conventional direct injection diesel engines.…”

Section: Introductionmentioning

confidence: 99%

An Analysis of Residual Stresses in Thermal Barrier Coatings: A FE Performance Assessment

Taymaz

2009

Plasma Processes & Polymers

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Internal combustion engines have been widely used for past 100 years. In the development of engine components a number of special techniques are used to compact the hostile operating environment, which usually includes high and cyclic forces, high and cyclic temperatures, sliding and often corrosion and/or erosion. In this study, 3‐D finite element structural and thermal analyses were carried out on both uncoated (without coating) and ceramic‐coated engine piston. A 150 µm super alloy bond coating (NiCrAlY) was first applied to the piston. Then, piston was covered by 350 µm thickness of MgZrO3 as top coating. The analysis can be utilized to detect possible thermal problem spots in an engine, and to provide input data for general engine modeling and engine lubrication and wear studies.

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Selective Heat Insulation of Combustion Chamber Walls for a DI Diesel Engine with Monolithic Ceramics

Cited by 33 publications

References 8 publications

Application of Thermal Barrier Coatings in Diesel Engines: a Review

Application of Thermal Barrier Coatings in Diesel Engines: a Review

Effects of Al₂O₃ coating on diesel engine performance, combustion, and emission characteristics fueled by pongamia methyl ester and its blends with diesel

An Analysis of Residual Stresses in Thermal Barrier Coatings: A FE Performance Assessment

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Selective Heat Insulation of Combustion Chamber Walls for a DI Diesel Engine with Monolithic Ceramics

Cited by 33 publications

References 8 publications

Application of Thermal Barrier Coatings in Diesel Engines: a Review

Application of Thermal Barrier Coatings in Diesel Engines: a Review

Effects of Al2O3 coating on diesel engine performance, combustion, and emission characteristics fueled by pongamia methyl ester and its blends with diesel

An Analysis of Residual Stresses in Thermal Barrier Coatings: A FE Performance Assessment

Contact Info

Product

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Effects of Al₂O₃ coating on diesel engine performance, combustion, and emission characteristics fueled by pongamia methyl ester and its blends with diesel