Performance of Thin Thermal Barrier Coating on Small Aluminum Block Diesel Engine

Osawa, Katsuyuki; Kamo, Roy; Valdmanis, E.

doi:10.4271/910461

Cited by 35 publications

(11 citation statements)

References 4 publications

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“…In the 1980s, a large number of investigations were conducted on various aspects of applying heat insulation to internal combustion engines [1,2,3,4,5,6,7]. The idea was to insulate heat flow from the working gas to the combustion chamber wall, using the materials with low-heat-conductivity and high-heat-capacity.…”

Section: Introductionmentioning

confidence: 99%

Concept of “Temperature Swing Heat Insulation” in Combustion Chamber Walls, and Appropriate Thermo-Physical Properties for Heat Insulation Coat

Kosaka¹,

Wakisaka²,

Nomura³

et al. 2013

SAE Int. J. Engines

111

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The aim of this work is to investigate the possibility of heat insulation by "Temperature Swing", that is temperature fluctuation, on combustion chamber walls coated with low-heat-conductivity and low-heat-capacity materials.Adiabatic engines studied in the 1980s, such as ceramic coated engines, caused constantly high temperature on combustion wall surface during the whole cycle including the intake stroke, even if it employed ceramic thermal barrier coating methods. This resulted in increase in NOx and Soot, decrease in volumetric efficiency and combustion efficiency, and facilitated the occurrence of engine knock.On the other hand, "Temperature Swing" coat on the combustion chamber walls leads to a large change in surface temperature. In this case, the surface temperature with this insulation coat follows the transient gas temperature, which decreases heat loss with the prevention of intake air heating, and also which is expected to prevent NOx and Soot from increasing. In our calculations, the increase of the surface temperature fluctuation, "Temperature Swing" results from the coat of lower heat conductivity and lower heat capacity. Particularly in Gasoline engines, the coat with the appropriate thickness can reduce the heat flux from the wall to the working gas during intake stroke and can avoid engine knock.Based on our calculations, it is clarified that both the prevention of intake air heating and the low heat rejection were successfully possible with the material of appropriate thermo-physical properties.In addition to the calculations, a preliminary test-piece experiment was executed. It was demonstrated that the surface temperature of a porous coat, that is a candidate of "Temperature Swing" coat, immediately follows the transient gas temperature, and also the proposed insulation coat can exactly reduce the heat flux in the single-cylinder engine.

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Section: Introductionmentioning

confidence: 99%

Concept of “Temperature Swing Heat Insulation” in Combustion Chamber Walls, and Appropriate Thermo-Physical Properties for Heat Insulation Coat

Kosaka¹,

Wakisaka²,

Nomura³

et al. 2013

SAE Int. J. Engines

111

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show abstract

“…The selection of the best insulating coating significantly increases the efficiency of the gas turbine because either the cooling flow can be reduced or a higher turbine inlet temperature (TIT) can be achieved. 4 Thermal properties of TBCs, apart from the intrinsic thermal properties of the coating material, depend on the deposition technique used and the process parameters. These factors affect on the content, the shape and the orientation of porosity inside the TBC.…”

Section: Introductionmentioning

confidence: 99%

Modelling of thermal conductivity of porous materials: application to thick thermal barrier coatings

Cernuschi

Ahmaniemi

Vuoristo

et al. 2004

Journal of the European Ceramic Society

157

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“…The results for 0.5 mm case show 10 % improvement in thermal efficiency, while for the 1 mm case results were contrariwise. In 1991, Osawa et al [13] and Assanis et al [12] both confirmed that thin insulation resulted in better improvement of thermal efficiency than thick coating; however, the heat loss is lower. In 1989, Kamo et al [14] acknowledged that thin coating could dramatically improve volumetric efficiency, power brake, anti-wear properties and engine life, if the TBC has appropriate properties such low friction coefficient, capacity of lubrication and high durability.…”

Section: Introductionmentioning

confidence: 93%

The multi-zone model of the low heat rejection engine for DI diesel injection engines

Ghorbani

Sasan

2015

J Braz. Soc. Mech. Sci. Eng.

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Performance of Thin Thermal Barrier Coating on Small Aluminum Block Diesel Engine

Cited by 35 publications

References 4 publications

Concept of “Temperature Swing Heat Insulation” in Combustion Chamber Walls, and Appropriate Thermo-Physical Properties for Heat Insulation Coat

Concept of “Temperature Swing Heat Insulation” in Combustion Chamber Walls, and Appropriate Thermo-Physical Properties for Heat Insulation Coat

Modelling of thermal conductivity of porous materials: application to thick thermal barrier coatings

The multi-zone model of the low heat rejection engine for DI diesel injection engines

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