Journal
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
Volume 19, Issue 6, Pages 599-612Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/1468087417729254
Keywords
Thermal barrier materials; in-cylinder insulation; temperature swing insulation; gas permeability losses; porous coatings
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Materials that enable wall temperature swing to follow the gas temperature throughout a reciprocating internal combustion engine cycle promise the greatest benefits from in-cylinder insulation without detriments to volumetric efficiency or fuel autoignition behavior. An anisotropic barium-neodymium-titanate insulation was selected as a promising off-the-shelf material to begin investigating temperature swing characteristics while maintaining adequate strength and adherence to the aluminum components it was applied to. Experimental analysis showed that permeable porosity within the barium-neodymium-titanate coating resulted in increased heat losses despite thermal insulation, fuel absorption losses, and a reduction in compression ratio. Additionally, the thickest coating suffered severe degradation throughout testing. Any potential benefits of temperature swing insulation were dominated by these losses, emphasizing the need to maintain a sealed coating surface.
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