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Heat Loss Analysis of a Steel Piston and a YSZ Coated Piston in a Heavy-Duty Diesel Engine Using Phosphor Thermometry Measurements
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Internal Combustion Engines.ORCID iD: 0000-0001-9483-7992
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2017 (English)In: SAE International Journal of Engines, ISSN 1946-3936, E-ISSN 1946-3944, Vol. 10, no 4Article in journal (Refereed) Published
Abstract [en]

Diesel engine manufacturers strive towards further efficiency improvements. Thus, reducing in-cylinder heat losses is becoming increasingly important. Understanding how location, thermal insulation, and engine operating conditions affect the heat transfer to the combustion chamber walls is fundamental for the future reduction of in-cylinder heat losses. This study investigates the effect of a 1mm-thick plasma-sprayed yttria-stabilized zirconia (YSZ) coating on a piston. Such a coated piston and a similar steel piston are compared to each other based on experimental data for the heat release, the heat transfer rate to the oil in the piston cooling gallery, the local instantaneous surface temperature, and the local instantaneous surface heat flux. The surface temperature was measured for different crank angle positions using phosphor thermometry. The fuel was chosen to be n-heptane to facilitate surface temperature measurements during non-skip-fire, thermally stabilized operating conditions. Assuming one-dimensional heat transfer inside each piston, the local instantaneous surface heat flux was calculated using the heat transfer rate to the oil in the piston cooling gallery and the surface temperature measurements. The results from this study show that the surface temperature variation is similar for both pistons. The instantaneous heat flux during combustion is however significantly greater for the steel piston than the coated piston. The heat release analysis also indicates that combustion is slower for the piston with the yttria-stabilized zirconia coating.

Place, publisher, year, edition, pages
SAE International , 2017. Vol. 10, no 4
Keyword [en]
Atmospheric temperature, Coatings, Combustion chambers, Diesel engines, Engine cylinders, Engine pistons, Engines, Heat flux, Heat losses, Heat transfer, Heptane, Light emission, Phosphors, Pistons, Plasma spraying, Surface properties, Temperature measurement, Thermal insulation, Thermometers, Yttrium alloys, Zirconia, Combustion chamber walls, Engine operating conditions, Heavy-duty diesel engine, Instantaneous surface temperatures, Surface temperature measurement, Surface temperature variation, Yttria stabilized zirconia coatings, Yttria-stabilized zirconias (YSZ), Yttria stabilized zirconia
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-216541DOI: 10.4271/2017-01-1046ISI: 000416807900053Scopus ID: 2-s2.0-85018343474OAI: oai:DiVA.org:kth-216541DiVA: diva2:1160205
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QC 20171124

Available from: 2017-11-24 Created: 2017-11-24 Last updated: 2017-12-18Bibliographically approved

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Cronhjort, Andreas

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