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Research Papers: Internal Combustion Engines

Preliminary Testing of Metal-Based Thermal Barrier Coating in a Spark-Ignition Engine

[+] Author and Article Information
Michael A. Marr, Larry Pershin, Sanjeev Chandra, Javad Mostaghimi

Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON, M5S 3G8, Canada

James S. Wallace1

Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON, M5S 3G8, Canadawallace@mie.utoronto.ca

1

Corresponding author.

J. Eng. Gas Turbines Power 132(7), 072806 (Apr 21, 2010) (7 pages) doi:10.1115/1.4000298 History: Received May 21, 2009; Revised May 22, 2009; Published April 21, 2010; Online April 21, 2010

A novel metal-based thermal barrier coating was tested in a spark-ignition engine. The coating was applied to the surface of aluminum plugs and exposed to in-cylinder conditions through ports in the cylinder wall. Temperatures were measured directly behind the coating and within the plug 3 and 11 mm from the surface. In-cylinder pressures were measured and analyzed to identify and quantify knock. Test results suggest the coating does not significantly reduce overall heat transfer, but it does reduce the magnitude of temperature fluctuations at the substrate surface. It was found that heat transfer can be reduced by reducing the surface roughness of the coating. The presence of the coating did not promote knock.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Cylinder wall access port configuration

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Figure 2

Aluminum plug drawing

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Figure 3

Internal plug temperatures

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Figure 4

Internal plug temperatures with damaged thread plug

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Figure 5

Effect of surface finish on uncoated plug

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Figure 7

Fast response thermocouple schematic

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Figure 10

Sample cycles with different knock intensities

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Figure 11

Average knock intensity

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Figure 12

Uncoated geometry

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Figure 13

Convection data

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Figure 15

FEM output with 3X heat transfer coefficient

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Figure 9

Individual cycle peak-to-peak temperature swings at substrate surface

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Figure 6

Effect of surface finish on coated plug

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Figure 8

Sample substrate surface temperatures

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