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RESEARCH PAPERS: Internal Combustion Engines

The Effects of Thermal Barrier Coatings on Diesel Engine Emissions

[+] Author and Article Information
M. Vittal, J. A. Borek, D. A. Marks, A. L. Boehman

Department of Energy and Geo-Environmental Engineering, The Pennsylvania State University, University Park, PA 16802-5000

D. A. Okrent

Rupprecht and Patashnick Company, Inc., 25 Corporate Circle, Albany, NY 12203

A. P. Bentz

JBL Associates, Inc., P.O. Box 7191, Groton, CT 06340-7191

J. Eng. Gas Turbines Power 121(2), 218-225 (Apr 01, 1999) (8 pages) doi:10.1115/1.2817108 History: Received February 21, 1998; Revised December 29, 1998; Online December 03, 2007

Abstract

This study has characterized the influence of thermal barrier coatings (TBCs) applied to combustion chamber surfaces on the emissions from an indirect injection (IDI) diesel engine. The TBCs were applied to the piston crown, the cylinder head (fire deck) and the valves of a single cylinder Yanmar TS-180 IDI diesel utility engine. The gaseous and particulate emissions from the baseline (uncoated) and ceramic-coated engine were analyzed to assess the changes in the combustion process caused by the coatings. The results of these analyses show two clear trends during operation of the baseline and ceramic-coated engine. First, comparison of the emissions from the four modes of operation for the baseline (uncoated) engine shows that particulate matter emissions (on a g/kWh basis) are highest at low load-low speed (mode 4) conditions. At low load-low speed conditions (modes 3 and 4), particulate matter decreases substantially with the TBCs present. Second, these observations combined with thermal and morphological analyses of the particulate matter show that the TBCs reduce particulate mass by reducing the volatile organic content of the particulate.

Copyright © 1999 by The American Society of Mechanical Engineers
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