On Heat Transfer Measurements in Diesel Engines Using Fast-Response Coaxial Thermocouples

[+] Author and Article Information
D. N. Assanis, E. Badillo

Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Champaign, IL 61801

J. Eng. Gas Turbines Power 111(3), 458-465 (Jul 01, 1989) (8 pages) doi:10.1115/1.3240276 History: Received August 01, 1988; Online October 15, 2009


Finite element models of fast-response CO-AX thermocouples typically used for heat transfer measurements in diesel engines have been developed. Due to the small differences in thermal properties between the thermoelements and the iron engine components, CO-AX thermocouples are capable of measuring transient temperatures of iron components within an accuracy of 98 percent. However, these relatively small errors in temperature measurement result in as high as 25 percent errors in peak surface heat flux calculations. This implies that heat flux results depend not only on the temperature of the surface thermocouple junction, but are also sensitive to its time rate of change. Increasing the thin film thickness can significantly alter the heat flux profile deduced from surface junction temperatures.

Copyright © 1989 by ASME
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