A thin-film thermocouple for transient heat transfer measurements in ceramic-coated combustion chambers
โ Scribed by Dennis N. Assanis; Francis A. Friedmann
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 768 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0735-1933
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โฆ Synopsis
A chromel-alumel overlapping thin-film thermocouple (TFTC) has been developed for transient heat transfer measurements in ceramic-coated combustion chambers. The TFTC was first evaluated using various metallurgical techniques, and calibrated against a standard thermocouple. Subsequently, the TFTC was tested in a diesel engine combustion chamber operating at 1900 rpm and full load. A mean temperature of 613 K with a cyclic swing of 55 K was measured for a ceramic-coated chamber surface. Calculations showed a dramatic reduction in transient heat flux into the surface with the application of the ceramic coating.
๐ SIMILAR VOLUMES
The importance of frequency response considerations in the use of thin-film gauges for unsteady heat transfer measurements in transient facilities is considered, and methods for evaluating it are proposed. A departure frequency response function is introduced and illustrated by an existing analog ci