Abstract
The purpose of this paper is to analyze the error in the gas temperature measured by thermocouples. Correlations were established analytically between the dynamic measurement error and the parameters of a thermocouple temperature measuring system. The accuracy of the thermocouple time constant estimation was identified as a crucial factor of the dynamic error. Further, an analysis of the error in an experimentally obtained estimate of the thermocouple time constant was carried out. It revealed that the thermocouple time constant, which well represents its dynamic characteristics, can be accurately estimated with rationally planned experiments. This study provides an in situ analysis that considers the thermocouple as a part of the engine instead of a stand-alone element. The analytical solution demonstrates the correlation behind the errors and dynamic parameters, and pictures a guideline for optimizing the gas temperature measuring system of gas turbine engines.
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