Abstract
Thermocouples are rugged, compact, and simple temperature sensors that are used in measurements of total temperature in gas turbine engines. However, they are generally considered to have inherently low accuracy. This can be a problem as derived parameters in engines are sensitive to errors in total temperature. In this paper, a project to improve the accuracy of the total temperature measurements in a TDI Model 2700 Turbine Powered Simulator (TPS) is described. Multiple techniques, including individual thermocouple calibrations, were used to prepare a thermocouple measurement system with an accuracy specification better than ±0.03 °C. This level of accuracy was verified by using a circulating bath and a platinum reference thermometer. Additional steps were taken to characterize and correct for other sources of error, such as the aerodynamic recovery factors of the total temperature probes. The results suggest that total temperature measurement uncertainty of ~0.1 °C may be achievable.
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