Optimization of Temperature Measurement Technique Used in High Heat Flux Environment

The heat transfer calculations for turbine flows are known to have a substantial degree of uncertainty [1]. Therefore experimental verification of analytical predictions is needed. Properly done, metal temperature measurements could inform a designer about the existence of under-cooled or over-cooled locations, suggesting possible opportunities to improve engine thermodynamic and durability characteristics. Operating in a difficult turbine environment, temperature sensors must be well understood to be able to perform the critical task of thermal mapping accurately. The authors analyzed the influence of factors such as heat flux, sensor positioning, and thermal characteristics of installation assembly on the accuracy of the temperature measured by Crystal Temperature Sensors (CTS) and S-type Thermocouples (TC). The investigation was performed using a numerical simulation of the heat-transfer process taking place in a thin wall with the sensors installed. The recommendations drawn from this experience should help analytical designers and instrumentation engineers optimize experimental techniques and improve the quality of engine test result interpretation.