Uncertainty analysis of adiabatic wall temperature measurements in turbine experiments

This paper illustrates different approaches to estimate the relevant flow parameters that drive the heat transfer based on transient turbine experiments. The work presents a detailed uncertainty analysis associated with the determination of the adiabatic wall temperature and the adiabatic convective heat transfer coefficient based on a multi-test strategy and the use of surface temperature measurements. The present study allows experimental and numerical specialists quantifying the error in the measured or calculated local gas temperature and convective heat transfer coefficient. Conducting such analysis prior to any experimental or numerical campaign will serve to minimize the test uncertainty in adiabatic wall temperature as a function of: turbine operating conditions; wall to gas temperature ratios; heat transfer uncertainty levels; number of experiments.