Error Analysis and Correction of Radiation Pyrometer in Measuring Surface Temperature of Turbine Blades With the Influence of Reflection

This study develops a methodology to eliminate the reflected radiation in measuring the surface temperature of turbine blades by combining experimental measurements and simulations and calibrating and validating the computational models with experimental measurements. The influences of reflected radiation caused by the front and rear stator vanes, adjacent rotor blades, and background temperature on the temperature measurement error of the target blade are systematically demonstrated through simulation. The temperature measurement errors of the monochromatic method and colorimetric method under the same conditions are compared. Then the corrections on temperature measurement error are carried out under static and moving conditions. Detailed uncertainty analysis is simulated through the Monte Carlo method. Finally, a simplified experiment is carried out, and the results are consistent with the simulation results. This study will open a new avenue for eliminating reflected radiation error and mechanism research for the temperature measurements of the turbine blades.