Study on the Correction Method of Radiant Temperature Measurement of Turbine Blades Under the Background of High-Temperature Dynamics

Abstract

The turbine blades operate under high temperature and high pressure conditions, and when using radiation thermometry, the influence of radiation from surrounding blades leads to measurement errors. To address this issue, this paper develops a three-dimensional discretized dynamic radiation transfer model based on the blade shape of the turbine. The relationship between the radiation angle coefficient of the surrounding blades and the rotation angle of the blade under test is analyzed. The radiation angle coefficient is calculated using the triangular element method, and temperature inversion is performed based on the effective emissivity to compute the measurement error. The results show that under dynamic high-temperature conditions, at a selected test point with specific simulation conditions, the error induced by reflection can reach up to 25.58 K. This study provides a reference for radiation thermometry in dynamic high-temperature environments.