Conjugate Heat Transfer Analysis for Cooled Low Pressure Turbine Rotor Blade

Conjugate heat transfer (CHT) numerical simulation was carried out to calculate the metal temperatures for a cooled low pressure turbine rotor blade. High-quality fluid and solid domain grid control technique were used in the computational mesh. The two-equation turbulence model Shear Stress Transport (SST) model including the transition model was employed. Metal temperatures calculated with the CHT method were compared to the cooling efficiency test data. The heat transfer characteristics of blades with different cold air flow ratio (1.0%, 1.38%, 1.8% and 2.2%), temperature ratio (2.1, 2.25, 2.3, 2.4 and 2.5) and pressure ratio (1.4, 1.6 and 1.8) were analyzed. The results demonstrated good agreement between predicted and measured airfoil metal temperatures, and the deviation between the experimental and calculated values was only 0.3% on mean surface of blade wall for the design condition. The accuracy of using the CHT method is systematically verified, which provides an effective method for turbine blades heat transfer analysis. © 2020, Editorial Department of Journal of Propulsion Technology. All right reserved.