Heat Transfer Analysis of Damaged Shrouded High-Pressure Turbine Rotor Blades

• Published in: International journal of turbomachinery, propulsion and power propulsion and power, 2023-08, Vol.8 (3), p.24
• Main Authors: Carta, Mario, Ghisu, Tiziano, Shahpar, Shahrokh
• Format: Article
• Language: English
• Subjects: Aerodynamics; Aircraft engine industry; Cooling; Design optimization; Deviation; Equilibrium flow; Flow simulation; Gas turbine engines; Geometry; Heat exchange; Heat transfer; Heat transfer coefficients; High pressure; High resolution; high-pressure turbine; Jet engines; K-omega turbulence model; level set meshing; multi-fidelity simulation; Rotor blades; Rotor blades (turbomachinery); shrouded blade; Three dimensional flow; Turbines
• ISSN: 2504-186X; 2504-186X
• DOI: 10.3390/ijtpp8030024

Due to the increasingly high turbine inlet temperatures, heat transfer analysis is now, more than ever, a vital part of the design and optimization of high-pressure turbine rotor blades of a modern jet engine. The present study aimed to find out how shape deviation and in-service deterioration affect heat exchange patterns on the rotor blade. The rotor geometries used for this analysis are represented by a set of high-resolution 3D structured light scans of blades with the same number of in-service hours. An automatic meshing technique was employed to generate high-resolution meshes directly on the scanned rotor geometries, which captured all the surface features with high fidelity. Steady-state 3D RANS flow simulations with a k-ω SST turbulence model were conducted on a one-and-a-half stage computational domain of the scanned geometries. First, the distribution of the heat transfer coefficient was calculated for each blade; then, a correlation was sought between the heat transfer coefficient and parametrized shape deviation, to assess the impact of each parameter on HTC levels.