DOI: 10.1615/TSFP6
LARGE EDDY SIMULATION OF FREE-STREAM TURBULENCE EFFECTS ON HEAT TRANSFER TO A HIGH PRESSURE TURBINE CASCADE
要約
Large Eddy Simulation (LES) of an uncooled, transonic, linear HP turbine vane cascade has been pursued using a high-order numerical method with about 83 million grid points. Heat transfer and aerodynamics of the blade is investigated in the presence of free-stream turbulence (FST). Quantitative comparisons with the experiments of Arts et al. (1990) show satisfactory agreement. The distortion of vortices from the inflow turbulence in the cascade passage leads to formation of long streamwise streaky structures, leading to transition of suction side boundary layer. Significant heat transfer augmentation is seen on both the pressure and suction sides due to the presense of these structures. Transition to turbulence, possibly due to streak instability and adverse pressure gradient effects is observed in the last 10% of the blade suction surface.