DETAILED NUMERICAL CHARACTERIZATION OF THE SUCTION SIDE LAMINAR SEPARATION BUBBLE FOR A HIGH-LIFT LOW PRESSURE TURBINE BLADE BY MEANS OF (U)RANS AND LES

The scope of this work is to obtain a deep insight of the occurrence, development and evolution of the laminar separation bubble which occurs on the suction side of the T106- C high-lift low pressure turbine blade operated at correct engine Mach and Reynolds numbers. A set of three different Reynolds numbers was numerically investigated by means of different CFD approaches characterized by a progressively increasing level of complexity and detail in the solution, starting from a steady state RANS analysis and ending with a Large Eddy Simulation. Particular attention was paid to the study of the open separation occurring at the lowest Reynolds number, for which a Large Eddy Simulation was performed in order to try to correctly capture the involved phenomena and their characteristic frequencies.