Investigation of the impact of errors and uncertainties in compressor cascade measurements using Large Eddy Simulations

This thesis aims to investigate the reasons behind the discrepancies between experimental data obtained from the wind tunnel at the DLR Institute in Cologne and the results of Large Eddy Simulations (LES) for a compressor cascade. The LES are implemented in DLR's solver using a specific version of the Discontinuous Galerkin method, known as DG-SEM, which is briefly introduced in the beginning. The first analysis focuses on the impact of measurement uncertainties and how they influence the LES results. The second part examines the off-design behavior of the cascade and leads to the hypothesis of a non-homogeneous inflow condition. The final part investigates this non-homogeneous inflow and confirms it as the source of the discrepancies. Additional observations are made by comparing the single blade and cascade configurations, along with the effects of different initial turbulence levels (Tu = 0% and Tu = 0.33%).