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Accuracy of Quasi-direct Numerical Simulation for Predicting LPT Losses

This paper assesses the accuracy of QDNS simulations for predicting the flow about linear Low-Pressure Turbine cascades. Simulations are performed with a compact highorder numerical scheme based on the Flux Reconstruction method. Numerical results obtained using this technique are compared against a large set of experimental data including pressure tappings, hot-wire and LDV measurements. The experiments have been carried out at the low-speed low-turbulence wind tunnel at the Polytechnic University of Madrid. Measurements were taken at several Reynolds numbers and reduced frequencies. The numerical experiments are instrumented consistently with the physical experiments. Numerical results show excellent agreement with experimental data for every measurement technique and for all the cases. It is concluded that numerical experiments using the present setup deliver data with a similar level of confidence than those obtained in highquality linear cascades, and that the differences between simulations and experiments fall within the experimental uncertainty.