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A Comparison of Hybrid Reynolds-Averaged Navier-Stokes/Large-Eddy Simulation (RANS/LES) and Unsteady RANS Predictions of Separated and Transitional Flow for a Variable-Speed Power-Turbine Blade

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CCDC Army Research Laboratory Aberdeen Proving Ground United States

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A comparison of hybrid Reynolds-Averaged Navier-StokesLarge-Eddy Simulation RANSLES and unsteady RANS computations for unsteady separated flow prediction of a linear turbine-blade cascade operating with large incidence angle variation is described. The computations comprise a periodic single blade that represents the midspan section of a variable-speed power-turbine blade. A commercial off-the-shelf software package, Pointwise and CFD , was used for the grid generation and computations. Simulations were assessed at incidence angles that represent turbine cruise and takeoff conditions. Comparisons of results for blade loading and loss were made to test data from NASA Glenn Research Centers Transonic Turbine Blade Cascade Facility. Comparisons of results for separation and transition predictions were made between the hybrid RANSLES and RANS computations. Using the model that compared best to experimental results, the RANS Langtry-Menter model, further predictions of blade performance were made at engine-relevant pressure, temperature, and Mach conditions.

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Technical Report,05 Sep 2017,30 Sep 2018



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Approved For Public Release;

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