A Comparison of Hybrid Reynolds Averaged Navier Stokes/Large Eddy Simulation (RANS/LES) and Unsteady RANS Predictions of Separated Flow for a Variable Speed Power Turbine Blade Operating with Low Inlet Turbulence Levels
Abstract
A comparison of hybrid Reynolds-averaged Navier-Stokes/Large-Eddy Simulation (RANS/LES) 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 that was tested in NASA Glenn Research Centers Transonic Turbine Blade Cascade Facility. A commercial, off-the-shelf software package, Pointwise and CFD++ , was used for the grid generation and computations. Simulations were assessed at low inlet turbulence levels for positive and negative incidence angles that represent turbine cruise and takeoff conditions. Comparisons of results for blade loading and loss were made to test data from the transonic tunnel. Comparisons of results for separation predictions were made between the hybrid RANS/LES and RANS computations. Comparisons of separation prediction revealed significant differences in location and extent of separation between the models and grid types.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 2017
- Accession Number
- AD1041446
Entities
People
- David T. Booth
Organizations
- United States Army Research Laboratory