Unsteady Computational Fluid Dynamic Analysis of the Behavior of Guide Vane Trailing-Edge Injection and Its Effects on Downstream Rotor Performance in a Francis Hydroturbine

作者：Lewis Bryan J^*; Cimbala John M

来源：Journal of Turbomachinery, 2015, 137(8): 081001.

DOI：10.1115/1.4029427

A unique guide vane design, which includes trailing-edge jets, is presented for a mixed-flow Francis hydroturbine. The water injection causes a change in bulk flow direction at the inlet of the rotor. When properly tuned, altering the flow angle results in a significant improvement in turbine efficiency during off-design operation. Unsteady CFD simulations show nearly 1% improvement in overall turbine efficiency with the use of injection. This revolutionary concept also has the ability to reduce the intensity of the rotor-stator interactions (RSI) by compensating for the momentum deficit of the wicket gate wakes. This technology may be equally applied to other turbomachinery devices with problematic rotor-stator flow misalignments.

• 出版日期2015-8