Vortex Shedding in a Turbine Cascade

Flow simulations have been performed to examine vortex shedding in a turbine cascasde. Four progressively finer grids were used, and it was found that a very fine grid is required to accurately capture the unsteady flow in the trailing edge region. The predominant shedding frequency in the simulations was in good agreement with the experimental result. The simulations showed that the well-known uniform time-averaged pressure in the base pressure region is composed of the time average of two individual uniform pressure regions oscillating out of phase.