Numerical simulation of unsteady blade row interactions induced by passing wakes

A numerical study of the unsteady phenomena resulting of periodic passing wakes is presented. An unsteady passing wake boundary condition is implemented in a three-dimensional Navier-Stokes code. Unsteady computations are performed to evaluate the capability of the code to simulate the rotor-stator interaction flow. The analysis of the flow structures shows the vortical disturbances and the migration of the incoming wakes through the blade passage. This physical analysis allows to separate the main origins of the losses.