Abstract
Unsteady RANS simulations were performed to clarify unsteady aerodynamic interaction in a turbine stage performance. Blade-count ratio is almost the same as that of the real turbine concerned. The flow fields are measured for three axial spacings between rotor and stator using five-hole pitot probe downstream of the blade row, and we have compared experimental time-averaged pneumatic pressure data with the corresponding numerical results. Detailed comparisons are then made to elucidate the effect of the axial spacing especially on the stage performance from a time-averaged and unsteady point of view.
