Calculation of unsteady rotor/stator interaction in a turbomachinery stage

A turbulent unsteady rotor/stator interaction of a turbine stage is calculated. The K-eturbulent model is adopted to simulate the effects of turbulence. A sliding interface technique is employed in conjunction with the newly developed body-fitted grids and non-staggered arrangement techniques to solve the unsteady flow within rotor and stator simultaneously. Phase-Lagged cyclic boundary condition is implemented to accurately simulate the rotor/stator interaction with arbitrary pitch ratio. These techniques can overcome the weakness existing in mixing plane methods for computing the inherent periodic unsteadiness caused by the relative motion between moving/stationary blade rows. An implicit pressure-correction finite volume method is used to deal with the coupling of velocity and pressure. The computational results show that the developed sliding interface method is effective for predicting the turbulent unsteady rotor/stator interaction in turbomachinery.