Numerical sim7lation of turbulent cascade flows involving high turning angles

摘要

Numerical simulations of three dimensional turbulent incompressible flows through linear cascades of turbine rotor blades with high turning angles have been performed using a generalized κ-ε model which is a high reynolds number form and derived by RNG (renormal- ized group) method to account for the variation of the rate of strain. The convective terms are approximated by using a second order upwind scheme to suppress numerical diffusion. Boundary-fitted coordinates are adopted to represent the complex cascade geometry accurately.