F208 NUMERICAL AND EXPERIMENTAL INVESTIGATIONS OF UNSTEADY 3-D FLOW THROUGH TWO-STAGE CASCADES IN STEAM TURBINE MODEL(Steam Turbine-3)

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Unsteady 3-D flows through two-stage stator-rotor cascade channels in a low-pressure steam turbine model developed by Mitsubishi Heavy Industry (MHI) are numerically investigated and compared with the experiments. The fundamental equations solved in this study are based on the compressible Navier-Stokes equation and the SST turbulence model in general curvilinear coordinates. The high-order high-resolution finite-difference method based on the fourth-order compact MUSCL TVD (Compact MUSCL) scheme and the Roe's approximate Riemann solver are used for the space discretization of convection terms. A parallelized LU-SGS scheme based on the pipelining algorithm is also employed for the parallel-implicit time-integration. Total pressures, static pressures and yaw angles of flow velocity vectors at the outlet of first-stage rotor, second-stage stator, and second-stage rotor obtained from the computation are compared with the corresponding experiments. Finally the reliability of both numerical and experimental approaches is discussed.

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