J0501-2-6 部分流入タービンノズル段の全周流動解析による性能予測(流体機械の研究開発におけるEFD/CFD(2))

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This paper presents a numerical study for unsteady flows in a high-pressure steam turbine with a partial admission stage. Compressible Navier-Stokes equations are solved by the high-order high-resolution finite-difference method based on the fourth-order compact MUSCL TVD scheme, Roe's approximate Riemann solver, and the LU-SGS scheme. The SST-model is used for evaluating the eddy-viscosity. As numerical examples, unsteady two-dimensional flows in a partial admission stage of steam turbine are calculated. The effect of the blockage to the lift of rotors is numerically investigated. The performance of several types of partial admission stage is parametrically predicted. The output ratio and the efficiency were improved by dividing the blockage regions.
2009-09-12