B-8 部分流入タービンノズル段を通る非定常流れの数値解析(空力・タービン,一般講演)

概要

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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. First, 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. Secondary, the characteristic of the output ratio to the flow rate ratio is predicted.
2009-10-21