International Journal of Fluid Machinery and Systems

Korean Society for Fluid machinery (한국유체기계학회)
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Numerical Prediction of Unsteady Flows through Whole Nozzle-Rotor Cascade Channels with Partial Admission

  • Sasao, Yasuhiro (Department of Computer and Mathematical Sciences, Tohoku University) ;
  • Monma, Kazuhiro (Department of Computer and Mathematical Sciences, Tohoku University) ;
  • Tanuma, Tadashi (Keihin Product Operations, Toshiba Corporation) ;
  • Yamamoto, Satoru (Department of Computer and Mathematical Sciences, Tohoku University)
  • Received : 2009.05.25
  • Accepted : 2009.09.07
  • Published : 2009.09.01
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Abstract

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 also solved for evaluating the eddy-viscosity. The unsteady two-dimensional flows through whole nozzle-rotor cascade channels considering a partial admission are numerically investigated. 108 nozzle passages with two blockages and 60 rotor passages are simultaneously calculated. The influence of the flange in the nozzle box to the lift of rotors is predicted. Also the efficiency of the partial admission stage changing the number of blockages and the number of nozzles is parametrically predicted.

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References

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