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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  );
  • 초록

    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.


  • 주제어

    Numerical Study .   Steam Turbine .   Unsteady Flow .   Partial Admission .   Nozzle-rotor Cascade Channels.  

  • 참고문헌 (11)

    1. Cho, S., Cho, C. and Kim, C., 2006, “Performance Prediction on a Partially Small Axial-Type Turbine,” JSME International Journal, Series B, Vol. 49, No. 4, pp. 1290-1297. 
    2. He, L., 1997, “Computation of Unsteady Flow through Steam Turbine Blade Rows at Partial Admission,” Proceedings of Institution of Mechanical Engineers, Vol. 211, Part A, pp. 197-205. 
    3. Sakai, N., Harada, T. & Imai, Y., 2006, “Numerical Study of Partial Admission Stages in Steam Turbine,” JSME International Journal, Series B, Vol. 49, No. 2, pp. 212-217. 
    4. Sasao, Y. and Yamamoto, S., 2005, “Numerical Prediction of Unsteady Flows through turbine Stator-rotor Channels with Condensation,” Proceeding of ASME Fluids Engineering Summer Conference, FEDSM 2005-77205, CD-ROM. 
    5. Yamamoto, S., Sasao, Y., Sato S. and Sano K., 2007, “Parallel-Implicit Computation of Three-dimensional Multistage Stator-Rotor Cascade Flows with Condensation,” Proceedings of the 18th AIAA Computational Fluid Dynamics Conference, CDROM(paper#4460). 
    6. Menter, F.R., 1994, “Two-Equation Eddy-Viscosity Turbulence Models for Engineering Applications,” AIAA Journal, Vol. 32, No. 8, pp. 1598-1605. 
    7. Yamamoto, S. and Daiguji H., 1993, “Higher-Order-Accurate Upwind Schemes for Solving the Compressible Euler and Navier-Stokes Equations,” Computers and Fluids, Vol. 22, No. 2/3, pp. 259-270. 
    8. Roe, P.L., 1981, “Approximate Riemann Solvers, Parameter Vectors, and Difference Schemes,” Journal of Computational Physics, Vol. 43, pp. 357-372. 
    9. Yoon, S. and Jameson, A., 1988, “Lower-upper Symmetric-Gauss-Seidel Method for the Euler and Navier-Stokes Equations,” AIAA Journal, Vol. 26, pp. 1025-1026. 
    10. Fridh, J.A., 2002, “Experimental Configuration and Partial Admission,” Technical Report, SNEA Project P12457-2. 
    11. IAPWS, 1997, “Release on the IAPWS Formulation 1997 for the Thermodynamic Properties of Water and Steam”. 

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