OPTIMIZATION OF A STEAM TURBINE GUIDE VANE BY END WALL CONTOURING USING EVOLUTIONARY ALGORITHMS

Nils Moser, Franz Joos

Abstract

The subject of this paper is the optimization of a guide vane of steam turbine control stage by end wall contouring. The investigated control stage is derived from an existing industrial steam turbine design. The end wall contour is varied in rotational direction within specified restrictions by an evolutionary algorithm. The algorithm is directly connected to a mesh generator and a Computational Fluid Dynamics (CFD) solver. The optimization goal is the reduction of the total pressure loss over the guide vane. The geometry of the rotor blade has been retained unchanged. The flow field of the varied stage is compared with the baseline geometry. The optimum candidates are further investigated with CFD simulations for different operating point scenarios. Numerical results show that the axisymetric end wall contouring of the nozzle has a considerable effect on the loss behavior of the nozzle over a wide range of pressure ratios. Due to end wall contouring the boundary layer in the nozzle is significantly affected which results in a significant reduction of the secondary flow effects in the guide vanes.

References

  1. Backhaus, K., Erichson, B., Plinke, W., and Weiber, R. (2006). Multivariate Analysemethoden. Springer.
  2. Borg, I., and Groenen, P., 1997. Modern Multidimensional Scaling. Springer.
  3. Dejc, M. E., and Zarjankin, A. E. (1960). Methods of Increasing the Efficiency of Turbine Stages. Teploenergetika, 2, pp. 18-24.
  4. Dejc, M. E., and Trojanovskij, B. M. (1973). Untersuchung und Berechung axialer Turbinenstufen. Berlin: VEB Verlag Technik.
  5. Eymann, S., Foerster, W., Beversdorff, M., Reinmoeller, U., Niehuis, R., and Gier, J. (2002). Improving 3D flow characteristics in a multistage LP turbine by means of endwall contouring and airfoil design modification part 1: design and experimental investigation. In Proceedings of ASME Turbo Expo. ASME Paper GT2002-30352.
  6. Gregory-Smith, F. G. (1997). Secondary and TipClearance Flows in Axial Turbines. VKI LS, 1997-01. Von Karman Institute for Fluid Dynamics, Rhode St. Genese, Belgium.
  7. Hartland, J. C., Gregory-Smith, D. G., Harvey, N. W., and Rose, M. G. (2000). Nonaxisymmetric Turbine End Wall Design: Part II - Experimental Validation. ASME Journal Turbomachinery, 122, 286-293.
  8. Harvey, N. W., Rose, M. G., Taylor, M. D., Shapar, S., Hartland, J. C., and Gregory-Smith, D. G. (2000). Nonaxisymmetric Turbine End Wall Design: Part I - Three-Dimensional Linear Design System. ASME Journal Turbomachinery, 122, 278-285.
  9. Langston, L., 2001. Secondary Flows in Axial Turbines - A Review. Annals of New York Academy Sciences, 934.
  10. Moustapha, S. H., and Williamson, R. G. (1985). Investigation of the Effect of two Endwall Contours on the Performance of an Annular Nozzle Cascade. Proceedings of AIAA. AIAA-85-1218.
  11. Rechenberg, I. (1994). Evolutionsstrategie 7894. Stuttgart: Frommann-Holzboog.
  12. Rose, M. G. (1994). Non-axisymmetric Endwall Profiling in the HP NGVs of an Axial Flow Gas Turbine. Proceedings of ASME Turbo Expo. ASME Paper No. 94-GT-249.
  13. Seber, G. A. F. (1984). Multivariate Observations. Wiley.
  14. Sieverding, C. H. (1985). Recent progress in the understanding of basic aspects of secondary flows in a turbine blade cascade. ASME Journal of Engineering Gas Turbines and Power, 107(2), 248-252.
  15. Weicker, K. (2002). Evolutionaere Algorithmen. Teubner Verlag.
Download


Paper Citation


in Harvard Style

Moser N. and Joos F. (2010). OPTIMIZATION OF A STEAM TURBINE GUIDE VANE BY END WALL CONTOURING USING EVOLUTIONARY ALGORITHMS . In Proceedings of the International Conference on Evolutionary Computation - Volume 1: ICEC, (IJCCI 2010) ISBN 978-989-8425-31-7, pages 327-331. DOI: 10.5220/0003074603270331


in Bibtex Style

@conference{icec10,
author={Nils Moser and Franz Joos},
title={OPTIMIZATION OF A STEAM TURBINE GUIDE VANE BY END WALL CONTOURING USING EVOLUTIONARY ALGORITHMS},
booktitle={Proceedings of the International Conference on Evolutionary Computation - Volume 1: ICEC, (IJCCI 2010)},
year={2010},
pages={327-331},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0003074603270331},
isbn={978-989-8425-31-7},
}


in EndNote Style

TY - CONF
JO - Proceedings of the International Conference on Evolutionary Computation - Volume 1: ICEC, (IJCCI 2010)
TI - OPTIMIZATION OF A STEAM TURBINE GUIDE VANE BY END WALL CONTOURING USING EVOLUTIONARY ALGORITHMS
SN - 978-989-8425-31-7
AU - Moser N.
AU - Joos F.
PY - 2010
SP - 327
EP - 331
DO - 10.5220/0003074603270331