Journal of Mechanical Science and Technology

  • 제16권8호
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  • Pages.1144-1153
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  • 2002
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  • 1738-494X(pISSN)
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  • 1976-3824(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
권호 표지

Development of a Performance Prediction Method for Centrifugal Compressor Channel Diffusers

  • Kang, Jeong-Seek (Turbomachinery Department, Korea Aerospace Research Institute P.O.Box 113) ;
  • Cho, Sung-Kook (School of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Kang, Shin-Hyoung (School of Mechanical and Aerospace Engineering, Seoul National University)
  • 발행 : 2002.08.01
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초록

A hybrid performance prediction method is proposed in the present study. A channel diffuser is divided into four subregions: vaneless space, semi-vaneless space, channel, and channel exit region. One-dimensional compressible core flow and boundary layer calculation of each region with an incidence loss model and empirical correlation of residuary pressure recovery coefficient of a channel predict the performance of diffusers. Three channel diffusers are designed and tested for validating the developed prediction method. The pressure distributions from an impeller exit to the channel diffuser exit are measured and discussed for various operating conditions from choke to nearly surge conditions. The strong non-uniform pressure distribution which is caused by impeller-diffuser interaction is obtained over the vaneless and semi-vaneless spaces. The predicted performance shows good agreement with the measured performance of diffusers at a design condition as well as at off-design conditions.

키워드

참고문헌

  1. Blunder, F. S. and Al-Modafar, M. H., 1983, 'Development and Application of a Performance Prediction Method for Straight Rectangular Diffusers,' ASME Journal of Engineering for Power, Vol. 105, pp. 120-124
  2. Dawes, W. N., 1995, 'A Simulation of the Unsteady Interaction of a Centrifugal Impeller with its Vaned Diffuser : Flow Analysis,' ASME Journal of Turbomachinery, Vol. 117, pp. 213-222
  3. Hoffmann, J. A., 1981, 'Effects of Free-Stream Turbulence on Diffuser Performance,' ASME Journal of Fluids Engineering, Vol. 103, pp. 385-390
  4. Hoffmann, J. A. and Fang, L. W., 1988, 'Influence of the Structure of Inlet Free-Stream Turbulence on Diffuser Performance,' AIAA Paper No. 88-3673-CP
  5. Hoffmann, J. A. and Gonzales, G., 1984, 'Effects of Small-Scale, High Intensity Turbulence on Flow in a Two-Dimensional Diffuser,' ASME Journal of Fluids Engineering, Vol. 106, pp. 121-124
  6. Justen, F., Ziegler, K. U. and Gallus, H. E., 1998, 'Experimental Investigation of Unsteady Flow Phenomena in a Centrifugal Compressor Vaned Diffuser of Variable Geometry,' ASME Paper No. 98-GT-368
  7. Kang, J. S., 1998, A Study on the Design and Performance Prediction of Centrifugal Compressor Channel Diffuser, M. S. thesis, Seoul National University, Korea
  8. Kang, J. S., Cho, S. K. and Kang, S. H., 2000, 'Unsteady Flow Phenomena in a Centrifugal Compressor Channel Diffuser,' ASME Paper No. 2000-GT-451
  9. Kang, J. S. and Kang, S. H., 2001, 'A Study on Pressure Distributions in a Centrifugal Compressor Channel Diffuser,' Trans. of KSME, Vol. 25, No. 4, pp. 507-513
  10. Kang, S. H., Kang, J. S. and Cho, S. K., 1998, 'A Hybrid Method of Performance Prediction for Channel Diffusers,' Proceedings of the Fourth KSME-JSME Fluids Engineering Conference, pp. 105-108
  11. Kano, F., Tazawa, N. and Fukao, Y., 1982, 'Aerodynamic Performance of Large Centrifugal Compressors,' ASME Journal of Engineering for Power, Vol. 104, Oct., pp. 796-804
  12. Kline, S. J. and McClintock, F. A., 1953, 'Describing Uncertainties in Single Sample Experiments,' Mechanical Engineering, January
  13. Krain, H., 1981, 'A Study on Centrifugal Impeller and Diffuser Flow,' ASME Journal of Engineering for Power, Vol. 103, pp. 688-697
  14. Krain, H., 1984, 'Experimental Observations of the Flow in Impellers and Diffusers,' VKI Lecture Series, 1984-07
  15. Runstadler, P. W. and Dean, R. C, 1969, 'Straight Channel Diffuser Performance at High Inlet Mach Numbers,' ASME Journal of Basic Engineering, Vol. 91, No. 4 September, pp. 397-422
  16. Runstadler, P. W., Jr. and Dolan, F. X., 1973, 'Further Data on the Pressure Recovery Performance of Straight-Channel, Plane-Divergence Diffusers at High Subsonic Mach Numbers,' ASME Journal of Fluids Engineering, 73-FE-5
  17. Runstadler, P. W., Jr., Dolan, F. X. and Dean, R. C, Jr., 1975, Diffuser Data Book, Creare, TN-186
  18. Saad, M. A., 1993, Compressible Fluid Flow, 2nd ed., Prentice-Hall, pp. 199-232
  19. Sovran, G. and Klomp, E. D., 1965, 'Experimentally Determined Optimum Geometries for Rectilinear Diffusers with Rectangular, Conical or Annular Crosssection,' Fluid Machanics of Internal Flow, General Motors Research Laboratories, Warren, Mich
  20. Stanitz, J. D., 1952, 'One-Dimensional Compressible Flow in a Vaneless Diffusers of Radial and Mixed Flow Centrifugal Compressors, Including Effects of Friction, Heat Transfer and Area Change,' NACA TN 2610
  21. Walz, A., 1969, Boundary Layers of Flow and Temperature, Cambridge : M. I. T. Press
  22. Yoshinaga, Y., Gyobu, I., Mishina, H., Koseki, F. and Nishida, H., 1980, 'Aerodynamic Performance of a Centrifugal Compressor with Vaned Diffusers,' ASME Journal of Fluids Engineering, Vol. 102, pp. 486-493