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Numerical Analysis of the Whole Field Flow in a Centrifugal Fan for Performance Enhancement - The Effect of Boundary Layer Fences of Different Configurations

Karanth, K. Vasudeva    (Department of Mechanical Engineering, Manipal University Manipal Institute of Technology   ); Sharma, N. Yagnesh    (Department of Mechanical Engineering, Manipal University Manipal Institute of Technology  );
  • 초록

    Generally the fluid flows within the centrifugal impeller passage as a decelerating flow with an adverse pressure gradient along the stream wise path. This flow tends to be in a state of instability with flow separation zones on the suction surface and on the front shroud. Hence several experimental attempts were earlier made to assess the efficacy of using boundary layer fences to trip the flow in the regions of separation and to make the flow align itself into stream wise direction so that the losses could be minimized and overall efficiency of the diffusion process in the fan could be increased. With the development of CFD, an extensive numerical whole field analysis of the effect of boundary layer fences in discrete regions of suspected separation points is possible. But it is found from the literature that there have been no significant attempts to use this tool to explore numerically the utility of the fences on the flow field. This paper attempts to explore the effect of boundary layer fences corresponding to various geometrical configurations on the impeller as well as on the diffuser. It is shown from the analysis that the fences located on the impellers near the trailing edge on pressure side and suction side improves the static pressure recovery across the fan. Fences provided at the radial mid-span on the pressure side of the diffuser vane and near the leading edge and trailing edge of the suction side of diffuser vanes also improve the static pressure recovery across the fan.


  • 주제어

    Boundary layer fence .   Flow separation .   Sliding mesh .   Unsteady analysis .   Recirculation zone .   Jets and wakes.  

  • 참고문헌 (20)

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    4. Sharma, N.Y., 1981, “Investigation of Boundary layer Fences on the Exit Flow Characteristics in a Centrifugal CompressorImpeller,” M.Tech Dissertation, IIT, Madras, India. 
    5. Chung, J.T., Simon, T.W., and Buddhavarapu, J., 1991, “Three-Dimensional Flow Near the Blade/Endwall Junction of a GasTurbine: Application of a Boundary Layer Fence,” ASME Paper No. 91-GT-45. 
    6. Chung, J.T., and Simon, T.W., 1993, “Effectiveness of the Gas Turbine Endwall Fences in Secondary Flow Control atElevated Free stream Turbulence Levels,” ASME Paper No. 93-GT-51. 
    7. Kawai, T., 1994, “Effect of Combined Boundary Layer Fences on Turbine Secondary Flow and Losses,” JSME internationaljournal. Series B, Fluids and Thermal Engineering, vol. 37, no. 2, pp. 377-384. 
    8. Rizzo, D.H., 1994, “The Aerodynamic and Heat Transfer Effects of an Endwall Boundary Layer Fence in a 90 Degree TurningSquare Duct,” M.S. Thesis Pennsylvania State Univ., University Park, PA. Dept. of Aerospace Engineering, United States. 
    9. Cengiz C. and Rizzo, D.H., 2002, “Secondary Flow and Forced Convection Heat Transfer Near Endwall Boundary LayerFences In a 90 degree Turning Duct,” International Journal of Heat and Mass Transfer, 45. pp. 831-843. 
    10. Konishi, T., Sakai, T. and Whitfield, A., 1998, “Performance Improvement of a Mixed-Flow Fan Through the Application ofGuide Fences in the Vaneless Diffuser,” Proceedings of the Institution of Mechanical Engineers, Part- A: Journal of Power and]Energy, Professional Engineering Publishingy, Volume 212, No. 4, pp. 217-224. 
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    14. Fatsis, A., Pierret, S. and Van den Braembussche, R., 1997, “Three-dimensional unsteady flow and forces in centrifugalimpellers with circumferential distortion of the outlet static pressure,” Journal of Turbomachinery, 119, pp 94-102. 
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    16. Hillewaert, K. and Van den Braembussche, R.A., 1999, “Numerical simulation of impeller-volute interaction in centrifugalcompressors,” Journal of Turbomachinery, 121, pp 603-608. 
    17. Shi, F. and Tsukamoto, H., 2001, “Numerical Study of Pressure Fluctuations Caused by Impeller-Diffuser Interaction in aDiffuser Pump Stage,” Transactions of the ASME, 9, Vol. 123, pp. 466-474. 
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    20. Fluent 6.3, Fluent Inc., 2006. 

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