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Dynamic Characteristics of the Radial Clearance Flow between Axially Oscillating Rotational Disk and Stationary Disk

Horiguchi, Hironori    (Graduate School of Engineering Science, Osaka University   ); Ueno, Yoshinori    (Graduate School of Engineering Science, Osaka University   ); Takahashi, Koutaro    (School of Engineering Science, Osaka University   ); Miyagawa, Kazuyoshi    (Takasago Research and Development Center Mitsubishi Heavy Industries, Ltd.   ); Tsujimoto, Yoshinobu    (Graduate School of Engineering Science, Osaka University  );
  • 초록

    Dynamic characteristics of the clearance flow between an axially oscillating rotational disk and a stationary disk were examined by experiments and computations based on a bulk flow model. In the case without pressure fluctuations at the inlet and outlet of the clearance, parallel and contracting flow paths had an effect to stabilize the axial oscillation of the rotating disk. The enlarged flow path had an effect to destabilize the axial oscillation due to the negative damping and stiffness for outward and inward flows, respectively. It was shown that the fluid force can be decomposed into the component caused by the inlet or outlet pressure fluctuation without the axial oscillation and that due to the axial oscillation without the inlet or outlet pressure fluctuation. A method to predict the stiffness and damping coefficients is proposed for general cases when the device is combined with an arbitrary flow system.


  • 주제어

    Pump .   Flow Induced Vibration .   Axisymmetric Flow .   Clearance Flow .   Balance Disk .   Bulk Flow Model.  

  • 참고문헌 (5)

    1. Makay, E. and Szamody, O., 1978, "Survey of Feed Pump Outages," Final Report of Research Project 641, Electric PowerResearch Institute, FP-754, pp. 4_10-4_12 and pp. A-35. 
    2. Inada, F. and Hayama, S., 1987, "A Study on Leakage-Flow-Induced Vibrations (1st Report, Fluid-Dynamic Forces Acting onthe Walls of an One-Dimensional, Narrow, Tapered Passage)," Trans. Jpn. Soc. Mech. Eng., Ser. C, Vol. 53, No. 488, pp. 933-939(in Japanese). 
    3. Childs, D. W., 1991, "Fluid-Structure Interaction Forces at Pump-Impeller-Shroud Surfaces for Axial Vibration Analysis,"ASME Trans. J. Vibration and Acoustics, Vol. 113, No. 1, pp. 108-115. 
    4. Hsu, Y. and Brennen, C. E., 2002, "Fluid Flow Equations for Rotordynamic Flows in Seals and Leakage Paths," ASME Trans.J. Fluids Eng., Vol. 124, No. 1, pp. 176-181. 
    5. Hirs, G. G., 1973, "A Bluk-Flow Theory for Turbulence in Lubricant Film," ASME Trans. J. Lubrication Technology, pp. 137-146. 

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