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KSME international journal v.16 no.10, 2002년, pp.1303 - 1313   피인용횟수: 2

Frequency Effects of Upstream Wake and Blade Interaction on the Unsteady Boundary Layer Flow

Kang, Dong-Jin   (School of Mechanical Engineering, Yeungnam UniversityUU0000951  ); Bae, Sang-Su   (School of Mechanical Engineering, Yeungnam UniversityUU0000951  );
  • 초록

    Effects of the reduced frequency of upstream wake on downstream unsteady boundary layer flow were simulated by using a Wavier-Stokes code. The Wavier-Stokes code is based on an unstructured finite volume method and uses a low Reynolds number turbulence model to close the momentum equations. The geometry used in this paper is the MIT flapping foil experimental set-up and the reduced frequency of the upstream wake is varied in the range of 0.91 to 10.86 to study its effect on the unsteady boundary layer flow. Numerical solutions show that they can be divided into two categories. One is so called the low frequency solution, and behaves quite similar to a Stokes layer. Its characteristics is found to be quite similar to those due to either a temporal or spatial wave. The low frequency solutions are observed clearly when the reduced frequency is smaller than 3.26. The other one is the high frequency solution. It is observed for the reduced frequency larger than 7.24. It shows a sudden shift of the phase angle of the unsteady velocity around the edge of the boundary layer. The shift of phase angle is about 180 degree, and leads to separation of the boundary layer flow from corresponding outer flow. The high frequency solution shows the characteristics of a temporal wave whose wave length is half of the upstream frequency. This characteristics of the high frequency solution is found to be caused by the strong interaction between unsteady vortices. This strong interaction also leads to destroy of the upstream wake strips inside the viscous sublayer as well as the buffer layer.


  • 주제어

    Unsteady Boundary Layer Flow, MIT flapping foil, Reduced Frequency, Traveling Wave, Frequency Effects.  

  • 참고문헌 (13)

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    3. Poling, D. R. and Telionis, D. P., 1986, 'The response of Airfoils to Periodic Disturbances-The Unsteady Kutta Condition,' AIAA J. Vol. 24, No. 2, pp. 193-199 
    4. Rice, J. Q., 1991, 'Investigation of Flows around a Two-dimensional Hydrofoil in Steady and Unsteady Flows,' M. S. Thesis, Dept. of Ocean Eng., MIT, Cambridge, MA 
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    7. Paterson, E.G. and Stern, F., 1999, 'Computation of Unsteady Viscous Marine Propulsor Blade Flows-Part 2: Parametric Study,' ASME J. Fluids Engineering, Vol. 121, pp. 121-147 
    8. Kang, D. J., Bae, S. S., and Joo, S. W., 1998, 'An Unstructured FVM for the Numerical Prediction of Imcomressible Viscous Flows,' Transactions of the KSME, Vol. 22, No. 10, pp. 1410-1421 
    9. Kang, D. J., Bae, S. S., 1999a, 'Navier-Stokes Simulation of MIT FFX by Using an Unstructured Finite Volume Method,' ASME Turbo -Expo IGTI-99-214 
    10. Choi, J. E., Sreedhar, M. K., Stern, F., 1996, 'Stokes Layers in Horizontal Wave Outer Flows,' ASME J. Fluids Engineering, Vol. 118, pp. 537-545 
    11. Gissing, J. P., 1969, 'Vorticity and Kutta Con-dition for Unsteady Multi-Energy Flow,' ASME J. Applied Mechanics, Vol. 36, pp. 608-613 
    12. Horlock, J., 1968, 'Fluctuating Lift Forces on an Airfoils Moving through Transverse and Chordwise Gusts,' ASME J. Basic Engineering, pp. 494-500 
    13. Horwich, E. A., 1993, 'Unsteady Response of a Two Dimensional Hydrofoil Subject to High Reduced Frequency Gust Loading,' M. S. Thesis, Dept. of Ocean Eng., MIT, Cambridge, MA 
  • 이 논문을 인용한 문헌 (2)

    1. 2009. "" Journal of mechanical science and technology, 23(6): 1727~1735     
    2. 2014. "" Journal of mechanical science and technology, 28(9): 3733~3740     

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