Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

Modification of Turbulent Boundary Layer Flow by Local Wall Vibration

국소 벽면 진동에 의한 난류경계층 유동 변화

  • 김철규 (서울대학교 대학원) ;
  • 전우평 (서울대학교 정밀기계설계공동연구소 난류제어연구단) ;
  • 박진일 (서울대학교 정밀기계설계공동연구소 난류제어연구단) ;
  • 김동주 (서울대학교 대학원) ;
  • 최해천 (서울대학교 정밀기계설계공동연구소 난류제어연구단, 서울대학교 기계항공공학부)
  • Published : 2000.09.01
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, the modification of turbulent boundary layer flow by local wall vibration is investigated. The wall is locally vibrated using a wall deformation actuator, which moves up and down at the frequencies of 100Hz and 50Hz. Simultaneous measurements of the streamwise velocities in the spanwise direction are performed at several wall-normal and streamwise locations using an in-house multi-channel hot wire anemometer and a spanwise hot-wire-probe rake. The mean velocity is reduced in most places due to the wall vibration and its reduced amount becomes small as flow goes downstream. Interestingly, the mean velocity is found to increase very near the wall and near the actuator. This is due to the motion induced by the streamwise vortices which are generated by the downward motion of the actuator. In case of the streamwise velocity fluctuations, their magnitude increases as compared to the unperturbed turbulent boundary layer, and the increased amount becomes small as the flow moves downstream. The modified flow field at the forcing frequency of 50Hz is not much different from that of 100Hz, except the reduced amount of modification.

Keywords

References

  1. Blackwelder, R. F., 1989, 'Some Ideas on the Control of Near-Wall Eddies,' AIAA paper 89-1009
  2. Choi, H., Moin, P. and Kim, J., 1994, 'Active Turbulence Control for Drag Reduction in Wall-Bounded Flows,' J. Fluid Meeh., Vol. 262, pp. 75-110 https://doi.org/10.1017/S0022112094000431
  3. Jacobson, S. A. and Reynolds, W. C., 1998, 'Active Control of Streamwise Vortices and Streaks in Boundary Layers,' J. Fluid Mech., Vol. 360, pp. 179-211 https://doi.org/10.1017/S0022112097008562
  4. Smith, B. L. and Glezer, A., 1998, 'The Formation and Evolution of Synthetic Jets,' Phys. Fluids, Vol. 10, pp. 2281-2297 https://doi.org/10.1063/1.869828
  5. Lorkowski, R., Rathnasingham, R. and Breuer, K. S., 1997, 'Small-Scale Forcing of a Turbulent Boundary Layer,' AIAA paper 97-1792
  6. Tung, S., Hong, W., Huang, J., Ho, C.-M., Liu, C. and Tai, Y.-C., 1995, 'Control of a Streamwise Vortex by a Mechanical Actuator,' Turbulent Shear Flows X, Penn. State Univ., August 14-16
  7. Jeon, W. -P. and Blackwelder, R. F., 2000, 'Perturbations in the Wall Region Using Flush Mounted Piezoceramic Actuators,' Exps. Fluids, Vol. 28(6), pp. 485-496 https://doi.org/10.1007/s003480050410
  8. Carlson, H. A. and Lumley, J. L., 1996, 'Active Control in the Turbulent Wall Layer of a Minimal Flow Unit,' J. Fluid Mech., Vol. 329, pp. 341-371 https://doi.org/10.1017/S0022112096008944
  9. Mito, Y. and Kasagi, N., 1998, 'DNS Study of Turbulence Modification with Streamwise- uniform Sinusoidal Wall-oscillation,' Int. J. Heat and Fluid Flow, Vol. 19, pp. 470-481 https://doi.org/10.1016/S0142-727X(98)10025-5
  10. Endo, T., Kasagi, N., and Suzuki, Y., 1999, 'Feedback Control of Wall Turbulence with Wall Deformation,' 1st Int. Symp. Turbulence & Shear Flow Phenomena, Santa Barbara, pp. 405-410
  11. Breuer, K. S., Haritonidis, J. H. and Landahl, M. T., 1989, 'The Control of Transient Disturbances in a Flat Plate Boundary Layer through Active Wall Motion,' Phys. Fluids A, Vol. 1, pp. 574-582 https://doi.org/10.1063/1.857426
  12. Blackwelder, R. F. and Haritonidis, J. H., 1983, 'Scaling of the Bursting Frequency in Turbulent Boundary Layers,' J. Fluid Mech., Vol. 132, pp. 87-103 https://doi.org/10.1017/S0022112083001494
  13. 신성호, 전우평, 강신형, 1998, '자유유동 난류강도 변화에 따른 평판위 천이 경계층의 유동 특성에 관한 실험적 연구,' 대한기계학회 논문집 B권, 제22권, 제9호, pp. 1335-1348
  14. Clauser, F. H., 1954, 'Turbulent Boundary Layers in Adverse Pressure Gradient,' J. Aeronaut. Sci., Vol. 2, pp. 91-108
  15. Hinze, J. O., 1975, Turbulence, 2nd Edn., McGraw-Hill
  16. Park, J. and Choi, H., 1999, 'Effects of Uniform Blowing or Suction from a Spanwise Slot on a Turbulent Boundary Layer Flow,' Phys. Fluids, Vol. 11, pp. 3095-3105 https://doi.org/10.1063/1.870167