Journal of the Korean Society of Visualization (한국가시화정보학회지)

The Korean Society of Visualization (한국가시화정보학회)
권호 표지
DOI QR코드

DOI QR Code

Optimization Study of Pulsating Jet to Reduce the Separation Bubble behind the Fence

후방 박리기포 감소를 위한 맥동제트의 최적화 연구

  • 최영호 (경상대학교 기계항공공학부 대학원) ;
  • 강인수 (경상대학교 기계항공공학부 대학원) ;
  • 김형범 (경상대학교 기계항공공학부 항공기부품기술연구소)
  • Published : 2008.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

We carried out the experiments which controled the periodic jet in front of the fence to alter the fence wake. The experiments were performed in circulating water channel and the vertical fence was submerged in the boundary layer. The frequency, jet nozzle distance and speed of jet passing the slit were investigated. Each case divided into 20 phases and phase-averaged results were compared with uncontrolled fence flow. From the results, we found the specific frequency and nozzle distance which were good for reducing the reattachment length. In this case, the reattachment length was decreased 35% compared with the uncontrolled fence flow.

Keywords

References

  1. Good, M. C. and Joubert, P. N., 1968, "The Form Drag of Two-dimensional Bluff-plates Immersed in Turbulent Boundary Layers," J. Fluid Mech., Vol.31, pp. 547-582. https://doi.org/10.1017/S0022112068000327
  2. Castro, I. P. and Fackrell, J. E., 1978, "A Note on Two-dimensional Fence Flows, with Emphasis on Wall Constraints," J. I. Aerodynamics, Vol.3, pp. 1- 20. https://doi.org/10.1016/0167-6105(78)90025-9
  3. Gad-el-Hak, M., 2006, Flow Control : Passive, Active, and Reactive Flow Management, Cambridge, New York.
  4. Chun, K. B. and Sung, H. J., 1996, "Control of Turbulent Separated Flow over a Backward-facing Step by Local Forcing," Exp. in Fluids, Vol.21, pp.417-426.
  5. Siller, H. A. and Fernholz, H. H., 2007, "Manipulation of the reverse-flow region downstream of a fence by spanwise vortices," E.J.M. B/Fluid, Vol.26, pp. 236- 257 https://doi.org/10.1016/j.euromechflu.2006.05.005
  6. Orellano, A. and Wengle, H., 2001, "POD Analysis of Coherent Structures in Forced Turbulent Flow over a Fence," J. Turbulence, Vol.2 008.
  7. Choi, Y. H. and Kim, H. B., 2008, "Study of Wake Control by Blowing and Suction in Front of the Vertical Fence," KSME., Vol.32, pp. 47-53.
  8. Adrian, R. J., Christensen, K. T. and Liu, Z. C., 2000, "Analysis and Interpretation of Instantaneous Turbulent Velocity Fields," Exp. in Fluids, Vol.29, pp.275-290. https://doi.org/10.1007/s003489900087