JOURNAL BROWSE
Search
Advanced SearchSearch Tips
Flow structure of wake behind a finite circular cylinder
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Flow structure of wake behind a finite circular cylinder
Lee, Sang-Jun; Jeong,Yong-Sam;
  PDF(new window)
 Abstract
Flow characteristics of the wake behind a finite circular cylinder(FC) mounted on a flat plate was experimentally investigated. Three finite cylinder models having aspect ratio (length to diameter ratio, L/D) of 6,10 and 13 were tested in this study. Wake velocity was measured by a hot-wire anemometry at Reynolds number of 20,000, and the results were compared with those of two-dimensional circular cylinder. As a result, the free-end effect on the wake structure becomes more dominant with decreasing the aspect ratio(L/D) of the finite cylinder. Invisid flow entrained into the wake region decreases the turbulence intensity and periodicity of the vortex shedding due to existence of the free end. From spectral analysis and cross correlation of the velocity signals, vortices having 24Hz frequency characteristics are found in the down wash flow just behind the free end. There exists very complicated flow near the free end due to interaction between the entrained flow and streamwise vortices. Vortex formation region is destroyed significantly in the near wake and shows quite different wake structures from those of 2-D cylinder.
 Keywords
Finite Cylinder;Free End;Cylinder Wake;3-Dimensionality;Hot-Wire Anemometer;
 Language
Korean
 Cited by
1.
대기경계층 내에 놓인 자유단 원주의 형상비가 후류유동에 미치는 영향에 관한 연구,박철우;이상준;

대한기계학회논문집B, 2001. vol.25. 12, pp.1821-1830 crossref(new window)
2.
대기경계층 내에 놓인 실린더의 자유단 형상변화가 후류유동에 미치는 영향에 관한 연구,박철우;이상준;

대한기계학회논문집B, 2003. vol.27. 1, pp.105-116 crossref(new window)
 References
1.
J. Fluid Mech., 1992. vol.234. pp.191-217

2.
JSME Int. J., 1993. vol.36. pp.201-206

3.
J. Fluid Mech., 1981. vol.112. pp.297-314

4.
Experiments in Fluids, 1989. vol.7. pp.293-302

5.
Phys. Fluids A., 1989. vol.1(2). pp.189-192

6.
J.Fluid Mech., 1983. vol.133. pp.265-285

7.
Experiments in Fluids, 1991. vol.10. pp.313-321

8.
AIAA J., 1991. vol.29. pp.2163-2168

9.
J. Fluid Mech., 1983. vol.126. pp.147-165

10.
Trans. ASME, J. Fluids Engineering, 1992. vol.114. pp.512-521

11.
AIAA J., 1981. vol.19. pp.275-281

12.
J. Fluid Mech., 1989. vol.203. pp.557-575

13.
J. Fluid Mech, 1982. vol.114. pp.361-377

14.
Trans. ASME, J. Fluid Engineering, 1977. vol.99. pp.470-479

15.
J. Fluid Mech., 1982. vol.118. pp.1-26