Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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Investigations into the Cylinder Flow Stabilities with a Thin Film Attachment

  • Doh, Deog-Hee (Div. of Mech. & Energy Systems Eng., Korea Maritime Univ.) ;
  • Jo, Hyo-Je (Div. of Naval Arch. & Ocean Systems Eng., Korea Maritime Univ.) ;
  • Kwon, Seang-Yong (Dept. of Refrigeration and Air-conditioning Eng., Graduate School, Korea Maritime Univ.) ;
  • Kim, Hyoung-June (Dept. of Refrigeration and Air-conditioning Eng., Graduate School, Korea Maritime Univ.) ;
  • Cho, Gyeang-Rae (Research Inst. of Ocean Science and Tech., Korea Maritime Univ.) ;
  • Shin, Byeong-Rog (Dept. of Mech. Eng., Changwon Natioonal Univ.)
  • Received : 2011.11.16
  • Accepted : 2011.11.28
  • Published : 2011.11.30
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Abstract

The wakes of a cylindrical body have been investigated. The cylindrical body was attached with a thin film. The film is made of silicon with configurations of 50mm(W) ${\times}$ 150mm(L) ${\times}$ 0.3mm(T). The cylinder wakes have been measured with PIV experiments under the conditions with and without the thin film. The diameter of the installed cylinder body is 30mm and the Reynolds numbers are 2730, 6160 and 9750 with the diameter. The measurement system consists of an Ar-ion laser(6W), a high speed camera(1024 ${\times}$ 992 pixel, 500fps) and a host computer. FFT analyses have been carried out using the velocity vectors obtained by PIV measurements at the point X/D=1.52 and Z/D=0.52. For understanding the three-dimensional flow structures, a new Volumetric PTV(particle tracking velocimetry) has been constructed, in which the same four high-resolution cameras have been used. It has been verified that the flexible film suppresses or damps the vortices separated from the cylinder body, which makes the cylinder's wakes stable. With increase of Re numbers the intensity of the dominant frequency of the wakes become smaller.

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References

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