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

  • 제37권4호
  • /
  • Pages.359-366
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  • 2013
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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두 원기둥의 유동에 기인한 진동 특성에 관한 연구

Study on Characteristics of Flow-Induced Vibrations of Two Circular Cylinders

  • 김상일 (강원대학교 기계공학과) ;
  • 이승철 (강원대학교 소방방재공학전공)
  • Kim, Sang Il (Dept. of Mechanical Engineering, Kangwon Nat'l Univ.) ;
  • Lee, Seung Chul (Dept. of Fire Protection Engineering, Kangwon Nat'l Univ.)
  • 투고 : 2012.08.30
  • 심사 : 2012.12.11
  • 발행 : 2013.04.01
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초록

본 연구는 두 원기둥의 유동에 기인한 진동에 관한 실험적 연구이다. 두 원기둥이 직렬 배열(${\alpha}=0^{\circ}$), 대각선 배열(${\alpha}=5^{\circ}$, $10^{\circ}$, $15^{\circ}$, $25^{\circ}$, $45^{\circ}$, $60^{\circ}$), 병렬 배열(${\alpha}=90^{\circ}$) 됐을 때 두 원기둥의 간격(L/D)과 유속을 변화 시켰을 때의 진동 특성을 조사했다. 그 결과 다음과 같은 결과를 얻었다. (i)직렬, 대각선, 병렬 배열된 두 원기둥에서 발생하는 유동에 기인한 진동의 패턴은 7 개 패턴이다. (ii)복수로 존재하는 두 원기둥의 유동에 기인한 진동은 서로 진동을 유발시킨다. (iii) 두 원기둥의 직렬, 대각선, 병렬 배열 중에 유동에 기인한 진동을 유발하기 가장 쉬운 배열은 병렬 배열이다. (iv) 모든 배열에서 두 원기둥의 간격변화에 따른 최대 진폭의 변화는 변동 양력 계수의 변화와 유사하다.

This study aims to investigate the characteristics of the flow-induced vibrations of two circular cylinders. The characteristics of the flow-induced vibrations are examined for various flow velocities and spaces between the two cylinders when they are arranged in tandem, staggered, and side-by-side positions. The results are as follows: (i) Seven flow-induced vibration patterns are observed when the two circular cylinders are placed in either tandem, staggered, or side-by-side positions. (ii) The two cylinders induce a vibration because they affect each other. (iii) The easiest way to induce a vibration of the two cylinders is by placing them in the side-by-side position among the three arrangements (tandem, staggered, and side-by-side). (iv) The change in the maximum flow-induced vibration of the two cylinders depends strongly on the fluctuating lift forces of each of them.

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참고문헌

  1. Alam, M. M., Moriya, M. and Sakamoto, H., 2003, "Aerodynamic Characteristics of Two Side-by-side Circular Cylinders and Application of Wavelet Analysis on the Switching Phenomenon," Journal of Fluids and Structures, Vol. 18, pp. 325-346. https://doi.org/10.1016/j.jfluidstructs.2003.07.005
  2. Alam, M, M., Sakamoto, H and Zhou, Y., 2005, "Determination of Flow Configurations and Fluid Forces Acting on Two Staggered Circular Cylinders of Equal Diameter in Cross-flow," Journal of Fluids and Structures, Vol. 21, pp. 363-394. https://doi.org/10.1016/j.jfluidstructs.2005.07.009
  3. Owen, M, G and Steven, E, R., 1974, "The Vortex- Street Wakes of Vibrating Cylinders," Journal of Fluid Mechanics, Vol. 66, pp. 553-576. https://doi.org/10.1017/S002211207400036X
  4. Huseyin, A., Atakan, A. and Cuma, K., 2004, "Flow Characteristics of Circular Cylinders Arranged Sideby- side in Shallow Water," Journal of Flow Measurement and Instrumentation, Vol. 15, pp. 187-197. https://doi.org/10.1016/j.flowmeasinst.2004.04.003
  5. Tan, K., Sakamoto, H. and Moriya, M., 2002, "Suppression of Fluid Forces of a Circular Cylinder by Passive Control of Flow," Trans. of the JSME (B), Vol. 68, No. 674, pp. 2772-2779. https://doi.org/10.1299/kikaib.68.2772
  6. Lee, S., Lee, S. and Park, C., 2004, "Reducing the Drag on a Circular Cylinder by Upstream Installation of a Small Control Rod," Fluid Dynamics Research, Vol. 34, pp. 233-250. https://doi.org/10.1016/j.fluiddyn.2004.01.001
  7. Kim, S., Lee, S., 2012, "Suppression of Flow-induced Vibration of a Circular Cylinder by Means of a Flexible Sheet," Journal of Mechanical Science and Technology, Vol. 26, No. 6, pp. 1773-1779. https://doi.org/10.1007/s12206-012-0419-2
  8. Lam, K. M. and To, A. P., 2003, "Interference Effect of and Upstream Larger Cylinder in the Lock-in Vibration of a Flexibly Mounted Circular Cylinder," Journal of Fluids and Structures, Vol. 17, pp. 1059-1078. https://doi.org/10.1016/S0889-9746(03)00065-3
  9. Zhou, Y., Wang, Z. J., So, M. C. and Jin, W., 2001, "Free Vibrations of Two Side-by-side Cylinders in a Cross Flow," Journal of Fluid Mechanics, Vol. 443, pp. 197-229.
  10. Brika, D. and Laneville, A., 1997, "Vortex-induced Oscillations of Two Flexible Circular Cylinders Coupled Mechanically," Journal of Wind Engineering and Industrial Aerodynamics, Vol. 69, No. 71, pp. 61-70.
  11. Alam, M. M., Moriya, M., Takai, K. and Sakamoto, H., 2003, "Fluctuating Fluid Forces Acting on Two Circular Cylinders in a Tandem Arrangement at a Subcritical Reynolds Number," Journal of Wind Engineering and Industrial Aerodynamics, Vol. 91, pp. 139-154. https://doi.org/10.1016/S0167-6105(02)00341-0
  12. Alam, M. M., Sakamoto, H. and Moriya, M., 2003, "Reduction of Fluid Forces Acting on a Single Cylinder and Two Circular Cylinders by Using Tripping Rods," Journal of Fluids and Structures, Vol. 18, pp. 347-366. https://doi.org/10.1016/j.jfluidstructs.2003.07.011