Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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Characteristics of Fluid Force Reduction of a Square Prism With a Small Triangular Prism

작은 삼각주에 의한 정방형주의 유체력 저감특성

  • Ro, Ki-Deok (Department of Mechanical System Engineering.Institute of Agriculture & Life Science, Gyeongsang Nationak University)
  • Received : 2014.09.19
  • Accepted : 2014.11.27
  • Published : 2015.03.31
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Abstract

The characteristics of the fluid force reduction of a square prism having a small triangular prism at the upstream side was investigated by measuring of lift and drag on the square prism The experimental parameters were the width ratios (H/B=0.2~0.6) of triangular prisms to the prism width and the gap ratios (G/B=0~3) between the square prism and the triangular prism. The drag reduction rate of the square prism was increased and then decreased with G/B in case of the same H/B, and was increased with H/B in case of the same G/B. The maximum drag reduction rate was represented by 78.5% at H/B=0.6 and G/B=1.5. The lift reduction rate of the square prism was hardly not affected by the width and gaps ratios, the average value was about 52.4%.

본 연구는 상류측에 작은 삼각주를 가진 정방형주의 유체력 저감 특성을 양 항력 측정 실험으로 파악한 것이다. 실험파라메터는 정방형주 한 변의 길이에 대한 삼각주의 폭비(H/B=0.2~0.6) 및 정방형주 전면에서부터 삼각주까지의 거리 (G/B=0~3) 로 했다. 삼각주의 폭비를 고정시킨 경우 정방형주의 항력감소율은 간격비가 증가할수록 증가하다 감소하는 특성을 보였다. 또한 같은 간격비에서는 삼각주의 폭비가 클수록 정방형주의 항력감소율이 증가했으며, 폭비 H/B=0.6, 간격비 G/B=1.5일 때 최대 78.5%의 항력감소율을 보였다. 정방형주의 양력감소율은 수직평판의 폭비 및 간격비에 거의 영향을 받지 않았으며, 양력감소율의 평균치는 52.4% 정도였다.

Keywords

References

  1. B. Khalighi, S. Zang, C. Koromilas, S. R. Balkanyi, and Luis P. Bernal, "Experimental and computational study of unsteady wake flow behind a bluff body with a drag reduction device," Society of Automotive Engineers, 2001-01B-207, pp. 1-15, 2001.
  2. T. Tamura and T. Miyagi, "The effect of turbulence on aerodynamic forces on a square cylinder with various corner shapes," Journal of Wind Engineering and Industrial Aerodynamics, vol. 83, no. 1-3, pp. 135-145, 1999. https://doi.org/10.1016/S0167-6105(99)00067-7
  3. K. D. Ro, K. S. Kim, "Fluid force reduction characteristics of a square prism having fences on the corner," Journal of the Korean Society of Marine Engineering, vol. 30, no. 3, pp. 389-395, 2006 (in Korean).
  4. K. D. Ro, K. S. Kim, and S. K. Oh, "The visualization of the flowfield around square prism having fences using the PIV," Journal of the Korean Society of Marine Engineering, vol. 32, no. 1, pp. 94-99, 2008. https://doi.org/10.5916/jkosme.2008.32.1.94
  5. W. C. Park, "Effect of the length of a splitter plate on drag reduction," Transactions of the Korean Society of Mechanical Engineers B, vol. 17, no. 11, pp. 2809-2815, 1993 (in Korean).
  6. Con J. Doolan, "Flat-plate interaction with the near wake of a square cylinder," Journal of the American Institute of Aeronautics and Astronautics, vol. 47, no. 2 pp. 475-478, 2009. https://doi.org/10.2514/1.40503
  7. K. D. Ro, S. M. Yoon, D. H. Choi, J. H. Kim, and E. C. Sim, "Drag reduction on a square prism using a detached splitter plate," Journal of the Korean Society of Marine Engineering, vol. 36, no. 6, pp. 808-813, 2012 (in Korean). https://doi.org/10.5916/jkosme.2012.36.6.808
  8. K. D. Ro, "Characteristic calculation of flowfield around a square prism having a detached splitter plate using vortex method," Journal of the Korean Society of Marine Engineering, vol. 37, no. 2, pp. 156-162, 2013. https://doi.org/10.5916/jkosme.2013.37.2.156
  9. T. Igarashi, "Drag reduction of a square prism by flow control using a small rod," Journal of Wind Engineering and Industrial Aerodynamics, vol. 69, no. 71, pp. 141-153, 1997.
  10. H. Sakamoto, K. Tan, N. Takeuchi, and H. Haniu, "Suppression of fluid forces actiong on a square prism by passive control," Journal of Fluids Engineering, vol. 119, pp. 506-511, 1997. https://doi.org/10.1115/1.2819273
  11. K. D. Ro, D. B. Jo, Y. J Yoon, and S. J. Park, "Experiments of flowfield of a square prism having a small vertical plate," Journal of the Korean Society of Marine Engineering, vol. 38, no. 6, pp. 900-908, 2014 (in Korean). https://doi.org/10.5916/jkosme.2014.38.7.900