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논문 상세정보


A jet stream applied tangential to a curved surface in fluid increases lift force by strengthening circulation around the surface and this phenomenon is known as the Coanda effect. Many experimental and numerical studies have been performed on the Coanda effect and the results found to be useful in various fields of aerodynamics. Recently, preliminary studies on Coanda control surface are in progress to look for practical application in marine hydrodynamics since various control surfaces are used to control behaviors of ships and offshore structures. In the present study, the performance of a Coanda control surface with different geometries of the jet injection nozzle was surveyed to assess applicability to ship rudders. A numerical simulation was carried out to study flow characteristics around a section of a horn type rudder subjected to a tangential jet stream. The RANS equations, discretized by a cell-centered finite volume method were used for this computation after verification by comparing to the experimental data available. Special attentions have been given to the sensitivity of the lift performance of a Coanda rudder to the location of the slit (outlet) and intake of the gap between the horn and rudder surface at the various angles of attack. It is found that the location of the water intake is important in enhancing the lift because the gap functions as a conduit of nozzle generating a jet sheet on the rudder surface.

참고문헌 (18)

  1. Ahn, H.-S., Kim, H., 1999, Experimental Study on the Effects of Water Jetting on a Flapped Rudder, J. of SNAK, 36, 1, pp.22-29 
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  5. Seo, D, W., Jeong, S,-W., Lee, S,-H., 2007, Influence of Tail Blades on the Performance of a Fin, J. of SNAK, 44, 2, pp 55-63 
  6. Seok-Jin Hong and Seung-Hee Lee, 2004, A Study on the Flow Characteristics around a Conada Control Surface, SOTECH, 8, 2,pp13-19 
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  8. Kamei,O. and Setoguchi, T., 2005, A Study on the Spiral Flow by a Coanda Nozzle, Master's Thesis, Sega University, Japan 
  9. Ahn, H,-S., Kim, H., 2003, An Experimental Study of Coanda Effect on the Flapped Control Surfaces, J. of SNAK, 40, 5, pp.10-16 
  10. Lee, D, W., Lee, S., Kim, B, J., Kwon, S, B., 2007, A Study on Jet Characteristic using a Coanda Effect in a Constant Expansion Rate Nozzle, J. of KSAS, 35, 8, pp. 706-713 
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  12. Matsuo, S., Lee, K. H.,Oda, S., Setoguchi, T. and Kim. D., 2003, Effect of Annular Slit Geometry on Characteristics of Spiral Jet, J. of Thermal Science, 12, 3, pp. 225-230 
  13. Horii, K., Ohsumi, K., Matsma, e Y., Cheng, X. M., Tae, M. Yasukawa, E. and Hashimoto, B., 1991, A Conada Spiral Device Passing Optical Cords with Mechanical Connectors Attached Through a Pipeline, ASME Gas-Solid Flow, FED, 121, pp. 65-70 
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  15. Englar, R, J., 1971, Two-dimensional subsonic wind tunnel tests of two 15-percent thick circulation control airfoils, David Taylor Naval Ship Research and Development Center, technical note AL-211 
  16. Horri, K., Matsumae, Y., Cheng, X., M., Takei, M., Yasukawa, E. and Hashimoto, B., 1991, Focusing Phenomenon and Stability of Spiral-Flow jet, Tans. Jpn. Soc. Aeronautical and Space Science, 33, 102, pp 141-153 
  17. Menter, F.R., 1994, Two-equation eddy-viscosity turbulence models for engineering applications , J. of AIAA, 32, 8, pp. 1598-1605 
  18. S.H. Rhee, S.-E. Kim, H. Ahn, J. Oh, H. Kim, 2003, Analysis of a jet-controlled high-lift hydrofoil with a flap, J. of Ocean engineering, pp. 2117-2136 

이 논문을 인용한 문헌 (1)

  1. Seo, Dae-Won ; Oh, Jung-Keun ; Lee, Seung-Hee 2010. "A Study for Improvement of Lift Performance of a Horn-type Rudder with the Coanda Effect" 大韓造船學會 論文集 = Journal of the Society of Naval Architects of Korea, 47(4): 543~552 


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