A numerical and experimental study on the drag of a cavitating underwater vehicle in cavitation tunnel
2
조회
0
다운로드
4
인용
0
참고문헌
키워드
초록
For Super-Cavitating Underwater Vehicles (SCUV), the numerical analyses and experiments in a large cavitation tunnel are carried out at relatively large Reynolds numbers. The numerical results agree well with experiments and the drag coefficient of SCUV is rarely changed by the Reynolds number. As the cavitation number is decreased, the cavity occurs and grows, the cavitator drag decreases and the body drag is affected by the degree of covering the body with the cavity. The tunnel effects, i.e. the blockage and the friction pressure drop of the tunnel, on the drag and the cavitation of SCUV are examined from the numerical results in between the tunnel and unbounded flows. In the tunnel, a minimum cavitation number exists and the drag of SCUV appears larger than that in unbounded flow. When the super-cavity covers the entire body, the friction drag almost disappears and the total drag of SCUV can be regarded as the pressure drag of cavitator.
Abstract
For Super-Cavitating Underwater Vehicles (SCUV), the numerical analyses and experiments in a large cavitation tunnel are carried out at relatively large Reynolds numbers. The numerical results agree well with experiments and the drag coefficient of SCUV is rarely changed by the Reynolds number. As the cavitation number is decreased, the cavity occurs and grows, the cavitator drag decreases and the body drag is affected by the degree of covering the body with the cavity. The tunnel effects, i.e. the blockage and the friction pressure drop of the tunnel, on the drag and the cavitation of SCUV are examined from the numerical results in between the tunnel and unbounded flows. In the tunnel, a minimum cavitation number exists and the drag of SCUV appears larger than that in unbounded flow. When the super-cavity covers the entire body, the friction drag almost disappears and the total drag of SCUV can be regarded as the pressure drag of cavitator.
참고문헌 (19)
- 안병권, "Experimental and numerical studies on super-cavitating flow of axisymmetric cavitators", International Journal of Naval Architecture and Ocean Engineering, 2(1), pp.39~44 (2010), 대한조선학회
- 안병권, "Experimental investigation of supercavitating flows", International Journal of Naval Architecture and Ocean Engineering, 4(2), pp.123~131 (2012), 대한조선학회[DOI]
- ANSYS, "Fluent theory guide" (2010), ANSYS Inc
- Birkhoff, G., "Wall effects in cavity flow", Quarterly of applied mathematics, 8(2), pp.151~168 (1950)
- Brennen, C., "A numerical solution of axisymmetric cavity flows", Journal of Fluid Mechanics, 37(4), pp.671~688 (1969)
- 최정규, "고 레이놀즈수 유동의 수치해석시 벽함수 사용에 관한 연구", 대한조선학회 논문집, 47(5), pp.647~655 (2010), 대한조선학회
- Epshtein, L. A., "Minimal cavitation number and cavity width in plane and axisymmetric channels", Fluid Dynamics, 1(5), pp.54~56 (1966)
- Karlikov, V. P., "Method of approximate account for the wall effect in cavitation flow around bodies in water tunnels", Fluid Dynamics, 1(4), pp.89~93 (1966)
- Kirschner, I. N., "Results of selected experiments involving supercavitating flows", RTO AVT Lecture Series on Supercavitating Flows, von Karman Institute in Brussels, Belgium, pp.15-1~15-4 (2001)
- Knapp, R. T., "Cavitation" (1970), McGraw-Hill
- 이현배, "2차원 단순 물체의 초공동 유동에 대한 수치해석", 대한조선학회 논문집, 50(6), pp.436~449 (2013), 대한조선학회
- A theory of the blockage effects on bluff bodies and stalled wing in a closed wind tunnel. Aeronautical research council Reports and Memoranda, "Maskell, E. C.", Her Majesty’s stationery office, ~ (1963)
- 이신형, "전산유체역학을 위한 공동모델의 특성 조사", 대한조선학회 논문집, 47(5), pp.657~669 (2010), 대한조선학회
- 박선호, "2차원 및 축대칭 운동체 주위의 초공동 현상에 대한 수치해석", 한국전산유체공학회지, 16(1), pp.14~21 (2011), 한국전산유체공학회
- 박선호, "3차원 비틀어진 날개 주위의 비정상 공동 유동에 대한 수치적 연구", 한국전산유체공학회지, 16(3), pp.37~46 (2011), 한국전산유체공학회
- Rouse, H., "Cavitation and pressure distribution head forms at zero angle of yaw. Studies in Engineering Bulletin", State university of Iowa, 32, pp.1~70 (1948)
- Schlichting, H., "Boundary layer theory. 7 ed" (1979), McGraw-Hill
- Steady-state cavity studies in a free-jet water tunnel, "Self, M. W.", St. Anthony Falls Hydraulic Laboratory, University of Minnesota, ~ (1955)
- Ch. Suryanarayana, "Cavitation studies on axi-symmetric underwater body with pumpjet propulsor in cavitation tunnel", International Journal of Naval Architecture and Ocean Engineering, 2(4), pp.185~194 (2010), 대한조선학회