축대칭 몰수체의 유효반류 추정
Prediction of the Effective Wake of an Axisymmetric Body
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
An axisymmetric submerged body(L=5.6m, Diam=0.53m) is installed in Large Cavitation Tunnel (LCT) of KRISO and the nominal and total velocities without and with the propeller in operation, respectively, are measured using Laser Doppler Velocimeter (LDV). The flow field is nearly axisymmetric except the wake of the supporting strut, and is considered ideal to study the hydrodynamic interaction between the propeller and the oncoming axisymmetric sheared flow. The measured velocity data are then provided to compute the propeller-induced velocity to get the effective velocity, which is defined by subtracting the propeller-induced velocity from the total velocity. We adopted, in computing the induced velocity, two different methods including the vortex lattice method and the vortex tube actuator model to evaluate the resultant effective velocity distribution. To secure a fundamental base of experimental data necessary for the research on the effective wake, we measured the drag of the submerged body, the nominal and total velocity distributions at various axial locations for three different tunnel water speeds.
Abstract
An axisymmetric submerged body(L=5.6m, Diam=0.53m) is installed in Large Cavitation Tunnel (LCT) of KRISO and the nominal and total velocities without and with the propeller in operation, respectively, are measured using Laser Doppler Velocimeter (LDV). The flow field is nearly axisymmetric except the wake of the supporting strut, and is considered ideal to study the hydrodynamic interaction between the propeller and the oncoming axisymmetric sheared flow. The measured velocity data are then provided to compute the propeller-induced velocity to get the effective velocity, which is defined by subtracting the propeller-induced velocity from the total velocity. We adopted, in computing the induced velocity, two different methods including the vortex lattice method and the vortex tube actuator model to evaluate the resultant effective velocity distribution. To secure a fundamental base of experimental data necessary for the research on the effective wake, we measured the drag of the submerged body, the nominal and total velocity distributions at various axial locations for three different tunnel water speeds.
참고문헌 (9)
- Carlton, J.S., "Marine propellers and propulsion" (2007), Elsevier
- Hoekstra, M., "Prediction of full scale wake characteristics base on model wake survey", International Shipbuilding Progress, 22(250), pp.204~219 (1975)
- Huang, Thomas T., "Effective wake : Theory and experiment", Proceedings of the 13th Symposium on Naval Hydrodynamics, pp.651~673 (1980)
- ITTC Propeller Committee, "Proceedings of the 17th ITTC", 144~149 (1984)
- Kerwin, J. E., "Prediction of steady and unsteady marine propeller performance by numerical lifting-surface theory", Transactions Society of Naval Architects and Marine Engineers, 86, pp.1~30 (1987)
- Kim, K. S., "A characteristics of model ship wake generated at MOERI large cavitation tunnel using a model ship", Proceeding of the SNAK Conference, pp.2050~2056 (2010)
- Kim, K. S., "3 years after MOERI large cavitation tunnel completion", Bulletin of the Society of Naval Architects of Korea, 49(4) (2012)
- Lee, C. S., "Prediction of effective wake considering propeller-shear-flow interaction", Journal of the Society of Naval Architects of Korea, 27(2), pp.1~12 (1990)
- 백부근, "대형 캐비테이션 터널 내 선박 모형의 3차원 선체 반류 계측을 위한 레이저 유속계 개발", 대한조선학회 논문집, 54(6), pp.515~521 (2017), 대한조선학회[DOI]