Experimental Study of the hydrodynamic effect of angel change on stern by wedge in high speed boat of mono hull

Document Type : Original Article

Authors

1 Professor, School of Marine Engineering, Department of Hydromechanical Engineering and Drift Systems

2 Imam Hossein (as) Uni. TEH. IRAN

3 Master of Marine Engineering, Amirkabir University of Technology, Faculty of Marine Engineering

Abstract

High speed craft is one of the most sophisticated marine vehicles. Stability and speed are two important factors in the construction of planing hulls. The attractiveness and complexity of this type of vessel has led many researchers to work in this field. In the current paper, the effect of wedge on the stability and resistance of a mono-hull high speed craft is experimentally investigated. The studied vessel has a constant deadrise angle and the length to width ratio is 4.8. The tests were conducted at transverse Froude numbers of 0.1 - 4.26 at the National Iranian Marine Laboratory. The measured parameters are trim, rise up, resistance and the wetted length of chine and keel. The vessel at the speed of 8 m/s was unstable. To stabilize the vessel, a wedge with a height of 5 mm and a length of 92 mm has been used. In this case, in addition to the absence of porpoing, the resistance of the vessel, decreases.

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References

[1] Von Karman, T. H., “The impact on seaplane floats during landing,” 1929.
[2] Milwitzky, B., “A generalized theoretical and experimental investigation of the motions and hydrodynamic loads experienced by V-bottom seaplanes during step-landing impacts,” 1948.
[3] Schnitzer, E., “Theory and procedure for determining loads and motions in chineimmersed hydrodynamic impacts of prismatic bodies (No. NACA-TN-2813),” NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON DC, 1952.
[4] Ghadimi P, Tavakoli T, Dashtimanesh A, An analytical procedure for time domain simulation of roll motion of the warped planing hulls, Inst. Mech. Eng. Part M: J. Eng. Marit. Environ. (2015), http://dx.doi.org/10.1177/1475090215613536, Published Online: Nov. 2015.
[5] Ghadimi P, Tavakoli S, Dashtimanesh A, Coupled heave and pitch motions of planing hulls at non-zero heel angle, Applied Ocean Research 59 (2016) 286–303.
[6] Ghadimi P, Tavakoli S, Dashtimanesh A, Zamanian P (2017).  Steady performance prediction of a heeled planing boat in calm water using asymmetric 2D+ T model, Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment, 231, 234-257.
[7] P. Ghadimi, S. Tavakoli, M. A. Feizi Chekab, A. Dashtimanesh. INTRODUCING A PARTICULAR MATHEMATICALMODEL FOR PREDICTING THE RESISTANCE AND PERFORMANCE OF PRISMATIC PLANING HULLS IN CALM WATER BY MEANS OF TOTAL PRESSURE DISTRIBUTION. Journal of Naval Architecture and Marine Engineering, 12(2015) 73-94.
[8] Ghadimi P, Tavakoli S, Dashtimanesh A. (2016), Calm water performance of hard-chine vessels in semi-planing and planing regimes. Polish Maritime Res, 23(4), 23-45.
[9] Svahn D, 2009. Performance prediction of hulls with transverse steps. MSc Thesis, KTH, Stockholm.
[10] Danielson, J., and Stromquist, J., “Conceptual design of super yacht tender,” Marine System Center for Naval Architecture, KTH University, 2012.
[11] Wang CT (1980) Wedge effect on planing hulls, Journal of Hydronautics, 14(4): 122-124.
[12] Lee E, Pavkov M, Mccue-Weil W. 2014. The Systematic variation of step configuration and displacement for a double-step planing craft. Journal of Ship Production and Design. 30(2): 89–97.
[13] FALTINSEN, O. M. 2005 Hydrodynamics of High-Speed Marine Vehicles, Cambridge University Press, Cambridge University Press, New York, New York.
[14] Clement EP. 2003. A configuration for a stepped planing boat having minimum drag. Bethesda (MD): David Taylor Model Basin, US Naval Surface Warfare Center.
[15] Agostino De Marco, Simone Mancini, Salvatore Miranda, Raffaele Scognamiglio, Luigi Vitiello. Experimental and numerical hydrodynamic analysis of a stepped planing hull. Applied Ocean Research 64 (2017) 135–154.
[16] A. Sverchkov, Application of air cavities on high-speed ships in Russia, in:International Conference on Ship Drag Reduction (SMOOTH-Ships), Istanbul,2010.
[17] Karafiath, G. and S.C. Fisher, ’The effect of Stern Wedges on Ship Powering Performance’, Naval Engineers Journal, May, 1987.
[18] Millward A (1987) Effect of wedges on the performance characteristics of two planing hulls, Journal of Ship Research, 20(4): 224-232.
[19] Savitsky D, Brown PW (1976) Procedures for hydrodynamic evaluation of planning hulls in smooth and rough water. Marine technology, 13(4): 381-400.
[20] D. Savitsky, Hydrodynamic design of planing hulls, Mar. Technol. 1 (1964)71–95.
[21] Cumming D, Pallard R, Thornhill E, Hally D, Dervin M (2006) hydrodynamic design of a stern flap appendage for the HALIFAX class frigates, MARI-TECH 2006, Halifax, N.S June 14 – 16.
[22] Jang SH, Lee HJ, Joo YR, Kim JJ, Chun HH (2009) Some practical design aspects of appendages for passenger vessels, International journal of Naval Architecture and Ocean Engineering, 1: 50-56.
[23] Tsai, J., Hwang, J., Chou, S., 2003. Study on the compound effects of interceptor with stern flap for two fast Monohulls with transom stern. In: Proceedings of the Seventh International Conference on Fast Sea Transportation, FAST 2003, Session D1, 23–28, Ischia, Italy.
[24] Stefano Brizzolara. HYDRODYNAMIC ANALYSIS OF INTERCEPTORS WITH CFD METHODS. 7th Int. Conference on Fast Sea Transportation - FAST 2003 – Ischia, Italy.
[25] A.A.K. Rijkens, J.A. Keuning and R.H.M. Huijsmans. A computational tool for the design of ride control systems for fast planing vessels. International Shipbuilding Progress 58 (2011) 165–190.
[26] Karimi MH, Seif MS, Abbaspoor M (2013) An experimental study of interceptor’s effectiveness on hydrodynamic performance of high-speed planing crafts, Polish Maritime Research, 20: 21-29.
[27] MANSOORI M, FERNANDES A. C, Hydrodynamics of the interceptor on a 2-D flat plate by CFD and experiments, journal of hydrodynamics, 2015,27(6):919-933.

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