An experimental study of interceptor’s effectiveness on hydrodynamic performance of high-speed planing crafts
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In this paper, the impact of interceptors on planing craft hydrodynamic quality is investigated through application of an experimental method and two scaled-down models of high-speed planing mono-hull and catamaran are tested with and without interceptors in calm water at different heights of the interceptors to investigate the effect of interceptor on drag reduction of the models.Abstract:
Trim control mechanisms such as interceptors and trim flaps have been widely used in recent years in highspeed crafts for ride and trim control. In spite of their extensive application, a few studies investigating the impact of interceptors on planing craft performance, have been published. In the present study, the impact of interceptors on planing crafts hydrodynamic quality is investigated through application of an experimental method. Two scaled-down models of high-speed planing mono-hull and catamaran are tested with and without interceptors in calm water at different heights of the interceptors to investigate the effect of interceptors on drag reduction of the models. The first one is a scaled-down model of 11 m planing mono-hull boat and the test was conducted at the towing tank of Sharif University of Technology, Iran. The second one is a scaled-down model of 18 m planing catamaran boat and the test was conducted at the towing tank of Krylov Shipbuilding Research Institute (KSRI), Russia. The experimental results show a remarkable drag reduction of up to 15% for mono-hull model and up to 12% for catamaran model over the wide speed range of the models.read more
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Progress in Maritime Technology and Engineering : Proceedings of the 4th International Conference on Maritime Technology and Engineering (MARTECH 2018), May 7-9, 2018, Lisbon, Portugal
Abstract: The State of Bahia has one of the largest port complexes in Brazil, that consists of public ports and private use terminals. One of which is specialized with a cargo carrying capacity of about 530 thousand TEUs (Twenty-foot Equivalent Unit) per year. On the other hand, the container terminal at the port of Genoa, Italy, has a similar capacity but has been performing better than the Brazilian one. The present study evaluates the differences and similarities between these ports, in the context of engineering, environmental sustainability and some topics of the port regulatory framework that can influence productivity. Based on the arrival and service rates of the ships and their respective probability distributions, a mathematical model of queuing theory was developed that indicates the port occupation rate, the time and the average number of ships in the queue, in a process with which one can assess the environmental impact of these terminals. (naval-port infrastructure and queuing theory) and in environmental sustainability, as well as in some points of the regulatory framework and logistical infrastructure of both countries that can influence and reveal the competitiveness of these ports. Based on vessel arrival and service rates and their consequent probability distributions, in addition to other constraints, the queuing model reveals the time and average number of ships in process, the port occupation rate, and the expected probability of this finding variable, may provide a possibility of fine payments for delay in services, thus serving as the efficiency indicators of port operation. The results obtained here, and their interpretations, are limited to the time of their respective data collection, as well as to the reliability of information that was possible to obtain at the time of the technical visits and professional meetings held. They are also limited to the consultations made to the electronic pages of the terminals and institutions that control local port operations. The present work is in the context of other researches already carried out. Camelo et al. (2010), used queuing theory to simulate the behavior of the row of iron ore vessels in the port of Ponta da Madeira, Brazil, with the aid of the Arena® software and found high berth occupation rates, recommending investments in the expansion of its capacity to meet the expectations of growing demand for ores in the world market. In this same direction, Schoreder (2014) simulated the operational behavior of the container terminal at the port of Durban, South Africa, based on the operation of the queue system of the container terminal at the port of Rotterdam from the logic of model construction simulated
Journal ArticleDOI
Influence of interceptors, stern flaps, and their combinations on the hydrodynamic performance of a deep-vee ship
TL;DR: In this article, a study of the hydrodynamic performance of a deep-vee ship was performed to determine the influence of the use of stern flaps and interceptors on drag-resistance, trim, and sinkage properties of the said ship.
Journal ArticleDOI
Experimental Study of the Wedge Effects on the Performance of a Hard-chine Planing Craft in Calm Water
TL;DR: In this article, the effects of a wedge on the performance of planing craft in calm water are experimentally investigated, and it is concluded that, when the wedge is applied to the hull, the risk of model exhibiting instability diminishes, while total trim angle largely decreases, keel wetted length is enlarged, wetted surface becomes thinner, CG rise up is lowered, and the resistance is reduced.
Journal ArticleDOI
An experimental study on vertical motion control of a high-speed planing vessel using a controllable interceptor in waves
Jong-Yong Park,hujae choi,Jooho Lee,Hwiyong Choi,Joohyun Woo,Seon-Hong Kim,Dong Jin Kim,Sun Young Kim,Nakwan Kim +8 more
TL;DR: This paper aims to construct an active control system using an interceptor and to verify the performance through towing tests to improve seakeeping performance of a high-speed planing vessel.
Journal ArticleDOI
Experimental and numerical analyses of wedge effects on the rooster tail and porpoising phenomenon of a high-speed planing craft in calm water:
TL;DR: In this paper, the authors present experimental and numerical investigation of stability and rooster tail of a mono-hull high-speed planing craft with a constant deadrise angle.
References
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Book
Boundary layer theory
TL;DR: The flow laws of the actual flows at high Reynolds numbers differ considerably from those of the laminar flows treated in the preceding part, denoted as turbulence as discussed by the authors, and the actual flow is very different from that of the Poiseuille flow.
Journal ArticleDOI
Boundary-Layer Theory (Seventh Edition)
Procedures for hydrodynamic evaluation of planing hulls in smooth and rough water
D Savitsky,P W Brown +1 more
TL;DR: In this article, the authors consolidate these results in a form suitable for design purposes and illustrate their application in predicting planing performance in smooth and rough water, including the effect of bottom warp on planing efficiency, influence of reentrant transom forms, and seakeeping of planing hulls.
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