Experimental investigation of frictional resistance reduction with air layer on the hull bottom of a ship
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In this article, reduction in the frictional resistance by air lubrication with air layers generated on the lower surface of a flat plate was investigated experimentally in the large water tunnel of SSMB.About:
This article is published in International Journal of Naval Architecture and Ocean Engineering.The article was published on 2014-06-01 and is currently open access. It has received 59 citations till now. The article focuses on the topics: Secondary air injection & Lubrication.read more
Citations
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Energy efficiency of integrated electric propulsion for ships – A review
TL;DR: In this article, the authors identify promising technologies and practices that are applicable to onboard energy systems of all-electric ships and also reveal energy efficiency sensitivity of allelectric ships to different applications, which should be eventually combined with alternative technology-based and operational-based measures as implemented on conventional propulsion ships in order to realize full potential for energy efficient operation.
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Power-saving device for air bubble generation using a hydrofoil to reduce ship drag: Theory, experiments, and application to ships
TL;DR: In this paper, the authors developed a new power-saving device to reduce the drag of a ship's hull using small bubbles, which reduced the energy required for bubble generation by using the low pressure region produced above the hydrofoil as the ship moves forward to drive atmospheric air into the water.
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A comprehensive review on countermeasures for CO2 emissions from ships
Hui Xing,Stephen Spence,Hua Chen +2 more
TL;DR: In this article, the authors present a comprehensive review to categorise the pathways and highlight the concepts, methodologies, characteristics, implementation barriers and future prospects of different abatement measures for carbon dioxide emissions in the maritime industry.
BookDOI
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
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An experimental comparison between different artificial air cavity designs for a planing hull
TL;DR: In this paper, the authors compare different cavity shapes, obtained by modifying a mother hull of a high-speed planing yacht, in order to stabilize an air-layer instead of the traditional air-cushion.
References
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Friction Drag Reduction of External Flows with Bubble and Gas Injection
TL;DR: In this article, the use of partial and supercavities for drag reduction of axisymmetric objects moving within a liquid is reviewed, and the current applications of these techniques to underwater vehicles and surface ships are discussed.
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Bubble-induced skin-friction drag reduction and the abrupt transition to air-layer drag reduction
TL;DR: In this article, a set of experiments has been conducted at the US Navy's William B. Morgan Large Cavitation Channel (LCC) to investigate the phenomena of skin-friction drag reduction in a turbulent boundary layer (TBL) at large scales and high Reynolds numbers.
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Ship hull drag reduction using bottom air injection
TL;DR: In this paper, the idea of bottom air injection to reduce ship hull resistance is not new, and early patents envisioned planing hull applications, such as catamarans and river barges.
Full Scale Experiment For Frictional Resistance Reduction Using Air Lubrication Method
C.L. Hoang,Y. Toda,Y. Sanada +2 more
TL;DR: In this article, a full scale experiment using air lubrication method to reduce the frictional resistance of a cement carrier Pacific Seagull was conducted from January to March, 2008.
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Optimization of energy saving device combined with a propeller using real-coded genetic algorithm
Tomohiro Ryu,Takashi Kanemaru,Shiro Kataoka,Kiyoshi Arihama,Akira Yoshitake,Daijiro Arakawa,Jun Ando +6 more
TL;DR: In this paper, a numerical optimization method to improve the performance of the propeller with Turbo-Ring using real-coded genetic algorithm is presented, in which Unimodal Normal Distribution Crossover (UNDX) and Minimal Generation Gap (MGG) model are used as crossover operator and generation-alternation model, respectively.