An experimental investigation of interceptors for a high speed hull

Avcı, Ahmet; Barlas, Barış

doi:10.1016/j.ijnaoe.2018.05.001

Cited by 38 publications

(22 citation statements)

References 7 publications

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“…Decreasing ship resistance could be done in various ways, such as decreasing wave resistance or friction resistance by using stern flaps [4], and/or using hydrofoils that can raise the hull above the surface of the water, thus reducing resistance and increasing efficiency more than designing hulls [5]. There is also a lift interceptor, like hydrofoil, but with a different concept [6], Called vortex and the use of thick foil under the transom hull. Van Oossanen invented this technology and it was named Hull Vane.…”

Section: Introductionmentioning

confidence: 99%

Study on the Resistance Reduction on High-Speed Vessel by Application of Stern Foil Using CFD Simulation

Budiyanto

Murdianto

Syahrudin

2020

CFDL

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Stern foil is an innovation that can be used on high-speed vessel craft. This innovation uses the same principles as interceptor but using hydrofoil. Interceptor are used to reduce the wetted surface area of the transom by making vortex under the transom, this kind of change will increase speed and reduce the total resistance of the ship. The mechanism on how the stern foil reduces the total resistance is an interesting question in term of ship hydrodynamics. This study aims to analyse the resistance reduction on high-speed patrol vessel by application of stern foil using simulation model. The study was carried out using computational fluid dynamics (CFD) with hydrodynamic parameters using a variation of the angle of attack 3˚ and 0˚ on Froude number range 0.6-1.3 with service load at 2 kg. The simulation result was obtained the optimal work for stern foil is at service load (2 kg) is a reduction in the total resistance of about 26,70% with the angle of attack is 0˚ in Froude number 0.9.

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Section: Introductionmentioning

confidence: 99%

Study on the Resistance Reduction on High-Speed Vessel by Application of Stern Foil Using CFD Simulation

Budiyanto

Murdianto

Syahrudin

2020

CFDL

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“…Such motions will work directly to increase the total resistance and fuel consumption of the ship. With the aim of optimising the hydrodynamics and increasing the efficiency of ships, the use of energy-saving technologies has tended to become highly developed (Avci & Barlas, 2019;Huang & Yang, 2016;Zhang, Zhu, & Leng, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…One of the keys to optimising hull design is to minimise resistance by optimising the hull shape (Budiyanto, Novri, Alhamid, & Ardiyansyah, 2019;Campana et al, 2018;Diez, Serani, & Campana, 2017), reducing wave making or wave resistance by using stern flaps (Song, Guo, Gong, Li, & Wang, 2018) and/or applying hydrofoils, which lift the hull above the water's surface and produce higher efficiency compared with a planing hull (Vellinga, 2009). Similar to a hydrofoil, there are interceptors, which cause vortices below the transom area and produce lift (Avci & Barlas, 2019). There is also a submerged hydrofoil that is attached below the hull transom, called a Hull Vane®.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the effectiveness of a stern foil on a patrol boat by experiment and simulation

2020

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In the marine industry, specifically fast patrol boats, the important objectives are reducing resistance and improving the efficiency of ships' propulsion systems. The aim of this research was to investigate the application of a stern foil on a patrol boat through experimental and simulation methods. The stern foil used to generate a lift force was an asymmetrical National Advisory Committee for Aeronautics (NACA) foil. In the experiment, the stern foil was installed below the transom of a ship model and positioned parallel to the keel direction (3°towards x-axis). This position created a resultant force, which had an angle to the x-axis. There were variables in this experiment, such as the stern foil application, Froude number (Fr) and hull loads. Those combinations of variables generated sufficient data to analyse the effect of the stern foil working in various conditions. At an optimal load condition (half full load, 2 kg) and Fr 1.1 in the experiment and simulation, the ship model had a resistance reduction of as much as 22.3% and 23.3% in stern foil applications. In addition, with different setups of the stern foil (0°towards the x-axis) in the simulation, a resistance reduction of about 26.7% occurred at Fr 0.9.

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“…In the past few years, several researchers have numerical and experimental investigations to evaluate the trim-tabs or interceptor on the pitch angle/trim performances of the high-speed craft. Avci and Barlas [2] conducted the experimental model test of three transverse locations of interceptors with six different deployment depths; they found that the trim angle reduced between 1.60 o and 4.70 o at Froude number within the range of 0.58 ≤ Fr ≤ 1.19. Ghassemi et al, [3] developed numerical method to find the optimum geometrical interceptor; the result revealed that the pressure variations have an effect on draft height and lifting forces which directly results in a better control of trim.…”

Section: Introductionmentioning

confidence: 99%

Computational Investigation of Pitch Motion of a High-Speed Craft Incorporated with Trim-Tabs

Fitriadhy

Pheng²,

Adzkh³

et al. 2022

CFDL

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An excessive trim by stern on a high-speed craft is vulnerable to decrease comfortable ride incorporated with the large pitch motion. To prevent such problem, the craft is then equipped with a device known as “trim-tabs” providing a lift force at the stern region, which leads to reduce pitch angle/trim of the craft. This paper presents computational modelling of trim-tabs on high-speed craft towards reducing the pitch motion in the calm water condition. Here, the commercial Computational Fluid Dynamic (CFD) software; called Numeca Fine Marine has been accordingly utilised to evaluate several effects of Froude numbers (Fr) and angle of the trim-tabs into characteristics of the lift force of the high-speed craft. The results revealed that the pitch motion of the high-speed craft equipped with the trim-tabs (5o) has significantly reduced up to 76% at Fr = 1.0. This can be explained that the installed trim-tabs has increased the negative trim moment, which inherently creates the restoring moment pushing the stern up along the pitch-axis. Meanwhile, this may cause involuntary the total ship’s resistance increased. In general, this simulation pointed out the advantage of the trim-tabs to increase the comfortability of the high-speed craft.

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An experimental investigation of interceptors for a high speed hull

Cited by 38 publications

References 7 publications

Study on the Resistance Reduction on High-Speed Vessel by Application of Stern Foil Using CFD Simulation

Study on the Resistance Reduction on High-Speed Vessel by Application of Stern Foil Using CFD Simulation

Investigation of the effectiveness of a stern foil on a patrol boat by experiment and simulation

Computational Investigation of Pitch Motion of a High-Speed Craft Incorporated with Trim-Tabs

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