Interceptor and trim tab combination to prevent interceptor's unfit effects

Mansoori, M.; Fernandes, Antonio Carlos

doi:10.1016/j.oceaneng.2017.02.024

Cited by 32 publications

(23 citation statements)

References 16 publications

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“…The height of the interceptor is an important factor as pointed out by Ghassemi et al [8], and it has a close relationship with speed. This conclusion is confirmed by Mansoori et al [9][10][11]; however, in Mansoori's investigation, the length of the hull and the thickness of the boundary layer should be taken into account. To get a better design of the interceptor for the trim optimization and minimum resistance of the planning boat, Mansoori et al investigated the major geometric parameters (height and width) of interceptors.…”

Section: Introductionmentioning

confidence: 55%

“…Ghassemi et al [8] conducted a model test on a yacht with the interceptor, finding that high pressure is induced in the region between the interceptor and the bottom, and the wetted surface and resistance is reduced by the interceptor. In 2017, Mansoori et al [9][10][11] investigated the flow field around the interceptor in the conditions of different heights by model tests and CFD and found that a remarkable pressure gradient is induced by the interceptor and the resistance of the hull is therefore reduced. The investigation of Guo et al [12] demonstrated that the wake flow and navigation attitude of the hull is changed by the interceptor, and the wave resistance and the wetted surface, as well as the frictional resistance, is reduced.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the Lift Force Induced by the Interceptor and Its Affecting Factors: Experimental Study with Captive Model

Rui

Zhang

Luo

et al. 2022

JMSE

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An interceptor is an appendage widely used for high-speed planing boats to reduce resistance and modify hull attitude by the lift force-induced, but the relationship between the induced lift force and the factors affecting it are still not clear, especially for the vessels other than the planing hull. In this paper, a model test of a series of models is performed to investigate the lift force induced by an interceptor and the influence of the affecting factors systematically. The lift forces induced by the interceptor are tested in the conditions of different velocities, interceptor heights, angles, and drafts in the towing tank. The effects of each factor and the coupled effects are analyzed. It is found by the experimental results that the lift coefficient of the induce lift force in the present investigation is approximately proportional to the square of the non-dimensional velocity and interceptor height, but the effect of the interceptor height is of a limited extent. The influence of angle and draft on the lift force induced by the interceptor cannot be ignored in the present study. The induced lift force is decreased when the angle of the plate is reduced and is enhanced when the draft is increased.

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Section: Introductionmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Investigation on the Lift Force Induced by the Interceptor and Its Affecting Factors: Experimental Study with Captive Model

Rui

Zhang

Luo

et al. 2022

JMSE

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“…Correspondingly, this high-speed craft has a certain possibility to suffer serious pitching motion, severe slamming and dynamic instabilities due to high impact wave-loads. To resolve this problem, a trim-tabs model is then introduced, which connects to the end of the craft to control the trim by adjusting the angle of tab, relative to the larger surface, have been used to optimize the running trim of displacement, semiplanning, and planning vessels [1]. Geometrically, the trim tab has a simpler design as compared to hydrofoils model, which is mechanically easy to install.…”

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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“…One of the causes of the increase in the value of frictional resistance is due to excessive trim at the stern of the ship. In addition, variations in trim can cause instability in the form of porpoising on fast boats [3].…”

mentioning

confidence: 99%

“…E-mail : ahmadbai@gmail.com Aufal Nanda Oktova, Departmen of Marine Engineering, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia. E-mail : aufaloktova0610@gmail.com the planning hull and also can be applied to aircraft wings [3].…”

mentioning

confidence: 99%

Impact Analysis of Trim Tab Inclination Angles Variation to Propulsion Power Requirement of 6 Meter’s Speed Boat

Amiadji¹,

Baidowi²,

Oktova³

2021

IJMEIR

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⎯ determining the ship's propulsion power requirements is one of the most crucial things in ship design which is related to the ship's resistance. One of the causes of the high value of a ship's resistance is excessive trim of the ship. Therefore it needs a mechanism to overcome this, it can be by applying trim tabs. The trim tab is a small surface mounted on the ship's transom that can be adjusted according to the conditions of the ship. By adjusting the angle of the trim tab to be larger, it can increase the lift force and torque moment at the stern of the ship which can reduce the trim of the ship. Based on the boat's characteristics, referring to the guide from Bennet Marine, the appropriate trim tab's geometry for this boat is a trim tab with a span width of 18" (46 cm) and a chord length of 9" (23 cm). After selecting the trim tab geometry, then analyzing the resistance and trim of the ship using the CFD method. Through CFD simulation, trim tab with an angle of 15⁰ can reduce the value of the ship's resistance to 17.25% and for the trim can be reduced to 46.72%. Then after the ship's propulsion power requirements calculation, it is shown that the trim tab with an angle of 15⁰, a reduction of 11.56% is obtained from 78.854 kW to 69.741 kW.

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Interceptor and trim tab combination to prevent interceptor's unfit effects

Cited by 32 publications

References 16 publications

Investigation on the Lift Force Induced by the Interceptor and Its Affecting Factors: Experimental Study with Captive Model

Investigation on the Lift Force Induced by the Interceptor and Its Affecting Factors: Experimental Study with Captive Model

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

Impact Analysis of Trim Tab Inclination Angles Variation to Propulsion Power Requirement of 6 Meter’s Speed Boat

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