A numerical study for effectiveness of a wake equalizing duct

Çelik, Fahri

doi:10.1016/j.oceaneng.2007.04.006

Cited by 31 publications

(15 citation statements)

References 4 publications

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“…Korkut (2006) carried out resistance and self-propulsion experiments for a partial wake equalizing duct. Celik (2007) studied an effect of a wake equalizing duct on the propulsion performance using CFD and showed 10% maximum power gain. Celik and Guner (2007) studied PSS using lifting line theory and CFD.…”

Section: Introductionmentioning

confidence: 99%

Full scale wake prediction of an energy saving device by using computational fluid dynamics

Park

Oh²,

Rhee

et al. 2015

Ocean Engineering

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Section: Introductionmentioning

confidence: 99%

Full scale wake prediction of an energy saving device by using computational fluid dynamics

Park

Oh²,

Rhee

et al. 2015

Ocean Engineering

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“…Thanks to the rapid development of CFD, the working principle and the scale effects on ESDs are becoming clearer than before (Heinke 2011 andÇelik 2007). In addition, CFD provides guidance on ESD designs so that the performance of ESDs can be optimized even for fullscale conditions and flow separation, often found on misaligned ESDs, can be prevented (Zondervan et al 2011).…”

Section: Introductionmentioning

confidence: 99%

An Exploratory Study on the Working Principles of Energy Saving Devices (ESDs): PIV, CFD Investigations and ESD Design Guidelines

Dang

Dong

Chen

2012

Volume 5: Ocean Engineering; CFD and VIV

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A new Joint Industry Project (JIP) has been initiated recently by MARIN, called ESD-JILI ( ( ( (机理机理机理机理) ) ) ), looking into the working principles and scale effects on Energy Saving Devices (ESDs). Three ESDs have been chosen for the investigations in the first phase. They were a preduct with a supporting stator in the duct, a pre-swirl stator with asymmetric blade design and Propeller Boss Cap Fins (PBCF). Measurements of forces and moments on all components of the ESDs have been carried out in selfpropulsion model tests with dedicated sensors. Particle Image Velocimetry (PIV) technique has been used in the investigation of the detailed flow around the ESDs. In order to investigate the scale effects in model tests, a fullscale wake field was approximated by a 'smart ship model'. Computational Fluid Dynamics (CFD) calculations were carried out both for designing the smart ship model and also for the detailed flow around the ESDs. Some findings and fundamental issues on scale-effects of the ESDs are addressed in this paper.

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“…Çelik [23] numerically investigated the effect of a WED on the propulsion performance of a chemical tanker. The propulsion characteristics, path lines over the after body, and viscous resistance forces were analyzed for six WED cases combined with the ship and propeller at various ship speeds.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the effects of a fan-shaped Mewis duct before a propeller on propulsion performance

et al. 2018

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To define the guidelines for the design of a Mewis duct for a small bulk cargo ship, a numerical study was carried out to investigate the effects of a fan-shaped Mewis duct on propeller performance of a 38,000 t bulk cargo ship with a three-blade propeller. Calculations were performed using the STAR-CCM+ software based on the solution of the Reynolds averaged Navier-Stokes (RANS) equation. Computations were carried out for a wide range of locations from 0.11D to 0.21D upstream from the propeller disc, a radius of trailing edge from 0.65R to 1.05R, and angle of attack of the inner fins, where from 0° to 10° of the fan-shaped Mewis duct, where D is the diameter of the propeller and R is the radius of the propeller. With the installation of the duct, the axial mean wake fraction on the propeller disc decreased, while the tangential mean wake fraction increased significantly. As the installation position was far away from the propeller, the axial mean wake fraction varied in a wave pattern, while the tangential mean wake fraction increased. With the increase of the radius and the angle of attack of the inner fins of the duct, the axial mean wake fraction first decreased and then increased, while the tangential mean wake fraction increased gradually. Correspondingly, the propeller force coefficients and efficiencies with the duct were all more than those without the duct and changed with the variations of the duct parameters. When the propeller and duct were taken as a propulsion system, the efficiency of the system was less than that of only the propeller. At the same time, with variations of the location, radius, and angle of attack of the inner fins of the duct, the efficiency of the system first increased and then decreased gradually, which indicates that there was an optimum design value for all of the duct parameters. Moreover, only when the design of these duct parameters are reasonable can energy savings be achieved; otherwise, the opposite effect is produced. Eventually, with the installation of the fan-shaped Mewis duct, the wake harmonic degree on the propeller disc can be significantly improved.

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A numerical study for effectiveness of a wake equalizing duct

Cited by 31 publications

References 4 publications

Full scale wake prediction of an energy saving device by using computational fluid dynamics

Full scale wake prediction of an energy saving device by using computational fluid dynamics

An Exploratory Study on the Working Principles of Energy Saving Devices (ESDs): PIV, CFD Investigations and ESD Design Guidelines

Investigation of the effects of a fan-shaped Mewis duct before a propeller on propulsion performance

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