A review of the equations used to predict the velocity distribution within a ship’s propeller jet

Lam, Wei-Haur; Hamil, G.A.; Song, Yongchen; Robinson, D. J.; Raghunathan, Srinivasan

doi:10.1016/j.oceaneng.2010.10.016

Cited by 57 publications

(20 citation statements)

References 7 publications

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“…Numerical simulation result shows that axial velocity at the efflux plane increases firstly, decrease then and increase finally results is 9.87%, 0.22% and 5.79% and the maximum difference is 0.036 m/s in three kinds of tip speed ratio. The dimensionless efflux velocity of Maganga's experiment is lower than Whale's, which is [25]. This may due to the difference of the tip speed ratio and the geometry of turbine.…”

Section: Efflux Velocitymentioning

confidence: 69%

“…Lam et al well developed and validated the efflux velocity equation of a ship propeller jet in the comparison of turbulence intensity between Laser Doppler Anemometry (LDA) measurements and CFD predictions [23,24]. The equations used to predict the velocity distribution within a ship's propeller jet is also reviewed by Lam et al [25]. Based on the fundamental works of ship propeller jet in Hamill et al and Lam et al Lam and Chen proposed two equations to predict the efflux velocity and its lateral velocity distribution at various cross sections along the rotation axis [16] and established the prediction model for turbine wake [26].…”

Section: Theoretical Researchmentioning

confidence: 99%

See 1 more Smart Citation

Novel energy coefficient used to predict efflux velocity of tidal current turbine

Wang

Lam

Cui

et al. 2018

Energy

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The efflux velocity is the basis for the prediction of turbine wake. A novel energy coefficient is defined to propose a new theoretical equation to predict the efflux velocity of tidal current turbine in this paper. Several CFD cases with different tip speed ratio and solidity is conducted using the DES-SA model. In order to overcome the limitations of the axial momentum theory, the effects of tip speed ratio and solidity on the efflux velocity are studied and the energy coefficients with different tip speed ratio and solidity are determined using the proposed equation based on the CFD results. Several semi-empirical efflux velocity equations are finally proposed by fitting the equation of the energy coefficient with tip speed ratio. The application of these equations in the prediction of wake flow and the power calculation of tidal turbine are also introduced in this paper.

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Section: Efflux Velocitymentioning

confidence: 69%

Section: Theoretical Researchmentioning

confidence: 99%

Novel energy coefficient used to predict efflux velocity of tidal current turbine

Wang

Lam

Cui

et al. 2018

Energy

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“…Propeller induced scour problems have been investigated experimentally using physical models such as Blaauw and Van de Kaa (1978), Bergh and Cederwall (1981), Verhey (1983), Veldhoven (2001), Schokking (2003) and Lam et al (2011).…”

Section: Conventional Propeller Azimuthal Systemmentioning

confidence: 99%

“…In this zone, entrainment of the surrounding fluid is balanced by reduction in the jet velocity. In addition, the water jet was axisymmetrical with the entire jet being mirrored about the central axis (Lam et al, 2011). The erosion protection of the slope under an open piled berth structure depends upon the angle of the slope, the coarseness of the materials in front of the filling, the danger of erosion from wave action at the upper part of the filling, the danger of erosion from propeller current from the main ship propellers and the ship bow and stern thrusters at the lower part of the filling (PIANC, 1997).…”

Section: Conventional Propeller Azimuthal Systemmentioning

confidence: 99%

Open Type Quay Structures Under Propeller Jets

Yüksel

Kayhan

Çelikoğlu

et al. 2012

Int. Conf. Coastal. Eng.

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In recent years, dramatically increases in ship dimensions and installed engine power, introduction of new type of special purpose ships and use of roll-on/roll-of, ferries, container ships can cause damage which in many cases threatens to undermine berth structures. Vessel jets of these types of ships can change flow area and cause erosion and scour around foundation of berth structures. Due to the damages in berth structures maintenance and repair cost may increase and also cause management losses. For this reason vessel jet induced the flow area around the berth structures during ships berthing and un-berthing operations are extremely important factor for the port structure design.This study is related with investigation of the flow characteristics at the sea bed around the pile, experimentally. Vessel jets were simulated both as circular wall jet and also propeller jet. The objective of this study is to determine the sea bed shear stress and velocity profiles along the jet axis for open type wharf structures (around a cylindrical piles and also on the slopes). Hot film anemometers were used to measure the magnitude of the bed shear stresses. The results from propeller jet experiments explained the erosion over the slopes. Bed shear and velocity profile measurements were carried out on the rigid bed conditions.

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“…Later, Stewart (1992) [5] , Hamill and Johnston (1993) [6] , Hashmi (1993) [7] , Lam et al (2011) [8] have made further research on the outflow velocity and velocity attenuation of the propeller jet flow field, and modified the Albertson empirical formula through physical model tests and numerical simulations, and obtained the propeller jet flow velocity formula and distribution law closer to the real situation.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of propeller jet field based on Star-ccm+

Li¹

2020

AJSRE

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During the ship's voyage, the propeller jet affects the movement of silt at the bottom of the bed. To research the influence of the bottom boundary on the propeller jet field, this paper takes the standard propeller DTRC4119 propeller as the research object and uses the CFD software Star-ccm+ to carry out a numerical simulation of the propeller jet under uniform flow. The flow velocity distribution of the jet under four operating conditions is mainly analyzed, including the axial velocity, tangential velocity and radial velocity of the jet. The results show that the distance between the propeller and the boundary does not affect the magnitude and distribution of the velocity on the initial plane but affects the shape of the axial velocity and the velocity on the central axis in the development zone; The closer to the bottom boundary, the greater the disturbance of tangential velocity and radial velocity, the peak value of tangential velocity will be affected and changed from central symmetry of velocity to unanimous trend earlier. The radial velocity contributes less to the overall velocity and can be ignored.

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A review of the equations used to predict the velocity distribution within a ship’s propeller jet

Cited by 57 publications

References 7 publications

Novel energy coefficient used to predict efflux velocity of tidal current turbine

Novel energy coefficient used to predict efflux velocity of tidal current turbine

Open Type Quay Structures Under Propeller Jets

Numerical simulation of propeller jet field based on Star-ccm+

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