Scale effects on open water characteristics of a controllable pitch propeller working within different duct designs

Bhattacharyya, Anirban; Krasilnikov, Vladimir I.; Steen, Sverre

doi:10.1016/j.oceaneng.2015.12.024

Cited by 64 publications

(23 citation statements)

References 5 publications

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“…Severe limitations on turbulence modeling were reported in [15] and the need for a good grid quality has been stressed from the point of view of how a solid wall should be better treated in a turbulence model. A detailed investigation of the scale effects on the open water characteristics of a moderately skewed four-bladed controllable pitch propeller, based on the Star-CCM+ software is presented in [16]. Computations were performed in both model and full scale conditions and the authors concluded that the scale effects on the open water thrust and torque characteristics were found to be in a comparable range with those obtained at the open water test experiments, thus emphasizing the performances of the solver.…”

Section: Introductionmentioning

confidence: 91%

Scale Effects on a Tip Rake Propeller Working in Open Water

Lungu

2019

JMSE

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The scale effect on the accuracy of a numerical simulation in ship hydrodynamics represents an important issue of the propeller numerical analysis. To grasp a better understanding on the influence of this effect, an introspection on the performances of an unconventional propeller is proposed in the present study. The paper describes an investigation of the performances of a tip rake propeller recently chosen as benchmark by the International Towing Tank Conference organization (ITTC hereafter). The numerical simulation is carried out by making use of the ISIS-CFD solver, part of the FineTM/Marine package available in the NUMECA suite. The solver is based on the finite volume method to build the spatial discretization of the governing equations. The incompressible unsteady Reynolds Averaged Navier-Stokes Equations (RANSE) are solved in a global approach. Reported solutions are compared with the experimental data provided by Schiffbau-Versuchsanstalt (SVA) Potsdam GmbH to validate the accuracy of the numerical approach. Since for the full scale the experimental data could not be possible, the ITTC’78 extrapolation method-based proposed by the SVA Potsdam has been taken as a basis for comparisons and discussions. A set of remarks will conclude the paper by providing some guidelines for further approaches in terms of the particulars of the numerics that may be further employed in similar studies.

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Section: Introductionmentioning

confidence: 91%

Scale Effects on a Tip Rake Propeller Working in Open Water

Lungu

2019

JMSE

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“…In this closed gap model, the boundary condition on the gap panels sets the source strength to cancel the normal component of the inflow velocity leading to the Neumann boundary condition, Equation (4). The gap strip extends from the blade tip to the duct inner side.…”

Section: Panel Code Propanmentioning

confidence: 99%

“…Posteriorly, the influence of the rudder was also taken into account in the calculation of the viscous flow [2]. In addition, Abdel-Maksoud and Heinke [3], and Bhattacharyya et al [4] have investigated the scale effects on ducted propellers numerically using RANS. Alternatively, Kim et al [5] presented detailed RANS simulations for a ducted propeller system including verification and validation studies.…”

Section: Introductionmentioning

confidence: 99%

Prediction of the Open-Water Performance of Ducted Propellers with a Panel Method

Baltazar

Rijpkema

Campos

et al. 2018

JMSE

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Abstract:In the present work, a comparison between the results obtained by a panel code with a Reynolds-averaged Navier-Stokes (RANS) code is made to obtain a better insight on the viscous effects of the ducted propeller and on the limitations of the inviscid flow model, especially near bollard pull conditions or low advance ratios, which are important in the design stage. The analysis is carried out for propeller Ka4-70 operating inside duct 19A. From the comparison, several modelling aspects are studied for improvement of the inviscid (potential) flow solution. Finally, the experimental open-water data is compared with the panel method and RANS solutions. A strong influence of the blade wake pitch, especially near the blade tip, on the ducted propeller force predictions is seen. A reduction of the pitch of the gap strip is proposed for improvement of the performance prediction at low advance ratios.

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“…Heinke et al [9] applied an interpolation scaling procedure based on a set of POT tests carried out at multiple Reynolds numbers. Analyses of Rn scale effects and scaling methods for ducted propellers and non-conventional propellers have been addressed by Bhattacharyya1 et al [10][11][12], Sánchez-Caja et al [13], Shin and Andersen [14], and Moran-Guerrero et al [15] recently.…”

Section: Introductionmentioning

confidence: 99%

Transitional Flow on Model Propellers and Their Influence on Relative Rotative Efficiency

Lindell

Werner

2019

JMSE

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Unexpected low value of the relative rotative efficiency ηR is sometimes noted when scaling the towing tank model-test result with the ITTC-78 method to obtain the propulsive efficiency factors of propellers. The paper explains the causes of this phenomenon. The boundary layer state of three propellers was studied by a paint test and a RANS method. The paint tests showed that the propellers in behind conditions at low Reynolds number (Rn) are covered mainly with laminar flow, which is different from open water tests conducted at a high Rn. Apart from that a moderate difference in Rn between the open water and the self-propulsion test may lead to a low ηR value, the paper points out that flow separation in behind conditions could be another significant reason for the drop of ηR for some propellers. Therefore, two factors will lead to an unexpected decrease of ηR: (1) A slightly lower open water torque interpolated from an open water test carried out at a high Rn and (2) a slightly higher torque in a self-propulsion test due to laminar flow separation near the trailing edge. The phenomenon is caused by the Rn scaled effect and closely associated with design philosophy like the blade section profile, the chord length, and chordwise load distribution.

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Scale effects on open water characteristics of a controllable pitch propeller working within different duct designs

Cited by 64 publications

References 5 publications

Scale Effects on a Tip Rake Propeller Working in Open Water

Scale Effects on a Tip Rake Propeller Working in Open Water

Prediction of the Open-Water Performance of Ducted Propellers with a Panel Method

Transitional Flow on Model Propellers and Their Influence on Relative Rotative Efficiency

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