Effects of the advance ratio on the evolution of a propeller wake

Baek, Dong Geun; Yoon, Hyun Sik; Jung, Jae Hwan; Kim, Ki-Sup; Paik, Bu‐Geun

doi:10.1016/j.compfluid.2015.06.010

Cited by 84 publications

(19 citation statements)

References 30 publications

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“…Therefore, the CFD flow solver (ISIS-CFD) on NUMECA Fine TM /Turbo V12.2 was based on the incompressible unsteady Reynolds-Averaged Navier-Stokes equation (URANSE) in which the solver applied the Finite Volume Method for representing the inflow and outflow areas, where the fluid flow is well behaved. Here, the governing equation has been discriminated using a Finite Volume Method with the velocity-pressure coupling and operated using a SIMPLE algorithm [23]. The Finite Volume Method also able to directly apply the integral spatial discretization in the physical space coordinate transformation to a computational space and this method also flexible to complex geometry structured and unstructured meshes.…”

Section: Governing Equationmentioning

confidence: 99%

Prediction of Propeller Performance Using Computational Fluid Dynamics Approach

Adam

Fitriadhy

Kong

et al. 2019

EPI-IJE

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A reliable prediction approach to obtain a sufficient thrust and torque to propel the ship at desired forward speed is obviously required. To achieve this objective, the authors propose to predict the thrust coefficient (KT), torque coefficient (KQ) and efficiency (η) of the propeller in open-water model test condition using Computational Fluid Dynamics (CFD) simulation approach. The computational simulation presented in the various number of rotational speed (RPM) within the range of advance ratio J=0.1 up to 1.05. The higher value of J leads to a decrease in 10KQ and KT. While the η increased steadily at the lower value of J and decreased at the higher value of J. The results also showed that the propeller with 1048 rpm obtains a better efficiency at J=0.95 with η= 88.25%, 10KQ=0.1654 and KT= 0.0942. The computation result is very useful as preliminary data for propeller performance characteristics.

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Section: Governing Equationmentioning

confidence: 99%

Prediction of Propeller Performance Using Computational Fluid Dynamics Approach

Adam

Fitriadhy

Kong

et al. 2019

EPI-IJE

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“…Zhu [6] concluded that the low-spectrum characteristics of the noise signals were very close to the pressure signals in the wake. Baek et al [7] studied the influence of the advance ratio on tip vortex of a marine propeller. They suggested that the empirical model of radial trajectory and the pitch of tip vortex could reflect the three-dimensional spiral in the wake of a propeller, and the proposed empirical model of tip vortex could help to construct a reliable wake model.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Investigation of a Winglet-Propeller Using an LES Model

Zhu

Gao

2019

JMSE

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The generation of tip vortex cavitation (TVC) is a common phenomenon in marine propellers. Therefore, it is important to find a way for the effective suppression of TVC. Based on the enlightenment of bionics, a propeller with winglets was numerically investigated by using a large eddy simulation (LES) model and the commercial software STAR-CCM+. Various variables, such as mesh size, number of prism layers, vapor properties and time step, were analyzed using the benchmark MAU5-80 propeller. The open water characteristics calculated for the benchmark propeller were compared with experimental data. The meshes in the region of the tip vortex wake were refined. The power spectral density (PSD) of the thrust coefficient and axial velocity were investigated. The comparison of TVC between the benchmark propeller and the propeller with winglets was studied with the Q-criterion, helicity and volume fraction of the vapor. The strength of the tip vortex wake is weakened by winglets; therefore, the presence of winglets leads to a reduction in vapor volume, which in turn alleviates TVC.

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“…The generation of the present grid system follows the same procedure as in Ref. [2]. Locally refined and hybrid grids were deployed in the computational domain grid division to guarantee the computational precision and operation speed requirements.…”

Section: Grid System and Validationmentioning

confidence: 99%

“…Due to the influence of the wake, the actual efficiency of the propeller is different from that of being in open water. A high wake zone is usually found in the upper half of the propeller disc which results in the decrease of propulsion efficiency, the deterioration of cavitation performance, and the increase of exciting force levels [2]. Many additional devices have been designed to improve the hydrodynamic performance and to reduce cavitation and noise.…”

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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Effects of the advance ratio on the evolution of a propeller wake

Cited by 84 publications

References 30 publications

Prediction of Propeller Performance Using Computational Fluid Dynamics Approach

Prediction of Propeller Performance Using Computational Fluid Dynamics Approach

A Numerical Investigation of a Winglet-Propeller Using an LES Model

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

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