On Self-Propulsion Assessment of Marine Vehicles

Kınacı, Ömer Kemal; Gökçe, Metin Kemal; Alkan, Ahmet; Kükner, Abdi

doi:10.21278/brod69403

Cited by 35 publications

(7 citation statements)

References 19 publications

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“…The self-propulsion estimation method was validated several times using different benchmark ships, such as DARPA Suboff, 1/31.6 KCS scale model and 1/59.407 DTC scale model in Kinaci et al (2018); Japanese Bulk Carrier (JBC) in Gokce et al (2019) and 1/80 DTC scale model in Kinaci et al (2020). A new KCS self-propulsion validation study conducted on a different scale model (1/60.75) was provided to ensure the integrity of the present study.…”

Section: Spe Methods Validation Studiesmentioning

confidence: 99%

Effect of Propeller Pitch on Ship Propulsion

Öztürk

Belhenniche

et al. 2022

Trans. Marit. Sci.

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The appropriate choice of a marine engine identified by using self-propulsion model tests is compulsory, in particular with respect to the improvement of vessel performances. Numerical simulations or experimental methods provide insight into the problem of flow, where fixed pitch propellers or controllable pitch propellers are preferred. While calculation methods are time consuming and computationally demanding for both propeller types, hydrodynamic performance assessment has more workload in controllable pitch propellers. This paper aims to describe and demonstrate the practicability and effectiveness of the self-propulsion estimation (SPE) method in understanding the effect of propeller pitch on ship propulsion. Technically, the hydrostatic and geometric characteristics of the vessel and open-water propeller performances are the focal aspects that affect the self-propulsion parameters estimated by the SPE method. The input coefficients for SPE have been identified using a code that generates propeller open-water performance curves. The propellers utilized to study pitch variations have been based on the Wageningen B-series propeller database. The method was first validated on the full size Seiun Maru ship whose sea trial tests are available in literature. After extensive calculations for full size KCS and DTC at service speeds, the study focused on the effect of the Froude number on propulsion parameters. These calculations have demonstrated that greater propeller pitch does not improve propulsion efficiency, and that maximum propeller efficiency changes with a ship's forward speed.

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Section: Spe Methods Validation Studiesmentioning

confidence: 99%

Effect of Propeller Pitch on Ship Propulsion

Öztürk

Belhenniche

et al. 2022

Trans. Marit. Sci.

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“…All numerical results are between the ranges simulated for the wake factor values for KCS. They were in between the range 0.25 <w< 0.28 [52]. As an example, Figure 14 shows the axial and cross-flow velocities contour behind the ship at a model speed of 2.134 m/s (Fn=0.25).…”

Section: Wake Field Predictionmentioning

confidence: 99%

Numerical Simulations of the Hydrodynamic Performance of the Propeller with Wake Equalizing Duct behind the Ship

2022

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The equalizing wake flow into the propeller behind the ship is important from the hydrodynamic performance viewpoint. In this study, numerical simulations of the DTMB4119 propeller with two symmetric and asymmetric duct types behind the KRISO container ship (KCS) are performed using computational fluid dynamics (CFD). In order to improve the wake equaling flow, a combined duct and stators configurations were installed before the propeller in the stern of the ship and its hydrodynamic performance was studied using CFD. A duct with the NACA4415 section and two types of stator configurations are selected. The STAR-CCM+ software that uses the finite volume discretization method was used to solve the governing equations of the fluid flow. In simulating the turbulence model, the standard k-ω model was used and the solution method was validated by comparing the available experimental data. Output parameters such as thrust coefficient and torque coefficient in the open-water condition and behind the ship have been presented and discussed. Improvements in the propeller performance after mounting the asymmetric and symmetric ducts are found at 4.8% and 6.57%, respectively. So, it is concluded that the symmetric duct is more affected by the propeller performance and, hence, reduced fuel consumption considerably.

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“…For the steady case, flow equations are solved by adopting a rotating frame linked to the propeller and all blocks are also considered as rotary. In Fluent code, this procedure is called Moving Reference Frame (MRF) as reported by Kaewkhiaw (2018) and Kinaci et al (2018).…”

Section: Propeller Drawing Proceduresmentioning

confidence: 99%

Computational hydrodynamic analysis of a highly skewed marine propeller

Hussein¹,

Boumediene

Belhenniche

et al. 2019

J. nav. arch. mar. engg.

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The objective of the current paper is to study the flow around Seiun Maru Highly Skewed (HSP) marine propeller by assessment of blade forces and moments under non-cavitating case. The calculations are performed in open water (steady case) and non-uniform ship wake (Unsteady case). The governing equations based on Reynolds Averaged Navier-Stokes Equation (RANSE) are solved using Finite Volume Method. Ansys Fluent 14.0 is used to implement the simulation. For the steady case, Moving Reference Frame (MRF) is selected while sliding mesh technique is adopted for the unsteady case. Calculated open water performances in terms of thrust and torque coefficients fit very well with experimental data for a wide range of advance ratio. In the unsteady calculations, axial velocities, deduced from the nominal wake, are introduced in the Ansys fluent code. To locate suitably the non-uniform wake in the propeller front plane, three positions of inlet wake have been taken into account to determine their effects on the accuracy of the results. Obtained results show that computed performances are improved compared to panel method when the inlet is close to the propeller.

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On Self-Propulsion Assessment of Marine Vehicles

Cited by 35 publications

References 19 publications

Effect of Propeller Pitch on Ship Propulsion

Effect of Propeller Pitch on Ship Propulsion

Numerical Simulations of the Hydrodynamic Performance of the Propeller with Wake Equalizing Duct behind the Ship

Computational hydrodynamic analysis of a highly skewed marine propeller

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