A Numerical Study on the Open Water Performance of a Propeller With Sinusoidal Pitch Motion

Jang, Yoonho; Eom, M.J.; Paik, Kwang-Jun; Kim, Sang-Hyun; Song, Gisu

doi:10.21278/brod71105

Cited by 13 publications

(4 citation statements)

References 8 publications

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“…During our pre-study, it was found that the wake flow characteristics of the ducted propellers calculated in a cylindrical outer domain were the same as those obtained from a rectangular one. Therefore, a rectangular outer fluid domain was adopted, which is same as those in Dubas et al (2015), Hu et al (2019) and Jang et al (2020). Diameter of the rotating domain is 1.0 D .…”

Section: Numerical Settingsmentioning

confidence: 99%

Effect of ducts on the hydrodynamic performance of marine propellers

Liu

Gong

Bian

et al. 2021

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PurposeHydrodynamic forces and efficiency of bare propeller and ducted propellers with a wide range of advance ratio (J) and attack angle (θ) are examined. The thrust and torque coefficients and the efficiency are presented and discussed in detail. The present results give a reliable guidance to the improvement of the hydrodynamic characteristics of ducted propellers.Design/methodology/approachThe effect of a duct on the hydrodynamic performance of the KP458 propeller is numerically investigated in this study. Finite volume method (FVM)-based simulations are performed for a wide range of advance ratio J (0 ≤ J ≤ 0.75) and attack angle θ of the duct (15° ≤ θ ≤ 45°). A cubic computational domain is employed in this study, and the moving reference frame (MRF) approach is adopted to handle the rotation of the propeller. Turbulence is accounted for with the RNG k-ε model. The present numerical results are first compared against available experimental data and a good agreement is achieved.FindingsThe simulation results demonstrate that the hydrodynamic forces and efficiency increases and decreases with J, respectively, at the same attack angle. In addition, it is demonstrated that the hydrodynamic forces and efficiency are both improved due to the presence of the duct, which eventually leads a better hydrodynamic performance at high advance ratios. It is further revealed that as the attack angle increases, the pressure difference between the suction- and pressure-surfaces of the propeller is also augmented, which results in a larger thrust. The wake field is more uniform at θ = 30°, suggesting that a higher efficiency can be obtained.Originality/valueThe present study aims to investigate the effect of a duct on the KP458 propeller subjected to uniform inbound flow. The relationship between the uniform incoming flow and the attack angle of the duct is mainly focused, and the design of the ducted propellers for any ship hull can be improved according to this relationship.

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Section: Numerical Settingsmentioning

confidence: 99%

Effect of ducts on the hydrodynamic performance of marine propellers

Liu

Gong

Bian

et al. 2021

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“…Gaggero and Villa (2018) proposed cavitating propeller performance with inclined shaft conditions with OpenFOAM (PPTC 2015 Test Case). Paik et al (2020) studied open water propeller performance with sinusoidal pitch motion, which was set at inclined angles (−10° to 10°) by STAR-CCM+ software. An optimization procedure for propeller selection for different shaft inclinations has been conducted by Soares et al (2022).…”

Section: Introductionmentioning

confidence: 99%

Effects of a long-drive shaft on flow field around a high-speed boat propeller in Thailand using CFD

Kaewkhiaw

2024

Marit. Technol. Res.

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The Long-Tail Boat (LTB) is a high-speed boat in Thailand. The propulsive system has a long-drive shaft that holds the propeller on the end of the shaft. It is used under inclined shaft conditions because of shallow water draft. Thus, the fluid flow into the propeller blade area is unsteady due to the cross-flow component. Therefore, the long-drive shaft is an important parameter in generating the flow field before entering the propeller blades, which affects propeller efficiency. This paper presents a numerical analysis of the flow field around a long-drive shaft and propeller blade areas in a full-scale propeller size using the Reynolds-Averaged Navier-Stokes (RANS) solver. The unsteady propeller performance is carried out by considering inclined flow conditions. In addition, the computational results of fluid flow in terms of the pressure distributions and wake fields around a long-drive shaft and propeller are investigated, which influence the propeller performance and the generating drag forces by a long-drive shaft. The results can be applied to modify the long-drive shaft of boats. Highlights The Long-Tail Boat (LTB) is a local vessel in Thailand that has a high speed Computational fluid dynamics (CFD) code ANSYS Fluent to study the effect of a long-drive shaft propeller with inclined shaft angles The long-drive shaft should be designed in suitable for operating the inclined shaft conditions because it will directly affect the propeller efficiency

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“…Similarly, the most common parameters applied to define the propeller behaviors are propeller rotation, propeller diameter and vessel velocity. In recent years, the effects of the parameters on the propeller have been investigated due to highspeed and maneuvering capability needs [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

The numerical investigation of spindle torque for a controllable pitch propeller in feathering maneuver

Yurtseven

Aktay

2023

brod

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Present paper studies the variation of the blade spindle torque in a controllable pitch propeller (CPP) during the feathering maneuver, which is one of the rare but most challenging propeller maneuvers in CPP operation. The knowledge of the spindle torque under different operating conditions is one of the key features for the CPP controller unit design. The aim of this study is determining the forces needed to be governed to control the blade motion of a CPP converted from a fixed pitch propeller and the scale effect on these forces. So as to obtain a realistic numerical setup, the time-dependent superposed motion of the main rotation of the propeller and the rotation of each blade around its axis is modeled using a hybrid overset/sliding mesh technique. The spindle torque values were calculated during the dynamical variation of the blade pitch in feathering maneuver, and a novel expression is recommended to non-dimensionalize the predicted spindle torque. The result revealed that the required torque values to rotate each blade during the propeller maneuver is rising up to a critical pitch angle. Further increment of the pitch angle results in lower spindle torque values. Furthermore, this critical pitch angle is inversely proportional to the propeller loading.

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A Numerical Study on the Open Water Performance of a Propeller With Sinusoidal Pitch Motion

Cited by 13 publications

References 8 publications

Effect of ducts on the hydrodynamic performance of marine propellers

Effect of ducts on the hydrodynamic performance of marine propellers

Effects of a long-drive shaft on flow field around a high-speed boat propeller in Thailand using CFD

The numerical investigation of spindle torque for a controllable pitch propeller in feathering maneuver

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