Numerical study of scale effect on the wake dynamics of a propeller

Sun, Shuai; Wang, Chao; Guo, Chunyu; Yuan, Zhen; Sun, Cong; Liu, Pengfei

doi:10.1016/j.oceaneng.2019.106810

Cited by 37 publications

(7 citation statements)

References 26 publications

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“…Higher Reynolds numbers lead to an increase in the lift coefficient and a reduction in the drag coefficient of the blade sections. The results obtained for the variations in the thrust and torque coefficients with scale are in good agreement with those presented in [26], [27].…”

Section: Numerical Results Of Propeller Open Water Characteristicssupporting

confidence: 88%

Numerical Study of the Scale Effect on Flow Around a Propeller Using the CFD Method

Van-Vu,

Le,

Thien

et al. 2024

Polish Maritime Research

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This paper presents an investigation of the scale effect on the flow around a propeller using the CFD method. The differences in the numerical setup and the results obtained for the characteristics of an open water propeller are described and analysed in this paper. Moreover, the paper also highlight and analyse the scale effect on differences in flow around the propeller, such as the pressure fields in the cross section, the distributions of the skin friction coefficient and limiting streamlines on the propeller blade, the vortices in the wake of the propeller, and the velocity fields. The differences in the flow around the propeller are more clearly seen when it works under heavy loading conditions, an important finding that can support designers in improving propeller performance, investigating cavitations, etc. at the full scale. The reference propeller used in this study is the benchmark propeller PPTC VP 1304.

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Section: Numerical Results Of Propeller Open Water Characteristicssupporting

confidence: 88%

Numerical Study of the Scale Effect on Flow Around a Propeller Using the CFD Method

Van-Vu,

Le,

Thien

et al. 2024

Polish Maritime Research

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“…From this experiment, it was confirmed that the same dimensionless performance was obtained under the same Reynolds number condition, and the efficiency increased as the Reynolds number increased. In general, studies concerning the propellers for ships with a diameter of several meters have also been confirmed to exhibit high thrust and efficiency values at high Reynolds numbers [25,26].…”

Section: Introductionmentioning

confidence: 93%

A Study on the Scale Effect According to the Reynolds Number in Propeller Flow Analysis and a Model Experiment

Bae

Ryi

et al. 2022

Aerospace

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The demand for new propeller designs has increased alongside the development of new technology, such as urban aircraft and large unmanned aerial vehicles. In order to experimentally identify the performance of a propeller, a wind tunnel that provides the operating flow is essential. However, in the case of a meter class or larger propeller, a large wind tunnel is required and the related equipment becomes heavy; therefore, it is difficult to implement in reality. For this reason, propeller studies have been conducted via reduced models. In this case, it is necessary to investigate the different performance outputs between the full- and model-scale propellers due to the size difference. In the current study, a method is proposed to investigate the difference in the aerodynamic performance caused by the difference in propeller scale using VLM and RANS calculations, and the differences are analyzed. The wind tunnel test also verified the propeller performance prediction method. The boundary of aerodynamic performance independent of the Reynolds number could be predicted through the VLM based on the ideal fluid assumption. From the RANS calculations, it was possible to present the difference in the aerodynamic performance when propellers of the same geometry with different ratios were operated using different Reynolds numbers. It was confirmed that each numerical method matched well with the wind tunnel test results in the range of the advance ratio that produced the maximum efficiency, and from the results, it was possible to observe the change in aerodynamic performance that differed according to the scale change.

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“…(2018) and Sun et al. (2020). LES was instead utilized by Balaras, Schroeder & Posa (2015), Kumar & Mahesh (2017), Posa et al.…”

Section: Introductionmentioning

confidence: 95%

The dynamics of the tip vortices shed by a tip-loaded propeller with winglets

Posa

2022

J. Fluid Mech.

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The tip vortices shed by two marine propellers are studied, relying on large-eddy simulation, using a cylindrical grid consisting of 5 billion points. A tip-loaded design, featuring winglets at the tips of its blades, is compared against a conventional one at the design advance coefficient and a model-scale Reynolds number equal to 432 000. The tip-loaded propeller achieves improved performance, but produces also more intense tip vortices. The propeller with winglets actually generates two vortices from the tip of each blade, originating at the edge of each winglet and at the junction between the winglets and the blades. They merge at a short distance downstream, within a diameter from the propeller plane. The helical vortices originating from this merging process experience a slower instability, in comparison with the tip vortices in the wake of the conventional propeller, persisting further downstream, due to the weaker shear with the wakes shed by the following blades. The results of the simulations highlight that splitting the single tip vortex of a conventional propeller into two smaller vortices by means of winglets does not imply necessarily the generation of weaker vortices and lower negative peaks of pressure at their core: the geometry of the winglets needs to be carefully optimized to achieve this target.

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Numerical study of scale effect on the wake dynamics of a propeller

Cited by 37 publications

References 26 publications

Numerical Study of the Scale Effect on Flow Around a Propeller Using the CFD Method

Numerical Study of the Scale Effect on Flow Around a Propeller Using the CFD Method

A Study on the Scale Effect According to the Reynolds Number in Propeller Flow Analysis and a Model Experiment

The dynamics of the tip vortices shed by a tip-loaded propeller with winglets

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