Influence of propeller tip roughness on tip vortex strength and propeller performance

Krüger, Caroline; Kornev, Nikolaĭ; Greitsch, Lars

doi:10.1080/09377255.2016.1205293

Cited by 14 publications

(10 citation statements)

References 3 publications

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“…With an increasing interest in Computational Fluid Dynamics (CFD), Krüger et al [32] investigated the effects of roughness on open water propeller performance under non-cavitating conditions using RANS and LES (Large Eddy Simulation) coupled with roughness model. The main aim of the study was to investigate the effects of propeller tip roughness and application area on the tip vortex pressure.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Results showed that with the rising number of bubbles at the beginning, there is an increase in the noise; however, there is a remarkable drop when the numbers of bubbles become larger for both roughened and smooth cases until 63Hz. Krüger et al [32] stated that Philipp and Ninnemann [37]`s study showed the application of roughness on a small area at the suction side of the blade close to the trailing edge could destabilise the tip vortex formation, hence its early breakdown. Cong et al [38] conducted an experimental study and tested the cavitation characteristics of a composite coating on a propeller.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The scaling laws of the roughness strongly depend on the wall shear stress velocities at the propeller blade tips. The differences in wall shear stress velocities between the model scale and full scale cause significantly extended roughness height in model scale [32]. In order to replicate the same roughness impact on the model scale, the roughness height must be nearly the same order with the full-scale propeller.…”

Section: Figure 10 Efficiency Loss Due To Roughness At Different Advance Coefficientsmentioning

confidence: 99%

“…In order to replicate the same roughness impact on the model scale, the roughness height must be nearly the same order with the full-scale propeller. Since the geometric and hydrodynamic roughness similarity cannot be achieved together between the model and full-scale propeller, as stated in the study of Kruger et al [32], the full-scale propeller efficiency is expected to be less influenced by the viscous effects than for the model scale propeller.…”

Section: Figure 10 Efficiency Loss Due To Roughness At Different Advance Coefficientsmentioning

confidence: 99%

See 3 more Smart Citations

Effect of biofouling roughness on a marine propeller's performance including cavitation and underwater radiated noise (URN)

Sezen

Uzun

Ozyurt

et al. 2021

Applied Ocean Research

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Section: Figure 10 Efficiency Loss Due To Roughness At Different Advance Coefficientsmentioning

confidence: 99%

Section: Figure 10 Efficiency Loss Due To Roughness At Different Advance Coefficientsmentioning

confidence: 99%

See 2 more Smart Citations

Effect of biofouling roughness on a marine propeller's performance including cavitation and underwater radiated noise (URN)

Sezen

Uzun

Ozyurt

et al. 2021

Applied Ocean Research

View full text Add to dashboard Cite

“…However, the online version of record will be different from this version once it has been copyedited and typeset. PLEASE CITE THIS ARTICLE AS DOI:10.1063/5.0009622 [19] reported that suction-sided sand grain roughness reduces the tip vortex strength and leads to pressure increase in the vortex core. Souders and Platzer [20] discussed that the thicker turbulent boundary layer on the wing tip results in an increased tip vortex core radius and a decrease in the tip vortex maximum tangential velocity as compared to the laminar flow case.…”

Section: Introductionmentioning

confidence: 99%

Investigations of tip vortex mitigation by using roughness

et al. 2020

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The application of artificial roughness to mitigate tip vortex cavitation inception is analyzed through numerical and experimental investigations carried out on an elliptical foil. Different roughness configurations and sizes are tested and effects on cavitation inception, drag, and lift, are studied. Implicit Large Eddy Simulation (ILES) is employed to conduct the simulation on a proper grid resolution having the tip vortex spatial resolution as fine as 0.062 mm. Two different approaches including using a rough wall function and resolving the flow around roughness elements are evaluated. New experiments, performed in the cavitation tunnel at Kongsberg Hydrodynamic Research Centre, for the rough foil are presented.The vortical structures and vorticity magnitude distributions are employed to demonstrate how different roughness patterns and configurations contribute to the vortex roll-up and consequently on the tip vortex strength.It is found that the application of roughness on the leading edge, tip region and trailing edge of the suction side are acceptable to mitigate the tip vortex and also to limit the performance degradation. This is regarded to be in close relation with the way that the tip vortex forms in the studied operating condition. The analysis of boundary layer characteristics shows a separation line caused by roughness is the reason for a more even distribution of vorticity over the tip compared to the smooth foil condition leading to a reduction in vortex strength. For the optimum roughness pattern, both the numerical results and experimental measurements show a decrease in the tip vortex cavitation inception as large as 33 % compared to the smooth foil condition with a drag force increase observed to be less than 2 %.

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A review of recent advances in the effects of surface and interface properties on marine propellers

Zhu

2023

Friction

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Marine propellers are important propulsion devices for both surface ships and underwater vehicles. Increasingly severe environmental problems have required further performance enhancement for propellers. Nowadays, traditional methods to improve propeller performances through geometrical and structural optimizations have been extensively investigated, while the underlying mechanisms of the effects of surface and interface properties on marine propellers are still far from being fully understood. This paper presented a comprehensive review of recent advances in the effects of surface and interface properties, such as surface roughness and surface wettability, on marine propellers with an emphasis on the significant improvements in both hydrodynamic and cavitation performances, hoping to arouse more in-depth investigations in the field of surface/interface science and technologies on marine propellers, and also promote the state-of-the-art technologies, such as superlubricity technology, into practical applications.

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Influence of propeller tip roughness on tip vortex strength and propeller performance

Cited by 14 publications

References 3 publications

Effect of biofouling roughness on a marine propeller's performance including cavitation and underwater radiated noise (URN)

Effect of biofouling roughness on a marine propeller's performance including cavitation and underwater radiated noise (URN)

Investigations of tip vortex mitigation by using roughness

A review of recent advances in the effects of surface and interface properties on marine propellers

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