Blockage effect influence on model-scale marine propeller performance and cavitation pattern

Katsuno, Eduardo Tadashi; Dantas, João Lucas Dozzi

doi:10.1016/j.apor.2021.103019

Cited by 4 publications

(2 citation statements)

References 23 publications

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“…The same hexahedral mesh used in previous works (Katsuno andDantas, 2017, 2022) is adopted for the CFD analysis and to verify the TOM results. Katsuno and Dantas (2022), using the same mesh density and refinement volumes on the same propeller, compares the numerical results with experiments, showing also grid refinement studies to estimate the numerical uncertainties.…”

Section: Mesh Overviewmentioning

confidence: 93%

Topology optimization of low-friction painting distribution on a marine propeller

Katsuno

Dantas²,

Silva³

2022

Struct Multidisc Optim

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Following the United Nations 2030 Agenda to achieve a better and more sustainable future, there is an interest in new energy efficiency technologies to address emissions from international maritime shipping. A large portion of the available research focused on paints that reduce the fouling and friction of the hulls of these vessels, such as hydrophobic paints. Yet, research applied to propellers is smaller when compared to hulls. Covering the blade surface with hydrophobic paint behavior changes the drag of the propeller and, consequently, the hydrodynamic efficiency. However, covering a blade may adversely affect the flow in certain regions, reducing the propeller performance. This paper studies a practical application of the super-hydrophobic surface (SHS) pattern distribution on a marine propeller using the topology optimization method to determine regions where the application of surface treatment leads to improved propeller efficiency. The numerical method is developed to model the turbulent flow condition with the behavior of the boundary layer that imposes the low-friction/hydrophobicity effect to predict the performance of a coated propeller. To evaluate the proposed method, firstly, a fully covered blade is simulated for several hydrophobic conditions and then the topology optimization is conducted. Despite the SHS behavior being simplified by adopting the slip length model, the obtained optimization results show the regions to be prioritized in order to maximize the hydrodynamic efficiency.

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Section: Mesh Overviewmentioning

confidence: 93%

Topology optimization of low-friction painting distribution on a marine propeller

Katsuno

Dantas²,

Silva³

2022

Struct Multidisc Optim

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“…The impact of blockage and cavitation have been thoroughly investigated. (Katsuno and Dantas 2022). The axial turbines were tested for different tip speed ratios under different blockage condition (Kinsey and Dumas 2017).…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations of Hydrokinetic Turbine Providing Fillet at the Leading Edge Corner of the Runner Blades

2023

JAFM

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Water streams with low heads can be found in India, both naturally as well as through irrigation canals. These natural resources can be used to generate electricity by utilising Hydrokinetic water turbines. The current investigation includes an experimental investigation of the axial flow turbine in order to make use of these naturally available resources. For Axial Flow Turbines (AFT), the influence of the fillet radius at the leading edge corner of the runner blade is studied. The experiments are carried out under various turbine loads and corresponding head conditions. The 3D printed runners with six different fillet radius (Rtu), i.e. 0 mm, 2 mm, 4 mm, 6 mm, 8 mm, and 10 mm are examined experimentally. The results are presented in the form of obtained efficiency (η ) with a diverse Fillet Radius Ratio (FRR) for different Tip Speed Ratio (TSR) and equivalent head (H). The results indicate that, at the head, 0.012 m, with a sharp edge, i.e., FRR = 0 (Rtu = 0 mm), the minimum efficiency of 34.90% is recorded. However, at the same water head, the maximum efficiency of 84.82% is achieved with FRR = 0.046 (Rtu = 2 mm).

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Effects of axial launch spacing on cavitation interference and load characteristics during underwater salvo

Gao,

Shi,

et al. 2024

Applied Ocean Research

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Blockage effect influence on model-scale marine propeller performance and cavitation pattern

Cited by 4 publications

References 23 publications

Topology optimization of low-friction painting distribution on a marine propeller

Topology optimization of low-friction painting distribution on a marine propeller

Experimental Investigations of Hydrokinetic Turbine Providing Fillet at the Leading Edge Corner of the Runner Blades

Effects of axial launch spacing on cavitation interference and load characteristics during underwater salvo

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