Investigating the effect of geometric parameters on hydrodynamic and hydro-acoustic performances of submerged propellers

Razaghian, A.H.; Ebrahimi, Abbas; Zahedi, Fatemeh; Javanmardi, Mohammadreza; Seif, Mohammad Saeed

doi:10.1016/j.apor.2021.102773

Cited by 16 publications

(3 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2021; Razaghian et al. 2021; Petris, Cianferra & Armenio 2022; Posa et al. 2022 b ) and affecting their interaction with downstream devices, such as rudders (Kinnas et al.…”

Section: Introductionmentioning

confidence: 99%

“…Marine propellers shed large structures, especially from the tip of their blades and from their hub, having an important impact on their acoustic signature (Bagheri et al 2017;Cianferra, Petronio & Armenio 2019;Wang, Göttsche & Abdel-Maksoud 2020;Ebrahimi et al 2021;Razaghian et al 2021;Petris, Cianferra & Armenio 2022;) and affecting their interaction with downstream devices, such as rudders (Kinnas et al 2007;Felli, Camussi & Guj 2009;Felli & Falchi 2011;Felli, Grizzi & Falchi 2014;Badoe, Phillips & Turnock 2015;He & Kinnas 2017;Villa et al 2018;Hu et al 2019bHu et al , 2021Wang et al 2019;Villa, Franceschi & Viviani 2020;Felli 2021;, 2022aZhang et al 2022). A number of studies dealing with the wake of marine propellers are currently available in the literature, including both physical experiments and numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Anisotropy of turbulence at the core of the tip and hub vortices shed by a marine propeller

Posa

2023

J. Fluid Mech.

View full text Add to dashboard Cite

Large-eddy simulation on a grid consisting of 5 billion points was utilized to study the properties of turbulence at the core of the tip and hub vortices shed by a marine propeller across working conditions. Turbulence at the core of the tip vortices was found to be initially isotropic, moving towards a ‘cigar-shaped’ axisymmetric state as instability grows, dominated by turbulent fluctuations of the velocity component directed in the radial direction of the cylindrical reference frame centred at the wake axis. The break-up of the coherence of the tip vortices is instead characterized by turbulence recovering an isotropic state. This process is accelerated by growing load conditions of the propeller. In contrast, during instability of the hub vortex, turbulence at its core develops a ‘pancake-shaped’ axisymmetric state, dominated by the fluctuations of the radial and azimuthal velocities. However, at higher propeller loads turbulence at the core of the hub vortex keeps close to isotropy, thanks to a faster instability. Within both tip and hub vortices the deviations from Boussinesq's hypothesis were found very significant, providing evidence of the unsuitability of conventional turbulence modelling. At the core of the tip vortices they become especially large at their break-up and for increasing load conditions of the propeller, equivalent to more intense structures. In contrast, at the core of the hub vortex they were verified to be decreasing functions of the propeller load.

show abstract

“…2021; Razaghian et al. 2021; Petris, Cianferra & Armenio 2022; Posa et al. 2022 b ) and affecting their interaction with downstream devices, such as rudders (Kinnas et al.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anisotropy of turbulence at the core of the tip and hub vortices shed by a marine propeller

Posa

2023

J. Fluid Mech.

View full text Add to dashboard Cite

show abstract

“…Relevant practitioners in the shipbuilding industry have long been concerned by the noise of propellers, and related research on reducing propeller noise is ongoing. In terms of cavitation noise, researchers have conducted a numerical analysis of noise models [ 2 , 4 , 5 ], blade structure optimization [ 3 , 6 , 7 ], and surface treatment [ 8 ]. The current solution to vibration and noise between the propeller and the main shaft is to install an additional vibration isolation system [ 9 , 10 ], but this occupies the interior space of the ship, complicates the transmission system, and cannot resist vibration.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of MnCuNiFe–CuAlNiFeMn Gradient Alloy by Laser Engineering Net Shaping System

et al. 2022

View full text Add to dashboard Cite

Marine noise pollution generated by propellers is of wide concern. Traditional propeller materials (nickel–aluminum bronze (NAB) alloys) can no longer meet the requirements for reducing shaft vibration. However, the Mn–Cu alloy developed to solve the problem of propeller vibration is affected by seawater corrosion, which greatly limits the application of the alloy in the field of marine materials. In this study, the M2052–NAB gradient alloy was developed for the first time using LENS technology to improve the corrosion resistance while retaining the damping properties of the M2052 alloy. We hope this alloy can provide a material research basis for the development of low-noise propellers. This study shows that, after solution-aging of M2052 alloy as the matrix, the martensitic transformation temperature increased to approach the antiferromagnetic transformation temperature, which promoted twinning and martensitic transformation. The aging process also eliminated dendrite segregation, promoted the equiaxed γ-MnCu phase, and increased the crystal size to reduce the number of dislocations, resulting in obvious modulus softening of the alloy. NAB after deposition had higher hardness and good corrosion resistance than the as-cast alloy, which offers good corrosion protection for the M2052 alloy. This research provides new material options for the field of shipbuilding.

show abstract

Proposition of a Propeller Shape: A Numerical Study of Its Performance

Choayb

2023

Arab J Sci Eng

View full text Add to dashboard Cite

Investigating the effect of geometric parameters on hydrodynamic and hydro-acoustic performances of submerged propellers

Cited by 16 publications

References 8 publications

Anisotropy of turbulence at the core of the tip and hub vortices shed by a marine propeller

Anisotropy of turbulence at the core of the tip and hub vortices shed by a marine propeller

Fabrication of MnCuNiFe–CuAlNiFeMn Gradient Alloy by Laser Engineering Net Shaping System

Proposition of a Propeller Shape: A Numerical Study of Its Performance

Contact Info

Product

Resources

About