An experimental investigation of hydrodynamic performance, cavitation, and noise of a normal skew B-series marine propeller in the cavitation tunnel

Ebrahimi, Abouzar; Razaghian, A.H.; Tootian, A.; Seif, Mohammad Saeed

doi:10.1016/j.oceaneng.2021.109739

Cited by 27 publications

(4 citation statements)

References 15 publications

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“…Wu et al [1] proposed a generalized definition of cavitation intensity from the perspective of energy, derived an approximate formula for calculating cavitation intensity, and discussed its measurement method. Ebrahimi et al [2] conducted an experimental study on the cavitation of five-blade B-series propellers. They also extracted tip vortex cavitation and vapor volume contours for different advance coefficients.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Cavitation Characteristics through Butterfly Valve under Different Regulation Conditions

Zhang,

Hu,

Yin

et al. 2024

Processes

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Butterfly valves are widely used in the pipeline transportation industry due to their safety and reliability, as well as their low manufacturing and operation costs. Cavitation is a common phenomenon in the butterfly valve that can lead to serious damage to a valve’s components. Therefore, it is important to investigate the generation and evolution of cavitation in butterfly valves. In this study, LES and the Zwart model were used as the turbulence and cavitation models, respectively, to simulate cavitation through a butterfly valve. The influence of the valve opening degree and inlet flow velocity on dynamic cavitation through the butterfly valve were studied. Furthermore, the cavitated flow field was examined, along with the performance coefficients of the butterfly valve. With the increase in the incoming flow velocity, the high-speed jet zone over a large-range and low-pressure zone appeared inside the downstream of butterfly valve, which affected its stability and the cavitation generation through the valve. Furthermore, the flow coefficient decreased with the increase in vapor volume. In addition, the results indicated that cavitation was more easily induced for smaller valve opening degrees, and the interaction between cavitation and solid walls was stronger. Due to the existence of cavitation, the flow characteristics of butterfly valves are seriously affected.

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Section: Introductionmentioning

confidence: 99%

Numerical Study of Cavitation Characteristics through Butterfly Valve under Different Regulation Conditions

Zhang,

Hu,

Yin

et al. 2024

Processes

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“…2017; Cianferra, Petronio & Armenio 2019; Wang, Göttsche & Abdel-Maksoud 2020; Ebrahimi et al. 2021; Razaghian et al. 2021; Petris, Cianferra & Armenio 2022; Posa et al.…”

Section: Introductionunclassified

“…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%

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

Posa

2023

J. Fluid Mech.

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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.

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“…Vortex cavitation [1] is a common physical phenomenon in hydraulic machines, and it usually occurs at the inlet [2] and the draft tube [3,4] of the hydraulic machinery, and the tail of the blade, such as pump impeller [5] and marine propeller [6][7][8]. Cavitation could cause pressure fluctuation [9,10], uneven load distribution, hydrodynamic noise [11] and erosion [12], which seriously reduce the operation efficiency of the hydraulic machine.…”

Section: Introductionmentioning

confidence: 99%

Cavitation of Multiscale Vortices in Circular Cylinder Wake at Re = 9500

Huang

Stankovic

2021

JMSE

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Cavitation characteristics in the wake of a circular cylinder, which contains multiscale vortices, are numerically investigated via Large Eddy Simulation (LES) in this paper. The Reynolds number is 9500 based on the inlet velocity, the cylinder diameter and the kinematic viscosity of the noncavitation liquid. The Schneer–Sauer (SS) model is applied to cavitation simulation because it is more sensitive to vapor–liquid two-phase volume fraction than the Zwart–Gerber–Belamri (ZGB) model, according to theoretical analyses. The wake is quasiperiodic, with an approximate frequency of 0.2. It is found that the cavitation of vortices could inhibit the vortex shedding. Besides, the mutual aggregation of small-scale vortices in the vortex system or the continuous stripping of small-scale vortices at the edge of large-scale vortices could induce the merging or splitting of cavities in the wake.

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An experimental investigation of hydrodynamic performance, cavitation, and noise of a normal skew B-series marine propeller in the cavitation tunnel

Cited by 27 publications

References 15 publications

Numerical Study of Cavitation Characteristics through Butterfly Valve under Different Regulation Conditions

Numerical Study of Cavitation Characteristics through Butterfly Valve under Different Regulation Conditions

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

Cavitation of Multiscale Vortices in Circular Cylinder Wake at Re = 9500

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