Experimental investigation of cavitation-induced erosion around a surface-mounted bluff body

Jahangir, Saad; Ghahramani, Ebrahim; Neuhauser, Magdalena; Bourgeois, Sébastien; Bensow, Rickard; Poelma, Christian

doi:10.1016/j.wear.2021.203917

Cited by 17 publications

(10 citation statements)

References 28 publications

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“…According to the research conclusions of most scholars, the smaller the cavitation number σ is, the more obvious the cavitation phenomenon is, and the larger the cavitation number is, the weaker the cavitation phenomenon is. [25][26][27] The experimental results are a series of cavitation images at different times taken by high-speed photography. The images are processed in gray to analyze the cavitation flow characteristics.…”

Section: Experimental Process and Cavitation Characterizationmentioning

confidence: 99%

“…The experimental operation conditions of different cavitation numbers are shown in Table 1. According to the research conclusions of most scholars, the smaller the cavitation number σ is, the more obvious the cavitation phenomenon is, and the larger the cavitation number is, the weaker the cavitation phenomenon is 25–27 …”

Section: Cavitation Experiments and Numerical Modelmentioning

confidence: 99%

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Experiment and numerical simulation investigation on cavitation evolution and damage in the throttling section of pressure reducing valve

Duan

Wang

et al. 2022

Energy Science & Engineering

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For the phenomenon of widespread and serious cavitation damage in the throttling section of pressure reducing valve under high temperature and high pressure in the chemical technology process of petroleum and coal, according to actual coordination structure widely applied between the valve core and valve seat, the cavitation throttling section with symmetrical contraction and expansion was made, and the visualized cavitation water tunnel experimental apparatus was designed and constructed. The cavitation evolution process with time under different cavitation numbers σ was recorded by the highspeed photography, the variation law of cavitation damage length and area with time was investigated by using aluminum film as cavitation damage carrier. Based on the experimental cavitation characteristic length L*, the evaporation coefficient F v , and condensation coefficient F c in the Zwart-Gerber-Belamri cavitation numerical model were modified, and the cavitation damage region was predicted by the gas phase condensation rate of numerical simulation. The results show that with the decrease of cavitation number, the characteristic length of cavitation strip increases; the cavitation characteristic length fluctuates greatly at σ = 1.22, and there are cavitation cloud periodic formation, shedding, collapse, and disappearance at the tail of the cavitation strip on the upper valve seat; the cavitation damage length of the upper and lower valve seat remains unchanged with time, and the cavitation damage area increases approximately linearly with time; the initial position and length of cavitation damage predicted by the gas phase condensation rate are basically consistent with the experimental results, which verifies the accuracy of the modified numerical simulation.

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Section: Experimental Process and Cavitation Characterizationmentioning

confidence: 99%

Section: Cavitation Experiments and Numerical Modelmentioning

confidence: 99%

Experiment and numerical simulation investigation on cavitation evolution and damage in the throttling section of pressure reducing valve

Duan

Wang

et al. 2022

Energy Science & Engineering

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“…Present research on bluff body aerodynamics by various authors has been done in various aspects. The collapsing behavior of cavitation, which leads to erosion and Experimental investigation of cavitation over a surfacemounted bluff body done by 9 and numerical simulations of bluff bodies using different URANS turbulence models were compared by 10 . Analysis of heat transfer around bluff bodies with variable inlet turbulent intensity and surface pressure on wall-mounted cubes in turbulent boundary layers with various turbulence model was done by [11][12][13] .…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of flow over a cube-shaped bluff body: An aerodynamic approach

Bangalee

Faruque

Lorenzini

et al. 2023

Preprint

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A body which tends to block the flow is a bluff body. Flow investigation over a cube shaped bluff body is a matter of interest in building aerodynamics and vehicle aerodynamics for its general shape. Several CFD methods used earlier to read the complex flow behavior around a cube. In this article, flow behavior over a cube shaped bluff body is computed numerically at Reynold’s number 40000. Four turbulence models have been used to capture the complex flow behavior around the cube and some aerodynamic properties like the drag force co-efficient and effects of angle of attack is also investigated. The three-dimensional viscous air flow is assumed as steady, incompressible and turbulent. A structured hexahedral mesh topology is generated to mesh the three-dimensional cube including the surrounding domain. A grid independent finite volume upwind scheme is used to solve the flow equations. The results are compared with previous experimental data and with a recent work. The drag force coefficient, Cd of the cube is compared with the conventional Cd of a cube. The results give a good agreement with the available experimental result for RNG k-ε and k-ω SST turbulence model. The variation of the velocity profile, pressure coefficient and the change of drag force co-efficient are computed in a basis of the angle of attack at 0° ≤ α ≤ 15° and discussed in details. This research can help to find the flow behavior like separation and reattachment of a cube including aerodynamic characteristics like airflow distribution and drag reduction.

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“…The emergence of tip vortex cavitation is usually accompanied by a significant increase in noise radiation and large pressure fluctuations of the ship hulls, which influences the comfort level of passenger liners and the health of marine animals (Duarte et al 2021). In addition, tip vortex cavitation also leads to a reduction of propulsion efficiency and possible erosion at the surrounding surface of the bubble collapse (Jahangir et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Dynamics of cavitating tip vortex

Wang

Shao

2023

J. Fluid Mech.

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The three-dimensional dynamic behaviour of a tip vortex generated by a NACA $66_2$ -415 hydrofoil is investigated under wetted flow and cavitating conditions using time-resolved tomographic particle image velocimetry. Two main cavitation modes are studied, namely the breathing and double-helical modes. The time-averaged flow field consists of a system of two streamwise vortices for all three conditions. The shape of the tip vortex resembles that of the cavitation mode, instead of a circular cylinder. Multi-scale vortical structures are captured in the instantaneous flow field. The surface oscillation of the cavity contributes to the growth of Kelvin–Helmholtz instability over the tip vortex, leading to the onset of hairpin vortices. Stronger spanwise interaction between the tip vortex and flow separation of the hydrofoil is produced by cavitation, further intensifying the perturbation growth. The proper orthogonal decomposition analysis gives insight into the relationship between cavity oscillation and vortex instability. Two major types of unstable modes of the tip vortex are obtained, leading to serpentine centreline displacement and elliptical deformation motion. The selection of the dominant unstable mode is associated with cavity surface oscillation. For the wetted flow condition, the displacement mode dominates the growth of vortex perturbation, while for breathing mode cavitation, the most energetic unstable mode changes into an elliptical deformation pattern, the disturbance energy of which is negligible in the wetted flow condition. Consistency is found between the peak frequency of the deformation mode and the cavity resonance frequency, indicating the contribution of cavity oscillation to the disturbance growth and breakdown of the tip vortex.

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Experimental investigation of cavitation-induced erosion around a surface-mounted bluff body

Cited by 17 publications

References 28 publications

Experiment and numerical simulation investigation on cavitation evolution and damage in the throttling section of pressure reducing valve

Experiment and numerical simulation investigation on cavitation evolution and damage in the throttling section of pressure reducing valve

Numerical investigation of flow over a cube-shaped bluff body: An aerodynamic approach

Dynamics of cavitating tip vortex

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