Shedding Phenomenon of Ventilated Partial Cavitation around an Underwater Projectile

Wang, Yiwei; Huang, Chenguang; Du, Tao; Wu, Xianqian; Fang, Xin; Liang, Ning; Yan, Weizhen

doi:10.1088/0256-307x/29/1/014601

Cited by 20 publications

(5 citation statements)

References 15 publications

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“…Once the local pressure in the liquid falls below its saturated vapor pressure, an evaporation process starts, with the gas nuclei in the liquid being developed, to form the so-called cavitating flow [7] . The cavitation is normally accompanied by several undesirable consequences, such as the noise [8] , the vibrations [9] , the destruction of structures [10] , the loss of efficiency and material [11][12] .…”

Section: Introduction mentioning

confidence: 99%

Numerical assessment of the erosion risk for cavitating twisted hydrofoil by three methods

Lei

Cheng

et al. 2021

J Hydrodyn

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In this paper, the large eddy simulation (LES) method in conjunction with the Zwart cavitation model is adopted for the assessment of the erosion risk on a hydrofoil surface. The numerical results are in good agreement with the experiments. On this basis, three methods, namely the intensity function method (IFM), the time-averaged aggressiveness indicators (TAIs) and the gray level method (GLM), are applied for the assessment of the erosion risk. It is shown that the erosion intensity index of the IFM is extremely sensitive to the artificially selected thresholds, which greatly limits the application of the method. The erosion risk predicted by four indicators in the TAIs does not agree well with the experimental results. Further analysis demonstrates that the GLM using the instantaneous pressure field is relatively satisfactory, which can provide a reasonable assessment of the erosion and is not very sensitive to the artificially selected thresholds. To further improve the accuracy of the GLM for the erosion risk prediction, the time-average pressure field is adopted in the GLM for the erosion evaluation. It is suggested that the erosion assessment by using the time-averaged pressure field is in better agreement with the experimental results when compared with that by using the instantaneous pressure field.

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Section: Introduction mentioning

confidence: 99%

Numerical assessment of the erosion risk for cavitating twisted hydrofoil by three methods

Lei

Cheng

et al. 2021

J Hydrodyn

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“…Wang determined the relationship between the speed and position of a re-entry jet and adverse pressure gradient. The results of these studies can be used to predict the speed and cavity length of re-entry jets [30].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Near-wall effect on cloud cavitating flow that surrounds an axisymmetric projectile using large eddy simulation with Cartesian cut-cell mesh method

Wang

Huang

et al. 2018

European Journal of Mechanics - B/Fluids

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Near-wall effect is important for cavitation of flow and vortex structures. These structures are commonly investigated in cavitation of tip-vortex leakage, but are rarely discussed in cloud cavitating flow. In this study, typical experiments and numerical simulation of cloud cavitating flow were conducted near a wall that surrounds an underwater axisymmetric projectile. The experimental observations of cavity development are consistent with numerical results and validate the method's accuracy. Changes in the cavity of the distal and near wall side differ throughout the entire evolution process. The cavity grows faster on the near wall side than on the distal side, whereas the re-entry jet inside the cavity moves slowly toward the shoulder of the model. The strong vortex around the projectile is non-axisymmetric because of the collapsing cavity, which may also affect the cruising stability.

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“…Pham et al 15 performed air injection in the suction side of a hydrofoil to suppress re-entrant flow, and it is found that the unsteadiness of cavitating flow is reduced. Wang et al 16 performed air injection in the unsteady cavitating flows around underwater vehicle, and the influence of air injection on cavity collapse is investigated. Yu et al 17 found that the unsteadiness of cavitating flow is adjusted due to the interaction between air and re-entrant flow.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the influence of air injection on unsteady cloud cavitating flow dynamics

Zhang

Zhao

Wei

et al. 2016

Advances in Mechanical Engineering

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The main purpose of this study was to investigate the influence of air-injection technique on unsteady cloud cavitating flow dynamics. High-speed camera and pressure measurement system are used to record ventilated cavitation images and wall-pressure fluctuation in a convergent-divergent channel, respectively. The measured ventilated cavitation evolution process and corresponding wall-pressure fluctuation are compared with those obtained under non-ventilation condition. The results show that air-injection technique can significantly suppress pressure pulses induced by cavity collapse. Furthermore, by increasing ventilation rate, the time evolution of cavitation tends to be more stable, the wall-pressure fluctuation magnitude is reduced significantly, and the cloud shedding frequency is reduced, which is believed to be related to the interaction between injected air and re-entrant flow.

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Shedding Phenomenon of Ventilated Partial Cavitation around an Underwater Projectile

Cited by 20 publications

References 15 publications

Numerical assessment of the erosion risk for cavitating twisted hydrofoil by three methods

Numerical assessment of the erosion risk for cavitating twisted hydrofoil by three methods

Analysis of Near-wall effect on cloud cavitating flow that surrounds an axisymmetric projectile using large eddy simulation with Cartesian cut-cell mesh method

Experimental study on the influence of air injection on unsteady cloud cavitating flow dynamics

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