An acoustic approach to determine tip vortex cavitation inception for an elliptical hydrofoil considering nuclei-seeding

Song, Mingtai; Xu, Lianghao; Peng, Xiaoxing; Tang, Denghai

doi:10.1016/j.ijmultiphaseflow.2016.12.008

Cited by 30 publications

(8 citation statements)

References 20 publications

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“…The Rayleigh-Plesset equation, the bubble radius governing equation of bubble dynamics, is derived by the following process. 29 The radial direction velocity potential (f) at point A in Figure 7 is given by equation (9), and the radial direction velocity (u) derived there from is equation (10).…”

Section: Bubble Dynamics Analysismentioning

confidence: 99%

“…After substituting equations (9) and (10) into the unsteady Bernoulli equation written as equation (11) and deriving the equation at the bubble surface (r = R), it is derived as equation (12).…”

Section: Bubble Dynamics Analysismentioning

confidence: 99%

“…8 studied cavitation for various wing shapes and also found that cavitation numbers were affected by Reynolds numbers. Song et al 9 confirmed through experiments that the cavitation bubble density affects the cavitation inception. Park and Seong 10 found that an extrapolation of the model size to the cavitation noise could be applied.…”

Section: Introductionmentioning

confidence: 95%

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Establishment of cavitation inception speed judgment criteria by cavitation noise analysis for underwater vehicles

Jeong

Hong

Song

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part M:

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Cavitation occurs on objects that move underwater at high speeds, and it is accompanied by an increase in hull vibrations, a reduction in propulsion performance, and an increase in noise that is important for warships and submarines. Of the various types of cavitations, tip vortex cavitations (TVC) are the earliest occurring and are considered the most important in terms of cavitation inception speed (CIS). This study predicts the cavitation inception speed by conducting cavitation noise analyses. The trend of the noise according to the cavitation numbers before and after CIS was analysed, and the quantitative criteria to determine the CIS were presented through established procedures. The CIS value obtained through the analysis was verified by comparing it against the value obtained experimentally. The methods used to analyse the cavitation inception speed are developed using bubble dynamics for cavitation noises. First, flow-field information was obtained downstream of the wing to estimate the external force acting on the bubbles, and this was used to calculate the behaviour of the cavitation bubbles. The bubble dynamics analyses were performed for each cavitation nuclei by Lagrange approach to calculate the behaviour of the bubbles. The number of cavitation nuclei was calculated based on the density function with random placement upstream of the wing. The cavitation noise was analysed for various cavitation numbers, and the tendency of the noise generated for each case was investigated. The noise analysis results and the CIS predictions were compared and verified with the measured values in the Large Cavitation Tunnel (LCT) of the Korea Research Institute of Ship & Ocean Engineering (KRISO). Using these results, the effect of the tip vortex cavitation on the total flow noise was analysed, and CIS determination criteria using noise values was validated and established.

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Section: Bubble Dynamics Analysismentioning

confidence: 99%

Section: Bubble Dynamics Analysismentioning

confidence: 99%

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Establishment of cavitation inception speed judgment criteria by cavitation noise analysis for underwater vehicles

Jeong

Hong

Song

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part M:

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“…The cavitation inception point is usually determined by visual observations of cavitation appearance [8]. Recently, acoustic measurement schemes have been utilized as another alternative to detect the cavitation inception by using a signal analysis [13][14][15]. However, as discussed in Asnaghi et al [16], since all relevant flow features cannot be measured in the experimental approaches because of small scales of flow dynamics, numerical simulations can be used as a complementary tool to obtain further insights into tip vortex properties [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Tip Vortex Cavitation Inception on a Foil

Park

Kim

Paik³

et al. 2021

Applied Sciences

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In this paper, the inception of tip vortex cavitation in weak water has been predicted using a numerical simulation, and a new scaling concept with variable exponent has also been suggested for cavitation inception index. The numerical simulations of the cavitating flows over an elliptic planform hydrofoil were performed by using the RANS approach with a Eulerian cavitation model. To ensure the accuracy of the present simulations, the effects of the turbulence model and grid resolution on the tip vortex flows were investigated. The turbulence models behaved differently in the boundary layer of the tip region where the tip vortex is developed, which resulted in different pressure and velocity fields in the vortex region. Furthermore, the Reynolds stress model for the finest grid showed a better agreement with the experimental data. The tip vortex cavitation inception numbers for the foil, predicted by using both wetted and cavitating flow simulation approaches, were compared with the measured cavitation index values, showing a good correlation. The current cavitation scaling study also suggested new empirical relations as a function of the Reynolds number substitutable for the two classic constant scaling exponents. This scaling concept showed how the scaling law changes with the Reynolds number and provided a proper scaling value for any given Reynolds numbers under turbulent flow conditions.

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“…Occurrence of tip vortex cavitation (TVC) in axial turbines, pumps and marine propellers can lead to a severe erosion of the impeller blades and the stationary parts of the machine, with a significant increase in maintenance costs. In most of the cases, TVC is the first type of cavitation that appears in the machine [1,2,3,4] and results in extensive noise emissions and structural vibrations [5]. McCormick [6] investigated the role of the boundary layer on TVC and stated that the size of the viscous core of a tip vortex scales with the boundary layer thickness on the pressure side of hydrofoils.…”

Section: Introductionmentioning

confidence: 99%

Effect of Gas Content on Tip Vortex Cavitation

Amini¹,

Reclari²,

Sano³

et al. 2018

Proceedings of the 10th International Symposium on Cavitation (CAV2018)

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Occurrence of tip vortex cavitation (TVC) is a common problem in axial hydraulic machines. The behavior of this type of cavitation is so sensitive to variations in the flow parameters and the gas content level of water. Regarding this, we have investigated TVC generated by an elliptical hydrofoil with NACA-16020 cross-section in the high-speed cavitation tunnel of EPFL. We measured the cavitation incipience and desinence thresholds for different flow conditions as well as various gas content levels of between 50 and 100 % oxygen saturation at 18 °C. We observed that the disappearance threshold of TVC increases with the gas content level, which is an indication of the fact that once the cavitation develops in the tip vortex, the dissolved gas in the surrounding supersaturated liquid diffuses into the cavity. Moreover, we found that the extent to which the desinence is delayed depends on the incidence angle and the upstream flow velocity; the parameters that determine the characteristics of the boundary layer on the hydrofoil. According to the flow visualization results, we argue that this gaseous cavitation is enhanced when a laminar separation bubble is formed on the suction side of the hydrofoil.

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An acoustic approach to determine tip vortex cavitation inception for an elliptical hydrofoil considering nuclei-seeding

Cited by 30 publications

References 20 publications

Establishment of cavitation inception speed judgment criteria by cavitation noise analysis for underwater vehicles

Establishment of cavitation inception speed judgment criteria by cavitation noise analysis for underwater vehicles

Numerical Study on Tip Vortex Cavitation Inception on a Foil

Effect of Gas Content on Tip Vortex Cavitation

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