A Note On The Scaling Of Tip Vortex Cavitation Inception

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DOI: 10.6119/JMST-012-0831-1 This article now can be cited as

in mind that, the inception of tip vortex cavitation depends not only on cavitation number, but also on Reynolds number as indicated e.g. in reference [2]. This means, if the noise spec-trum in model scale will be extrapolated to those in full scale, the part for unsteady sheet cavitation and tip vortex cavitation must be treated separately.

SHIPBUILDING AND MARINE ENGINEERING MONTHLY 193

Noordzij, L., A note on the scaling of tip vortex cavitation inception 277 233 N.S.M.B. Trial allowances 1976 by H.J. de Jong and H.P. Fransen 279 319 Officier, M.J. and Noordzij, L., The effect of camber on the pressure field of a super-cavitating propeller 273 115 On the directional stability of sliips by R. Ray Nachlinger 270 29

Effects of model size and free stream nuclei on tip vortex

Experimental data also show that tip vortex cavitation inception is sensitive to the available nuclei in the test condition [Liu and Brennen 1998]. Let σif and σim denote the tip vortex cavitation inception number on full-scale and model, respectively. The 19th ITTC cavitation committee [1990] suggested an inception scaling of σ if / σim

International Journal of Acoustics and Vibration

ber is still two orders of magnitude too low for exact scaling. The main complication is in the scaling of tip vortex cavita-tion, where the reduced model-scale Reynolds number causes an increase in the effects of viscosity and delays cavitation in-ception to higher speeds. Results are corrected to full-scale us-

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* lack of agreement of cavitation inception speeds measured with models in water tunnels and those determined at ship scale. Generally, the model prediction is highly non-conservative, yielding cavitation inception speeds which are roughly twice those observed during prototype operation. This lack of scaling of tip vortex inception speed is

Tip Vortex Cavitation Inception Study Using the Surface

inclusion of bubble splitting on the cavitation inception prediction is then investigated. INTRODUCTION Conducting numerical cavitation inception experiments using a distribution of nuclei as in a real liquid has been very successful in providing a numerical tool to study tip vortex cavitation inception and its scaling.

MODELING AND SIMULATION OF MULTIPLE BUBBLE ENTRAINMENT AND

to obtain the three different vortex strength used in this work. Scaling the inlet velocity profile achieves the changes in vortex strength desired. The center of the vortex core (X c,Y c) is defined as the weighted center of vorticity, computed as shown in Eqn. 16, of a plane slice at the bottom of the vortex ring. X c =∑ i X iω 2 i

Propeller Cavitation in Non-Uniform Flow and Correlation with

Johannsen [14] tried to derive distinct scaling laws based on fluid mechanical connections between cavity dynamics, time series of hull pressure and inflow velocity field. The bursting phenomenon of tip vortex cavitation has been investigated by Konno et al. [15] and recognized as a source of large pressure fluctuations.

Article Propeller Cavitation in Non-Uniform Flow and

distinct scaling laws based on fluid mechanical connections between cavity dynamics, time series of hull pressure and inflow velocity field. The bursting phenomenon of tip vortex cavitation has been investigated by Konno et al. [15] and recognized as a source of large pressure fluctuations. Paik et al.

U.S.-ROMANIAN WORKSHOP ON WATER RESOURCES ENGINEERING VOLUME II

International Symposium on Cavitation Inception, The ASME Winter Annual Meeting, New York, NY, December 2-7, 1979. 11 Scale Effects on Various Types of Limited Cavitation, International Symposium on Cavitation Inception, TheASME Winter Annual Meeting, New York, NY, December 2-7, 1979. 11 Cavitation Inception Observations on Six