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Cavitation Inception - Crossref

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Last Updated: 06 November 2022

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Scaling of Tip Vortex Cavitation Inception

A practical approach for predicting tip vortex cavitation in the implantation of marine propellers is described. When the local pressure inside the vortex reduces to the fluid's vapor pressure, the tip vortex will be the first time. Three model propeller experiments in simulated full scale wake were carried out in the David Taylor Research Center 36-inch Variable Pressure Water Tunnel. Experimental results have been extensively reviewed and used for tip vortex cavitation inception predictions. Several comparisons between the current forecast algorithm and ship trial results are made.

Source link: https://doi.org/10.5957/attc-1989-004


Relating Trailing Vortex Cavitation Inception To Single Phase Flow Measurements

The single phase and cavitating tip vortex shed by a NACA. 66-209 rounded tip hydrofoil has been investigated. Both the mean and fluctuating single phase vortex core static pressure were measured using Ooi and Acosta's specialized air bubble technique. Variation of axial velocity fluctuation can be as high as 0. 2Uo Core pressure fluctuations, which have been more pronounced than freestream dynamic pressure fluctuations. The rapid development of completely developed trailing vortex cavitation when the cavitation number is reduced below inception is attributable to the small difference in mean core pressure with downstream distance.

Source link: https://doi.org/10.5957/attc-1989-003


Numerical prediction of oil film shear cavitation inception considering groove structure

Given the friction disks' groove pattern, the numerical representation of the oil film flow field is established. The incipient position of oil film shear cavitation under various groove structure parameters is investigated. The area fraction of cavitation inception is directly proportional to the depth and depth of the groove, and is inversely proportional to the section parameter and inclination angle of the groove. This research provides an accurate and reliable method for predicting the oil film shear cavitation inception.

Source link: https://doi.org/10.1177/09544062221104617


Suppression of vortex rope formation and pressure fluctuation using anti-swirl fins in a Francis turbine model at part load condition with cavitation inception point

At part load with cavitation inception, avocatory rope's formation creates pressure variations inside the draft tube of a Francis turbine, which can fail the turbine due to resonance and erosion. The present research investigates the effect of fin sizes and locations on the Francis turbine's internal flow characteristics, as well as the pressure surge. Three cases are investigated in which internal flow physics are compared to DTs with longer fins, shorter fins, and no fins in three cases. Thoma number 0. 266 and guide vane angle have been assigned to PF and PL conditions; see text]. The vortex rope's appearance is minimized by fins on the DT periphery and longer fins that are extending up to the elbow have the lowest strength of the vortex rope. Therefore, energy production is preferable with longer fins due to the safe and stable turbine function.

Source link: https://doi.org/10.1063/5.0097685

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions