.... The variability of these quantities are observed with PIV and the average quantities are compared between LDV and PIV. Developed cavitation is also examined for the leakage vortex. The implication of vortex variability on cavitation inception is discussed. vortex core velocity measurement flow field...

... Research was conducted during the 1997-98 academic year into the porpoising of "V-hulled" planing craft. The purpose of the study was to first correlate the porpoising inception results published by 1952 Webb Institute seniors Day & Haag at a much larger scale, then advance porpoising...

... Laminate construction technology is used to reduce the local angle of attack at the tip of an elliptic foil to delay the inception of tip vortex cavitation. As the angle of attack is increased on the foil, the increased lift causes the tip to flex in a direction that relieves the hydrodynamic...

... head forms which are 5. 0 8, 25.4 and 50.8cm in diameter for speeds ranging up to 15m/s and for a range of cavitation numbers. experiment inception fluid mech cavity brennen headform noise hydrophone frequency schiebe headform cavitation electrode cavitation scaling experiment...

... Selective injection of a drag-reducing polymer solution into the tip vortex region of the blades of an 11.5 inch diameter propeller is seen to be effective in significantly delaying tip vortex cavitation. For well positioned injection ports, the cavitation number at inception was decreased...

... A propeller design procedure incorporating new propeller blade sections has been developed to improve propeller cavitation inception. Two dimensional foil design procedures of Shen and Eppler provide geometry for a specified blade pressure distribution. Advanced propeller lifting surface design...

... of Ooi and Acosta (1983) was employed to measure both the mean and fluctuating single phase vortex core static pressure. Cavitation inception was determined visually. The flow in the vortex core is highly unsteady. The r.m.s. axial velocity fluctuation can be as high as 0.2Uoo Core pressure fluctuations...

... ribbon structure. The core thickness and the wave length of these structures are also discussed. upstream oil & gas cavitation vortice trajectory arndt reservoir characterization inception nucleus numerical simulation simulation cavitation inception green correspond vortex higuchi...

... using a number of flow visualization techniques, laser velocimetry (tip boundary layers) and pressure taps. The downstream tip vortex was measured with a three-component laser velocimeter at a number of streamwise positions with a detailed planar mapping of the flow in the region of cavitation inception...