Insight into tip vortex cavitation using velocity field measurements

摘要

Statistics of tip vortex core pressure are estimated from instantaneous Stereo PIV measurements of the velocity field. The tip vortex was generated by a rectangular planform (aspect ratio 2), elliptically-loaded fin with a NACA66 foil shape. A set of 500 velocity field realizations were acquired at each of three angles of attack. Estimates of pressure for each measured velocity field were computed using a finite-element scheme that minimized error propagation from the measured velocity field. Histograms of core pressure show that the mean core pressure followed expected scaling with vortex strength, and that the width of the distribution is inversely proportional to vortex strength.