caa a22 4500 60619908X CHVBK 20210128100937.0 cr unu---uuuuu 210128e20151101xx s 000 0 eng 10.1007/s00348-015-2073-9 doi (NATIONALLICENCE)springer-10.1007/s00348-015-2073-9 Flow field measurement around vortex cavitation [Elektronische Daten] [P. Pennings, J. Westerweel, T. van Terwisga] Models for the center frequency of cavitating-vortex induced pressure-fluctuations, in a flow around propellers, require knowledge of the vortex strength and vapor cavity size. For this purpose, stereoscopic particle image velocimetry (PIV) measurements were taken downstream of a fixed half-wing model. A high spatial resolution is required and was obtained via correlation averaging. This reduces the interrogation area size by a factor of 2-8, with respect to conventional PIV measurements. Vortex wandering was accounted for by selecting PIV images for a given vortex position, yielding sufficient data to obtain statistically converged and accurate results, both with and without a vapor-filled vortex core. Based on these results, the low-order Proctor model was applied to describe the tip vortex velocity outside the viscous core, and the cavity size as a function of cavitation number. The flow field around the vortex cavity shows, in comparison with a flow field without cavitation, a region of retarded flow. This layer around the cavity interface is similar to the viscous core of a vortex without cavitation. The Author(s), 2015 Pennings P. Department of Mechanical, Maritime and Materials Engineering, Delft University of Technology, Mekelweg 2, 2628 CD, Delft, The Netherlands aut Westerweel J. Department of Mechanical, Maritime and Materials Engineering, Delft University of Technology, Mekelweg 2, 2628 CD, Delft, The Netherlands aut van Terwisga T. Department of Mechanical, Maritime and Materials Engineering, Delft University of Technology, Mekelweg 2, 2628 CD, Delft, The Netherlands aut Experiments in Fluids Springer Berlin Heidelberg 56/11(2015-11-01), 1-13 0723-4864 56:11<1 2015 56 348 https://doi.org/10.1007/s00348-015-2073-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-2073-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pennings P. Department of Mechanical, Maritime and Materials Engineering, Delft University of Technology, Mekelweg 2, 2628 CD, Delft, The Netherlands aut NATIONALLICENCE 700 1- Westerweel J. Department of Mechanical, Maritime and Materials Engineering, Delft University of Technology, Mekelweg 2, 2628 CD, Delft, The Netherlands aut NATIONALLICENCE 700 1- van Terwisga T. Department of Mechanical, Maritime and Materials Engineering, Delft University of Technology, Mekelweg 2, 2628 CD, Delft, The Netherlands aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/11(2015-11-01), 1-13 0723-4864 56:11<1 2015 56 348