Print Email Facebook Twitter Flow field measurement around vortex cavitation Title Flow field measurement around vortex cavitation Author Pennings, P.C. Westerweel, J. Van Terwisga, T.J.C. Faculty Mechanical, Maritime and Materials Engineering Department Marine and Transport Technology Date 2015-11-07 Abstract 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. To reference this document use: http://resolver.tudelft.nl/uuid:95c528af-1f84-4168-b920-0d4559846d9f Publisher Springer ISSN 0723-4864 Source https://doi.org/10.1007/s00348-015-2073-9 Source Experiments in Fluids, 56, 2015 Part of collection Institutional Repository Document type journal article Rights © 2015 The Author(s)This article is published with open access at Springerlink.com Files PDF Pennings_2015.pdf 1.3 MB Close viewer /islandora/object/uuid:95c528af-1f84-4168-b920-0d4559846d9f/datastream/OBJ/view