Traversing field of view and AR-PIV for mid-field wake vortex investigation in a towing tank

Scarano, Fulvio; Wijk, C. van; Veldhuis, L.L.M.

doi:10.1007/s00348-002-0516-6

Cited by 21 publications

(11 citation statements)

References 13 publications

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“…The ability of PIV to measure unstationary vorticity was utilized in the measurement of one of the trailing vortices of a 1:48 model of the Airbus A340-300 (Scarano et al 2002), which made it possible to determine its strength and position over an elongated domain. Adrian et al (2000) used planar PIV to obtain quantitative information on coherent flow structures in turbulent flows, for example, to demonstrate the presence of hairpin vortices in a turbulent boundary layer for Reynolds numbers (based on the momentum-loss thickness θ) between Re θ = 930 and 6,845.…”

Section: Figurementioning

confidence: 99%

Particle Image Velocimetry for Complex and Turbulent Flows

Westerweel

Elsinga

Adrian

2013

Annu. Rev. Fluid Mech.

440

211

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Particle image velocimetry (PIV) has evolved to be the dominant method for velocimetry in experimental fluid mechanics and has contributed to many advances in our understanding of turbulent and complex flows. In this article we review the achievements of PIV and its latest implementations: time-resolved PIV for the rapid capture of sequences of vector fields; tomographic PIV for the capture of fully resolved volumetric data; and statistical PIV, designed to optimize measurements of mean statistical quantities rather than instantaneous fields. In each implementation, the accuracy and spatial resolution are limited. To advance the method to the next level, we need a completely new approach. We consider the fundamental limitations of twopulse PIV in terms of its dynamic ranges. We then discuss new paths and developments that hold the promise of achieving a fundamental reduction in uncertainty. 409

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Section: Figurementioning

confidence: 99%

Particle Image Velocimetry for Complex and Turbulent Flows

Westerweel

Elsinga

Adrian

2013

Annu. Rev. Fluid Mech.

440

211

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“…At higher Reynolds numbers, real model aircraft wing tip vortex velocities were measured by Scarano et al (2002). Typical problems encountered in PIV measurements on tip vortices were shown at the First International PIV Challenge (Stanislas et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Flow field measurement around vortex cavitation

2015

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stage. These involve the smooth transport of vapor into the tip vortex, leading harmful implosions away from the propeller surface. The tip vortex cavity dynamics are not directly related to the propeller rotation rate. The excitation of this cavity often leads to high amplitude broadband pressure fluctuations between the fourth and seventh blade rate frequency (Wijngaarden et al. 2005).To better understand the sound production from vortex cavitation, a model for the waves on a tip vortex cavity was developed and was shown to be able to describe the interface dynamics in detail (Pennings et al. 2015). As a result, a condition could be predicted where a cavity resonance frequency could be amplified to produce high amplitude sound, as reported by Maines and Arndt (1997).The part that remains to be validated is a vortex model for the cavity size and cavity angular velocity. It has been shown that a Lamb-Oseen vortex model poorly estimates the cavity size as a function of cavitation number (Pennings et al. 2015). It is possible that overestimation of the vortex peak azimuthal velocity could have led to an overestimation of the cavity size. The main goal of the present study was to configure a simple low-order vortex model, to serve as an input into a vortex cavity wave dynamics model, to describe the tip vortex resonance frequency. It is based on the following steps.1. Model the tip vortex velocity field without cavitation (further referred to as wetted vortex) 2. Model the cavity size as a function of cavitation number based on wetted vortex properties 3. Show the difference in velocity field around a wetted and cavitating vortex 4. Obtain the cavity angular velocity value that gives the best correlation to the tip vortex cavity resonance frequency Abstract Models for the center frequency of cavitatingvortex 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 loworder 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.

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“…In other cases, aerodynamic studies are conducted with the object moving in a quiescent fluid. This approach is needed for instance to study the flow behind accelerating objects (Coutanceau and Bouard 1977a) or the development of the wake of an aircraft over a large distance (Scarano et al 2002;Von Carmer et al 2008). Furthermore, instructive flow visualizations have been obtained of high-speed flight of a bullet in stagnant air (van Dyke 1982).…”

Section: Introductionmentioning

confidence: 99%