Passive control of unsteady-wing tip vortex via a slender half-delta wing in both reverse and regular configurations

Passive control of unsteady-wing tip vortex via a slender half-delta wing in both reverse and... The passive control of the tip vortex generated by an oscillating NACA 0012 wing via a tip-mounted half-delta wing, in both regular and reverse configurations, was investigated experimentally at Re = 2.45 × 105. Velocity and vorticity measurements, performed using a miniature triple hot-wire probe, show that vortex breakdown occurred when the regular half-delta wing (HDW) was mounted, but not for the reverse half-delta wing (RHDW) configuration. The HDW vortex breakdown led to a rapidly diffused tip vortex, suggesting an enhanced wake-vortex decay. For the RHDW wing configuration, the tip vortex remained concentrated but had a smaller size and also a weaker strength and rotation compared to the oscillating baseline wing. In addition, the vortex center of the oscillating RHDW wing-generated tip vortex was also found to be greatly displaced, especially in the transverse direction, which could translate into an increased blade-vortex-impingement miss distance and, as a result, an alleviated blade-vortex interaction. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Passive control of unsteady-wing tip vortex via a slender half-delta wing in both reverse and regular configurations

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2013 by Springer-Verlag Berlin Heidelberg
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-013-1564-9
Publisher site
See Article on Publisher Site

Abstract

The passive control of the tip vortex generated by an oscillating NACA 0012 wing via a tip-mounted half-delta wing, in both regular and reverse configurations, was investigated experimentally at Re = 2.45 × 105. Velocity and vorticity measurements, performed using a miniature triple hot-wire probe, show that vortex breakdown occurred when the regular half-delta wing (HDW) was mounted, but not for the reverse half-delta wing (RHDW) configuration. The HDW vortex breakdown led to a rapidly diffused tip vortex, suggesting an enhanced wake-vortex decay. For the RHDW wing configuration, the tip vortex remained concentrated but had a smaller size and also a weaker strength and rotation compared to the oscillating baseline wing. In addition, the vortex center of the oscillating RHDW wing-generated tip vortex was also found to be greatly displaced, especially in the transverse direction, which could translate into an increased blade-vortex-impingement miss distance and, as a result, an alleviated blade-vortex interaction.

Journal

Experiments in FluidsSpringer Journals

Published: Jun 23, 2013

References

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