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B. Wall, H. Richard (2006)
Analysis methodology for 3C-PIV data of rotary wing vorticesExperiments in Fluids, 40
J. Iversen, V. Corsiglia, S. Park, D. Backhus, R. Brickman (1979)
Hot-Wire, Laser-Anemometer, and Force Measurements of Interacting Trailing VorticesJournal of Aircraft, 16
Swathi Mula, James Stephenson, C. Tinney, J. Sirohi (2011)
Vortex jitter in hover
S. Widnall (1972)
The stability of a helical vortex filamentJournal of Fluid Mechanics, 54
I. Grant (1997)
Particle image velocimetry: A reviewProceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 211
Mahendra Bhagwat, M. Ramasamy (2012)
Effect of tip vortex aperiodicity on measurement uncertaintyExperiments in Fluids, 53
Swathi Mula, James Stephenson, C. Tinney, J. Sirohi (2012)
Dynamical and evolutionary characteristics of the tip vortex from a four-bladed rotor in hover
Preston Martin, J. Leishman, G. Pugliese, S. Anderson (2000)
Stereoscopic PIV Measurements in the Wake of a Hovering Rotor
M. Ramasamy, Ryan Paetzel, Mahendra Bhagwat (2011)
Aperiodicity Correction for Rotor Tip Vortex Measurements
G. Baker, S. Barker, K. Bofah, P. Saffman (1974)
Laser anemometer measurements of trailing vortices in waterJournal of Fluid Mechanics, 65
A. Melling (1997)
Tracer particles and seeding for particle image velocimetryMeasurement Science and Technology, 8
M. Ramasamy, Bradley Johnson, Tyler Huismann, J. Leishman (2009)
Digital Particle Image Velocimetry Measurements of Tip Vortex Characteristics Using an Improved Aperiodicity CorrectionJournal of The American Helicopter Society, 54
I Grant (1997)
55Proceedings of the institution of mechanical engineers, 211
S. Green, A. Acosta (1991)
Unsteady flow in trailing vorticesJournal of Fluid Mechanics, 227
S. Bailey, S. Tavoularis (2008)
Measurements of the velocity field of a wing-tip vortex, wandering in grid turbulenceJournal of Fluid Mechanics, 601
Mahendra Bhagwat, J. Leishman (2000)
Correlation of Helicopter Rotor Tip Vortex MeasurementsAIAA Journal, 38
S. Beresh, J. Henfling, R. Spillers (2010)
Meander of a fin trailing vortex and the origin of its turbulenceExperiments in Fluids, 49
Anand Karpatne, J. Sirohi, Swathi Mula, C. Tinney (2012)
Investigation of Tip Vortex Aperiodicity in Hover
K. Kindler, K. Mulleners, H. Richard, Berend Wall, M. Raffel (2011)
Aperiodicity in the near field of full-scale rotor blade tip vorticesExperiments in Fluids, 50
R. Cucitore, M. Quadrio, A. Baron (1999)
On the effectiveness and limitations of local criteria for the identification of a vortexEuropean Journal of Mechanics B-fluids, 18
W. Devenport, M. Rife, Stergios Liapis, G. Follin (1996)
The structure and development of a wing-tip vortexJournal of Fluid Mechanics, 312
Y. Han, J. Leishman, A. Coyne (1997)
Measurements of the velocity and turbulence structure of a rotor tip vortexAIAA Journal, 35
J. Leishman, A. Baker, A. Coyne (1996)
Measurements of Rotor Tip Vortices Using Three-Component Laser Doppler VelocimetryJournal of The American Helicopter Society, 41
H. Richard, J. Bosbach, A. Henning, M. Raffel, C. Willert, B. Wall (2006)
2C and 3C PIV measurements on a rotor in hover condition
D. Degani, A. Seginer, Y. Levy (1990)
Graphical visualization of vortical flows by means of helicityAIAA Journal, 28
P. Chakraborty, S. Balachandar, R. Adrian (2005)
On the relationships between local vortex identification schemesJournal of Fluid Mechanics, 535
Jinhee Jeong, F. Hussain (1995)
On the identification of a vortexJournal of Fluid Mechanics, 285
T. Thompson, N. Komerath, R. Gray (1988)
Visualization and Measurement of the Tip Vortex Core of a Rotor Blade in HoverJournal of Aircraft, 25
Mahendra Bhagwat, J. Leishman (2000)
Stability Analysis of Helicopter Rotor Wakes in Axial FlightJournal of The American Helicopter Society, 45
J. Westerweel (2000)
Effect of Sensor Geometry on the Performance of PIV Interrogation
James Stephenson, Swathi Mula, C. Tinney, J. Sirohi (2012)
Far Wake Rotorcraft Vortex Tumbling
M. Raffel (2002)
Particle Image Velocimetry: A Practical Guide
C. Tung, S. Pucci, F. Caradonna, H. Morse (1981)
The structure of trailing vortices generated by model rotor blades
J. Hunt, A. Wray, P. Moin (1988)
Eddies, streams, and convergence zones in turbulent flows
A. Landgrebe (1972)
The Wake Geometry of a Hovering Helicopter Rotor and its Influence on Rotor PerformanceJournal of The American Helicopter Society, 17
C. Tinney, M. Glauser, L. Ukeiley (2008)
Low-dimensional characteristics of a transonic jet. Part 1. Proper orthogonal decompositionJournal of Fluid Mechanics, 612
J. Sirohi, Michael Lawson (2012)
Measurement of helicopter rotor blade deformation using digital image correlationOptical Engineering, 51
I. Gursul, W. Xie (2000)
Origin of Vortex Wandering over Delta WingsJournal of Aircraft, 37
L. Jacquin, D. Fabre, P. Geffroy, E. Coustols (2001)
The properties of a transport aircraft wake in the extended near field - An experimental study
J. Leishman (1998)
Measurements of the aperiodic wake of a hovering rotorExperiments in Fluids, 25
C. Ohanian, Gregory McCauley, O. Savaş (2012)
A Visual Study of Vortex Instabilities in the Wake of a Rotor in HoverJournal of The American Helicopter Society, 57
L. Graftieaux, M. Michard, N. Grosjean (2001)
Combining PIV, POD and vortex identification algorithms for the study of unsteady turbulent swirling flowsMeasurement Science and Technology, 12
K. Mcalister (2013)
Rotor Wake Development During the First Revolution
(2004)
Wandering of wing-tip vortex
Dynamical characteristics of tip vortices shed from a 1 m diameter, four-bladed rotor in hover are investigated using various aperiodicity correction techniques. Data are acquired by way of stereo-particle image velocimetry and comprises measurements up to 260° vortex age with 10° offsets. The nominal operating condition of the rotor corresponds to Re c = 248,000 and M = 0.23 at the blade tip. With the collective pitch set to 7.2° and a rotor solidity of 0.147, blade loading (C T/σ) is estimated from blade element momentum theory to be 0.042. The findings reveal a noticeable, anisotropic, aperiodic vortex wandering pattern over all vortex ages measured. These findings are in agreement with recent observations of a full-scale, four-bladed rotor in hover operating under realistic blade loading. The principal axis of wander is found to align itself perpendicular to the slipstream boundary. Likewise, tip vortices trailing from different blades show a wandering motion that is in phase instantaneously with respect to one another, in every direction and at every wake age in the measurement envelope.
Experiments in Fluids – Springer Journals
Published: Oct 4, 2013
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