Hostname: page-component-78c5997874-8bhkd Total loading time: 0 Render date: 2024-11-14T05:22:32.676Z Has data issue: false hasContentIssue false
  • English
  • Français

Flow visualisation of the orthogonal blade-vortex interaction using particle image velocimetry

Published online by Cambridge University Press:  04 July 2016

J. M. Early ,
R. B. Green  and
F. N. Coton
J. M. Early
Affiliation:
Department of Aerospace Engineering, University of Glasgow
R. B. Green
Affiliation:
Department of Aerospace Engineering, University of Glasgow
F. N. Coton
Affiliation:
Department of Aerospace Engineering, University of Glasgow
Get access Rights & Permissions [Opens in a new window]

Abstract

The flow field produced by the orthogonal blade-vortex interaction (BVI) was examined through the application of a particle image velocimetry (PIV) technique, and acquisition of comparative unsteady surface pressure measurements. The velocity vector maps obtained revealed a significant radial flow from the vortex core after severing, in the form of an outward flow from the core when the flow is directed towards the surface (lower), and inward when directed away (upper). With progression of the vortex over the chord of the blade, the interaction led to a decrease in peak vorticity levels on the lower surface, but a steady level was maintained on the upper surface. Assessment of the effect of the interaction on the out-of-plane mass flux was performed through calculation of the divergence, revealing that there is no further variation in the axial flow on either side of the blade after the initial cut.

Type
Research Article
Information
The Aeronautical Journal , Volume 106 , Issue 1057 , March 2002 , pp. 137 - 145
Copyright
Copyright © Royal Aeronautical Society 2002 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1 Green, R.B. and Doolan, C.J. PIV measurements of the orthogonal blade-vortex interaction, 1999, Paper 136, Third International Work shop on PIV, Santa Barbara, USA, September 1999.Google Scholar
2 Howe, M.S. On the unsteady surface forces, and sound produced by the normal chopping of a rectilinear vortex, J Fluid Mech, 1989, 206, pp 131–153.Google Scholar
3 Krishnamoorthy, S. and Marshall, J.S. An experimental investigation of ‘vortex shocks’, Phys Fluids A, 1994, 6, (11).Google Scholar
4 Marshall, J.S. and Yalamanchili, R. Vortex cutting by a blade, part II: computations of vortex response, AIAA J, 1994, 32, (7), pp 1428–1436.Google Scholar
5 Marshall, J.S. and Grant, J.R. Penetration of a blade into a vortex core: vorticity response and unsteady blade forces, J Fluid Mech, 1996, 306, pp 83–109.Google Scholar
6 Marshall, J.S. Vortex cutting by a blade, part I: general theory and a simple solution, AIAA J, 1994, 32, (6), pp 1145–1150.Google Scholar
7 Marshall, J.S., and Krishnamoorthy, S. On the instantaneous cutting of a columnar vortex with non-zero axial flow, J Fluid Mech, 1997, 351, pp 41–74.Google Scholar
8 Lee, J.A., Burgoraf, O.R. and Conlisk, A.T. On the impulsive blocking of a vortex jet, J Fluid Mech, 1997, 369, pp 301–331.Google Scholar
9 Green, R.B., Doolan, C.J. and Cannon, R.M. Measurements of the orthogonal blade-vortex interaction using a particle image velocimetry technique, Exp Fluids, 2000, 29, pp 369–379.Google Scholar
10 Copland, C.M. The Generation of Transverse and Longitudinal Vortices in Low-speed Wind Tunnels, 1997, PhD Thesis, Department of Aerospace Engineering, University of Glasgow, UK.Google Scholar
11 Doolan, C.J., Green, R.B., Coton, F.N. and Galbraith, R.A.McD. The orthogonal blade-vortex interaction experimental programme at the University of Glasgow, 2000, 26th European Rotorcraft Forum, The Hague, September 2000.Google Scholar
12 Copland, C.M., Coton, F.N. and Galbraith, R.A.McD. A study of heli copter tail rotor interaction: phase 1 - proof of concept, 1998, 24th European Rotorcraft Forum, Marseilles, France.Google Scholar
13 Raffel, M., Willert, C. and Kompenhaus, J. Particle Image Velocimetry, 1998, Springer-Verlag.Google Scholar
14 Adrian, R.J. Particle-imaging techniques for experimental fluid mechanics, Annual Rev Fluid Mech, 1991, 23, pp 261–304.Google Scholar
15 Noguiera, J., Lecouna, A. and Rodriguez, P.A. Data validation, false vector correction and derived magnitudes calculation on PIV data, 1997, Meas Sci Tech, 8, pp 1493–1501.Google Scholar