Abo Bibliothek: Guest
Digitales Portal Digitale Bibliothek eBooks Zeitschriften Referenzen und Berichte Forschungssammlungen
Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Druckformat: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v14.i1.40
pages 53-66

VISUALIZING VORTEX FORMATION IN THE WAKES OF TURBINE BLADES AND OSCILLATING AEROFOILS

J. P. Gostelow
Department of Engineering, University of Leicester, UK
M. F. Platzer
AeroHydro R&T Associates, Pebble Beach, CA, USA
W. E. Carscallen
Institute for Aerospace Research, National Research Council, 1500 MontreaL Road Ottawa, ON, K1A 0R6, Canada
J. C. S. Lai
The University of New South Wales at ADFA, Canberra, Australia

ABSTRAKT

Similarities between anomalous vortex shedding from blunt trailing-edged transonic turbine nozzle blades and from oscillating plunging aerofoils were investigated. Whereas under subsonic conditions the turbine nozzle cascade shed vortices in a conventional von Kármán vortex-street wake, under transonic conditions a variety of different shedding configurations were observed with vortices shedding and pairing in different ways. Oscillating aerofoils were investigated in sinusoidal heaving motion in a water tunnel and a similar range of interesting wake vortex configurations was encountered. The established field of vortex-induced vibration has provided a developed classification scheme for the phenomena observed. The paper has brought together three previously unrelated fields of investigation and, by showing that the three are essentially related, has provided the basis for a new synthesis. The experiments were served well by the use of schlieren, including a novel use in conjunction with the hydraulic analogy, by the use of dye in a water tunnel and by computational work used to provide further interpretation of the observations.