This paper presents previous and recent results obtained by the authors concerning the modification of the tip vortex cavitation of a finite span hydrofoil by drag-reducing polymer solutions. Experiments were conducted with homogeneous solutions and with semidilute solutions ejected at the tip of the wing. Measurements of the onset cavitation number for tip vortex cavitation, hydrodynamic forces on the hydrofoil and tangential velocities in the tip vortex have been conducted. The results show that tip vortex cavitation is inhibited in all cases but for different reasons. In homogeneous polymer solutions the lift of the hydrofoil, and hence the circulation, is considerably reduced leading to a less intense vortex as shown by tangential velocity measurements. With semidilute polymer solution ejections there is no noticeable change of the hydrodynamic forces but a significant modification of the tangential velocities in the core region. The mechanism for tip vortex cavitation inhibition is thus completely different in these two situations.
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June 1989
Research Papers
Tip Vortex Cavitation Inhibition by Drag-Reducing Polymer Solutions
D. H. Fruman,
D. H. Fruman
Groupe Phe´nome`nes d’Interface, Ecole Nationale Supe´rieure de Techniques Avance´es, 91120 Palaiseau, France
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S. S. Aflalo
S. S. Aflalo
Groupe Phe´nome`nes d’Interface, Ecole Nationale Supe´rieure de Techniques Avance´es, 91120 Palaiseau, France
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D. H. Fruman
Groupe Phe´nome`nes d’Interface, Ecole Nationale Supe´rieure de Techniques Avance´es, 91120 Palaiseau, France
S. S. Aflalo
Groupe Phe´nome`nes d’Interface, Ecole Nationale Supe´rieure de Techniques Avance´es, 91120 Palaiseau, France
J. Fluids Eng. Jun 1989, 111(2): 211-216 (6 pages)
Published Online: June 1, 1989
Article history
Received:
March 18, 1988
Online:
October 26, 2009
Citation
Fruman, D. H., and Aflalo, S. S. (June 1, 1989). "Tip Vortex Cavitation Inhibition by Drag-Reducing Polymer Solutions." ASME. J. Fluids Eng. June 1989; 111(2): 211–216. https://doi.org/10.1115/1.3243625
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