Journal of Fluid Mechanics

Laser anemometer measurements of trailing vortices in water

G. R.  Baker a1, S. J.  Barker a1, K. K.  Bofah a1 and P. G.  Saffman a1
a1 Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena

Article author query
baker gr   [Google Scholar] 
barker sj   [Google Scholar] 
bofah kk   [Google Scholar] 
saffman pg   [Google Scholar] 


A series of measurements of trailing vortices behind lifting hydrofoils is described. These measurements were made in the Caltech Free-Surface Water Tunnel, using a laser-Doppler velocimeter to measure two components of velocity in the vortex wake. Two different model planforms were tested, and measurements were made at several free-stream velocities and angles of attack for each. Velocity profiles were measured at distances downstream of the model of from five to sixty chord lengths. These measurements are the first results of a continuing experimental programme.

In § 3 of this paper, the theory of trailing vortices is discussed. The effects of ‘vortex wandering’ upon the measurements are computed, and the corrected results are seen to be in reasonable agreement with the theory.

(Published Online March 29 2006)
(Received October 10 1973)