Abstract
A 12-sensor hot-wire probe, capable of simultaneously measuring the velocity and vorticity vectors, is described. The probe is a further step in vorticity and velocity hot-wire measurement technique development, extending the nine-sensor hot-wire probe. Results from tests of the probe performance are presented to show that the velocity field is measured with sufficient accuracy in order to determine the velocity gradients and, therefore, the vorticity vector field. The probe also has been tested in a turbulent boundary layer in order to compare its performance with that of the nine-sensor probe. The advantage of this new probe, compared with the nine-sensor probe, is clearly demonstrated for flow fields with a high ratio of cross stream to streamwise velocity components, as well as for the measurement of higher statistical moments of the turbulence.
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