Abstract
Vortex shedding in flow over a five-hole probe, used to measure three dimensional flow, excites the probe into vibration which causes measurement errors and acoustically induced structural fatigue of the probe stem. One method of reducing the coherent structure of the shed vortices and thereby reduce the vibration is to place a fin on the probe shaft with the fin free to rotate around the shaft. In a particular five-hole probe application there was no room for a fin so an alternate method of breaking up the coherent structure in the vortices was required. Coiling a wire around the probe was a technique tried using several wire diameters and coil spacings. Vibration levels were measured and analyzed for several wire coil configurations and compared to the vibration reduction achieved by the fin.
