COMPARISON BETWEEN TRIPLE-WIRE AND X-WIRE MEASUREMENT TECHNIQUES IN HIGH INTENSITY TURBULENT SHEAR FLOW.

A new signal analysis algorithm for analyzing voltages of a triple-wire anemometer probe is presented. Jorgensen's cooling law for cylinders inclined to the flow vector is adopted. Two ratios of the three effective cooling velocities are found to determine the directions of velocity vectors in inverting the effective cooling velocities. All possible values of the ratios fall into a realizable domain. Inverted velocity vectors are multiple but a uniqueness domain, within which the one coinciding with the true velocity vector can be singled out, is defined. Samples of linearized voltages were taken in the turbulent shear layer of a 6. 35 cm diameter jet and analyzed by the algorithm. The results appear to support the methodology of the algorithm. The mechanisms that cause some of the samples to reside outside the realizable domain are discussed.