Abstract
An experiment to investigate the tones produced by the generation and shedding of periodic vortices in a tube was designed, constructed, and implemented as a student project in a senior laboratory course. A 0.102-m-diam by 0.762-m-long lucite tube was installed in a subsonic wind tunnel; the longitudinal axis of the tube was located streamwise with the mean flow, laterally centered in the test section, 0.178 m above the floor. Two lucite rings, with minimal clearance at the tube inside diameter and each having inside diameters of 0.0762 m, were connected inside the tube. One of the rings was at the tube inlet plane, while the other was slightly downstream, at a location which could be varied. A microphone was attached to the tube near the exit plane and connected to a PC which incorporated a data acquisition system. Airflow through the wind tunnel was varied until tones were heard, and the air velocities and frequencies of the tones were recorded. Results of the data analysis indicated that the frequency of vortex shedding, at the measured air velocity and ring separation, was in agreement with the natural frequency of the tube, for each of the audible tones.
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