噴流-円柱発振系の制御

概要

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Control of the edge tone generated by a two-dimensional jet impinging on a circular cylinder was attempted by three methods: (i) inclining the axis of the circular cylinder with respect to the exit of the jet-producing nozzle; (ii) displacing the center of the cylinder in the direction normal to the longitudinal center line of the jet; (iii) inserting a thin circular cylinder at the midspan of the exit of the nozzle, the axis of the cylinder being normal to the spanwise direction of the nozzle. All three methods were foud to be effective in both eliminating the edge tone and reducing its sound pressure level (SPL). Those critical values of the angle of inclination, the displacement distance, and the diameter of the controlling cylinder at which the edge tone was eliminated were presented. The SPL was also given as a function of the above parameters. Effectiveness of these methods was strongly dependent on the issuing velocity of the jet.
一般社団法人日本機械学会の論文
1991-10-25