金網に衝突する噴流せん断層の自励振動

概要

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This paper is conerned with the self-excited oscillation in a shear layer of an axisymmetric jet when a fine screen is placed normal to the axis of the jet. The diameter of the nozzle exit is 28 mm and the exit velocity is 10.4 m/s corresponding to Reynolds number 1.99×10^4. Screens with three different mesh sizes are employed. In the experiment the screen is moved in the direction of the jet axis. The shear layer starts to oscillate periodically and simultaneously a pure tone is generated due to the impingement of the jet upon the screen. The frequency varies in the same way as in the jetring system. It is recognized that the configuration of the peaks in the velocity spectrum reflects that of the peaks in the sound spectrum. After passing through the screen, the periodic oscillation in the velocity remains at the location twice the nozzle diameter away from the screen.
一般社団法人日本機械学会の論文
1996-07-25