A Study on the Self-Excited Oscillatin in a Round Jet Impinging upon a Screen : 1st Report. The relation between self-excited tone and velocity fluctuation
抄録
A fine screen is placed vertically to an axisymmetric jet. The diameter of the nozzle exit is 28mm and the exit velocity is 10.4m/s. 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. This self-excited oscillation is produced because sound pressure is fed back so as to exert force on the unstable shear layer near the nozzle exit. It has been recognized that the configuration of the peaks in the sound pressure spectrum reflects that of the peaks in the velocity spectrum.
円形噴流の金網への衝突時における自励振動に関する研究 : 第1報 自励音と速度変動の関係
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