長方形噴流の発振機構に関する実験的考察

概要

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The self-excited oscillation of a rectangular jet impinging on an edge is investigated experimentally. Normalized power spectra of the pressure fluctuation on the edge surface and those of the sound pressure level are obtained. Since a fundamental oscillating frequency of pressure fluctuation at the proximity of the edge corresponds to that of the nozzle exit, it seems to be transmitted directly to the nozzle exit. So, the feedback path of pressure fluctuation was cut off by setting plates between the edge and the nozzle exit. As a result, the essential oscillating mode disappeared. Next, the jet was excited laterally at the proximity of the nozzle exit. When the frequency of excitation corresponds to that of the essential oscillating mode, similar oscillating phenomenon without cut-off plates appear. Hence, it is found that the oscillating phenomenon is generated by the feedback of pressure fluctuation at the proximity of the edge to that of the nozzle exit.
一般社団法人日本機械学会の論文
1988-04-25