円形噴流せん断層の自励振動に伴うロックイン現象(流体工学, 流体機械)

概要

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The self-sustained oscillation of the shear layer occurs in a round jet impinging on a ring placed coaxially. In the case of the finite length pipe instead of the ring, the oscillating frequency of the shear layer is locked in to the resonant frequency of the pipe in frequency, when both the frequencies approach each other. This study aims at getting a clearer understanding of the lock-in phenomenon in round jet-body system. The experiments are practiced for the four cases. In the two cases a resonator like a pipe is located downsteram to the nozzle exit, in the other two cases a resonator consists of a part of the nozzle with a ring downstream. As a result of the experiments, it has become clear that the lock-in phenomenon takes place in all the cases, but the intensities of the lock-in and the generating resonance are different, depending on whether a resonator is located downstream of the nozzle exit or at the nozzle.
一般社団法人日本機械学会の論文
2002-05-25