Characteristics of the Tone Generated by Jet Passing through AxisymmetricCavities

概要

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Experiments have been made of the resonance tone induced by the jet-excitation in the axisymmetric cavity, motivated by applications to the control of the discrete frequency noise in duct systems. The components caused by the tone generation in the cavity models with the length/jet-issued pipe diameter ratio L/d from 1.0 to 4.0 were measured removing the reflection wave from a tail pipe. The results indicate that the periodic peak components occurring in the noise spectra predominate either at the first or the second discrete frequency, generally predominating at second one. It is also shown that Strouhal frequencies of the tone components have little connection with the cavity shapes more than L/d of 2.0 at most, and become lower with increasing of the pipe diameter up to 48mm.
東海大学の論文