Abstract
The resonance tube is a cylindrical cavity, closed at the downstream end, which is excited to oscillation by a coaxial air-jet.This paper presents the experimental and the theoretical analysis on the unstable resonant phenomenon of the resonance tube with a secondary resonator. This phenomenon is explained by determining the characteristics of the acoustic impedance on this apparatus. Considering that the resonance tube and the secondary resonator are independent of each other, their acoustic impedances are calculated. And when they are set close, the acoustic mutual inductance yields due to the acoustic coupling, and then the impedance of the resonance tube increases. The unstable resonant phenomenon is explained by the calculation of the impedance on the coupling resonators.
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