Study on Transonic Tone in an Axisymmetric Supersonic Nozzle |
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Authors: | M. Yonamine S. Jung T. Aoki |
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Affiliation: | Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan |
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Abstract: | This paper describes experimental and numerical works to investigate noise phenomenon in supersonic flow discharged from a convergent-divergent nozzle. The noise phenomenon of flow is generated by an emission of ‘transonic tones’. The results obtained show that the frequency of a transonic tone, that differs from the frequency of a screech tone due to the shock-cell structures in a jet and originates in the shock wave in the nozzle, increases in proportion to the nozzle pressure ratio. The high-order transonic tone has the directivity in the direction of the flow. As for the transonic tone’s frequency, the separated zone was calculated by using a simple flow model considering the propagating perturbation. The results of the model corresponded to the results of this experiment well. |
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Keywords: | Compressible Flow Noise Supersonic Flow Shock Wave and Transonic Resonance |
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