Study on Transonic Tone in an Axisymmetric Supersonic Nozzle

• Published in: Journal of thermal science Vol. 19; no. 5; pp. 397 - 401
• Main Authors: Yonamine, M., Jung, S., Aoki, T.
• Format: Journal Article
• Language: English
• Published: Heidelberg SP Science Press 01.10.2010
• Subjects: Classical and Continuum Physics; Engineering Fluid Dynamics; Engineering Thermodynamics; Heat and Mass Transfer; Physics; Physics and Astronomy; 保险计划; 冲击频率; 气流噪声; 流动方向; 细胞结构; 超音速喷管; 跨音速; 轴对称; Shock Wave and Transonic Resonance; Supersonic Flow; Noise; Compressible Flow
• ISSN: 1003-2169; 1993-033X
• DOI: 10.1007/s11630-010-0400-2

This paper describes experimental and numerical works to investigate noise phenomenon in supersonic flow dis- charged 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 con- sidering the propagating perturbation. The results of the model corresponded to the results of this experiment well.