Screech tones from free and ducted supersonic jetsThe dependence of the instability wave spectrum on azimuthal mode number, the jet to ambient gas temperature ratio, and the jet Mach number is studied. It is shown that the switch of the dominant screech mode (axisymmetric to helical/flapping) as Mach number increases is due to the switch in dominance of the corresponding mode of instability waves. Super-resonance can occur when the feedback loop is powered by the most amplified instability wave. It is suggested that the large amplitude pressure fluctuations and tone in the test cells are generated by super-resonance.
Document ID
19930040825
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Tam, C. K. W. (Florida State Univ. Tallahassee, United States)
Ahuja, K. K. (Georgia Inst. of Technology Atlanta, United States)
Jones, R. R., III (Sverdrup Technology, Inc. Arnold AFB, TN, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Subject Category
Acoustics
Report/Patent Number
AIAA PAPER 93-0732
Meeting Information
Meeting: AIAA, Aerospace Sciences Meeting and Exhibit