NDLI: Aerodynamic detuning analysis of an unstalled supersonic turbofan cascade

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Aerodynamic detuning analysis of an unstalled supersonic turbofan cascade

Content Provider	NASA Technical Reports Server (NTRS)
Author	Hoyniak, D. Fleeter, S.
Copyright Year	1985
Description	An approach to passive flutter control is aerodynamic detuning, defined as designed passage-to-passage differences in the unsteady aerodynamic flow field of a rotor blade row. Thus, aerodynamic detuning directly affects the fundamental driving mechanism for flutter. A model to demonstrate the enhanced supersonic aeroelastic stability associated with aerodynamic detuning is developed. The stability of an aerodynamically detuned cascade operating in a supersonic inlet flow field with a subsonic leading edge locus is analyzed, with the aerodynamic detuning accomplished by means of nonuniform circumferential spacing of adjacent rotor blades. The unsteady aerodynamic forces and moments on the blading are defined in terms of influence coefficients in a manner that permits the stability of both a conventional uniformally spaced rotor configuration as well as the detuned nonuniform circumferentially spaced rotor to be determined. With Verdon's uniformly spaced Cascade B as a baseline, this analysis is then utilized to demonstrate the potential enhanced aeroelastic stability associated with this particular type of aerodynamic detuning.
File Size	1330134
Page Count	26
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19850018359
Archival Resource Key	ark:/13960/t1vf1q84w
Language	English
Publisher Date	1985-03-21
Access Restriction	Open
Subject Keyword	Aerodynamics Structural Design Boundary Value Problems Inlet Flow Aerodynamic Stability Turbofan Aircraft Rotor Blades Turbomachinery Harmonic Oscillation Flow Distribution Unsteady Aerodynamics Flutter Mathematical Models Aeroelasticity Leading Edges Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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