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Acoustic phenomena of open cavity airborne Cassegrainian telescopesA series of large scale wind tunnel experiments were conducted on a gimbal mounted Cassegrainian telescope enclosed in a shroud with various aerodynamic fairings. The optical aperture was open to the airstream, resulting in acoustic inputs to the telescope. Resonance was shown to be dependent on free stream Mach number, internal cavity and external fairing geometry, and the angle of the plane of the opening relative to the free stream direction. Configurations were found which caused low noise and low unsteady internal loads at the expense of decreased view angle. Air injection over the cavity aided in reducing acoustic resonance.
Document ID
19740036080
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Van Kuren, J. T.
(USAF, Flight Dynamics Laboratory, Wright-Patterson AFB Ohio, United States)
Otten, L. J., III
Davis, J. A.
(USAF, Weapons Laboratory, Kirtland AFB N. Mex., United States)
Kyrazis, D.
(USAF, Washington, D.C.; NASA, Ames Research Center Moffett Field, Calif., United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1974
Subject Category
Aerodynamics
Report/Patent Number
AIAA PAPER 74-195
Meeting Information
Meeting: Aerospace Sciences Meeting
Location: Washington, DC
Start Date: January 30, 1974
End Date: February 1, 1974
Sponsors: American Institute of Aeronautics and Astronautics
Accession Number
74A18830
Distribution Limits
Public
Copyright
Other

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