Author: James ScheimanPublisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 40
Book Description
Acoustic Measurements of a Large Cavity in a Wind Tunnel
Author: James ScheimanPublisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 40
Book Description
Acoustic Measurements of a Large Cavity in a Wind Tunnel
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781726014397
Category :
Languages : en
Pages : 38
Book Description
Acoustic measurements were made with inside and far-field microphones. Correlation of measured frequencies with available theories indicates that existing theories are applicable over a broader range than previously shown. The cavity configuration with a partial covering downstream amplified tonal intensities. The frequency of the tones depended on cavity size, not on cavity open area. Introducing upstream disturbances decreased the amplitude of the cavity tones. Scheiman, J. Langley Research Center NASA-TM-78658, L-12022 RTOP 505-10-23-05...
Cavity Unsteady-Pressure Measurements at Subsonic and Transonic Speeds
Author: Maureen B. TracyPublisher:
ISBN:
Category : Aerodynamics, Transonic
Languages : en
Pages : 84
Book Description
Scientific and Technical Aerospace Reports
Author: Monthly Catalog of United States Government Publications
Author: United States. Superintendent of DocumentsPublisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1228
Book Description
February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index
R & D Abstracts
Author: Technology Reports Centre (Great Britain)Publisher:
ISBN:
Category :
Languages : en
Pages : 218
Book Description
NASA Technical Paper
Author: Monthly Catalogue, United States Public Documents
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 832
Book Description
NASA Technical Memorandum
Author: Cavity Oscillation in Cruise Missile Carrier Aircraft
Author: Harold W. BartelPublisher:
ISBN:
Category : Aerodynamic load
Languages : en
Pages : 154
Book Description
This report discusses cavity oscillation in general, and particularly the problem of cavity oscillation in the missile bays of cruise missile carrier aircraft during missile launch. The missile bay configurations analyzed ranged from the complete interior volume of a large transport aircraft, to the bomb bay of a conventional bomber. All of the carrier aircraft cases evaluated were conceptual; no specific airframe models or manufacturers are identified. The principles and technology presented are not limited to missile bays; they are applicable to general cavities having free-stream flow velocities above Mach 0. 4. It is observed that above Mach 0.4 the pressure fluctuations in an oscillating cavity may arise from: (a) sustained periodic pressure fluctuations in the aperture shear layer that radiate noise into the cavity; and (b) sustained periodic pressure fluctuations in the aperture shear layer that couple with the cavity volume acoustic modes (this generally produces by far the most intense cavity oscillation). Theoretical/empirical techniques are presented for predicting oscillatory frequency, pressure level, pressure spatial distribution in the cavity, and the degree of alleviation achievable with suppressors. The information is based on extensive experimentation with subscale models having apertures of 2 to 6 in. in a cold air wall-jet flow facility. A bibliography is included containing 145 listings.