A Theoretical and Experimental Investigation of the Acoustic Response of Cavities in an Aerodynamic Flow PDF Download
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Author: H. E. Plumblee
Publisher:
ISBN:
Category : Sound
Languages : en
Pages : 166
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Book Description
Author: H. E. Plumblee
Publisher:
ISBN:
Category : Sound
Languages : en
Pages : 166
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 432
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Author: Song Fu
Publisher: Springer Nature
ISBN: 9819739985
Category :
Languages : en
Pages : 1975
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 44
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Book Description
Author: James Scheiman
Publisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 40
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Book Description
Author: Donald A. Buell
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 84
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Author:
Publisher:
ISBN:
Category : Astronautics
Languages : en
Pages : 628
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Author: Leonard L. Shaw
Publisher:
ISBN:
Category : Oscillations
Languages : en
Pages : 68
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Book Description
A flight test program was performed to gain further insight into the phenomenon of flow-induced cavity pressure oscillations and to evaluate the effectiveness of suppression concepts in eliminating or reducing the pressure oscillations. The cavities tested were rectangular with approximate dimensions of 17 inches long, 8.5 inches deep, and 8.75 inches wide and were instrumented with microphones, static pressure ports, and a thermocouple. The flight speeds ranged from Mach number 0.6 to 1.3 at pressure altitudes of 3,000, 20,000, and 30,000 feet. The suppression devices included leading edge spoilers and deflectors and trailing edge ramps and deflectors. Several combinations of these were tested. The results indicate that the flow-induced pressure oscillations in a cavity of the dimensions tested and for the speed range tested can be significantly reduced with leading edge spoilers in conjunction with a trailing edge ramp. Reductions as large as 30 dB were achieved for the predominant model frequency for a one-third octave band. Other combinations of the suppression devices afforded some reduction, but the spoiler ramp combination proved most effective. (Author).
Author: R. C. Bauer
Publisher:
ISBN:
Category : Aeroacoustics
Languages : en
Pages : 90
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Book Description
A mathematical model was assembled from fundamental fluid dynamic relations and turbulent single-stream mixing zone relations to predict spectra, i.e., the frequency and amplitude, of unsteady pressures acting in a rectangular cavity exposed to an external flow parallel to the cavity opening. Characteristics of the approaching boundary layer are expected as inputs, thereby allowing computation of spectra for cases of mass-injection upstream of the cavity. The equations were compiled as a code (CAP) that can be run in less than 15 sec on a personal computer. Maximum dynamic loads acting on the contents of the cavity can be estimated, in addition to the primary frequencies of oscillation.
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 748
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