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NASA-TM-X-3292

Measurements of farfield sound generation from a flow-excited cavity

contributor authorNASA - National Aeronautics and Space Administration (NASA)
date accessioned2017-09-04T16:53:09Z
date available2017-09-04T16:53:09Z
date copyright01/01/1975
date issued1975
identifier otherWUTKAEAAAAAAAAAA.pdf
identifier urihttps://yse.yabesh.ir/std/handle/yse/116549
description abstractResults of 1/3-octave-band spectral measurements of internal pressures and the external acoustic field of a tangentially blown rectangular cavity are compared. Proposed mechanisms for sound generation are reviewed, and spectra and directivity plots of cavity noise are presented. Directivity plots show a slightly modified monopole pattern. Frequencies of cavity response are calculated using existing predictions and are compared with those obtained experimentally. The effect of modifying the upstream boundary layer on the noise was investigated, and its effectiveness was found to be a function of cavity geometry and flow velocity.
languageEnglish
titleNASA-TM-X-3292num
titleMeasurements of farfield sound generation from a flow-excited cavityen
typestandard
page48
statusActive
treeNASA - National Aeronautics and Space Administration (NASA):;1975
contenttypefulltext
subject keywordsAERODYNAMIC
subject keywordsBACKGROUND
subject keywordsCAVITIES
subject keywordsDATA
subject keywordsFAR
subject keywordsFIELDS
subject keywordsFLOW
subject keywordsGENERATORS
subject keywordsINTERNAL
subject keywordsNOISE
subject keywordsPRESSURE
subject keywordsSOUND
subject keywordsSPECTRA
subject keywordsTABLES
subject keywordsVELOCITY


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