Matches in SemOpenAlex for { <https://semopenalex.org/work/W2023854771> ?p ?o ?g. }
Showing items 1 to 84 of
84
with 100 items per page.
- W2023854771 endingPage "234" @default.
- W2023854771 startingPage "205" @default.
- W2023854771 abstract "Results obtained for noise produced by two obstructions—one circular (1 inch diameter x 2·84 inch long) and another rectangular (0·4 inch thick x 1 inch wide x 2·84 inch long) in shape—immersed in both “clean” and turbulent flows 4·8 inches upstream of the nozzle exit are described. Variations of overall sound pressure levels (OASPL's) and power Watt levels (PWL's) with jet exit velocity (Vj) and the directivities of OASPL's are considered in detail. Considerable care was taken to ensure that any comparison of the obstruction generated noise with the “clean” jet noise is for the same mean jet exit velocity and thrust. The mean jet exit velocity was derived from the measured velocity profile at the nozzle exit in each case. For the same mean exit velocity and nozzle diameter, the noise levels with the circular obstruction were measured to be as much as 40 dB higher than the “clean” jet noise. The rectangular obstruction increased the noise by up to 10 dB. Flow over these obstructions generated discrete tones as well. The velocity index for the obstruction generated noise were between 8 and 9 between Vj=350 ft/s and 1000 ft/s. This contradicts the traditional V6 law. The main reason for the discrepancy has been attributed to the variation of the coefficient of fluctuating lift, C L 2 ¯ , with Reynolds number. The angle of peak overall sound pressure levels (OASPL's) was between 45° and 60°, as compared to between 0° and 20° for the clean jet noise. When the obstructions were immersed in turbulent flows most of the discrete tones which were obtained from the obstructions in smooth flows disappeared. The high frequency noise levels, however, increased by as much as 20 dB." @default.
- W2023854771 created "2016-06-24" @default.
- W2023854771 creator A5053076232 @default.
- W2023854771 date "1974-11-01" @default.
- W2023854771 modified "2023-10-16" @default.
- W2023854771 title "An experimental study of the effects of upstream obstructions upon subsonic jet noise" @default.
- W2023854771 cites W1582846548 @default.
- W2023854771 cites W1807481884 @default.
- W2023854771 cites W1973651212 @default.
- W2023854771 cites W1978706453 @default.
- W2023854771 cites W1986627327 @default.
- W2023854771 cites W1997554557 @default.
- W2023854771 cites W2016514299 @default.
- W2023854771 cites W2017488472 @default.
- W2023854771 cites W2034801199 @default.
- W2023854771 cites W2038048614 @default.
- W2023854771 cites W2076323684 @default.
- W2023854771 cites W2079301181 @default.
- W2023854771 cites W2079444525 @default.
- W2023854771 cites W2087157847 @default.
- W2023854771 cites W2107362277 @default.
- W2023854771 cites W2111597484 @default.
- W2023854771 cites W2169565444 @default.
- W2023854771 cites W2160306336 @default.
- W2023854771 doi "https://doi.org/10.1016/s0022-460x(74)80329-9" @default.
- W2023854771 hasPublicationYear "1974" @default.
- W2023854771 type Work @default.
- W2023854771 sameAs 2023854771 @default.
- W2023854771 citedByCount "4" @default.
- W2023854771 countsByYear W20238547712013 @default.
- W2023854771 countsByYear W20238547712017 @default.
- W2023854771 crossrefType "journal-article" @default.
- W2023854771 hasAuthorship W2023854771A5053076232 @default.
- W2023854771 hasConcept C115961682 @default.
- W2023854771 hasConcept C119947313 @default.
- W2023854771 hasConcept C120763676 @default.
- W2023854771 hasConcept C121332964 @default.
- W2023854771 hasConcept C127413603 @default.
- W2023854771 hasConcept C146978453 @default.
- W2023854771 hasConcept C154945302 @default.
- W2023854771 hasConcept C191172861 @default.
- W2023854771 hasConcept C24890656 @default.
- W2023854771 hasConcept C2778940620 @default.
- W2023854771 hasConcept C41008148 @default.
- W2023854771 hasConcept C57879066 @default.
- W2023854771 hasConcept C68115822 @default.
- W2023854771 hasConcept C76155785 @default.
- W2023854771 hasConcept C99498987 @default.
- W2023854771 hasConceptScore W2023854771C115961682 @default.
- W2023854771 hasConceptScore W2023854771C119947313 @default.
- W2023854771 hasConceptScore W2023854771C120763676 @default.
- W2023854771 hasConceptScore W2023854771C121332964 @default.
- W2023854771 hasConceptScore W2023854771C127413603 @default.
- W2023854771 hasConceptScore W2023854771C146978453 @default.
- W2023854771 hasConceptScore W2023854771C154945302 @default.
- W2023854771 hasConceptScore W2023854771C191172861 @default.
- W2023854771 hasConceptScore W2023854771C24890656 @default.
- W2023854771 hasConceptScore W2023854771C2778940620 @default.
- W2023854771 hasConceptScore W2023854771C41008148 @default.
- W2023854771 hasConceptScore W2023854771C57879066 @default.
- W2023854771 hasConceptScore W2023854771C68115822 @default.
- W2023854771 hasConceptScore W2023854771C76155785 @default.
- W2023854771 hasConceptScore W2023854771C99498987 @default.
- W2023854771 hasIssue "2" @default.
- W2023854771 hasLocation W20238547711 @default.
- W2023854771 hasOpenAccess W2023854771 @default.
- W2023854771 hasPrimaryLocation W20238547711 @default.
- W2023854771 hasRelatedWork W1993365278 @default.
- W2023854771 hasRelatedWork W2017131349 @default.
- W2023854771 hasRelatedWork W2029333781 @default.
- W2023854771 hasRelatedWork W2069504108 @default.
- W2023854771 hasRelatedWork W2088034590 @default.
- W2023854771 hasRelatedWork W2314343930 @default.
- W2023854771 hasRelatedWork W2322325556 @default.
- W2023854771 hasRelatedWork W2330725366 @default.
- W2023854771 hasRelatedWork W2368068012 @default.
- W2023854771 hasRelatedWork W2468626310 @default.
- W2023854771 hasVolume "37" @default.
- W2023854771 isParatext "false" @default.
- W2023854771 isRetracted "false" @default.
- W2023854771 magId "2023854771" @default.
- W2023854771 workType "article" @default.