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• W2772101823 abstract "Abstract In this work, jet noise reduction using a swirling flow surrounding a circular free jet has been demonstrated. The passive control scheme induces swirl from six flat vanes fixed in an annular passage with vane angles from 0 to 50°, with the corresponding swirl numbers ranging from 0 to 0.91. Noise measurements in terms of overall sound pressure levels, directivity patterns, acoustic spectra; and flow measurements in terms of centerline pitot survey and flow visualization have been carried out to evaluate the efficacy of the passive control scheme. The co-axial swirl jets always reduce the low frequency noise, irrespective of the nozzle pressure ratio. The screech tone is entirely eliminated and broadband shock associated noise mitigated by the co-axial swirl jets. The results of highly under expanded supersonic cases, show that, the weak swirl generates higher noise and high swirl generates lower noise for the same nozzle pressure ratio. The centerline pitot pressure measurements reveal that the co-axial swirl jets decrease the core lengths and the number of shock cells compared to the free jet. The flow visualization study shows that Mach disks are generated at lower pressure ratios for the co-axial swirl jets compared to free jet. The present work proposes swirl as an excellent passive tool for jet noise suppression." @default.
• W2772101823 created "2017-12-22" @default.
• W2772101823 creator A5062356901 @default.
• W2772101823 creator A5084543644 @default.
• W2772101823 date "2018-02-01" @default.
• W2772101823 modified "2023-09-25" @default.
• W2772101823 title "Influence of swirl number on jet noise reduction using flat vane swirlers" @default.
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• W2772101823 doi "https://doi.org/10.1016/j.ast.2017.11.039" @default.
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