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Acoustic characteristics of chamfered Hartmann whistles

Acoustic characteristics of chamfered Hartmann whistles
Acoustic characteristics of chamfered Hartmann whistles
Experimental studies are conducted to investigate the effect of internal chamfer at the mouth of Hartmann resonators. Studies involve a range of nozzle pressure ratios from 4 to 6, and chamfer angles 15°, 30°, and 45°. Further, the effects of cavity length and stand-off distance are also considered. The spectra, directivity, and acoustic power characteristics are studied in detail. Detailed numerical simulations are carried out to capture the flow oscillations inside as well as at the outside of the mouth of the chamfered cavities. Computations show flow diversion in chamfered cavities and explain the shift in the directivity observed experimentally. The fundamental frequency of cavities with 15° and 30° chamfers is observed to be higher than that of regular cavities. Resonance is intensified by the presence of chamfer resulting in higher overall sound pressure levels of chamfered whistles. Thus, chamfered Hartmann whistles are found to emit more than twice the acoustic power of a regular cylindrical whistle. The tonal quality of sound is analyzed using a new metric termed as “resonance index”
0022-460X
2470-2496
Narayanan, S.
496a8ad5-626a-442f-b61a-cd2ab3f7731e
Srinivasan, K.
e97abff3-2c9b-423e-bcb7-3bde3508101d
Sundararajan, T.
9487d2ce-b852-4b8b-b5ce-b921e12ae640
Ramamurthi, K.
ee212c76-2deb-421f-9625-801705bfaafe
Narayanan, S.
496a8ad5-626a-442f-b61a-cd2ab3f7731e
Srinivasan, K.
e97abff3-2c9b-423e-bcb7-3bde3508101d
Sundararajan, T.
9487d2ce-b852-4b8b-b5ce-b921e12ae640
Ramamurthi, K.
ee212c76-2deb-421f-9625-801705bfaafe

Narayanan, S., Srinivasan, K., Sundararajan, T. and Ramamurthi, K. (2011) Acoustic characteristics of chamfered Hartmann whistles. Journal of Sound and Vibration, 330 (11), 2470-2496. (doi:10.1016/j.jsv.2010.12.003).

Record type: Article

Abstract

Experimental studies are conducted to investigate the effect of internal chamfer at the mouth of Hartmann resonators. Studies involve a range of nozzle pressure ratios from 4 to 6, and chamfer angles 15°, 30°, and 45°. Further, the effects of cavity length and stand-off distance are also considered. The spectra, directivity, and acoustic power characteristics are studied in detail. Detailed numerical simulations are carried out to capture the flow oscillations inside as well as at the outside of the mouth of the chamfered cavities. Computations show flow diversion in chamfered cavities and explain the shift in the directivity observed experimentally. The fundamental frequency of cavities with 15° and 30° chamfers is observed to be higher than that of regular cavities. Resonance is intensified by the presence of chamfer resulting in higher overall sound pressure levels of chamfered whistles. Thus, chamfered Hartmann whistles are found to emit more than twice the acoustic power of a regular cylindrical whistle. The tonal quality of sound is analyzed using a new metric termed as “resonance index”

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More information

Published date: 23 May 2011
Organisations: Inst. Sound & Vibration Research

Identifiers

Local EPrints ID: 353734
URI: http://eprints.soton.ac.uk/id/eprint/353734
ISSN: 0022-460X
PURE UUID: bd7d6657-018c-4fba-9b5c-44ee218016e4

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Date deposited: 20 Jun 2013 09:16
Last modified: 16 Jul 2019 21:30

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Contributors

Author: S. Narayanan
Author: K. Srinivasan
Author: T. Sundararajan
Author: K. Ramamurthi

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