Effect of lip thickness on the aero-acoustic features of Hartmann whistle

The primary objective of this work is to investigate lip-thickness effect on the various acoustic emission characteristics of Hartmann whistle. Nozzle-to-cavity distance (stand-off distance), cavity length, nozzle pressure ratio and lip thickness form the pertinent parameters of the present study. T...

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Published in:Proceedings of the Institution of Mechanical Engineers. Part G, Journal of aerospace engineering Journal of aerospace engineering, 2014-06, Vol.228 (8), p.1302-1313
Main Authors: Narayanan, S, Srinivasan, K, Sundararajan, T
Format: Article
Language:English
Subjects:
Acoustic emission
Aerospace engineering
Aircraft components
Emittance
Holes
Mechanical engineers
Nozzles
Pressure
Pressure ratio
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description The primary objective of this work is to investigate lip-thickness effect on the various acoustic emission characteristics of Hartmann whistle. Nozzle-to-cavity distance (stand-off distance), cavity length, nozzle pressure ratio and lip thickness form the pertinent parameters of the present study. Two lip thicknesses considered in the present study are a thick-lipped cavity (5 mm) and a thin-lipped cavity (1 mm). Although lip thickness has negligible effect on the resonance frequency, it has significant influence over the sound pressure levels generated. The results showed that thin-lipped-Hartmann whistles could emit up to 2.4 times the acoustic power as compared with thick-lipped whistles.
doi_str_mv 10.1177/0954410013490095
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subjects Acoustic emission
Aerospace engineering
Aircraft components
Emittance
Holes
Mechanical engineers
Nozzles
Pressure
Pressure ratio
title Effect of lip thickness on the aero-acoustic features of Hartmann whistle
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