Effect of perforated tabs on the noise field of an axisymmetric jet

Hussain, GF and Nasser, AS and Nawaz, MM and Mondal, BK and Karthikeyan, N (2013) Effect of perforated tabs on the noise field of an axisymmetric jet. Applied Mechanics and Materials, 307 . pp. 250-256. ISSN ISSN: 1662-7482

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Abstract

Effect of triangular tabs with circular perforations on the acoustic far-field of an axisymmetric jet issued from a convergent nozzle of exit diameter of 30.16 mm was studied for both subsonic and sonic underexpanded cases. It was found that the noise in the low frequency range (Strouhal number < 0.29) reduced in both subsonic and supersonic jet mach numbers with a penalty in high frequency noise. OASPL plots showed that overall noise levels in subsonic jets increased due to the introduction of tabs except for far downstream angles where the noise levels reduced by 2 dB. Overall noise levels in underexpanded jets decreased in all directions and at all jet mach numbers without the penalty of high frequency noise. Comparison between tabs without perforation and perforated tabs showed that both the tabs were equally effective.

Item Type: Journal Article
Uncontrolled Keywords: Aeroacoustics;Jet noise;Tabs
Subjects: AERONAUTICS > Aeronautics (General)
AERONAUTICS > Aerodynamics
Division/Department: Other, Other, Other, Other, Experimental Aerodynamics Division
Depositing User: Ms. Alphones Mary
Date Deposited: 24 Mar 2014 10:08
Last Modified: 24 Mar 2014 10:08
URI: http://nal-ir.nal.res.in/id/eprint/11938

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