UNSPECIFIED (1995) THE EFFECT OF SOLID-SURFACES ON TURBULENT JET NOISE. JOURNAL OF SOUND AND VIBRATION, 185 (3). pp. 397-413. ISSN 0022-460X

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Abstract

Lighthill's acoustic analogy is applied to the problem of calculating the sound radiated by unit volume of jet-type shear-layer turbulence near a solid surface. The ensemble-averaged basic directivity patterns of the sound generated by randomly orientated longitudinal and lateral quadrupoles near a rigid plane are calculated, and are found to be very different for the two types of quadrupole. A method of modelling the acoustic sources, due to Ribner, is extended to the present case, enabling the basic directivity pattern to be calculated. The effect of the solid surface is found to depend strongly on the source frequency, and a method for estimating the source frequency in an actual turbulent shear flow is developed. The theory is applied to a plane two-dimensional wall jet, and predictions of some basic aero-acoustic characteristics are obtained. (C) 1995 Academic Press Limited

Item Type:	Journal Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TJ Mechanical engineering and machinery
Journal or Publication Title:	JOURNAL OF SOUND AND VIBRATION
Publisher:	ACADEMIC PRESS (LONDON) LTD
ISSN:	0022-460X
Date:	24 August 1995
Volume:	185
Number:	3
Number of Pages:	17
Page Range:	pp. 397-413
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/19514

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