The Self-Noise From Ordered Structures in a Low Mach Number Jet

[+] Author and Article Information
R. R. Mankbadi

Cairo University, Cairo, Egypt

J. Appl. Mech 57(1), 241-246 (Mar 01, 1990) (6 pages) doi:10.1115/1.2888310 History: Received April 05, 1988; Revised January 06, 1989; Online March 31, 2008


This article is concerned with examining the self-noise produced by instability waves in a round jet. The self-noise is defined here as the noise attributed to the nonlinear sources in Lighthill’s stress tensor. The calculated self-noise is found to be proportional to the fourth order of the velocity amplitude saturation. The self-interaction of the instability waves results in a “super-directivity.” The dependency of the sound intensity on the Strauhal number and on the Mach number is in accordance with observations.

Copyright © 1990 by The American Society of Mechanical Engineers
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