ESDU 87011:2010

$22.75

Prediction of Single-Stream Jet Noise in Flight from Static Circular-Nozzle Data

Published By	Publication Date	Number of Pages
ESDU	2010-06	NA

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INTRODUCTION

This Item provides a computerized method for predicting pure jet
flyover noise spectra from noise spectra measured from, or
predicted for, a stationary jet. The changes in noise levels from
static to flight conditions are often referred to as
static-to-flight effects. The computational procedure is almost
identical to the method described in Derivation 1 and is applicable
to single-stream jets with circular nozzles.

There are three basic changes in noise spectra when going from
static conditions to flight conditions. The first is the spectral
shape change which arises from changes in jet refraction due to
flight. The second and third changes are the shifts in amplitude
and frequency arising from the effects of motion on the source. The
approach used in this Item considers the change in jet refraction
by an angle transposition and uses empirical correlations of
experimental data to predict amplitude and frequency changes.


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Published Code	ESDU
Published By	ESDU
Publication Date	2010-06
Pages Count	NA
Language	English
File Size	409.6 KB
ISBN	9780856796043

ESDU 87011:2010

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