Semi-empirical methods for coaxial jet noise prediction

Abstract

This work is describes and compare the implementation and exploitation of the
most common semi-empirical methods for dual-stream (coaxial) jet noise prediction.
Six different methods available in the literature were numerically implemented and
validated against experimental results. In addition, a detailed discussion is presented in
order to show the advantages and disadvantages of each empirical model employed, as
well as its limitations.
Special attention is given to the so-called Four-Source model, developed in the
Institute of Sound and Vibration (ISVR). This method was carefully examined since it
relies on physical assumptions to describe the noise sources inside the coaxial jet flow.
Although, it is still an empirical method, its results are found to be more consistent and
reliable than the others methods considered.

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