Annular jet aerodynamic and passive control study by Proper Orthogonal Decomposition

Abstract eng:
The annular jet is an example of complex shear flow situations. Two axisymmetric shear layers, originating at the jet exit, one at the nozzle lip and the other at the centre body, eventually meet downstream or interact with each other. The main aim of this study is to observe and analyze the effects of passive control on an annular jet with a great diameter ratio (r= 0.91), in order to find a new way to reduce jet instabilities. This contribution discusses the application of Proper Orthogonal Decomposition to the Particle Images Velocimetry (PIV) velocity fields of the initial zone of an armular jet. Passive control has already been used with round jets and has given promising results. This work will permit us essentially to have a better knowledge of armular jets and used the potential of Proper Orthogonal Decomposition for aerodynamic study. Key—Words: — Annular jet, Particle Image Velocimetry, Proper Orthogonal Decomposition, Passive Control

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