U. De-même and . Changement, de fréquence de l'onde d'excitation ne modifie pas le spectre des valeurs propres de la P.O.D d'un jet annulaire soumisàsoumisà un forçage acoustique

L. '´-etude-par and P. O. , du forçage acoustique d'un jet annulaire permet de confirmer les suppositions déduites des mesures P.I.V. et de souligner l'importance de la phase de l'onde acoustique dans cetté etude. En effet, les mesures dépendentdépendentà la fois de l'´ ecoulement, de l'onde acoustique maiségalementmaiségalement des mesures réalisées par P.I.V. Cette technique de mesure n'est pas résolue temporellement. Pour réduire leprobì eme de phase de cetté etude

P. O. Cetté-etude-préalable-permet-de-comparer-l-'analyse, des champs de vitesse du jet annulaire basique et celle des champs de vitesse des jets annulaires conique et sphéro¨sphéro¨?dal, sous quelques réserves. Les premiers modes propres peuventêtrepeuventêtre comparés, jusqu'au mode 3. Les modes plusélevésplusélevés, correspondantàcorrespondantà desénergiesdesénergies plus faibles attachéesattachéesà des structures tourbillonnaires de plus petiteséchellespetiteséchelles ne peuvent pasêtrepasêtre comparés puisqu'il appara??tappara??t des différences notables, difficilement soumisesàsoumisesà interprétation

B. Annexe, Validité d'une analyse P.O.D. de demi-champs de vitesse

. L. De-vitesse, interprétation desécartsdesécarts types des coefficients de reconstruction doit tout de mêmemêmê etre considérée avec précaution puisque desécartsdesécarts notables ontétéontété observés dans ce cas. En revanche, la répartitionrépartitionénergétique des différents modes ne varie pas lorsque l'analyse P

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