, Des mesures ontétéontété réalisées en plaçant un diaphragme dans ce tronçon. Les résultats ont permis d'´ etudier l'influence de certains paramètres, tels la présence d'unécoulementunécoulement, la vitesse de l'´ ecoulement et la présence ou non d'un chanfrein . Les mesures ont montré que le diaphragme seul présente des propriétés passives symétriques (Figure 6.6 et Figure 6.7) La présence de l'´ ecoulement modifie ces résultats (Figure 6.8 et Figure 6.9), ce qui s'explique par la convection des ondes acoustiques par l'´ ecoulement, Ce chapitre a présenté le banc de mesure développé au sein du laboratoire permettant de déterminer les propriétés acoustiques dites passives Lorsque la vitesse d'´ ecoulement augmente, les niveaux de pressions rayonnés en aval augmentent (Figure 6.13), ce qui est en accord avec les résultats de Nelson [49] qui montrent que la pression propagée pour le mode plan est proportionnellèproportionnellè a U 4
, optique de réduire les nuisances acoustiques, les mesures ont montré qu'ií etait préférable de chanfreiner le diaphragme, la puissance rayonnéé etant alors légérement plus faible. Des calculs ontétéontété réalisés pour deux configurations de mesures (diaphragme avec et sans chanfrein, en utilisant la méthode de calcul développée au chapitre 4
, Ceci est en partie dû au fait que les résultats sont très oscillants, les calculs du champs source n'´ etant réalisé qu'une seule fois. Une voie d'amélioration serait de réaliser plusieurs calculs du champ source CFD pour les moyenner et lisser les résultats finaux. Unedeuxì eme voie d'amélioration serait de réaliser un calcul tridimensionnel complet, qui pourrait permettre d'obtenir des résultats sensiblements plus précis
, Néanmoins, en pratique le champ source est obtenu par un calcul CFD incompressible Dans le cas d'unécoulement unécoulement en conduite, le calcul du terme dipolairè a partir de la pression pariétale incompressible aboutitàaboutità desécartsdesécarts notables des niveaux de pression. Durant ce travail de thèse, une méthode innovante a ´ eté développée visantàvisantà réunir les avantages de chaque méthode
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