Contribution à l'étude aéroacoustique des écoulements de jeu

Abstract : For fans with a rotor confined by a casing, such as encountered in turbomachinery, the spacing between the blade tips and the casing wall is referred to as gap or tip clearance. Complex flows take place in this region that contributes to the overall sound generation of the fan. The objective of the present study is on one hand to improve the understanding of tip leakage flow and its associated broadband noise. On the other hand, efforts are put towards tip leakage broadband noise prediction. The literature review reveals the influence of the gap size onto the flow is highlighted. A experiment carried out on a simplified configuration, which consists of a single non rotating blade with tunable incidence and gap, is presented. A parametric study was conducted in order to determine the influence of the flow velocity, the angle of attack and the gap. Its main results as well as evolution laws are reported and discussed.
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Engineering Sciences. Ecole Centrale de Lyon, 2009. French. <NNT : 2009ECDL0034>


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Julien Grilliat. Contribution à l'étude aéroacoustique des écoulements de jeu. Engineering Sciences. Ecole Centrale de Lyon, 2009. French. <NNT : 2009ECDL0034>. <tel-00564497>

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