Aérodynamique et contrôle de l'écoulement de jeu dans un ventilateur axial obtenu par rotomoulage.

Abstract : Nowadays, the manufacture of turbomachinery is conditioned by more and more restrictive rules. The industrial challenge for researchers has to consider optimal solutions to reduce sources of energy loss, instability and noise, particularly the tip clearance flow (leakage flow rate). Preliminary actions have been developed at Arts & ParisTech on rotational molding process used for the automobile cooling axial fan. The idea of this work is to use the hollow shape induced by rotational molding process in order to exploit it in the control of tip clearance flow through rotary steady air injection. For this, the shroud ring is composed of injection holes oriented in such away to reduce both of leakage flow rate and the torque. In this work, the thesis focuses on three parts. The first concerns the build of the fan by rotational molding process. The second concerns the experimental study carried out in the ISO 5801 test bench. This study involves the realization of drive system dedicated to rotary steady air injection, metrology for performance determination and the characterization of the near wake axial velocity. The third part deals with the numerical modeling of efficient experimental conditions, then the extrapolation of work towards high injection rates. For this latter, it is possible to cancel leakage flow rate with a considerable gain of the torque thus putting the fan in autorotation.
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Tarik Azzam. Aérodynamique et contrôle de l'écoulement de jeu dans un ventilateur axial obtenu par rotomoulage.. Mécanique des fluides [physics.class-ph]. Ecole nationale supérieure d'arts et métiers - ENSAM; École Militaire Polytechnique (Alger), 2018. Français. ⟨NNT : 2018ENAM0080⟩. ⟨tel-02048594⟩

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