Active control of the leakage flow by air injection into the rotational shroud or the fixed carter of an axial fan composed of hollow blades

Tarik Azzam (1, 2) , Richard Paridaens (2) , Florent Ravelet (2) , Mahmoud Mekadem (1) , Sofiane Khelladi (2) , Hamid Oualli (1) , Farid Bakir (2)

1 EMP - École Militaire Polytechnique [Alger]
2 DynFluid - Laboratoire de Dynamique des Fluides

This paper focuses on the injection used to reduce the phenomenon of leakage flow oc- curring at the blade tip. This flow driven by the pressure difference between the pressure side and suction side is responsible for important energy dissipations. In this study, active control by air injection in the tip clearance gap of an axial fan is experimentally investigated. A new methodology was developed to build hollow fan in which an internal flow could occur. The internal flow, generated by the compressed air system of the laboratory, exited the fan at the tip clearance in purpose to reduce the leakage flow. The results of this control by air injection are presented in this paper.

Domaines: Dynamique des Fluides [physics.flu-dyn]

Tarik Azzam, Richard Paridaens, Florent Ravelet, Mahmoud Mekadem, Sofiane Khelladi, et al.. Active control of the leakage flow by air injection into the rotational shroud or the fixed carter of an axial fan composed of hollow blades. 22è Congrès Français de Mécanique, Aug 2015, Lyon, France. ⟨hal-01189441⟩