Author/Authors :
Tounsi، Nabil نويسنده Laboratoire dAutomatique, de Mécanique et dInformatique industrielles et Humaines (LAMIH), unités mixtes de recherche (UMR),Centre national de la recherche scientifique (CNRS),Valenciennes,France , , MESTIRI، Rafika نويسنده Laboratory of Fluid Mechanics,École militaire polytechnique (EMP),Bordj El Bahri,Algeria , , Keirsbulck، Laurent نويسنده Laboratoire dEtude des Systemes Thermiques et Energetiques,École nationale dingénieurs de Monastir (ENIM),Monastir,Tunisie , , Oualli، Hamid نويسنده Laboratory of Fluid Mechanics,École militaire polytechnique (EMP),Bordj El Bahri,Algeria , , Hanchi، Samir نويسنده Laboratory of Fluid Mechanics,École militaire polytechnique (EMP),Bordj El Bahri,Algeria , , Aloui، Fethi نويسنده Laboratoire dAutomatique, de Mécanique et dInformatique industrielles et Humaines (LAMIH), unités mixtes de recherche (UMR),Centre national de la recherche scientifique (CNRS),Valenciennes,France ,
Abstract :
Active flow control is experimentally investigated on a car-type bluff body. The actuation is based
on a synthetic jet actuator placed at the top of the Ahmed body rear window. In the present paper, a
synthetic jet characterization is presented, the frequencies and the optimal amplitudes with regard to
the spatial evolution are analyzed. All the measurements are carried out in a wind tunnel at Reynolds numbers based on the body length between 10^6 and 3×10^6. The bluff body shows a maximum drag reduction of 10% when optimal control is applied. Independent effect of the reduced frequency
and the momentum coefficient actuation parameters on the drag reduction are also detailed in the
present paper. This reduction induces changes in the flow field due to the piezoelectric actuation.
The flow topology modification is investigated via particle image velocimetry measurements in order
to estimate the flow response to a local excitation and to understand the mechanism involved in the
aerodynamic drag control.
Keywords :
Drag Reduction , Flow Control , Piezoelectric actuator. , bluff body , synthetic jet
