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Circular cylinder drag reduction by three-electrode plasma actuators

2009; IOP Publishing; Volume: 166; Linguagem: Inglês

10.1088/1742-6596/166/1/012015

1742-6596

Roberto Sosa, Juan D’Adamo, Guillermo Artana,

Aerodynamics and Fluid Dynamics Research

The drag reduction in a circular cylinder was explored by means of a novel three electrode plasma actuator (DBDE). The DBDE actuator can reduce the drag coefficient up to a ~25% respect to the base flow drag coefficient. It has been demonstrated that, within the present experimental conditions, the DBDE actuator, for a fixed value of the power coefficient, adds a higher momentum to the flow and, consequently, produces a higher drag reduction than the DBD actuator with the same power coefficient. The actuator efficiency was analysed in terms of the momentum added to the flow revealing similar behaviour for both kind of actuators. However to produce similar levels of actuation both kind of actuators require different values of VAC voltages that resulted always lower for D BDE. The reduction in this high voltage value is highly beneficial as is directly related to: a lower HV AC source power requirement, a reduction in the dielectric breakdown probability of the device and a reduction in leakage currents.