Abstract
This work presents an experimental investigation about the effects of triangular tips on the active electrodes of plasma actuators. The tests are performed on two sets of actuators, corona and DBD, parameterized by means of the tip sharpness and the tips number per unit length. A total number of 30 actuators is considered. The devices are evaluated on the basis of the far field ionic wind velocity, that has been chosen as a representative test common to both kinds of actuator. The dataset includes velocity profiles and maps, that can be integrated to give mass ows and electromechanical effciencies. Some results are also presented in the parameter space defined by tip sharpness and tips number per unit length: this gives the chance of defining optimal electrode shapes within each set. In general, the longitudinal velocity of the gas increases downstream of the tips in all the actuators tested, but the velocity field is modified to different extents in the two kinds of actuators, and is more complicated for the DBDs than for the coronas. The tips also increase the effciency of all the actuators, particularly for the corona set, where even the stability is remarkably improved.
Highlights
The present work deals with some properties of the plasma actuators, widely studied because of their capacity to produce a ionic wind
Some results are presented in the parameter space defined by tip sharpness and tips number per unit length: this gives the chance of defining optimal electrode shapes within each set
This work describes an experiment about plasma actuators, both corona and DBD types, in order to characterize the flow field induced by a multi-tip geometry of the upstream electrodes
Summary
The present work deals with some properties of the plasma actuators, widely studied because of their capacity to produce a ionic wind. The corona actuators under study are represented in figure 1 and listed by their geometrical parameters in table 1: the set includes a wire-to-plate actuator C1 (figure 1a) as a reference, several actuators with serrated anodes C2...C12 (figure 1b) and an actuator with isolated tips C13 (figure 1c). The accuracy of the electrical measurements, reported for the power consumption of the devices, is in the order of 0.4 W (or 1 W/m) for the coronas and 1.2 W (or 3 W/m) for the DBDs. Sizes and operating conditions for the two sets have been selected after preliminary tests in order to give ionic wind velocities in the same order of magnitude, comparisons within each set are possible as well as comparisons between actuators in different. 40 25 100 100 100 50 the probe: for angular differences between the velocity vector and the probe axis up to ±40◦, the uncertainty for the longitudinal velocity component cannot exceed values of 0. 2m/s
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