  Numerical simulations of plasma flow induced by dielectric barrier discharge
plasma actuators (DBD-PA) are conducted with two different body-force models:
Suzen-Huang (S-H) model and drift-diffusion (D-D) model. The induced flow
generated in quiescent air over a flat plate in continuous actuation and the
PA-based flow control effect with burst actuation in separated flow over
NACA0015 is studied. In the comparative study, the body-force field and the
induced velocity field are firstly investigated in the quiescent field to see
the spatial difference and the temporal difference in a single discharge cycle.
The D-D body force is computed with flush-mounted and bulge configuration of
the exposed electrode, which is operated at the peak-to-peak AC voltage of 7kV
and 10kV. The D-D models generate momentarily higher body force in the
positive-going phase of the AC power, but activate a smaller flow region than
the S-H model with Dc = 0.0117, which is given by the experiment beforehand at
7kV. The local induced velocity of the D-D bulge case at 7kV measured in the
downstream flow has the best agreement with the experimental result. The
maximum wall-parallel induced velocity in the S-H case with Dc = 0.0117 is
consistent with that in the experiment, however, the local induced velocity is
relatively high with different flow structures. In the post-stall flow over the
airfoil at the angle of attack of 12 degrees and Reynolds number of 63000, the
D-D bulge model at 7kV has approximately the same effect of leading-edge
suction enhancement and reattachment promotion as the S-H model with Dc = 0.16,
which was previously proved to be sufficiently high to achieve the control
performance.
