Two-dimensional modifications

Firstly suggestions are presented that can be applied to two-dimensional Gurney-flap configurations and will therefore be investigated by two-dimensional simulations. All developments are based on a Gurney-flap with $h/c=1\%$. An overview of the geometries is given in table .

Results of all configurations and their effect on the mean aerodynamic quantities are summarized in table . The ratio $\frac{\Delta c_d}{\Delta c_{d,Gurney}}$ quantifies how much of the Gurney-flap induced drag can be compensated for by the introduction of each particular modification. Snapshots of the flow field are plotted in fig. .

Table: Investigated two-dimensional Gurney-flap modification

a)				HQ17
b)				Gurney-flap ($1\%$)
c)				splitter-plate
d)				twin bars
e)				triple bars
f)				wake body I
g)				wake body II