This Drag Reduction System rear wing model was created using NX2512 to explore the different concepts of Aerodynamic lift/downforce, drag and wing efficiency ratios. It has an actuator modelled in with a moving mechanism to switch the wing between a low downforce/high top speed position and a high downforce/cornering speed position.
The open wing had an average downforce of 630N with a drag force of 390N. The calculated Lift-Drag-Ratio(L/D) is ~1.6 units, which is relatively low.
Closed wing had an average downforce of 1620N with a drag force of 680N. The calculated L/D Ratio is ~2.4, which is quite acceptable.
After some analysis, this wing is relatively good at lower speeds due to its high downforce and efficiency when closed, but it is quite inefficient at higher speeds when the wing is open. There is a good reduction in drag when the wing opens ~35%, which will allow for higher top-end speed, but it has a low L/D ratio when open, meaning extra drag is created, which could've been avoided. This is likely due to the two wings interfering with each other, causing turbulence and/or flow separation and vortices, leading to unnecessary drag. Further inspections, changes and adjustments are needed to mitigate this problem. In my next revision of this concept, I will look to create a wing which is more efficient at higher speeds and has a drag reduction closer to 20%, which is more common in the race car industry.