on drag reduction for automotive vehicles
Brizotti, Patrick Rambaud and Florian Visentin
Our 3D mesh with 600,000 cells is fine enough to capture the
longitudinal vortex with good results compared with experimental
values. We did simulations with and without the blowing control system
for different velocity inlet and blowing velocity.
We notice a good drag reduction when the blowing
velocity is equal to the velocity inlet. This drag reduction varies
with respect to the velocity of the flow around the car and the maximun
drag reduction value that we got is about 6% which involves an
efficiency of 1.8 (for a velocity inlet of 20 m/s and 50 m/s).
The results that we get with the blowing
velocity equal to twice the velocity inlet are not what we expected
because depending on the blowing velocity, the drag is sometimes
slightly increased and sometimes slightly decreased. Thus we advice to
change the angle of the blowing system depending on the velocity used
to burst the vortices.
We would like to thank the following people for their help to the
M. Kourta and all the teachers staff of ENSEEIHT
- M. Alexei Stoukov
for his precious help whenever we had computing problems
Thanks to the hydraulic department at ENSEEIHT
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