Wind Tunnel - BMW
Transcript of Wind Tunnel - BMW
Wind Tunnel
AEROLAB
BMW Group AEROLAB.BMW Group Wind Tunnels.
BMW Aero-Acoustic Wind Tunnel
1980 1990 2000 2010
BMW Wind Tunnel Aschheim 1:1
FKFS 1:1
RUAG Model
Swift Model
S2A 1:1
BMW Group AEROLAB. Use of ExternalWind Tunnels withMovingGround Facility.
1995 2000 2005 2010
Pininfarina 1:1
AEROLAB
Wind Tunnel
Length 20mW
idth 14m
Height 11m
BMW Group AEROLAB. Plenum.
1
2
BMW Group AEROLAB. Nozzle Cross Section.
Nozzle Area 14m²
BMW Group AEROLAB. Rolling Road.
Width 3,20m
Length9,00m
BMW Group AEROLAB. Overall ViewAEROLAB.
BMW Group AEROLAB. Force Measurement.
CLr
CD
CLf
40%Shape & Proportions
30%Wheel / Wheelhouse
20%Underbody
10%Air Intakes
Total Drag 100%
BMW Group AEROLAB. Shares to Total Drag.
BMW Group AEROLAB. FlowSimilarity.
Test Speed:
Vehicle length 4,8 m
100 km/h
Vehicle length 2,4 m
200 km/hExample:
1:1-Vehicle 1:2-Model
1:2-Model
CD [-]
.29
stationary
BMW Group AEROLAB. Drag Measurement with StationaryWheels.
.29
rotating
.28
stationary
CD [-]
BMW Group AEROLAB. Drag Measurement with RotatingWheels.
BMW Group AEROLAB. Air Curtain.
Without Air Curtain With Air Curtain
.29
Air Curtain
.28.27
stationary
CD [-]
rotating
BMW Group AEROLAB. Drag Measurement with Air Curtain.
BMW Group AEROLAB. On-road Static Pressure Gradient.
Static Pressure
V
BMW Group AEROLAB. AEROLAB Static Pressure Gradient.
Static Pressure
.29
.18
Air Curtain „Gliding Fish“
.28.27
-35%-35%
stationary
CD [-]
rotating
BMW Group AEROLAB. Drag Measurement „Gliding Fish“.