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“.