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ACE wind tunnel technical specification
car-engineer english version car-engineer version française

ACE wind tunnel technical specification

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ACE (Aero Concept Engineering) is a French company based in Magny-Cours and which provides a complete aerodynamic consultancy and development service. It includes a wind tunnel, a CFD expertise, CAD design, 3D digitalization, machining and composites design.

Wind tunnel specification

Racing car configuration Standard configuration
General Type Single return closed-circuit Single return closed-circuit
Test section Shape Rectangular Rectangular
Dimensions Length 4750 mm,
Width 2300 mm,
Height 2200 mm
Length 4750 mm,
Width 2300 mm,
Height 2200 mm
Contraction ratio 7 7
Turbulence level (%) 0.2 at 40 m/s 0.2 at 40 m/s
Rolling road Dimensions Length 3010 mm,
Width 1500 mm
Speed Up to 40 m/s
Temperature regulated
Boundary layer Suction Yes Yes
Fan Power 250 kW 250 kW
Speed Up to 40 m/s Up to 40 m/s
Models Scale Up to 60% 100%
Strut Adjustable in X
Wheel supports Adjustable in X and Y
Yaw + / – 6° From 0 to 20° Automatic
Steer
Pitch, roll Remote control (software) Laser controlled Remote control (software)
Measurement Balances Internal chassis balance 6 components,
Additional balance 3 components,
Wheel balances (drag)
Platform-balance
Pressure ZOC 64x ZOC 64x
Wheel speed Yes Yes
Softwares EOLE VIEW,
Live-timing results,
graphs,
analysis,
test comparisons,
DRAGLIVE,
Live-timing results,
on screen and on the wall of the test section,
automatic saving on files and DVD.

The analysis of test results will not be limited to treatment of aerodynamic forces and can also help identifying the flow structure.

The wind-tunnel data acquisition system is associated to in-house developed softwares.
It allows:

  • the most appropriate kind of runs,
  • real-time visualization of the results,
  • personalized output files or documents.

Wind tunnel pressure sensorsPressure sensors

With the multiplexed pressure sensor, associated to homemade specific software, the user can measure up to 64 values at a time. Then, the flow can be studied on every part of the vehicle, external (wing, flap, underbody …) or internal (cooling systems).

Characterization of the cooling

In parallel with the wind-tunnel, Aero Concept Engineering has an aerodynamic test bed for testing cooling elements or internal flow of small dimensions. It also allows models to size the radiators in order to obtain adequate permeability, compared to a scale model.

Flow visualization in ACE wind tunnelThe flow visualization

The flow visualization is an experimental means of examining the flow pattern around a body or over its surface. The primary advantage of such a method is the ability to provide a description of a flow over a model without complicated data reduction and analysis.

The PIV

The Particle Image Velocimetry (PIV) is an optical method which consists in recording images of illuminated particles within the flow-field. The PIV technique provides a quantitative, instantaneous, whole-field visualization and two-dimensional description of the flow.

PIV technique in wind tunnel
Source: ACE
Romain’s opinion:

A wind tunnel is not a facility owned by every manufacturer or motorsport team. Hence, they need to rent services in facilities like ACE one. It goes with some expertise that is mandatory for pre-processing the tests, running it and post processing it. How big the competition is in the aerodynamic testing field? On which criteria the choice of a partner is made (cost, experience, test capabilities …)?

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