ACE wind tunnel technical specification

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 configurationStandard configuration
GeneralTypeSingle return closed-circuitSingle return closed-circuit
Test sectionShapeRectangularRectangular
DimensionsLength 4750 mm,
Width 2300 mm,
Height 2200 mm
Length 4750 mm,
Width 2300 mm,
Height 2200 mm
Contraction ratio77
Turbulence level (%)0.2 at 40 m/s0.2 at 40 m/s
Rolling roadDimensionsLength 3010 mm,
Width 1500 mm
SpeedUp to 40 m/s
Temperatureregulated
Boundary layerSuctionYesYes
FanPower250 kW250 kW
SpeedUp to 40 m/sUp to 40 m/s
ModelsScaleUp to 60%100%
StrutAdjustable in X
Wheel supportsAdjustable in X and Y
Yaw+ / – 6°From 0 to 20° Automatic
Steer
Pitch, rollRemote control (software) Laser controlledRemote control (software)
MeasurementBalancesInternal chassis balance 6 components,
Additional balance 3 components,
Wheel balances (drag)
Platform-balance
PressureZOC 64xZOC 64x
Wheel speedYesYes
SoftwaresEOLE 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:

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.

The flow visualization

Flow visualization in ACE wind tunnel

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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About the Author

Romain Nicolas

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