Subsonic Reverse Wind Tunnel Description and Specifications for Lab Tenders
Subsonic Reverse Wind Tunnel.
Subsonic Reverse Wind Tunnel
This wind tunnel generates an airstream
(60m/s max.) in a transparent test section (300 x 300 mm). Different
accessories (aerofoil section, static tube) can be installed in the test
section to test the subsonic aerodynamic laws.
This wind tunnel has a reduced volume and is fitted into laboratories
and test floors without necessitating installation or civil engineering
works.
Teaching objectives
It allows some very demonstrative experiments in aerodynamics to be carried out, such as.
Measuring the speed of air flow and plotting speed profiles in different sections of the wind tunnel test section.
Measuring the distribution of pressure on the underside and upper side of an aerofoil section.
Study of the distribution of pressure around a cylinder.
Measuring lift, air resistance and lift
moment with an aerodynamic balance, 2 or 3 components on different
aerofoil sections according to the incidence (complementary equipment).
Technical specifications
A test section comprising two vertical
glass surfaces, one of which is entirely hinged to allow access to the
interior of the test section. The upper part has a lengthwise slit
fitted with joints to allow a probe to be attached. A movement system
with one, two or three axes can be inserted on the test section.
A plenum chamber, area 2.25 m², fitted with a filter bag, a honeycomb and 3 grids of bronze wire gauge.
A nozzle, assuring an excellent quality of air flow at the entrance
to the test section. It has been designed bidimensionally, considering a
pressure flow, with correction of the turbulent boundary layer.
A diffuser downstream of the test section allows an important part
of the pressure loss to be recuperated, and allows renewed disturbances
in the airstream to be avoided.
A high performance centrifugal fan is driven by an induction motor.
The adjustment of the fan’s rotation speed is carried out thanks to a
frequency variator.
Fine dust removing filter bags (Ashrae gravimetric efficiency 97.5%).
Three grids in bronze wire gauge.
A honeycomb, thickness 90 mm, 8mm mesh.
A trolley mounted on rails can accommodate a vertical moving unit for sensors.
The wind tunnel is completely made from painted sheet metal.
Aerodynamic test section: 300 x 300 x 1500mm (area, length).
Variable speed between 3 and 60m/s.
Variation of total pressure: below ±0.50%, hence speed below ±0.25%.
Turbulence intensity on the U component: 0.15%.
Fan contraction ratio: 25.
Contraction ratio: 25.
Turbulence rates:<0.5% to 40m/s.
Motor power: 12kW at 2000Vm.
Equipment package
Standard equipment.
Complementary optional equipment .
Constant temperature system with associated equipment
Aerodynamic balance 2 components and 3 components.
Pitot tube.
Multi-tube manometers.
Flow visualisation system.
Dimensions and weight
8300 x 1950 x 2250 mm and 450 kg (approx.).
Essential requirements
Electricity supply: three-phase 380/440 V, 50Hz (other voltages on request)
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