WIND TUNNEL TEST RIG

Product Description

The Wind Tunnel is simple andsafe in operation.

It is supplied as a completeself-contained facility mounted on castors for ease of movement.

Main equipment comprises thetunnel with a two-component balance system and an air speed indicator.

Air enters the test sectionthrough a carefully designed contraction followed by an aluminum honeycomb flowstraightened designed to ensure that the flow is steady in both magnitude anddirection and has a flat transverse velocity profile.

A low angle diffuser at theoutlet end contributes to flow stability in the test section.

A five bladed fan is located atthe outlet of the diffuser section.

The fan is driven by an AC motorsupplied from an inverter speed control unit allowing smooth control of airspeed.

The parallel octagonal testsection is manufactured from clear acrylic and may be retracted on rails topermit unobstructed access to the models.

The two-component balanceconsists of a pair of balances supported on knife edges on mutuallyperpendicular axes parallel to and normal to the axial centre of the tunnel.

Lift and drag components of forceexerted on the models under test are balanced by sliding weights along the armsof the balance until a state of null deflection is reached.

Graduations in units of forceallow lift and drag to be read directly.

The complete assembly is linkedto a simple oil filled damping pot.

Models are mounted on the balancewithin the working section and a protractor with cursor allows angles ofincidence to be changed quickly and accurately while the tunnel is running.

The accuracy of the tunnel andits instrumentation make it suitable for undergraduate and simple researchwork.

Features:-

Contraction and diffuser:precision glass fiber moldings

Test section: clear acrylic,which retracts to permit access to the models.

Adjustment of models can be madewith the tunnel in operation.

Fan: Variable-speed motor drivenunit downstream of the working section permitting steeples control of airspeedbetween 0 and 26ms-1

Balance: Lift and drag

Lift “ 7.0N, Drag “ 2.SN,Sensitivity ±0.01 N

Air speed: Indicated on inclinedmanometer directly calibrated in m/s

Support structure: A strong steelframe including working surface and fitted with castors for easy movement

Demonstration and MeasurementCapabilities:-

A selection using the models andinstrumentation provided are:-

Investigation of the developmentof the boundary layer on a flat plate by measurement of the total headdistribution

Flow visualization studies aroundan aerofoil

Measurement of pressuredistribution around an aerofoil at various angles of attack

Measurement of pressuredistribution around a cylinder

Measurement of lift and drag onan aerofoil with leading edge slot and trailing edge flap

Velocity and pressuredistribution measurements using a Pitot static tube and yaw probe

Measurement of drag for aselection of models of different shapes but common equatorial diameter

Demonstration of flutter of anaerofoil

Calibration of the wind tunnelvelocity indicator using a Pitot static tube and inclined manometer

Investigation of the wake behinda cylinder or aerofoil using a wake survey rake

Technical Specifications:-

Suitable for undergraduate andsimple research work.

Working section: 304mm wide x304mm high x 457mm long (octagonal cross- section)

Contraction area ratio: 3:1

Motor rating: 1.SkW

Flow visualization studies aroundan aerofoil and cylinder

Measurement of pressuredistribution around an aerofoil at various angles of attack or around acylinder

Measurement of lift and drag onan aerofoil with leading edge slot and trailing edge flap

Velocity and pressuredistribution measurements using a pitot static tube and yaw probe

Measurement of drag for models ofdifferent shapes but common equatorial diameter

Demonstration of flutter of anaerofoil

Calibration of the wind tunnelvelocity indicator using a pitot static tube

Investigation of the wake behinda cylinder or aerofoil using a wake survey rake