WIND TUNNEL TEST RIG

About WIND TUNNEL TEST RIG

Specification:

WINDTUNNEL TEST RIG

The Wind Tunnel is simple and safe inoperation.

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

Main equipment comprises the tunnelwith a two-component balance system and an air speed indicator.

Air enters the test section through acarefully 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 the outletend contributes to flow stability in the test section.

A five bladed fan is located at theoutlet 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 test sectionis manufactured from clear acrylic and may be retracted on rails to permitunobstructed access to the models.

The two-component balance consists ofa pair of balances supported on knife edges on mutually perpendicular axesparallel 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 force allowlift and drag to be read directly.

The complete assembly is linked to asimple 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 and itsinstrumentation make it suitable for undergraduate and simple research work.

Features:-

Contraction and diffuser: precision glass fiber moldings

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

Adjustment of models can be made withthe tunnel in operation.

Fan: Variable-speed motor driven unit downstream of the workingsection permitting steeples control of airspeed between 0 and 26ms-1

Balance: Lift and drag

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

Air speed: Indicated on inclined manometer directly calibrated in m/s

Support structure: A strong steel frame includingworking surface and fitted with castors for easy movement

Demonstration and Measurement Capabilities:-

A selection using the models and instrumentation providedare:-

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

Flow visualization studies around anaerofoil

Measurement of pressure distributionaround an aerofoil at various angles of attack

Measurement of pressure distributionaround a cylinder

Measurement of lift and drag on anaerofoil with leading edge slot and trailing edge flap

Velocity and pressure distributionmeasurements using a Pitot static tube and yaw probe

Measurement of drag for a selectionof 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 behind acylinder or aerofoil using a wake survey rake

Technical Specifications: -

Suitable for undergraduate and simpleresearch work.

Working section: 304mm wide x 304mm high x 457mm long (octagonalcross- section)

Contraction area ratio: 3:1

Motor rating: 1.SkW

Flow visualization studies around anaerofoil and cylinder

Measurement of pressure distributionaround an aerofoil at various angles of attack or around a cylinder

Measurement of lift and drag on anaerofoil with leading edge slot and trailing edge flap

Velocity and pressure distributionmeasurements 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 behind acylinder or aerofoil using a wake survey rake