Subsonic Wind Tunnel:
This type of tunnel are used for various operations at very low mach number. The speed limit for thsi is 480 km/h. It is of various types open-return type and closed return flow.
Specification :
Self-contained wind tunnel for the study of subsonic aerodynamics, complete with two- component balance system and air speed indicator
• Special features:
– Contraction and Diffuser: precision glass fibre mouldings
– Test Section: clear acrylic, which retracts to permit access to the models.
– Adjustment of models can be made with the tunnel in operation.
– Fan: Variable speed motor driven unit downstream of the working section permitting stepless control of airspeed between 0 and 26ms-1
– Balance: Lift and drag Lift
– 7.0N, Drag
– 2.5N, Sensitivity ±0.01N
– Air speed: Indicated on inclined manometer directly calibrated in m/s
– Support structure: A strong steel frame including working surface and fitted with castors for easy movement
• Suitable for undergraduate and simple research work.
• Working section: 304mm wide x 304mm high x 457mm long (octagonal cross- section)
• Contraction area ratio: 3:1
• Motor rating: 1.5kW
• A user instruction manual is supplied
• Optional models and instrumentation allow:
– Investigation of the development of the boundary layer on a flat plate by measurement of total head distribution
– Flow visualisation studies around an aerofoil
– Measurement of pressure distribution around an aerofoil at various angles of attack or around a cylinder
– Measurement of lift and drag on an aerofoil with leading edge slot and trailing edge flap
– Velocity and pressure distribution measurements using a pitot static tube and yaw probe
– Measurement of drag for models of different shapes but common equatorial diameter
– Demonstration of flutter of an aerofoil
– Calibration of the wind tunnel velocity indicator using a pitot static tube
– Investigation of the wake behind a cylinder or aerofoil using a wake survey rake
