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SUBSONIC WIND TUNNEL, Downstream Fan

Code: Civil-MCE-0122

SUBSONIC WIND TUNNEL, Downstream Fan.

GENERAL DESCRIPTION

The wind tunnel is an open circuit down stream fan type designed for studying the subsonic aerodynamics. It is to be used with optional accessories and models below.

The air enters the tunnel via a wire mesh screen and a flow straightener. A high contraction ratio section ensure uniform velocity across the transparent test section. Downstream of the working section is a low angle diffuser which terminates at the tunnel fan. The diffuser and contraction sections have a high quality internal finish to minimize the boundary layer effects. The fan impeller blades are of an aerofoil design cast aluminum to ensure maximum aerodynamic efficiency and minimum turbulence. Fan speed is adjustable by an inverter.

Four equally spaced static pressure taps are connected to a manifold to minimize effects from a model. Air speed is indicated by an inclined manometer and a calibration graph. Models are mounted on two components balance support with digital display for measurement of drag and lift. Model holder can be rotated to allow quick change on the angle of incidence. This angle is indicated on an angular scale.

The tunnel is on a frame with adjustable footings for table top mounting

TYPICAL EXPERIMENTS

Pressure and velocity measurement.
Estimation of drag coefficients of various bodies, eg. sphere, hemisphere, disc, streamlined shape etc.
Estimation of drag and lift coefficients of an aerofoil.
Pressure distribution around an aerofoil or a cylinder.
Investigation of boundary layer at a flat plate by measuring total head distribution.
Stream lines visualization using a smoke generator.
Wakes behind models.

TECHNICAL DATA

Fan :
-	Diameter	:	300 mm.
-	Impeller	:	Single stage, aerofoil blade.
Contraction area ratio		:	9:1.
Air velocity control		:	Inverter.
Test section		:	150 mm x 150 mm x 450 mm long, transparent on three sides.
Maximum air velocity		:	Over 30 m/s.
Measuring instruments
-	Water manometer	:	Twin type.
-	Wind velocity	:	Multiple taps contraction section differential pressure with velocity calibration graph.
-	Lift and drag	:	Two component balance for measurement of lift and drag.
Power supply		:	220 V 1 Ph 50 Hz. Other power supply is available on request.

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