Code: Civil-MCE-0123
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 an entrance flare. A flow straightener, three wire mesh screens, and 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 mounted on a steel table on wheels.
TYPICAL EXPERIMENTS
TECHNICAL DATA
Fan : | |||||
- | Diameter | : | 500 mm. | ||
- | Impeller | : | Single stage, aerofoil aluminum blade. | ||
Contraction area ratio | : | 7:1. | |||
Air velocity control | : | Inverter. | |||
Test Section | : | 300 mm x 300 mm x 600 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 (to be used with inclined water manometer above). | ||
- | Lift and drag | : | Two component balance for measurement of lift and drag. | ||
Power supply | : | 380 V 3 Ph 50 Hz. Other power supply is available on request. |