Wind Tunnel

This is an open circuit Wind Tunnel which provides a region of controlled airflow into which models can be inserted. The propulsion is provided by a fan at downstream of working section.
The tunnel consists of bell mouth shaped entry to guide the air smoothly into settling chamber consisting of honeycomb and nylon mesh screens which filters and stabilizes the air flow. This follows working section or test section where various models can be tested. Two windows with acrylic sheet one each on either side will be provided for visual observation. Working section is followed by diffuser section, which reduces the dynamic pressure at the exit.
A three -blade fan coupled with D.C variable speed motor is used to produce desired wind velocity. A thyristorised motor control is used for smooth variation of air velocity.

SPECIFICATIONS :

1. Type : Open type Wind Tunnel.
2. Test Section : 300mm x 300mm x 1000 mm. long with two Perspex windows.
3. Blower Fan : 3 /10 blades M.S. /nylon fan.
4. Motor : 7.5 HP D.C shunt motor, 1500rpm.
5. Speed Controller : 3 phase, thyristor controller to give smooth Speed control.
6. Air Velocity : In test section - 1 to 30 m/sec.
7. Duct : Manufactured out of ms sheet.
8. Length of Tunnel : 4/5 meter.

INSTRUMENTATION:

1. LIFT & DRAG INDICATOR -
   1. Lift - Display: - 3 ½ digit, Least count: - 0.1 kg
      Range : - 20 kg
   2. Drag - Display: - 3 ½ digit, Least count: - 0.1 kg
      Range : - 20 kg
2. MANOMETERS: -
   1. Multitube Manometer : 500mm. Height, 500mm, width, 15 pvc tubes, 6mm, dia,
   2. Pitot tube : 100cm. Long chrome plated pipe tube, 3/8” dia.
3. WOODEN MODELS :-
   1. Aerofoil:
      1. Symmetrical
      2. Unsymmetrical. 150mm, width and 150mm.long with 15 piezometric tapping with 0-360 degree protractor.
   2. Cylindrical Model: 75mm, dia., 150mm long with piezometric tapping and 0-360 degree protractor.
   3. Spherical Model: - 65mm, dia.

   EXPERIMENTATION :-

   1. To study pressure distribution around a) Aerofoil b) Cylinder.
   2. To measure lift & drag on airfoil model, cylinder model & sphere model.