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

    A dual an axial flow fans delivers air through a diffuser, aluminum tube flow straigthener, three wire mesh screens and a high contraction ratio section to ensure uniform velocity across the transparent test section. The diffuser and contraction sections have a high quality internal finish to minimize the boundary effects. The fan impeller blades are of  an aerofoil design cast aluminum to ensure maximum aerodynamic efficiency and minimum turbulence. The fan speed is adjustable by an inverter. 

    Four equally spaced static pressure taps are connected to a manifold to minimize effects from a model and air speed is indicated by an inclined manometer and a calibration graph. Models are mounted on two components load cell support with digital diplay 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 wind tunnel is mounted on a steel table on wheels.

  • Pressure and velocity measurement.
  • Estimation of drag coefficients of various bodies, eg. sphere, hemisphere, disc, plate, streamlined shape etc.
  • Estimation of drag lift and pitching coefficients of an aerofoil.
  • Pressure distribution around an aerofoil or a cylinder.
  • Effects of instability of a “flutter Wing”.
  • Investigation of boundary layer at a flat plate by measuring total head distribution.
  • Stream lines visualization using a smoke generator.
  • Wakes behind models.
Fan  :              
 - Diameter : 630 mm.          
 - Impeller : Single stage, aerofoil aluminum blade.      
Contraction area ratio : 7:1.          
Test Section : 300 mm x 300 mm x 600 mm long, transparentor on three sides.  
Maximum air velocity : Over 60 m/s.        
Air velocity control : Inverter.          
Measuring instruments              
 - Water manometer : Twin type.          
 - Wind velocity : Contraction section differential pressure with inclined water manometer and 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.  
- MP 330-003   Three component balance for measurement of lift drag and pitching instead of two component balance.
- MP 330-005   Velocity (differential pressure) digital display.    
- MP 330-110   Anemometer for velocity measurement.      
- MP 330-111   Angle digital display for model angular position.    
- MP 330-114   Multitube inclined water manometer.      
- MP 330-114D   16 point differential pressure sensor with sequential readings instead of multitube inclined water manometer.
- MP 330-121   Pitot-static probe stainless steel.      
- MP 330-122   Yaw probe three tube type with clamp.    
- MP 330-125   Wake survey rake.        
- MP 330-130   Smoke generator set.         
OPTIONAL MODELS              
Models for a study of lift drag and pitching include:        
 -  MP 330-011   Sphere          
 -  MP 330-012   Hemisphere          
 -  MP 330-013   Circular disc          
 -  MP 330-014   Circular ring          
 -  MP 330-015   Square plate          
 -  MP 330-016   Vane          
 -  MP 330-017   Cylinder          
 -  MP 330-018   Streamlined shape        
 -  MP 330-019   Aerofoil          
 -  MP 330-025   Model air plane        
 -  MP 330-026   Model automobile        
 -  MP 330-030   Aerofoil with slot and flap        
 - MP 330-050   Flutter wing aluminium aerofoil on steel frame.    
 - MP 330-053   Pressure wing aluminium        
      -  Number of taping points       
 - MP 330-055   Pressure cylinder plastics        
      -  Number of tapping points      
 - MP 330-057    Boundary layer plate with probe.      
 - MP 330-150    Computer Interface        
    This package consists of computer interface unit software and required accessories for:
  Control of wind velocity            
  Display of:              
      -  Wind velocity lift drag pitching moment and angle of attack.  
      -  Coefficient of lift drag and pitching moment.    
      -  Pressure distribution.