MP 315D 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 ensures 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.

Instruction manual is also included.

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
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 (to be used with inclined water manometer above)
 - Sensors with digital display
 - Lift and drag Two component balance with model holder for measurement of lift and drag
Power supply 220 V, 1 Ph, 50 Hz. Other power supply is available on request.
OPTIONAL EQUIPMENT
OPTIONAL MEASURING ACCESSORIES
Part No. Part Name
MP 100-011M Multi port differential pressure digital display instead of inclined water manometer.
MP 315-003A Three component balance with digital display and model holder for measurement of lift drag and pitching instead of two component balance.
MP 330-110 Anemometer for velocity measurement telescopic handle
MP 330-111 Angle digital display for model angular position. It is to be attached to two or three component balance.
MP 330-114 Multitube inclined water manometer
MP 330-114D 16 points differential pressure sensor with sequential readings (To be used with computer)
MP 315-121 Pitot-static probe stainless steel
MP 315-122 Yaw probe three tube type with clamp
MP 315-125 Wake survey rake
MP 330-130 Smoke generator set
Additional Smoke fluid

 

OPTIONAL MODELS FOR LIFT AND DRAG
Part No. Part Name
Models for a study of lift drag and pitching include:
MP 315-011 Sphere plastics
MP 315-012 Hemisphere plastics
MP 315-013 Circular disc
MP 315-014 Circular ring
MP 315-015 Square plate
MP 315-016 Vane
MP 315-017 Cylinder plastics
MP 315-018 Streamlined shape plastics
MP 315-019 Aerofoil aluminium
MP 315-019L Aerofoil long aluminium
MP 315-030 Aerofoil with slot and flap aluminium
MP 315-030L Aerofoil with slot and flap long

 

OPTIONAL MODELS AND ACCESSROIES FOR INDIVIDUAL STUDY
Part No. Part Name
MP 315-053 Pressure wing aluminium
MP 315-055 Pressure cylinder plastics:
MP 315-057 Boundary layer plate with probe
MP 315-150

Computer Interface

Sensors with computer interface unit for key data acquisition instead of analog data measuring instruments.

This consists of computer computer interface unit pressure sensor rotary encoder and multiport differential pressure sensors 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

 

Net (unassembled) Shipping Dimensions WxLxH 55 x 290 x 76 cm.
Net Weight Approx. 130 kg.