The unit is a wheeled study bench of the performance of various aerodynamic profiles in subsonic conditions. The driving force emulating the high altitude wind is provided by an axial fan. The computerized version includes the real time of data acquisition. The unit is supplied with a technical manual that describes all the components, installation, commissioning and operating procedures, together with various suggested exercises.
TRAINING PROGRAM
• Wind speed control and tunnel calibration
• Qualitative experiments in various conditions (linear, stall, turbulence, etc.) using wool profiles and threads
• Pressure distribution along the profile
• Determination of the position of the barometric center
• Pressure variation center for each axis
• Distribution of air speed according to the attack angle
• Determining the lifting force varying the attack angle
• Determining the dragging force varying the attack angle
• Calculating the lift and drag coefficients
• Lift and drag coefficient curves
• Efficiency diagram as a function of the attack angle
• Polar curve Lift vs Drag
• Comparison between different profiles
TECHNICAL SPECIFICATIONS
• Fiberglass main body with transparent Plexiglas test chamber; internal diameter 290 mm, length 550 mm; chamber pressure: 15 ÷ 80 mm of water
• Mounted on a steel frame with wheels
• Axial fan driven by an AC motor; speed: 0 ÷ 2900 rpm
• 3 kW three-phase asynchronous motor, 0 ÷ 2900 rpm (includes also an inverter for electronic speed control)
• Unit for measuring the pressure in the test chamber
• N. 2 differential micromanometers
• Electric panel equipped with: main switch, start and stop button
• Electric panel equipped with: main switch, motor speed control knob, start and stop button, lift and resistance
force indicator
• Visualization of fluid veins by wool threads
• Pitot tube to measure the average velocity of the fluid vein: 30 m/s
• Pressure transducer for the wind inside the tunnel
2-component electronic balance
• Lift (L), Drag (D), Momentum (M) measured through load cells
• Knob to adjust the inclination of the model
• Frame equipped with antivibration
Set of test profiles
Profiles for measuring the resistance of various bodies in a fluid vein:
• Aerodynamic chuck
• Spherical profile
• Wing profiles: NACA 0012, NACA 0006, NACA 661-212, NACA 4412 series
Data acquisition software
It displays data from the control panel and includes a signal conditioning and A/D conversion unit. It also detects and analyzes the CD and CL coefficients according to the attack angle.
Unit for inspection of the vacuum and pressure around the wing
The unit consists of:
• NACA 0012 series profile with 10 pressure taps
• NACA 4412 series profile with 10 pressure taps
• Pressure gauge with 10 piezometric tubes
Unit for measuring the actual air conditions
Allows you to monitor and measure conditions with more accurate accuracy.
It is mounted on an easily transportable device and includes:
• Barometer dial: diameter 85 mm, 960-1050 mbar
• Hygrometer dial: diameter 85 mm, 0-100% RH
• Thermometer: from -30 to + 50 °C, with zero reset button
Smoke/fog machine
• Power 900W
• Output distance: up to 4 meters
• Fog output: 70 m³/min
