| |
|
AERODYNAMIC
DEPARTMENT |
|
|
5-METER LOW SPEED WIND TUNNEL T3
The T3 Institute of aviation Low Speed Wind
Tunnel is an atmospheric, closed-circuit tunnel with an open
test section of 5 meter diameter, and 6.5 m length which can
reach velocities of 57 m/s with a dynamic pressure of 2000 N/m2.
The Reynolds number per meter ranges from 0 to 3.8 x 106.
The flow in the test section is relatively uniform with a longitudinal
turbulence level of about 0.5 percent. Test section airflow
is produced by 7-m diameter 8-bladed fan powered by 1.5 MW direct
current motor.
Testing activities
- Wind tunnel testing of aircraft models for aerodynamic characteristics
of stability, manoeuvrability and pressure distributions,
- Aerodynamic load measurements on aircraft element models
(wings, horizontal and vertical tails, control surfaces, stores,
etc.),
- Hinge moment measurements on control surfaces,
- Flutter test of aircraft models - investigation of flutter
characteristics, vibration frequency, critical speed, damping
of vibration at subcritical speeds,
- Store trajectory tests including forced drop for cockpit
fairing and underwing attachments,
- Buffeting tests,
- Flow visualisation (tufts, smoke, fluorescent minitufts).
|
|
|
|
|
| 5-METER
LOW SPEED WIND TUNNEL T3 CHARACTERISTICS |
| Type of Wind Tunnel |
closed circuit, open test section |
| Max. speed, meter per second |
57 |
| Max. dynamic pressure, N/m2 |
2000 |
| Max. Reynolds number, per meter |
3.8 x 106 |
| Test gas |
air |
| Run time |
continuous |
| Test section size |
| diameter, m |
5.0 |
| length, m |
6.5 |
| Contraction ratio |
4.84 |
| Circuit length, m |
134 |
| Drive DC Elecric Motor |
| power, MV |
1500 |
| max. fan revolution, rpm |
500 |
| Model support |
struts, sting, floor mounting |
| Model
size |
| aircraft |
3.5 wing span |
| buildings, other |
3 m high or 2 m2 cross
section |
| Model positioning |
| angle of attack |
-40 ÷ +45o |
| or after 90o rotate of model on sting |
±90o |
| sideslip angle |
±180o |
| Airflow
properties in the test section |
| Turbulence factor measured on sphere |
TF = 1.22 |
| Turbulence intensity measured by anemometer |
τ = 0.5 % |
| Velocity field irregularity |
ΔV = ±0.5% |
| Airflow sweep angle
irregularity |
Δα, Δβ = ±0.5o |
|
