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LRI-AAST: L8 – Wind tunnels laboratory
Wind tunnels laboratory (part of the aviation division) serves mainly for oriented and applied research in the field of aerodynamics
and fluid mechanics. It plays an irreplaceable role during the research, development and certification of aircraft, as regulations
still require verification of certain properties by performing wind tunnel measurements. The development of measuring techniques
and the modernization will enable more accurate and faster data collection and will also enable the expansion of the possibilities
of investigating given phenomena in the flow. This will make the performed measurements more efficient and will increase the
scientific level. New technologies such as AFC will enable the design of new, more aggressive forms of transport, leading
to higher operational efficiencies and thus fulfilling increasingly stringent environmental standards defined by the politicians.
LOW-SPEED WIND TUNNEL LABORATORY
Location
Low-speed wind tunnel laboratory is located at the Prague 9 – Letnany VZLU campus, Beranovych 13
Parameters
Closed circuit atmospheric wind tunnel of continuous run (3m LSWT):
- Tunnel can now be used to measure aerodynamic characteristics of scale models
- Circular test section of 3 m dia x 3 m in length
- Maximum flow velocity 80 m/s with cooling
- Maximum flow velocity 90 m/s without cooling
- Cooling system is able to maintain a constant temperature in the tunnel working section during measurement at a tolerance of ± 1 °C
- Max. deviation of local velocity from mean velocity less than 0.5 %
- Characteristic turbulence intensity 0.3
- Tunnel to measure scale models´ aerodynamic characteristics and probe calibration
- Circular test section of 1.8 m dia x 1.75 m in length
- Maximum velocity 55 m/s
- Max. deviation of local velocity from mean velocity less than 0.5 %
- Characteristic turbulence intensity 0.5 %
- Tunnel for probe calibration
- Circular test section 0.6 m dia
- Maximum velocity 65 m/s
- Max. deviation of local velocity from mean velocity less than 1%
- Characteristic turbulence intensity 0.5%
HIGH-SPEED WIND TUNNEL LABORATORY
Location
High-speed wind tunnel laboratory is located in Prague 9 – Palmovka
Parameters
An atmospheric intermittent suck-down wind tunnel (A):
- Tunnel designed to measure scale models´ aerodynamic characteristics
- It features a device to excite vibrations in model tested
- Four working sections can be made up:
| TUNNEL | A1 | A2 | A3 | A4 |
|---|---|---|---|---|
| Working section(m) | 0,9 x 0,6 | 0,6 x 0,6 | 0,6 x 0,6 | 0,4 x 0,8 |
| Mach number | 0,2 – 0,75 | 0,3 – 1,1 | 1,4 – 2,1 | 0,15 – 0,9 |
| Head (MPa) | 0,1 | 0,1 | 0,1 | 0,1 |
| Re # (SAT) | 2.106 | 2.106 | 2.106 | 3.106 |
| Time of run (s) | 8 | 8 | 6 | 10 |
| Angle of attack (deg) | -12 +12 | -12 +12 | -12 +12 | -18 +20 |
| Walls of test section | closed | erforated | closed | slotted |
| Wall opening (%) | 22,5 | 0 – 10 |
A calibration atmospheric aerodynamic intermittent-run wind tunnel (C)
- Tunnel is designed for small diameter probe calibration and tests
- Working section is 0.12 x 0.12 m
- Manipulable Mach numbers up to M 1.1
- Tunnel is fitted out with device to excite flow air vibration to change inlet pressures for non-steady pressure measurement
- Virtually uninterrupted run type due to a small size of working section
- Tunnel is designed to measure aerodynamic characteristics of scale models of small size and to calibrate pressure pick-ups
- Mach number range 0.2 – 2.1
- Working section size 0.24 x 0.2 m
- Perforated walls
