F4 hypersonic wind tunnel
Arc heated wind tunnel
Hypersonic, hypervelocity, up to 6 km/s
Impulse generator up to a power of about 150 MW.
The usual blow down duration obtained is 200 ms.
Test conditions can reach a total pressure of 500 bar together with an enthalpy of 16,5 mJ/kg (reduced H/RTo = 200).
- The working gas (air or nitrogen) contained in the arc chamber (adjustable from 6 to 15 litres) is brought to the total conditions by a high intensity electric arc. The electrical energy is supplied to the electrodes by an impulse generator up to a power of about 150 MW.
- The usual blow down duration obtained is 200 ms. The test conditions can reach a total pressure of 500 bar together with an enthalpy of 16,5 mJ/kg (reduced H/RTo = 200).
- 4 contoured nozzles allow tests at various values of dissociation parameter (roL) and rarefaction parameter (M/Re 1/2 );
- Models are mounted on a sting holder (angle of attack range 0 to 50°, sideslip range 20°), the range can be adapted on request with cranked stings.
- Force measurements (6 components) on complete space plane models at high angle of attack
- Force measurements (3 components) on capsule models
- Hinge moment measurements on model elements and control surfaces
- Wall pressure measurements
- Heat flux measurements on model
- Models sized and equipped for test in F4 are suitable for testing in the S4MA cold hypersonic wind tunnel.
- Data acquisition system with 72 channels. Each one has an analog conditioner, an amplifier filter, a 16 bit 50 kHz analog to digital converter and a buffer memory of 64000 samples.
- Pressure measurements with rapid response transducers
- Force measurements (three or six components) with inertia load compensation (7 accelerometers on the balance and/or on the model)
- Wall temperature measurements with thermocouples for heat flux and total enthalpy calculation
- Schlieren visualisations : one view per shot or high speed camera (10,000 frames/s)
- Laser diode infrared absorption spectroscopy technique (LDAS) for direct free stream velocity, rotational temperature and nitrogen oxide concentration measurements
- On request:
- Free stream and shock layer emission spectroscopy (Optical Multi-channel Analyser Spectrometer)
- Free stream spectroscopy with Electron Beam Fluorescence technique (EBF)
- Streak camera for flow field analysis
- Model preparation and test carried out in protected areas.
- Absolute confidentiality guarantied.