S2MA

Continuous-flow wind tunnel, Variable pressure, Mach 0.1 to Mach 3.0

S2 wind tunnel, general overview

 

• Modane S2, Continuous-flow wind tunnel, Variable pressure,
• Mach 0.1 to Mach 3.0
• An S2MA experiment is capable of providing an initial data-base within a matter of 3 to 4 months
• Global measurement approach using techniques such as 360° PSP and MDM
• Simple models with very few pressure taps
• Fast configuration changes
• Wall corrections validated with the large S1MA tunnel
• Extensively used by a number of worldwide customers

Measurement

Test range diagram

• Steady measurements = 154 analog channels, 16 bits A/D converter, digital lowpass filtering with a bandwidth from 0.01 to 10 Hz. Steady accuracy ±1 mV, resolution 0.3mV.
• Unsteady measurements = 64 analog channels at 100 kHz per channel. 12 bits A/D converter, digital lowpass filtering with a bandwidth from 0 to 20 kHz (if necessary the number of channels can be increased).
• Steady pressures = 992 channels (by DTC PSI®, system 8400) (On demand this number of pressure channels can be increased up to 1984).
• Automatic quality checks of the pressure measurement units.
• Real-time spectral analysis
• Automatic quality checks of the voltage measurement units.
• Real-time data processing.
• Model supports and tunnel wall interferences corrections.
• Measurement while one parameter is continuously varying.

Instrumentation and measurement methods

• Internal balances: 80 balances available and new ones manufactured on request.
• Wall-mounted balances with compressed air supply, for half-span models.
• Jet engine simulation (air turbine).
• Hot jet (pyrotechnic) or cold jet simulation (air pressure up to 150 bar and up to 15 kg/s air mass flow).
• Devices for air inlet tests.
• Airflow visualisations by shadowgraph, pigmented oils, acenaphtene sublimation, tufts, infrared thermography
• PIV
• PSP (Pressure Sensitive Paints).
• MDM (Model deformation Measurement)

Typical tests

Business jet test

• Longitudinal and lateral force tests.
• Air intakes (steady and unsteady measurement).
• Store release (jettison test and captive trajectory system).
• Dynamic stability tests.
• Buffeting and flutter tests.
• Nacelle/pylon/wing interference (blow/TPS nacelles).
• Fuselage aft en test (geometry effects, sting and jet interference).
• Transverse jet simulation on rolling models.
• Parietal pressures.

Absolute confidentiality-guarantee

Model preparation and tests in secure cells.
Numerous tests for foreign customers, all with confidentiality absolutely guaranteed.