FRANÇAIS
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Technology Transfer
Aero-Thermo-Acoustic Bench (B2A):
Liners Absorption Performance Measurements
Applications
> Aeronautics and Space Launchers
- Exhausters.
- Liners.
- High temperature acoustic absorptive materials.
Keywords
- LDV, Acoustic Impedance, Acoustic Intensity, In-Flow Acoustic Measurements, Aeronautic Liner, Noise Reduction, High-Temperature Acoustic Absorptive Materials.
Advantages
- Unique non-intrusive acoustic testing of non-local reaction liners at high speed and hot flow.
- Local influence of acoustic treatment.
Testing
- Measurement of normal acoustic impedance and absorbed power of flat porous materials (liners) with grazing flow by a non intrusive measurement technique (Laser Doppler Velocimetry).
- Database to validate aero-acoustic models: mean and acoustic velocities, pressure, intensity and impedance fields in high speed flow.
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Facilities: Wind tunnel with anechoic outlet, LDV (2D).
- Samples:
- Honeycomb, rigid foam, fibre material etc. (local or non-local reaction behaviour).
- Test size 30 x 150 mm², maximum thickness 100 mm.
- Flow conditions: M < 0.6, 300°C.
- Acoustic excitation by loudspeakers: > 140 dB (315 - 5000 Hz).
Wind tunnel with anechoic outlet
Testing cell
LDV system
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