| 1. | A laser to measure noise - Zoom in the Lab |
| | Laser Doppler Velocimetry (LDV).... |
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| 2. | Propulsion aérobie et autres systèmes énergétiques - moyens d'essais - Offre technologique Onera |
| | Laser Doppler Velocimetry (LDV) ,... |
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| 3. | Air-Breathing Propulsion and Other Energetic Systems : Testing Facilities - Onera's Technological Offer |
| | Laser Doppler Velocimetry (LDV) ,... |
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| 4. | Aero-Thermo-Acoustic Bench (B2A) : Liners Absorption Performance Measurements - Onera's Technological Offer |
| | KeywordsLDV, Acoustic Impedance, Acoustic Intensity, In-Flow Acoustic Measurements, Aeronautic Liner, Noise Reduction, High-Temperature Acoustic Absorptive Materials.. Advantages. Facilities :... Wind tunnel with anechoic outlet, LDV (2D).. Samples :. Testing cell... LDV system. Expert :. |
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| 5. | A cryogenic combustion research test bench - Operation with Oxygen / Hydrogen - ONERA / DEFA-EN |
| | Two-component LDV... |
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| 6. | Unsteady Flows - ONERA / DAAP-EN |
| | LDV measurements)... |
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| 7. | 15-Pethieu.pdf |
| | In-duct flow 2D LDV measurements are realised on a test-bench which consist in a wind tunnel provided by loudspeakers located upstream of a square test cell where a liner is mounted.... Key words : hydrodynamic modes, aero-acoustic, boundary layer, LDV, Galbrun * Romain.... So, our purpose is to measure acoustics fields near liner in flow to bring to the fore the presence of hydrodynamic modes due to upstream acoustic waves, particularly at the Helmholtz frequency, frequency for which the material absorbs generally incident acoustic waves (national project COMATEC with CNRS laboratories and SME's). The LDV technique coupled with a Eulerian-Lagrangian approach (developed at Onera [ 2,4 ]), has been applied to know the acoustic behaviour of a porous ceramic liner composed of elementary cells of 1 square mm and is 79 mm in thickness (liner supplied by LAUM laboratory).... |
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| 8. | Towards the Use of Boundary Element Method |
| | Secondary air injection goes through a silicon oil atomizer and carries the seeding particles necessary for the LDV measurements.... Velocity measurements are done by LDV.... This is typical of spectra obtained from LDV, where the complete measurement data set is re-sampled before the FFT algorithm is applied.... |
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| 9. | Norske lysark 2001 |
| | Next Steps · Perform the experiments in : - a wind tunnel flow configuration (better controlled turbulence field, extended Re range) - use of hot wire anemometry instead of LDV to better resolve the high frequency region - measurement on the complete velocity field to investigate the influence on the turbulent decay / dissipation... |
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| 10. | WIGNER-VILLE DISTRIBUTION AS A TOOL FOR EXTRACTING PERTINENT INFORMATION FROM COMPLEX PHENOMENA |
| | I.L.S sizes compared with LDV sizes... |
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