Near-wall aerodynamic response of an acoustic liner to harmonic excitation with grazing flow
- 146 Downloads
The near-orifice aerodynamic response of a single degree of freedom acoustic liner to tonal and multi-tonal excitation with grazing flow was experimentally studied. A high-magnification PIV setup was designed to provide dense 2D velocity field measurements above an orifice of the liner. The resonator near-orifice velocity dynamics near and far from resonance were shown to be significantly different, with dynamic velocity scales well captured by a lumped-element model that was also satisfactorily applied to multi-tonal forcing cases. The effects of varying the forcing acoustic sound pressure level and the tangential flow velocity scale (the friction velocity) were investigated. It was observed that a “rough-wall” analogy was not suited to account for the induced mean aerodynamic effects, but that, under certain conditions, a “transpiration wall” analogy may be of interest.
This project has partly received funding from the Clean Sky 2 Joint Undertaking under the European Union’s Horizon 2020 research and innovation program under Grant agreement no. 681856—ASPIRE. The authors wish to thank Delphine Sebbane for her technical assistance and expertise on the B2A duct and Airbus for manufacturing the acoustic liner.
- Baumeister KJ, Rice EJ (1975) Visual study of the effect of grazing flow on the oscillatory flow in a resonator orifice. Tech. rep., NASAGoogle Scholar
- Cummings A (1986) The effects of grazing turbulent pipe-flow on the impedance of an orifice. Acta Acust United Acust 61(4):233–242Google Scholar
- Heuwinkel C, Piot E, Micheli F, Fischer A, Enghardt L, Bake F, Röhle I (2010) Characterization of a perforated liner by acoustic and optical measurements. In: 16th AIAA/CEAS aeroacoustics conference, American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2010-3765
- Jiménez J (2004) Turbulent flows over rough walls. Annu Rev Fluid Mech 36(1):173–196. https://doi.org/10.1146/annurev.fluid.36.050802.122103 MathSciNetCrossRefzbMATHGoogle Scholar
- Morse PM, of America AS, of Physics AI (1948) Vibration and sound, vol 2. McGraw-Hill, New YorkGoogle Scholar
- Motsinger R, Kraft R (1991) Design and performance of duct acoustic treatment. In: Aeroacoustics of flight vehicles: theory and practice. Volume 2: Noise Control, vol 2Google Scholar
- Rienstra SW, Hirschberg A (2018) An introduction to acoustics. Eindhoven University of Technology. http://www.win.tue.nl/~sjoerdr/papers/boek.pdf
- Roche JM, Leylekian L, Delattre G, Vuillot F (2009) Aircraft fan noise absorption: DNS of the acoustic dissipation of resonant liners. In: 15th AIAA/CEAS aeroacoustics conference (30th AIAA aeroacoustics conference), American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2009-3146
- Rogers T, Hersh A (1976) The effect of grazing flow on the steady state resistance of square-edged orifices. In: Aeroacoustics: fan noise and control; duct acoustics; rotor noise, p 43Google Scholar