!!TOP!! Download Mp3 Unity (acoustic)
Channing Chambers
Contur+ is an acoustical ceiling installed in concealed T-grid. The ceiling tiles offer a monolithic yet fully demountable surface with perforations extending to the edge of the tile. Contur+ acoustic tiles are installed from below the T-grid, requiring only 63mm installation depth. Contur+ is tested and approved as ventilation ceiling with concealed air inlet.
- Verified Environmental Product Declaration (EPD)
- Danish Indoor Climate Labelling
- 100% recyclable material
- Fireresistant
- Repaintable without loss of acoustics
- Listed to be used in Nordic Swan Ecolabelled buildings
Trapping of vortices in a cavity has been explored in recent years as a drag reduction measure for thick airfoils. If, however, trapping fails, then oscillation ofthe cavity flow may couple with elastic vibration modes ofthe airfoil. To examine this scenario, the effect of smallamplitude vertical motion on the oscillation of the shearlayer above the cavity is studied by acoustic forcing simulating a vertical translation of a modified NACA0018profile. At low Reynolds numbers based on the chord(O(10^4)), natural instability modes of this shear layer areobserved for Strouhal numbers based on the cavity width oforder unity. Acoustic forcing sufficiently close to the natural instability frequency induces a strong non-linearresponse due to lock-in of the shear layer. At higher Reynolds numbers (above 10^5) for Strouhal number 0.6 orlower, no natural instabilities of the shear layer and only a linear response to forcing were observed. The dynamicalpressure difference across the airfoil is then dominated byadded mass effects, as was confirmed by numerical simulations.
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