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- W2022302510 abstract "Acoustic and aerodynamic measurements were performed in NLR's Small Anechoic Wind Tunnel on the air curtain concept, which is intended for landing gear noise reduction. The idea of this concept is to apply an upstream blowing slot to deflect the flow around a landing gear (component), thus reducing the local flow speeds and therefore the aerodynamically generated noise. Prior to the wind tunnel tests, a design study was carried out to assess the possible benefit of an air curtain and to define the test set-up. For the subsequent proof-of-concepts tests, two-dimensional half-models were mounted on an endplate which was attached to the lower edge of the wind tunnel nozzle. Blowing was applied through a slot in the endplate, upstream of the model. Microphone array and PIV measurements were performed to characterize the acoustics and aerodynamics of the air curtain. Tests were done for different wind tunnel speeds, blowing speeds, slot geometries and model geometries. For the relatively quiet baseline half-models in the present tests, broadband noise reductions of 3-5 dB were obtained using an air curtain with normal blowing (i.e. perpendicular to the main flow). The noise reductions could be increased to 5-10 dB by oblique blowing (30° upstream) or by applying a small flow deflector directly before the blowing slot. For full models larger noise reductions are anticipated." @default.
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- W2022302510 date "2009-05-11" @default.
- W2022302510 modified "2023-10-06" @default.
- W2022302510 title "Reduction of Landing Gear Noise Using an Air Curtain" @default.
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- W2022302510 doi "https://doi.org/10.2514/6.2009-3156" @default.
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