Experimental Investigation of Jet-Flap-Interaction Noise Sensitivity due to varying flap parameters at a UHBR Engine/High-Lift-Wing installation

Jente, Christian; Pott-Pollenske, Michael; Boenke, Dirk; Buescher, Alexander; Goldhahn, Iris

doi:10.2514/6.2018-3788

Cited by 6 publications

(1 citation statement)

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“…In order to study the effects of flight stream on jet-surface interaction, and its dependence on flap parameters and jet/wing distance, numerical simulations are performed of the experiments carried out at the DLR Aeroacoustic Windtunnel Braunschweig (AWB) on the F16 straight high-lift-wing with an Ultra High Bypass Ratio (UHBR) nozzle [26]. In a limited span in the vicinity of the engine, the leading edge had no slat deployed in order to avoid intersection with the engine.…”

Section: Coaxial Jet / High-lift Wing Interactionmentioning

confidence: 99%

Numerical Investigation of Installed Jet Noise Sensitivity to Lift and Wing/Engine Positioning

Angelino

Moratilla-Vega

Howlett

et al. 2019

25th AIAA/CEAS Aeroacoustics Conference

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As the turbofan engines of modern transport aircraft have increasingly larger bypass ratios, by necessity to avoid longer undercarriage, the engine must be installed closer to the wing. This then has the potential of interaction between the jet flow and a deployed flap. This interaction can be an important noise source when the high-lift systems are deployed, as at approach and take-off. Investigating the parameters that have a strong influence on the installation noise penalty can help in identifying noise reduction measures. In this paper Wall-Modelled Large Eddy Simulations (WMLES), combined with the Ffowcs Williams and Hawkings (FW-H) sound extrapolation method, are performed to reproduce three experimental cases, with the aim of isolating the different contributions of flap angle and trailing-edge/jet-axis distance h. The first case (DOAK), consisting of a single jet installed near a horizontal flat plate, confirms the fundamental mechanisms of jet-surface interaction and jet-surface reflection in the absence of lift. The second case (DLR-F16), with a coaxial jet installed under a high-lift wing, reveals the trailing-edge/jet-axis distance h as the dominant parameter, with a possible influence of the flap angle at low frequencies. The third case (SYMPHONY) is used to study the interaction of a coaxial jet with a full aircraft geometry using Fourier decomposition of the pressure near-field to analyse the effects on sound sources and radiation.

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Section: Coaxial Jet / High-lift Wing Interactionmentioning

confidence: 99%