Rational Function Representation of Flap Noise Spectra including Correction for Reflection Effects

Acoustic measurements for large model engineover-the-wing (EOW) research configurations having both conventional and powered lift applications were taken for flap positions typical of takeoff and approach and at locations simulating flyover and sideline. The results indicate that the noise ,is shielded by the wing and redirected above it, making the EOW concept a prime contender for quiet aircraft. The large-scale noise data are in agreement with earlier small-model results. Below the wing, the EOW configuration is about 10 PNdB quieter than the engine-under-the-wing externally-blownflap for powered lift, and up to 10 dB quieter than the nozzle alone at high frequencies for conventional lift applications.

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Engine-over-the-wing noise research

Reshotko

Goodykoontz

Dorsch

1973

6th Fluid and PlasmaDynamics Conference

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Rational Function Representation of Flap Noise Spectra including Correction for Reflection Effects

Cited by 1 publication

References 13 publications

Engine-over-the-wing noise research

Engine-over-the-wing noise research

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