Jet-surface interaction noise prediction with realistic chord lengths

Dawson, Martin, Lawrence, Jack, Self, Rodney and Kingan, Michael (2020) Jet-surface interaction noise prediction with realistic chord lengths. In AIAA Aviation 2020 Forum. (doi:10.2514/6.2020-2550).

Abstract

Several jet-surface interaction noise models have been created in the last decade based on analytical edge-scattering theory. These models have been validated against laboratory measurements of installed jet noise. To best match the theory, the scattering surfaces have tended to have very large chords. Therefore, measurements have been taken in the Doak Laboratory of installed jet noise using plates with chords that are in scale with that seen on current commercial jet airliners. As the chord is reduced there is a significant reduction in amplitude of low frequency jet-surface interaction noise. The OASPL polar directivity also transitions from approximately a cardioid to a dipole. Comparing to the jet-surface interaction noise model of Lyu & Dowling, the model increasingly over-predicts as chord is reduced, especially in the rear arc at high jet Mach numbers. Applying Roger & Moreau’s back-scattering theory improves the spectral shape at low frequencies and short chord lengths, but did not affect the over-prediction. Further work is therefore required to understand and correct the cause of the over-prediction by the model.

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