Effect of plate trailing edge deformations on jet flow and noise : an LES investigation

Horner, Colby and Sescu, Adrian and Afsar, Mohammed Z. and Collins, Eric (2021) Effect of plate trailing edge deformations on jet flow and noise : an LES investigation. In: Eighteenth International Conference on Flow Dynamics, 2021-10-27 - 2021-10-29, Virtual Event.

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Abstract

One approach to reduce jet noise generated by rectangular jets is to include flat surfaces that are parallel to the jet axis, but previous experimental work indicated that there is an increase in the noise generated by these configurations, mainly associated with the effect that the plate trailing edge exerts on the flow. In this work, we use large eddy simulations to investigate the potential of trailing edge deformations to reduce jet noise. We consider a high aspect ratio rectangular nozzle exhausting a jet over a flat surface in different configurations, and estimate the noise propagating to the farfield. Because of the high aspect ratio of the rectangular nozzle, we approximate the jet as being two-dimensional, and use periodic boundary conditions in the spanwise direction. For the configurations that we considered here, the trailing edge deformations did not seem to affect the noise significantly; an overall sound pressure level in the order of 1-2 dB was observed for some selected cases.

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