Improved predictions of trailing-edge noise using rapid-distortion theory and CFD data

Afsar, Mohammed (2019) Improved predictions of trailing-edge noise using rapid-distortion theory and CFD data. In: Sixteenth International Conference on Flow Dynamics, 2019-11-06 - 2019-11-08, Tohoku University.

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    Abstract

    We show the effect of correcting the acoustic spectrum formula for a high speed jet interacting with a trailing edge of a semi-infinite flat plate derived by Goldstein et al., (2017, J Fluid Mech. vol. 824, p. 477) using the Rapid-distortion theory (RDT). The correction involves using the next order term for the amplitude function in the WKBJ approximation for the scattered pressure. The high frequency roll-off of the acoustic spectrum predictions that we obtain using this correction are closer to experiment for low speed jets. In the talk we will discuss the role of using CFD data in the model.