24th Congress of International Council of the Aeronautical Sciences, 29 August-3, September 2004, Yokohama, Japan
Paper ICAS 2004-3.4.1

A MECHANISM OF SOUND GENERATION FROM VORTEX PREDOMINANT FLOWS

I. Men’shov, Y. Nakamura
Nagoya University, Japan

Keywords: vortexf low, instability, sound generation

The paper addresses vortex instability as a possible source mechanism of wake vortex sound. A family of circular planar vortices that are compressible and homentropic and have zero total circulation are studied. The linear normal mode analysis reveals the existence of unstable modes that can radiate sound in the far field. Numerical simulation of the non-linear stage shows the vortex breakdown and subsequent sound emission.

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