Sound generation by rotor-vortex interaction in low Mach number flow

Obermeier, F.; Zhu, Kaiqi

doi:10.2514/3.46309

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…10 Though the vortices are very drastic simplifications of real flow turbulence, this semianalytical analysis of vortex sound has attracted the attention of many researchers as it is expected to be able to provide insights into the much more complicated turbulence-solid surfaces aeroacoustics. Typical examples of such analysis include those of Cannell and Ffowcs Williams, 11 Obermeier and Zhu, 12 and more recently of Howe. 13 In addition, Crighton 14 and Obermeier 15 investigated the sound generation when the vortex interacts with an infinite half plane and a circular cylinder, respectively, by using the method of matched asymptotic expansions.…”

Section: Introductionmentioning

confidence: 98%

Vortex sound under the influence of a piecewise porous material on an infinite rigid plane

Lau

Tang

2007

The Journal of the Acoustical Society of America

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The vortex dynamics and the sound generation by an inviscid vortex in the presence of a finite length porous material on an otherwise rigid plane are studied numerically in the present study in an attempt to understand the sound generation near the surface of a wall lining in a lined duct. The combined effects of the effective fluid density and flow resistance inside the porous material, and the length and thickness of the porous material on the sound generation process are examined in detail. Results obtained demonstrate the sound pressure is longitudinal dipole and show how seriously the above-mentioned parameters are affecting the vortex sound pressure under the influence of the porous material.

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Section: Introductionmentioning

confidence: 98%

Vortex sound under the influence of a piecewise porous material on an infinite rigid plane

Lau

Tang

2007

The Journal of the Acoustical Society of America

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“…For example, former studies [7,24] focus on the so-called vortexcutting noise, which is generated when a single discrete vortex impinges, but does not touch, or &&cuts'', the leading edge of the airfoil. These studies reveal that the major vortex dynamics is responsible for the generation of impulsive noise pulse in the far "eld but the single discrete vortical disturbance is too simple to model the excitation in real physical situations.…”

Section: Upstream Vortical Excitation Modelmentioning

confidence: 99%