P.V.Lukianov On one model for aeroacoustics of viscous compressible gas. Part II. Noise of the near helicopter blade-vortex interaction |
Acoustic bulletin, Vol. 16 ¹ 3, (2013-2014) |
| A model of sound generation and propagation in an inviscid medium is used for the case of noise generation as a result of blade interaction with the Taylor's compact vortex. The quantitative estimates of acoustic characteristics for the near and far sound fields are obtained. The strongest blade-vortex interaction is marked at r̄=1 that corresponds to maximal nonuniformity of the velocity distribution in the Taylor's vortex. For comparatively small Mach's number (M=0.2), the essential decrease of generated noise level is observed at the blade tip. With the increasing distance between the blade and the vortex, the noise level distribution becomes smoother. This may serve the confirmation of experimental data on the possibility to control the generated noise in the vicinity of the blade tip. There are no sharp noise level changes observed at M=0.4. |
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KEY WORDS: sound generation by flow, the Taylor's vortex, blade-vortex interaction, the numerical-analytical methods |
| TEXT LANGUAGE: Russian |