The power spectrum and correlation of flow noise for an axisymmetric body in water

doi:10.1088/1674-1056/20/6/064302

Abstract Understanding the physical features of the flow noise for an axisymmetric body is important for improving the performance of a sonar mounted on an underwater platform. Analytical calculation and numerical analysis of the physical features of the flow noise for an axisymmetric body are presented and a simulation scheme for the noise correlation on the hydrophones is given. It is shown that the numerical values of the flow noise coincide well with the analytical values. The main physical features of flow noise are obtained. The flow noises of two different models are compared and a model with a rather optimal fore-body shape is given. The flow noise in horizontal symmetry profile of the axisymmetric body is non-uniform, but it is omni-directional and has little difference in the cross section of the body. The loss of noise diffraction has a great effect on the flow noise from boundary layer transition. Meanwhile, based on the simulation, the noise power level increases with velocity to approximately the fifth power at high frequencies, which is consistent with the experiment data reported in the literature. Furthermore, the flow noise received by the acoustic array has lower correlation at a designed central frequency, which is important for sonar system design.

Keywords: flow noise correlation analysis power spectrum

Received: 29 October 2010
Revised: 01 December 2010
Accepted manuscript online:

PACS:	43.30.Nb	(Noise in water; generation mechanisms and characteristics of the field)
	43.30.Lz	(Underwater applications of nonlinear acoustics; explosions)
	43.28.Ra	(Generation of sound by fluid flow, aerodynamic sound and turbulence)

Fund: Project supported by the National Natural Science Foundational of China (Grant No. 10774119), the Program for New Century Excellent Talents in University, China (Grant No. NCET-08-0455), the Natural Science Foundation of Shaanxi Province of China (Grant No. SJ08F07), and the Foundation of National Laboratory of Acoustic and the Foundation for Fundamental Research of Northwestern Polytechnic University, China (Grant No. 2007004).

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Li Xue-Gang (黎雪刚), Yang Kun-De (杨坤德), Wang Yong (汪勇) The power spectrum and correlation of flow noise for an axisymmetric body in water 2011 Chin. Phys. B 20 064302

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The power spectrum and correlation of flow noise for an axisymmetric body in water

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