仿魚(yú)體柔性變形運(yùn)動(dòng)流噪聲特性研究
[Abstract]:Fish swimming is characterized by low noise and high efficiency. The swinging of fish body can be abstracted and characterized as a flexible deformation motion on the wall. Flexible deformation will induce complex vortex flow field structure, and the formation mechanism and characteristics of flow noise are different from conventional problems to a great extent. Taking the NACA0012 airfoil developed by the National Aviation Advisory Commission of the United States as the research object, a numerical model for simulating flexible deformation is established considering the demand of flow noise calculation. Based on the theory of acoustic analogy, the characteristics of the flow noise are obtained, the influence mechanism of the flexible deformation convection noise is revealed, and the directivity of the flow noise radiation field is obtained. The results show that the flow field evolution of complex vortex system induced by flexible deformation motion is the main source of flow noise, and the total sound pressure level of flow noise decreases with the increase of distance under different azimuths. The radiation noise reaches the maximum value and the noise direction is the most similar to the radiation field of the dipole sound source.
【作者單位】: 北京機(jī)電工程研究所;
【分類號(hào)】:TB53
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