| 基于大涡模拟和Kirchhoff积分方法的孔腔流动发声机理分析 |
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| 引用本文： | 张楠,沈泓萃,朱锡清,姚惠之.基于大涡模拟和Kirchhoff积分方法的孔腔流动发声机理分析[J].船舶力学,2011,15(4):427-434. |
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| 作者姓名： | 张楠 沈泓萃 朱锡清 姚惠之 |
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| 作者单位： | 中国船舶科学研究中心,江苏,无锡,214082;中国船舶科学研究中心,江苏,无锡,214082;中国船舶科学研究中心,江苏,无锡,214082;中国船舶科学研究中心,江苏,无锡,214082 |
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| 摘 要： | 孔腔流动与流激噪声是流声耦合研究领域的重要课题。文章基于大涡模拟方法与Kirchhoff积分,探讨了水中孔腔流动的发声机理。由孔腔流动振荡模态分析可知,在水中较低马赫数情况下,流体共振模态极难存在,故而流体动力振荡是产生孔腔流激噪声的根源,从而揭示了孔腔流激噪声形成的机理。进而又基于Kirchhoff控制面积分与物体壁面积分,辨识了偶极子声源和四极子声源对于流激噪声影响量级以及频谱分布规律,并结合流体动力声源的数学表达、Lighthill应力张量的频谱分析和壁面效应分析,指出了孔腔中涡旋对于流场脉动量声学效应的输运作用是孔腔流激噪声传播的成因,从而揭示了孔腔流激噪声传播的机理。
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| 关 键 词： | 孔腔 流激噪声 机理 大涡模拟 Kirchhoff积分 |
Analysis of the mechanism of cavity flow induced noise with large eddy simulation and Kirchhoff method integral |
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| ZHANG Nan,SHEN Hong-cui,ZHU Xi-qing,YAO Hui-zhi.Analysis of the mechanism of cavity flow induced noise with large eddy simulation and Kirchhoff method integral[J].Journal of Ship Mechanics,2011,15(4):427-434. |
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| Authors: | ZHANG Nan SHEN Hong-cui ZHU Xi-qing YAO Hui-zhi |
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| Institution: | ZHANG Nan,SHEN Hong-cui,ZHU Xi-qing,YAO Hui-zhi(China Ship Scientific Research Center,Wuxi 214082,China) |
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| Abstract: | Cavity flow and flow induced noise are two important issues in the field of flow-acoustic coupling.The mechanism of cavity flow induced noise in water is studied by the large eddy simulation(LES) and Kirchhoff integral in this paper.The cavity flow oscillation analysis shows that the fluid-resonance mode is impossible in the condition of low Mach number in water,and the fluid-dynamic oscillation determines the generation of cavity flow induced noise.After that,the effects of dipole and quadrupole sources on... |
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| Keywords: | cavity flow induced noise mechanism large eddy simulation(LES) Kirchhoff integral |
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