Computational aeroacoustics of phonation, part II: Effects of flow parameters and ventricular folds.
Computational aeroacoustics of phonation, part II: Effects of flow parameters and ventricular folds.
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DOI：
10.1121/1.1506694
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发表时间：
2002-10
期刊：
影响因子：
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通讯作者：
Cheng Zhang;Wei Zhao;S. Frankel;L. Mongeau
中科院分区：
文献类型：
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作者：
Cheng Zhang;Wei Zhao;S. Frankel;L. Mongeau
结果描述的第二部分正在进行的研究，旨在进行直接的数值模拟发音过程中的translaryngeal流量。使用精确的数值方案可以直接计算辐射声，而不需要声学模拟模型。我们的目标是更好地理解这类流动，以及发声中涉及的基本声音生成机制。本文研究了声门下压和声门振荡频率对近场流场和远场声的影响。还研究了振荡声门区下游心室褶皱存在的影响。结果表明，声门下压和振荡频率对喷流的涡结构、壁面压力和切应力以及声辐射都有影响。射流冲击心室褶皱引入了额外的偶极子源，类似于在腔体上的掠流问题中观察到的偶极子源。
The results are described of the second part of an ongoing study aimed at performing direct numerical simulations of translaryngeal flows during phonation. The use of accurate numerical schemes allows the radiated sound to be calculated directly, without the need for acoustic analogy models. The goal is to develop a better understanding of this class of flow, and of the basic sound generation mechanisms involved in phonation. In the present study, the effects of subglottal pressure and of glottal oscillation frequency on the near-field flow and farfield sound were investigated. The effects of the presence of the ventricular folds downstream of the oscillating glottal region were also examined. The results highlighted the effects of subglottal pressure and oscillation frequency on the jet vortical structure, wall pressure and shear stress, and sound radiation. Jet impingement on the ventricular folds introduced additional dipole sources similar to those observed in problems involving grazing flows over cavities.