Three-dimensional nature of the glottal jet
Three-dimensional nature of the glottal jet
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DOI：
10.1121/1.3299202
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发表时间：
2010-03-01
影响因子：
2.4
通讯作者：
Bruecker, Christoph
中科院分区：
文献类型：
--
作者：
Triep, Michael;Bruecker, Christoph
人类发声的因素尚未完全了解。即使是具有对称声门开口面积的正常人类发声仍然是广泛研究的主题。其中，已经表明流体动力学对发声过程有很强的影响。声门射流的完整特征尚未完成。时间分辨测量和可视化的三维（3D）流下游的人类声带是困难的，如果不是不可能在体内执行。因此，通常使用具有简化的声带形状和运动轮廓的机械和数值模型。本文给出了一个3：1放大的动态声门模型（cam模型）在水回路中的三维流动结构的进一步结果，推广了早期的工作[M. Triep等人（2005年）。Exp. Fluids 39，232-245]。该模型模仿声门间隙的3D轮廓的时间变化，而水流减少了1/140的顺序的特征频率。声带下游的非定常流动过程是可视化的慢动作，并通过粒子成像技术进行了详细分析。可视化结果显示了复杂的三维流动行为，纵向射流收缩和轴切换。此外，在发声振荡周期的时间依赖性的流量进行了详细测量。它示出的压力损失减少的存在下的第二个收缩的声门下游的形式的心室褶皱，并观察到，在这种情况下，射流是稳定在发散阶段的周期。(C)2010年美国声学学会。[DOI：10.1121/1.3299202]
The factors contributing to human voice production are not yet fully understood. Even normal human phonation with a symmetric glottal opening area is still the subject of extensive investigation. Among others, it has already been shown that fluid dynamics has a strong influence on the vocal process. The full characterization of the glottal jet has not been accomplished yet. Time-resolved measurement and visualization of the three-dimensional (3D) flow downstream the human vocal folds are difficult if not impossible to perform in vivo. Therefore, it is common to use mechanical and numerical models with a simplified shape and motion profile of the vocal folds. In this article, further results regarding the 3D flow structure obtained in a 3: 1 up-scaled dynamic glottis model (cam model) in a water circuit are given, extending earlier work [M. Triep et al. (2005). Exp. Fluids 39, 232-245]. The model mimics the temporal variation in the 3D contour of the glottal gap while water flow reduces the characteristic frequencies by the order of 1/140. The unsteady flow processes downstream of the vocal folds are visualized in slow motion and analyzed in detail via particle imaging techniques. The visualization results show complex 3D flow behavior of lengthwise jet contraction and axis switching. In addition, the time-dependent flow rate during the phonatory oscillation cycle is measured in detail. It is shown that the pressure loss is decreased in the presence of a second constriction downstream of the glottis in form of ventricular folds and it is observed that for this case the jet is stabilized in the divergent phase of the cycle. (C) 2010 Acoustical Society of America. [DOI: 10.1121/1.3299202]