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Unsteady behavior of flow in a scaled-up vocal folds model

机译:声带放大模型中流动的非稳态行为

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摘要

Measurements of the fluid flow through a scaled-up model of the human glottis are presented to determine whether glottal flow may be approximated as unsteady. Time- and space-resolved velocity vector fields from digital particle image velocimetry (DPIV) measurements of the flow through the gap between two moving, rigid walls are presented in four cases, over a range of Strouhal numbers: 0.010, 0.018, 0.035, 0.040, corresponding to life-scale f0 of 30, 58, 109, and 126 Hz, respectively, at a Reynolds number of 8000. It is observed that (1) glottal flow onset is delayed after glottal opening and (2) glottal flow shutoff occurs prior to closure. A comparison between flow through a fully open, nonmoving glottis and that through the moving vocal folds shows a marked difference in spatial structure of the glottal jet. The following features of the flow are seen to exhibit strong dependence on cycle frequency: (a) glottal exit plane velocity, (b) volume flow, (c) vortex shedding rates, and (d) vortex amplitude. Vortex shedding appears to be a factor both in controlling flow resistance and in cycle-to-cycle volume flow variations. All these observations strongly suggest that glottal flow is inherently unsteady.
机译:提出了通过人声门的放大模型进行的流体流量的测量,以确定声门流量是否可以近似为不稳定。在四种情况下,通过数字粒子图像测速(DPIV)测量通过两个运动的刚性壁之间的间隙的流动的时间和空间分辨速度矢量场,其斯特劳哈尔数范围为0.010、0.018、0.035、0.040 ,对应于雷诺数为8000的寿命尺度f0分别为30、58、109和126 Hz。观察到,(1)声门打开后血流开始延迟,(2)声门关闭发生。关闭之前。通过完全开放的,不动的声门的血流与通过声带的运动的血流之间的比较表明,声门喷口的空间结构存在明显差异。流动的以下特征显示出对循环频率的强烈依赖性:(a)声门出口平面速度,(b)体积流动,(c)涡旋脱落率和(d)涡旋振幅。涡流脱落似乎是控制流阻和周期间体积流量变化的一个因素。所有这些观察结果强烈表明,声门流动本质上是不稳定的。

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