A computational study of asymmetric glottal jet deflection during phonation.

Two-dimensional numerical simulations are used to explore the mechanism for asymmetric deflection of the glottal jet during phonation. The model employs the full Navier-Stokes equations for the flow but a simple laryngeal geometry and vocal-fold motion. The study focuses on the effect of Reynolds number and glottal opening angle with a particular emphasis on examining the importance of the so-called "Coanda effect" in jet deflection. The study indicates that the glottal opening angle has no substantial effect on glottal jet deflection. Deflection in the glottal jet is always preceded by large-scale asymmetry in the downstream portion of the glottal jet. A detailed analysis of the velocity and vorticity fields shows that these downstream asymmetric vortex structures induce a flow at the glottal exit which is the primary driver for glottal jet deflection.

二维数值模拟被用于探究发声过程中声门射流不对称偏转的机制。该模型对流动采用完整的纳维 - 斯托克斯方程，但喉部几何形状和声带运动较为简单。这项研究聚焦于雷诺数和声门张开角度的影响，尤其着重于检验所谓的“附壁效应”在射流偏转中的重要性。研究表明，声门张开角度对声门射流偏转没有实质性影响。声门射流的偏转总是先出现于声门射流下游部分的大规模不对称。对速度场和涡量场的详细分析表明，这些下游的不对称涡结构在声门出口处诱导出一种流动，这是声门射流偏转的主要驱动因素。