Modeling laryngeal aerodynamics requires specification of the glottal geometry. Changing the glottal exit radius alters the intraglottal pressure distributions in the converging glottis [Scherer et al., J. Acoust. Soc. Am. >110, 2267–2269 (2001)]. This study examined the effects of the glottal entrance radius on the intraglottal pressure distributions for divergent angles of 5°, 10°, 20°, 30°, and 40°. Glottal airflow and minimal glottal diameter were held constant at 73.2 cm3/s and 0.02 cm, respectively. The computational code FLUENT was used to obtain the pressure distributions. Results suggest that a smaller glottal entrance radius tends to (1) lower the transglottal pressure (reduce glottal flow resistance), although this is angle dependent, (2) make the pressure dip near the glottal entrance more negative in value, (3) increase the slope of the pressure distribution just upstream of the glottal entrance, and (4) make the initial pressure recovery (rise) in the glottis steeper. A general empirical equation for transglottal pressure as a function of radius, angle, and separation point location is offered. These results suggest that glottal entrance curvature for the divergent glottis significantly affects the driving pressures on the vocal folds, and needs to be well specified when building computational and physical models.
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机译:对喉头的空气动力学建模需要指定声门的几何形状。改变声门出口半径会改变会聚声门的声门内压力分布[Scherer et al。,J. Acoust。 Soc。上午。 > 110 strong>,2267–2269(2001)]。这项研究检查了声门入口半径对5°,10°,20°,30°和40°发散角时声门内压力分布的影响。声门气流和最小声门直径分别保持恒定,分别为73.2 cm 3 sup> / s和0.02 cm。计算代码FLUENT用于获得压力分布。结果表明,较小的声门入口半径倾向于(1)降低声门压力(降低声门流动阻力),尽管这与角度有关,(2)使声门入口附近的压力降值更负,(3)增加声门入口上游压力分布的斜率,(4)使声门的初始压力恢复(上升)更加陡峭。提供了经声门压力随半径,角度和分离点位置变化的一般经验公式。这些结果表明,发散声门的声门入口曲率会显着影响声带上的驱动压力,因此在建立计算模型和物理模型时需要明确说明。
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