Flow visualization and pressure distributions in a model of the glottis with a symmetric and oblique divergent angle of 10 degrees
Flow visualization and pressure distributions in a model of the glottis with a symmetric and oblique divergent angle of 10 degrees
复制标题
DOI：
10.1121/1.1526468
复制
发表时间：
2003-01-01
影响因子：
2.4
通讯作者：
Afjeh, AA
中科院分区：
文献类型：
--
作者：
Shinwari, D;Scherer, RC;Afjeh, AA
对人类喉部进行建模可以提供对声门内的流动和压力的性质的了解。在这项研究中，声门内的压力和声门射流的研究是对称的，另一种情况下倾斜的发散声门。使用了具有可互换声带的喉的树脂玻璃模型（7.5倍真人大小）。每个声带至少有1个测压孔。最小声门直径保持恒定在0.04 cm。声门的夹角为10度。在一个案例中，声门是对称的。在另一个病例中，声门的倾斜度为15度。对于每种几何形状，使用3、5、10和15 cm H2O的跨声门压降。压力分布结果表明，对于斜向情况，声门入口处的跨通道压力显著不同，该结果复制了谢勒等人的另一项研究中的数据[J. Acoust.美国社会109，1616-1630（2001 b）]。使用激光片和接种气流的流动可视化表明声门内存在分离流动。对于对称声门，分离点似乎不随流量而变化，但对于倾斜声门，分离点随着流量的增加而在发散声门壁上向上游移动。对称和倾斜的情况下，出声声门射流偏离轴偏斜。激光片在下游区域显示出不对称的循环区域。声门射流的层流核心的长度小于约0.6 cm，并且随着流量的增加长度减小。结果表明，这里研究的声门上的驱动力显着不同的两侧声门（特别是在入口处的声门），和倾斜的声门射流特性需要考虑到建模和航空声学的目的。(C)2003年，美国声学学会。
Modeling the human larynx can provide insights into the nature of the flow and pressures within the glottis. In this study, the intraglottal pressures and glottal jet flow were studied for a divergent glottis that was symmetric for one case and oblique for another. A Plexiglas model of the larynx (7.5 times life size) with interchangeable vocal folds was used. Each vocal fold had at least 1 pressure taps. The minimal glottal diameter was held constant at 0.04 cm. The glottis had an included divergent angle of 10 degrees. In one case the glottis was symmetric. In the other case, the glottis had an obliquity of 15 degrees. For each geometry, transglottal pressure drops of 3, 5, 10, and 15 cm H2O were used. Pressure distribution results, suggesting significantly different cross-channel pressures at glottal entry for the oblique case, replicate the data in another study by Scherer et al. [J. Acoust. Soc. Am. 109, 1616-1630 (2001b)]. Flow visualization using a LASER sheet and seeded airflow indicated separated flow inside the glottis. Separation points did not appear to change with flow for the symmetric glottis, but for the oblique glottis moved upstream on the divergent glottal wall as flow rate increased. The outgoing glottal jet was skewed off-axis for both the symmetric and oblique cases. The laser sheet showed asymmetric circulating regions in the downstream region. The length of the laminar core of the glottal jet was less than approximately 0.6 cm, and decreased in length as flow increased. The results suggest that the glottal obliquity studied here creates significantly different driving forces on the two sides of the glottis (especially at the entrance to the glottis), and that the skewed glottal jet characteristics need to be taken into consideration for modeling and aeroacoustic purposes. (C) 2003 Acoustical Society of America.