The occurrence of the Coanda effect in pulsatile flow through static models of the human vocal folds
The occurrence of the Coanda effect in pulsatile flow through static models of the human vocal folds
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DOI：
10.1121/1.2213522
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发表时间：
2006-08-01
影响因子：
2.4
通讯作者：
Plesniak, Michael W.
中科院分区：
文献类型：
--
作者：
Erath, Byron D.;Plesniak, Michael W.
研究通过单侧扩散器和静态发散声襞模型的脉动流，以确定喉部粘性驱动流不对称的相关性。该模型的尺寸是实际尺寸的 7.5 倍，流量也进行了缩放以匹配雷诺数和斯特劳哈尔数以及经喉压降。雷诺数在 0-2000 之间变化，流体振荡频率对应于 100 和 150 Hz 的实际尺寸。特别令人感兴趣的是脉动流场中附着于边界壁的声门流倾斜的发展，或康达效应，及其对言语的影响。当流动分离等粘性效应很重要时，声带在发声周期的各个阶段形成发散通道。研究发现，对于小于 20 度的发散角，当力函数的加速度为零且流动达到最大速度时，会发生流动对声带壁的附着。对于 40 度的发散角，完全分离的中央射流永远不会附着在声带壁上。就柯恩达效应对语音中声源贡献的影响进行了推论。 (c) 2006 年美国声学学会。
Pulsatile flow through a one-sided diffuser and static divergent vocal-fold models is investigated to ascertain the relevance of viscous-driven flow asymmetries in the larynx. The models were 7.5 times real size, and the flow was scaled to match Reynolds and Strouhal numbers, as well as the translaryngeal pressure drop. The Reynolds number varied from 0-2000, for flow oscillation frequencies corresponding to 100 and 150 Hz life-size. Of particular interest was the development of glottal flow skewing by attachment to the bounding walls, or Coanda effect, in a pulsatile flow field, and its impact on speech. The vocal folds form a divergent passage during phases of the phonation cycle when viscous effects such as flow separation are important. It was found that for divergence angles of less than 20 degrees, the attachment of the flow to the vocal-fold walls occurred when the acceleration of the forcing function was zero, and the flow had reached maximum velocity. For a divergence angle of 40 degrees, the fully separated central jet never attached to the vocal-fold walls. Inferences are made regarding the impact of the Coanda effect on the sound source contribution in speech. (c) 2006 Acoustical Society of America.