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首页> 外文期刊>Journal of Biomechanics >Influence of glottic aperture on the tracheal flow
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Influence of glottic aperture on the tracheal flow

机译：声门孔径对气管流量的影响

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The extra-thoracic mouth-throat area has a major influence on the aerosol delivery to the proximal or peripheral intra-thoracic airways. To characterize the particle deposition in this area, it is important to investigate first the flow structures in this crucial-in relation to the aerosol deposition-region. The glottis, which is delimited by the vocal cords and therefore has the narrowest passage, generates a laryngeal jet and a reverse flow downstream the glottis. It is generally assumed that the glottis has different shapes and cross-sectional areas at different moments during the respiratory cycle and also depends on the average inspiratory flow rate. Therefore, the influence of a circular glottal aperture, with a cross-sectional area of go mm(2) and an elliptical and triangular shape, both with an area of 45 mm on the flow is investigated. However, the area of the circular aperture is twice as big as the area of the elliptical one, it has almost no influence on the flow structures. On the other hand, the triangular glottal aperture shifts the laryngeal jet in the direction of the posterior wall, and generates two pairs of counter rotating secondary vortices downstream the glottis, where the circular and elliptical only aperture generates one pair of vortices. The difference in pressure drop is more dominated by the cross-sectional area than by the shape of the glottis. This suggests the need for rendering geometry of future upper airway models even more realistic as the appropriate three dimensional (3D) medical imaging techniques are becoming available. (c) 2005 Elsevier Ltd. All rights reserved.
机译：胸外口咽区域对气雾剂向近端或外周胸腔气道的气溶胶输送有重大影响。为了表征该区域中的颗粒沉积，重要的是首先研究与气溶胶沉积区域有关的至关重要的流动结构。声门由声带界定，因此具有最窄的通道，会在声门下游产生喉头射流和逆流。通常假设声门在呼吸周期的不同时刻具有不同的形状和横截面积，并且还取决于平均吸气流速。因此，研究了横截面积为mm（2）的椭圆形和三角形（面积均为45 mm）的圆形声门孔径对流动的影响。然而，圆形孔的面积是椭圆形孔的面积的两倍，它几乎对流动结构没有影响。另一方面，三角形的声门孔径使喉头射流向后壁方向移动，并在声门下游产生两对反向旋转的次级涡流，其中仅圆形和椭圆形的孔径会产生一对涡流。压降的差异主要由横截面积决定，而不是由声门的形状决定。这表明，随着适当的三维（3D）医学成像技术的问世，对将来的上呼吸道模型的几何渲染的需求变得更加现实。 （c）2005 Elsevier Ltd.保留所有权利。

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