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首页> 外文期刊>European Journal of Mechanics, B. Fluids >Simulation of airflow fields and microparticle deposition in realistic human lung airway models. Part I: Airflow patterns
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Simulation of airflow fields and microparticle deposition in realistic human lung airway models. Part I: Airflow patterns

机译：在现实的人肺气道模型中模拟气流场和微粒沉积。第一部分：气流模式

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摘要

In Part I, transient and steady laminar airflow fields were simulated with an in-house finite volume code for realistic upper airway models subject to different inlet conditions and geometric features. Axial velocities and secondary flows were compared at key time levels during the acceleration/deceleration phase of inhaled air and for steady-state inhalation. The main results can be summarized as follows. Considering two acceleration and deceleration time levels during transient inhalation as well as steady-state inhalation generating the same inlet Reynolds number, Re{sub}(in-mean) = 1201, the airflow patterns are quite similar. However, stronger axial and secondary velocities occur at all upper branch locations during flow deceleration because of the dynamic lingering effect. In general, the axial velocity profiles at steady state are very close to those at the point of deceleration. Variations in upper airway geometry, e.g., in-plane vs. out-of-plane configurations, have a significant effect on the airflow fields, although the primary airflow structures are similar in both idealized and more realistic airway configurations. The type of velocity inlet condition and existence of cartilaginous rings also influence the flow field; however, their impact is less important than changes in spatial angles.
机译：在第一部分中，使用内部有限体积代码对瞬态和稳定层流气流场进行了模拟，以针对受不同进气条件和几何特征影响的实际上呼吸道模型。在吸入空气的加速/减速阶段以及稳态吸入期间的关键时间水平，比较了轴速度和二次流量。主要结果可总结如下。考虑到瞬态吸入期间的两个加速和减速时间水平以及稳态吸入产生相同的入口雷诺数Re {sub}（均值）= 1201，气流模式非常相似。但是，由于动态的滞留效应，在减速过程中，所有上部分支位置都出现了较强的轴向和次级速度。通常，稳态时的轴向速度曲线非常接近减速点的速度。尽管主要气流结构在理想的和更现实的气道配置中相似，但上呼吸道几何形状的变化（例如，平面内与平面外配置）会对气流场产生重大影响。速度入口条件的类型和软骨环的存在也影响流场。但是，它们的影响不如空间角度的变化重要。

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