高频通气模式下人体呼吸过程的CFD 模型及模拟

摘要

The respiratory disease inpatients cannot be spontaneous breathing in the treat‐ment ,most patients rely on breathing machine to maintain the body′s normal metabolism . This research projects aimed to use computational fluid dynamics (CFD) method to establish modal and simulate the flow fluid of human respiratory with high frequency ventilation .We have established an geometry modal from mouth to lung and a mathematics model for the calculation of the fluid flow in the respiratory .Then to simulate the pressure and velocity based on the modals .Results indicates that respiratory internal air as the change of breathing rate of the corresponding change ,in the process of change ,fluid turbulent happened in the throat because of section changed .By increasing the air velocity and breathing rate ,can in‐crease the turbulent air flows within the respiratory tract ,thereby improve the efficiency of air exchange .%呼吸系统疾病患者在治疗中不能进行自主呼吸，需要借助于呼吸机维持机体正常新陈代谢。为研究高频通气模式下人体的呼吸过程，应用计算流体动力学（C FD ）方法，建立了一个从口腔到肺部的三维C FD模型，对高频通气模式下，人体呼吸道内部的压力场和流速场进行数值模拟研究。结果表明：增加通气频率可有效增加气体在呼吸道内部流动时的湍动，从而改善气体的传质交换效率。