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知道气管进出口压力,计算流经气管的空气流量似乎相当容易,然而问题并非如此简单。教课书上介绍的理论计算方法是根据热力学和流体力学原理计算空气流量的,而在现场使用中,往往需要进行多次的反复试验,才能确定合乎实际要求的流量。现今则可利用计算机来分析计算,求出长气管空气流量简明直观的图形解。首先,应知道与计算有关的仅三个无量纲参数:压力比、规范化管长和规范化流量密度。这样就可利用一曲线族图来计算流量。压力比定义是绝对大气压力与绝对进口
Knowing the pressure on the trachea, it seems fairly easy to calculate the air flow through the trachea, but the problem is not that simple. The theoretical calculation method introduced in the teaching book is to calculate the air flow according to the principles of thermodynamics and hydrodynamics. However, in field use, it often takes many repeated tests to determine the flow that meets the actual requirements. Now you can use the computer to analyze and calculate, find the air flow of the long tube simple and intuitive graphical solution. First, you should know only three dimensionless parameters involved in the calculation: pressure ratio, normalized tube length, and normalized flow density. This makes it possible to calculate the flow using a chart of curves. Pressure ratio is defined as absolute atmospheric pressure and absolute imports