模拟气流通过气动阀:简要回顾与实验案例研究

Gustavo Koury Costa
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引用次数: 0

摘要

可压缩流量模型通常用于描述通过气动阀的空气流量。由于预测粘性损失的困难,这些模型最终依赖于实验确定的系数。对于不同的流体速度,提出了不同的方程,以声波流体速度作为参考标记。然而,有人可能会质疑,一种更简单的方法,其中流体被认为是不可压缩的,在典型的工业应用范围内是否仍然会产生良好的结果。此外,几乎所有模型都假定阀门输出压力随时间而减小,就像在排放过程中一样。本文综述了一些有代表性的一维可压缩流动模型,并讨论了仅基于泄流的方程的适用性。两个实验回路,其中空气储层加压,随后,减压,用于不同的流动模型之间的比较。结果表明,在实际气动应用中,较简单的一组方程仍能产生可接受的结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Modelling Air Flow through Pneumatic Valves: A Brief Review with an Experimental Case Study
Compressible flow models are commonly used for describing air flow through pneumatic valves. Because of the difficulties in predicting viscous losses, these models ultimately rely on experimental determination of coefficients. Different equations have been proposed for different fluid speeds, having the sonic fluid velocity as a reference mark. However, one might question whether a much simpler approach, where the fluid is considered as incompressible, would still give good results within the typical range of industrial applications. Moreover, practically all models presuppose that the valve output pressure decreases in time, as in a discharge process. This paper reviews some representative one-dimensional compressible flow models and discusses the appropriateness of using equations based solely on discharging flows. Two experimental circuits, where an air reservoir is pressurized and, subsequently, decompressed, are used for comparison between different flow models. It is shown that a simpler set of equations still produces acceptable results for practical pneumatic applications.
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