Study on Flow-Rate Characteristics and Test Methods of Pneumatic Components

doi:10.7652/xjtuxb201508011

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Study on Flow-Rate Characteristics and Test Methods of Pneumatic Components

更新时间：2025-07-09

- Study on Flow-Rate Characteristics and Test Methods of Pneumatic Components
- Vol. 49, Issue 8, Pages: 64-68(2015)
- 作者机构：
  
  西安交通大学机械工程学院气动技术中心,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201508011
  CLC： TH138
- Online First：10 August 2015，
  
  Published：2015
- 稿件说明：
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Study on Flow-Rate Characteristics and Test Methods of Pneumatic Components[J]. 2015, 49(8): 64-68.
DOI：

Study on Flow-Rate Characteristics and Test Methods of Pneumatic Components[J]. 2015, 49(8): 64-68. DOI： 10.7652/xjtuxb201508011.

摘要

针对气动元件流量特性曲线的形状、形成机理以及ISO6358标准中测试方法存在的问题

运用理论与实验相结合的方法

研究了临界压力比两种取值方法间的关系

发现了特性曲线中流量不变段与下降段的分界点并不是元件内声速流与亚声速流的转折点

提出在气动元件流量特性的测试中

须对被测元件的上、下游压强进行补偿。实验结果表明:特性曲线中的下降段部分近似为椭圆曲线

临界压力比两种取值结果间的差值约为0.15

特性曲线中的下降段并不只代表亚声速流态

还包含了由超声速变化到声速的过程

忽视压强补偿导致测试结果的误差达15%以上。

Abstract

A theoretical-experimental method is used to study the shape

forming mechanism of flow-rate characteristic curves and some existing problems of test methods specified in ISO6358. It is found out that the cut-off point of the flow-rate in characteristic curve is obviously different from the transitional point of airflow velocity in pneumatic components by studying the relationship between two different methods to calculate critical back-pressure ratios. Moreover

it is proposed that it is necessary to compensate the measured upstream and downstream pressures of components under test. The experimental results show that the difference between critical back-pressure ratios obtained from the two methods is about 0.15

and the fallen section of the flow-rate characteristic curve includes not only the state of subsonic but also a change process from supersonic to sonic. Furthermore

the subsonic index m≈0.5

that is

the fallen section of the curve is an approximate elliptic curve. It is also found out that a 15% error appears when the influence of pressure compensation is ignored.

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references

李林, 彭光正, 王雪松. 气管道流量特性参数的分析研究 [J]. 液压与气动, 2004(4): 5-7.

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SMC(中国)有限公司. 现代实用气动技术 [M]. 北京: 机械工业出版社, 2008: 34-67.

曹玉平, 阎祥安. 气压传动与控制 [M]. 天津: 天津大学出版社, 2010: 16-35.

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SHI Yi, CHEN Qianbin, SI Ji. An approach to approximate isothermal flow-rate formula for pneumatic components: also a discussion on choosing b [J]. Hydraulics Pneumatic and Seals, 2010(9): 19-22.

司冀, 王永盛, 史维祥. 关于气动阀临界压力比b及其流量公式的探讨 [J]. 液压气动与密封, 2011(2): 47-51.

SI Ji, WANG Yongsheng, SHI Weixiang. An approach to critical pressure ratio b and its flow-rate formulas for pneumatic valve [J]. Hydraulics Pneumatic and Seals, 2011(2): 47-51.

International Organization for Standardization. ISO 6358-2 Pneumatic fluid power-determination of flow-rate characteristics of components using compressible fluids [S]∥Geneva, Switzerland: International Organization for Standardization, 2014: 24-37.

徐炳辉. 气动手册 [M]. 上海: 上海科学技术出版社, 2005: 46-49.

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