气动元件等温流动近似流量公式的探讨  

An Approach to Approximate Isothermal Flow-Rate Formula for Pneumatic Components: Also an Discussion on Choosing b

作　　者：史佚[1] 陈乾斌[1] 司冀[1] 

机构地区：[1]西安交通大学SMC气动技术中心,陕西西安710049

出　　处：《液压气动与密封》2010年第9期19-22,共4页Hydraulics Pneumatics & Seals

摘　　要：本文考虑了可压缩气体的特点,对伯努利方程作了修正,在此基础上推导出了可压缩气体等温流动下的近似流量公式。在近似情况下,所推导出的公式与常用的简易流量公式是一致的。本文在理论上证明了流量特性曲线在亚声速区近似一椭圆曲线。推导出了可压缩气体直接排入大气中的近似流量公式,它与雍塞流公式一致。本文还推导出了不可压缩气体近似流量公式,研究表明,在亚声速区,流量与压力比近于一个抛物线关系。Considering the characteristics of compressible gas,the Bernoulli Equation was modified.Based on this,the approximate isothermal flow-rate formula of compressible gas was deduced.The deductive formula is consistent with simple flow-rate formula in the approximate case.It is proved theoretically that the flow-rate characteristic curve in the subsonic zone is similar to an elliptic.The approximate flow-rate formula of the compressible gas directly exhaust in air was deduced,it is consist with the flow-rate formula in sonic zone.The approximate flow-rate formula of incompressible gas was also deduced.Study shows that the curve of flow-rate to pressure ratio approximates to a parabola.

关 键 词：等温流动 近似流量公式 临界压力比 

分 类 号：TH138.1[机械工程—机械制造及自动化] TH138.5