一、引言节流装置用于流体的计量,已在石油、化工、冶金、电力等工业部门,得到广泛地应用。尤其是在工业生产过程和控制系统中,对能源的控制,更少不了使用标准孔板。对其要求精确、可靠。但是,孔板设计结构上的弱点,使它无法较长的时间保持高的精确性和可靠性。因此,促使人们提出新 I. INTRODUCTION The throttling device is used for the measurement of fluid and has been widely used in the petroleum, chemical, metallurgy, electric power and other industrial sectors. Especially in industrial processes and control systems, the control of energy sources makes it even less difficult to use standard orifice plates. Its requirements are accurate and reliable. However, the structural weakness of the orifice design makes it impossible to maintain high accuracy and reliability over a longer period of time. Therefore, prompting people to propose new