气-液两相流装置的控制和不确定度评定

Research on control and uncertaintyevaluation of gas-liquid two-phase flowequipment

气-液两相流具有复杂的流动状态从而导致其无法被准确地控制,针对一套气-液两相流装置,对装置的压力-流量控制进行了研究,并对气-液两相的联合控制进行了实验,结果表明压力对控制具有较大影响。在控制过程中需要保证压力的不变,而气-液两相的联合控制具有变化的一致性,可通过研究一致性实现气-液两相的准确控制。同时对该装置的气-液两相流分量分别进行不确定度评定,结果表明,装置气体流量的U_(r)(Q_(v,air))=3.8%(k=2);装置液体流量的扩展不确定度U_(r)(Q_(v,liq))=3.2%(k=2),可对气-液两相的流量进行准确显示。

Gas-liquid two-phase flow exhibits complex flow patterns,making it challenging to achieve precise control.This study focuses on the pressure-flow control of a gas-liquid two-phase flow system and investigates the joint control of both phases through experimental research.The results reveal that pressure has a significant impact,necessitating the maintenance of constant pressure during the control process.Moreover,the joint control of gas-liquid two-phase flow demonstrates variable consistency,enabling accurate control by studying this consistency.Additionally,uncertainty evaluations were conducted separately for the gas and liquid flow rates in the system.The uncertainty of gas flow rate U_(r)(Q_(v,air))was determined as 3.8%(k=2),while the extended uncertainty of liquid flow U_(r)(Q_(v,liq))was found to be 3.2%(k=2).These findings ensure precise display of gas-liquid two-phase flow rates.