竖直管内气液两相流流量测量系统设计  

Development of Flowrate Measurement System of Gas-liquid Two-phase Flow in a Vertical Tube

作　　者：许兆峰[1] 李辉[1] 罗锐[1] 王东泽 王哲[1] 刘培[1] XU Zhaofeng;LI Hui;LUO Rui;WANG Dongze;WANG Zhe;LIU Pei(National Experimental Teaching Demonstration Center for Power Engineering and Engineering Thermophysics,State Key Laboratory of Power System,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学动力工程及工程热物理国家级实验教学示范中心,电力系统国家重点实验室,北京100084

出　　处：《实验室研究与探索》2020年第4期75-77,112,共4页Research and Exploration In Laboratory

基　　金：清华大学第三届实验室创新基金项目(014004)。

摘　　要：设计了一套竖直管内气液两相流流量的测量教学实验系统。该系统采用双参数测量法,即测量竖直管上方孔板流量计压差和测压管压差,将气液两相流视为物理性质均匀的单相混合物,则可推算出气液两相流总体积流量Q_M和空泡率α_A,并最终获得液相体积流量Q_L和气相体积流量Q_G。实验原理和实验数据表明,该方法适用于竖直管内泡状流的流量测量,低液体流速时,获得的气体体积流量精度高;高液体流速时,获得的液体体积流量精度高。Gas-liquid two-phase flow is a common phenomenon in industry.It has strong randomness and fluctuation which make difficult accurately measure its flow parameters such as flowrate and velocity.Therefore,a teaching experiment system for measuring the flowrate of gas-liquid two-phase flow in a vertical tube is developed by National Experimental Teaching Demonstration Center for Power Engineering and Engineering Thermophysics,Tsinghua University.We adopted the two-parameter measurement method to measure the pressure drop of the orifice flowmeter and the tube,calculated the total flowrate and void fraction of gas-liquid two-phase flow which was treated as single-phase flow with uniform physical properties,and finally derived the liquid flowrate and gas flowrate.The experimental principle and experimental data show that the measurement system is only applicable to bubble flow;gas flowrate measured is accurate if the liquid flowrate is low;while liquid flowrate measured is accurate if the liquid flowrate is high.

关 键 词：两相流 泡状流 流量测量 孔板流量计 空泡率 

分 类 号：TK31[动力工程及工程热物理—热能工程]