【摘要】 为探索超声波流量计测量湿气时的特性，以双声道平行直射式气体超声波流量计为研究对象，分析了超声波流量计虚高产生的原因和影响因素。基于水平直管气液两相流的经典L-M(Lockhart-Martinelli)截面含气率模型，建立了双声道平行直射式超声波流量计湿气虚高预测模型。在天津大学中压湿气流量实验装置上进行了超声波流量计湿气实验，在压力范围0.2～0.8 MPa、气相表观流速5～20 m/s的湿气工况条件下，超声波流量计正常工作时，虚高预测模型的整体相对误差在±6%以内，90.3%的相对误差在±4%以内；同时，93.6%实验工况点下的测量重复性小于1%,整体测量重复性的平均值为0.41%。更多还原

【Abstract】 In order to explore the characteristics of ultrasonic flowmeter in measuring wet gas, a dual channel parallel direct gas ultrasonic flowmeter was taken as the research object, in order to analyze the causes and influencing factors of the over-reading of ultrasonic flowmeter.Based on the classical L-M(Lockhart-Martinelli)void fraction model of horizontal straight pipe gas-liquid two-phase flow, a prediction model of wet gas over-reading of a dual channel parallel direct ultrasonic flowmeter was established.The wet gas experiment of ultrasonic flowmeter was carried out on the medium pressure wet gas flow experimental facility of Tianjin University.Under the condition of pressure range of 0.2～0.8 MPa and gas phase superficial flow rate of 5～20 m/s, the overall relative error of the over-reading prediction model is within ±6%,and 90.3% relative error is within ±4% when the ultrasonic flowmeter works normally.At the same time, the repeatability of measurement under 93.6% experimental conditions is less than 1%,and the average value of overall repeatability is 0.41%.更多还原