垂直安装文丘里管湿气测量模型研究 -学兔兔 www.xuetutu.com.pdf

第31卷第5期
仪器仪表学报
Vol 31 No 5
2010年5月
Chinese Fournal of Scientific Instrument
May 2010
垂直安装文丘里管湿气测量模型研究
周婉露,徐立军
(北京航空航天大学仪器科学与光电工程学院北京100191
摘要:文丘里管在湿气测量领域的应用越来越广泛,研究文丘里管中湿气的流动特性是准确地对湿气进行测量的前提。本
文从林宗虎模型出发,将其简化为关于干度的简单表达形式,建立了一种文丘里管湿气测量静态模型。在本研究的实验条件
(实验压力0.3~0.8MPa,气相的体积流量为80~120m3/h,液相的体积流量为0.3-4.5m3/h,干度为0.07~0.36)下,利用该
模型求得差压的均方根相对误差为5.27%。本文还研究了文丘里管差压信号的波动特性与干度之间的关系,建立了一种文丘
里管湿气测量的差压波动模型,利用该模型求得干度的均方根相对误差为6.86%。
关键词:湿气测量;文丘里管;湿气模型;差压波动特性;均方根相对误差
中图分类号:0359文献标识码:A国家标准学科分类代码:4701040
Modeling of wet gas flow in vertically mounted Venturi meter
Zhou Wanlu, Xu Lijun
(School of Instrumentation Science and Opto-electronic Engineering, Beihang Uniersity, Beijing 100791, China)
Abstract Venturi meters are playing an increasingly important role in wet gas metering in natural gas and oil
tries. Deep research on the properties of wet gas flowing in Venturi meters is necessary for accurate wet gas metering
By simplifying Lins model to a linear-wise expression of the quality, a static model for wet gas metering using of
Venturi meters is obtained and presented. The relationship between the dynamic properties of differential pressure
and the quality of wet gas flow is studied and a dynamic model for the fluctuation of the differential pressure for wet
gas metering is established. Experiments have been carried out within static pressure range of 0.3-0.8 Mpa, gas
volumetric flowrate range of 80 120 m /h, water volumetric flowrate range of 0.3-4.5 m/h and quality range of
0.070.36.It is concluded that the root mean square of the relative error of the differential pressure calculated
from the static model is 5. 27% and the root mean square of the relative error of the quality calculated from the dy-
namic model is 6.86%6
Key words: wet gas metering; Venturi meter; wet gas modeling; dynamic differential pressure; root mean square of
relative error(RMSRE)
个方向:一足采用传统的单相流流量计进行测量,通过结
1引言
合经验或半经验的修正模型来提高两相流的测量精度
常用的单相流流量计有孔板?、文丘里管?、涡街流量
湿气是一种特殊形态的气液两相流,其气相体积含计り等;二是采用近代测量新技术,如射线、激光、超声、
率超过95%,广泛存在于油气开采、能源、化工.等领过程层析成像等]。由于传统的节流式流量仪表已发展
域们。日前国内外对两相流检测技术的研究主要分为两很成熟,工作可靠性好,因此,采用孔板、文丘里管等流量
收稿H期:200907 Received Date:2009-07
基金项目:国家高技术研究发展计划(863)计划(2008A042207)、新世纪优秀人才支持计划资肋(NCET-07-0046)资助项目