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首页基于对称文丘里管的湿气流量测量及其优化
基于对称文丘里管的湿气流量测量及其优化
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更新于2024-09-01
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本研究聚焦于湿气流量测量,利用对称文丘里管(Symmetrical Venturi Tube)作为关键设备。文丘里管是基于流体力学的基本方程设计的,其对称结构的优势在于能够有效降低由于摩擦产生的压力降(Frictional Pressure Drop),这对于在低压力多相流系统中的精确测量至关重要。实验测试在操作压力范围0.02-0.20兆帕(MPa)下进行,考察了不同参数条件下的性能:气体相质量分数(Mass Fraction)从0.5至1,气体相体积分数(Volume Fraction)从0.95至1,以及气体的密度计量弗劳德数(Gas Densiometric Froude Number)从1.0到2.5。研究者采用了一个具有0.619值的新型流量计,同时分析了改良的LM参数(Modified LM parameter)对其读数误差的影响。 实验重点分析了在特定工况下,改良LM参数、压力以及气体密度计量弗劳德数对测量结果的过读效应。通过独立数据的分析,研究人员揭示了这些参数如何影响测量精度,并对现有的八个模型进行了比较。实验数据与理论分析相结合,利用信息融合技术,提供了更深入的理解和评估。这种对称文丘里管设计在处理湿气流量测量时展现出其优越性能,对于提高测量的稳定性和准确性具有重要意义,对于工业过程控制和气体计量领域具有实际应用价值。
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Wet Gas Flow Measurement base on a Symmetrical Venturi
Tube
Lide Fang
*
, Lili Pang, Xiaoting Li, Xiuming Xiang, and Qinghua Lu
The college of Quality and Technology Supervision, Hebei University, 071002, Baoding, China
In this study, a symmetrical Venturi tube was used in wet gas measurement, according to the basic equations of
hydrodynamics, and the effect of the frictional pressure drop on flow measurement could be reduced by the
symmetrical structure; some new tests were done in low pressure multiphase flow loop. The meters with value of
0.619 were tested in the working operation pressure of 0.02-0.20MPa, the mass fraction of gas phase from 0.5 to 1, the
volume fraction of gas phase from 0.95 to 1, the gas densiometric Froude number from 1.0 to 2.5, and the modified LM
parameter from 0.008 to 0.5. Finally, the effects of modified LM parameter, pressure, and gas densiometric Froude
number on the over reading were analyzed with new independent data.
In addition, the existing eight models were
compared based on experimental data in these conditions, the theoretical analysis and results of comparative test were
combined with information fusion technology to establish a new measurement model and fit the model parameters, and
it was validated by experiments.
Keywords: Symmetrical Venturi Tube, Wet Gas, Acceleration Pressure Drop, Frictional Pressure Drop, Gravity
Pressure Drop.
1. INTRODUCTION
In the study of the gas-liquid two-phase flow measurement
characteristics of the Venturi tube and U-tube, two kinds of
differential pressures are mainly measured, which are gravity
pressure drop of the Venturi pipe of the U-shaped tube to get the
phase holdup and the Venturi pressure drop resulted from
acceleration to obtain the total flow; these two types of pressures
measurements are affected by the friction pressure drop.
1-3
The
sum pressure between the ascent stage and descent stage of
U-shaped tube can reduce the impact of friction pressure in the
measurement of the vertical pipe pressure drop. However,
because keeping both sides of the flow consistent is difficult,
vertical tube increases the flow instability, and especially the
flow of both sides are impacted greatly by the 180 bends of
U-shaped tube. This makes the way of getting the gravity
pressure drop using U-shaped tube restricted to the application
in which the gas phase is the continuous phase, and the liquid
phase is the discrete phase.
When the total flow of two-phase is measured by Venturi
tube assembled horizontally, the differential pressure coming
from the contracted section contains two parts, the acceleration
pressure which is an useful signal for the differential pressure
flowmeter and the friction pressure which follows the Bernoulli
equation as well as the speed of the fluid. In the deduction of the
measurement principle of the differential pressure instrument,
the frictional pressure drop is usually ignored. The fluid flow
measurement equation is obtained from the Bernoulli equation
of the ideal fluid, and fluid compressibility, viscous (friction),
1
which are corrected according to experiments.
4-7
For
single-phase flow, friction is associated with the wall roughness,
*
Author to whom correspondence should be addressed
fanglide@sina.com.
flow rate, and some other factors; This correction is better
because of their low friction, The two-phase flow is not the case.
Two-phase friction pressure drop has some connections with
two-phase flow, two-phase phase holdup, two-phase thermal
parameters, flow, two phase interaction and some other factors,
and its variations are very complex. With the enhancement of the
two-phase interaction, friction pressure drop increases
dramatically, even faster than acceleration pressure drop. At this
moment, reading from the differential pressure transmitter can
no longer reflect the acceleration pressure drop of Venturi
contracted section. Therefore, it can not get the correct result.
8-13
In order to conduct the measurement of the gravity pressure
drop and the acceleration pressure drop without the effect of the
frictional pressure drop, this paper researches the causes of the
friction pressure drop, the derivation of Venturi flowmeter
measurement model, and the features of U-tube effect in
reducing the friction pressure drop, and proposes a new
two-phase flow measuring device: symmetrical Venturi tube.
This device whose contraction and expansion sections of Venturi
are designed to a symmetrical structure which has combined
advantages of Venturi flowmeter with U-tube, so the friction
pressure is removed through algebraic operation according to the
characters of contraction and expansion differential pressure.
Measuring differential pressure located in the center of the
device in the vertical direction which is perpendicular to the
horizontal pressure can get the gravity pressure drop without
impact resulted from friction pressure drop.
14-15
2. THEORETICAL BASIS
In the horizontal pipe, if the pressure is measured in the
horizontal direction, the gravity pressure drop can be ignored,
and the acceleration pressure drop and friction pressure drop are
remained. Usually taking differential pressure at both ends of the
contraction section in Venturi tube can obtain the sum of the
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