文丘里管扩张段湿气流动特性与结构优化

徐英; 王雅丹; 张涛; 汪晶晗

doi:10.13433/j.cnki.1003-8728.20180033

文丘里管扩张段湿气流动特性与结构优化

doi: 10.13433/j.cnki.1003-8728.20180033

1.
天津大学电气自动化与信息工程学院, 天津 300072

详细信息

作者简介:
徐英(1970-),教授,博士,研究方向为湿气流量计量、智能仪表研发,xuying@tju.edu.cn

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出版历程
- 收稿日期: 2017-04-26
- 刊出日期: 2018-08-05

Wet-gas Flow Characteristics and Structural Optimization of Venturi Divergent Section

1.
School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China

摘要

摘要: 对文丘里管扩张段加速压降和摩阻压降进行理论分析，利用计算流体力学（Computational fluid dynamics，CFD）数值模拟方法针，对管径50 mm，节流比0.55的长喉颈文丘里，从扩张角度和扩张段形状入手设计了4种结构，寻找适合湿气流动且能提高文丘里前后差压比值K对液相体积含率LVF线性辨识能力的最优结构。模拟结果与理论分析吻合，表明差压比值K随扩张角度增加而增大，但难以实现线性辨识。扩张段采用椭圆弧结构，可通过减小加速压降增大摩阻压降提高K值对液相的分辨能力。同时必须保证扩张段与后直管段平缓连接，从而确保湿气流动形态稳定。椭圆弧结构与直线结构平缓相接的扩张段模型在保证湿气流动稳定前提下，将差压比K与LVF的线性度由原先的1.5%拓宽到4.5%。
- 文丘里 /
- 扩张段 /
- 湿气 /
- 加速压降 /
- 摩阻压降 /
- 差压比值 /
- 液相体积含率
Abstract: In this paper, a theoretical analysis of the accelerated pressure drop and the frictional pressure drop of the Venturi divergent section was carried out. Based on the long throat Venturi with a diameter of 50 mm and beta ratio of 0.55, 4 kinds of structures were designed from the divergent angle and the shape of divergent section by numerical simulation method of computational fluid dynamics (CFD). Finding the optimal structure used in wet-gas flow can improve the linear identification of up and down differential pressure ratio K with liquid volume fraction (LVF). Simulation data coincide with theoretical analysis results. The results showed that the value of K rises with the increase of the divergent angle, but it is difficult to realize the linear identification. The elliptical arc divergent section can improve resolving power of K to liquid phase by decreasing the accelerated pressure drop and increasing the friction pressure drop. It is necessary to ensure the smooth connection between the divergent section and straight pipe section, so as to ensure the stability of the flow pattern. The divergent section of the elliptic arc structure connects with linear structure smoothly ensuring the stability of wet-gas flow, meanwhile the linearity between K and LVF is broadened from the original 1.5% to 4.5%.
- Venturi /
- divergent section /
- wet-gas /
- accelerate pressure drop /
- frictional pressure drop /
- differential pressure ratio /
- liquid volume fraction

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参考文献(19)

[1]	International Organization for Standards. Measurement of wet gas flow by means of pressure differential devices inserted in circular cross-section conduits, ISO/TR11583[R]. London:ISO, 2012
[2]	Spialter M L. Characteristics of two phase flow through a vertical venturi[D]. New York:New York University, 1952
[3]	Murdock J W. Two-phase flow measurement with orifices[J]. Journal of Basic Engineering, 1962,84(4):419-432
[4]	Chisholm D. Void fraction during two-phase flow[J]. Journal of Mechanical Engineering Science, 1973,15(3):235-236
[5]	De Leeuw R. Liquid correction of venturi meter readings in wet gas flow[R]. Kristiansand:North Sea Flow Measurement Workshop, 1997
[6]	Steven R N. Wet gas metering with a horizontally mounted venturi meter[J]. Flow Measurement and Instrumentation, 2002,12(5-6):361-372
[7]	Reader-Harris M, Nel T, Graham E. An improved model for venturi-tube overreading in wet gas[R]. Norway:Proceedings of the 27th International North Sea Flow Measurement Workshop, 2009
[8]	张强,徐英,张涛.基于长喉径文丘里管的双差压湿气流量测量[J].天津大学学报,2012,45(2):147-153 Zhang Q, Xu Y, Zhang T. Wet gas metering based on dual differential pressure of long throat Venturi tube[J]. Journal of Tianjin University, 2012,45(2):147-153(in Chinese)
[9]	徐英,张涛,袁超,等.双比值法湿气液相含率测量装置:中国,CN106052775A[P].2016-10-26 Xu Y, Zhang T, Yuan C,et al. Moisture liquid phase containing rate measurement device using dual-ratio method:China, CN106052775A[P]. 2016-10-26(in Chinese)
[10]	Agar J, Farchy D. Wet gas metering using dissimilar flow sensors:theory and field trial results[R]. San Antonio, Texas:Society of Petroleum Engineers, 2002:1-6
[11]	Solartron ISA. Dualstream Ⅱ:Development of a new intelligent wet gas meter, ISA102[R]. Durham:Solartron, 2001
[12]	徐英,谭晋飞,巴玺丽,等.长喉颈文丘里喉部取压位置对湿气测量模型影响的试验研究[J].机械工程学报,2014,50(12):157-164 Xu Y, Tan J F, Ba X L, et al. Experimental study on the influence of longer throat Venturi tube pressure tappings position to wet gas measurement model[J]. Journal of Mechanical Engineering, 2014,50(12):157-164(in Chinese)
[13]	Kumar P, San S M. CFD study of the effect of venturi convergent and divergent angles on low pressure wet gas metering[J]. Journal of Applied Sciences, 2014,14(22):3036-3045
[14]	阎昌琪.气液两相流[M].2版.哈尔滨:哈尔滨工程大学出版社,2010 Yan C Q. Gas-liquid two-phase flow[M]. 2nd ed. Harbin:Harbin Engineering University Press, 2010(in Chinese)
[15]	Yu P N, Xu Y, Zhang T, et al. A study on the modeling of static pressure distribution of wet gas in Venturi[J]. AIChE Journal, 2015,61(2):699-708
[16]	张也影.流体力学[M].2版.北京:高等教育出版社,1999 Zhang Y Y. Fluid dynamics[M]. 2nd ed. Beijing:Higher Education Press, 1999(in Chinese)
[17]	Lockhart R W, Martinelli R C. Proposed correlation of data for isothermal two-phase,two-component flow in pipes[J]. Chemical Engineering Progress, 1949,45(1):39-48
[18]	徐英,蒋荣,张涛,等.基于文丘里流量传感器的湿气两相流量模型研究[J].传感器与微系统,2016,35(5):4-8 Xu Y, Jiang R, Zhang T, et al. Research on two-phase flow model for wet gas based on Venturi flow sensor[J]. Transducer and Microsystem Technologies, 2016,35(5):4-8(in Chinese)
[19]	Xu Y, Gao L, Zhao Y, et al. Wet gas overreading characteristics of a long-throat Venturi at high pressure based on CFD[J]. Flow Measurement and Instrumentation, 2014,40:247-255