多级降压调节阀内部流动特性数值模拟

方毅芳; 项高翔; 唐春娥; 石月娟

doi:10.13700/j.bh.1001-5965.2021.0070

多级降压调节阀内部流动特性数值模拟

doi: 10.13700/j.bh.1001-5965.2021.0070

1.
机械工业仪器仪表综合技术经济研究所, 北京 100055
2.
西北工业大学力学与土木建筑学院, 西安 710129
3.
吴忠仪表有限责任公司, 吴忠 751100

基金项目:

国家重点研发计划 2018YFB2004000

详细信息

通讯作者:
方毅芳, FANG Yifang, E-mail: yifang@instrnet.com

中图分类号: V221⁺.3;TH214
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- PDF下载量: 29
- 被引次数: 0
出版历程
- 收稿日期: 2021-02-02
- 录用日期: 2021-05-11
- 网络出版日期: 2021-06-15
- 整期出版日期: 2022-10-20

Numerical simulation on internal flow performances of multi-stage pressure drop valve

1.
Instrumentation Technology and Economy Institute, Beijing 100055, China
2.
School of Mechanics, Civil Engineering & Architecture, Northwestern Polytechnical University, Xi'an 710129, China
3.
Wuzhong Instrument Co., Ltd., Wuzhong 751100, China

Funds:

National Key R & D Program of China 2018YFB2004000

More Information

Corresponding author: FANG Yifang, E-mail: yifang@instrnet.com

摘要

摘要:
为研究多级降压调节阀内部流动过程和各降压级的压降影响因素及规律，基于Mixture两相流模型和Schnerr-Sauer空化模型的数值计算方法，建立了多级降压调节阀内部流场的计算模型。通过数值模拟计算，获得了调节阀内部的流动特性，分析和探讨不同压差和不同阀门开度下各降压级压降特性。数值计算结果表明：流体流经阀门节流元件时，由于多股流体的强烈掺混和剪切使得阀门内存在大量的漩涡；各降压级的压降存在一定的差异，第3级套筒处的空化程度最大，阀座处更易发生空化；阀门在同一开度下，工质沿各降压级的压降在不同压差下的变化趋势相同；第3降压级的压降随阀门开度的减小而增大，在25%开度下阀门第3降压级的平均压降最大，达到了8 MPa，相同流量下该降压级小孔中工质的速度也增加。研究结果为降压阀的合理设计提供了理论依据和参考价值。
- 调节阀 /
- 多级套筒 /
- 高压降 /
- 计算流体动力学(CFD) /
- 空化
Abstract:
To study the internal flow process of the multi-stage pressure drop valve and the influencing factors and influence laws of the pressure drop of pressure-drop-stage, based on the numerical calculation method of the Mixture two-phase flow model and the Schnerr-Sauer cavitation model, the calculation model of the flow field of a multi-stage inside the valve was established. The flow characteristics inside the pressure drop valve are obtained through numerical simulation calculation, and the impact of various pressure differences and various opening degrees of the valve on the pressure drop of each pressure-drop-stage is analyzed and discussed. Numerical calculation results show that there are a large number of vortices in the valve due to the vigorous mixing and shear of multiple fluids when the fluid flows through the throttle element of the valve. The pressure drop of each pressure-drop-stage is different, and the degree of cavitation of the third stage sleeve is the largest, cavitation is more likely to occur at the valve seat. The pressure drop of the working fluid along each pressure-drop-stage exhibits the same changing trend at the same opening degree of the valve under various pressure differences. The pressure drop of the third pressure-drop-stage rises when the opening degree of the valve is reduced. The average pressure drop of the 3rd pressure-drop-stage reaches 8 MPa at the opening degree of 25%. The velocity of working fluid in the small hole of the pressure-drop-stage also increases under the condition of the same mass flow rate. This paper provides the theoretical basis and reference value for the designs of the pressure reducing valve.
- valve /
- multi-stage sleeve /
- high pressure-drop /
- computational fluid dynamics (CFD) /
- cavitation

HTML全文

图 1 多级降压调节阀剖视图

Figure 1. Sectional view of multi-stage pressure drop valve

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图 2 多级降压调节阀流体域模型

Figure 2. Fluid domain model of multi-stage pressure drop valve

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图 3 多级降压调节阀的整体网格划分

Figure 3. Integral meshing of multi-stage pressure drop valve

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图 4 多级降压调节阀的局部网格划分

Figure 4. Local meshing of part of multi-stage pressure drop valve

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图 5 阀门中心线上压力分布

Figure 5. Pressure distribution at the median of valve

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图 6 阀门中间截面的压力分布(实验组1)

Figure 6. Pressure distribution at the middle section of valve(case1)

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图 7 阀门中间截面的速度分布(实验组1)

Figure 7. Velocity distribution at the middle section of valve(case1)

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图 8 阀门内部的涡量分布(Q=1)

Figure 8. Vortex distribution inside valve(Q=1)

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图 9 阀门中间截面的气相分布(实验组1)

Figure 9. Vapor distribution at the middle section of valve(case1)

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图 10 阀门进口质量流量随开度的变化(实验组1)

Figure 10. Mass flow rate at valve inlet versus valve opening degree(case1)

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图 11 不同开度下的压降变化

Figure 11. Variation of pressure drop under different opening degree

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图 12 实验组1的静压分布云图(开度25%)

Figure 12. Static pressure distribution of case 1 (opening degree 25%)

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图 13 不同开度下实验组1的静压分布云图

Figure 13. Static pressure distribution of case1 under different opening degree

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图 14 不同开度下降压级的压降变化(实验组1)

Figure 14. Pressure drop variation of pressure-descending stages under different opening degree (case1)

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图 15 实验组1的速度分布云图

Figure 15. Velocity distribution of case1

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图 16 不同开度下降压级的压降变化(实验组4)

Figure 16. Pressure drop variation of pressure-descending Stages under different opening degree (case4)

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图 17 第1~3级套筒沿流向中心线速度分布曲线

Figure 17. Velocity distribution curves of the 1st~3rd stage sleeve along the centerline flow direction

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图 18 第1~3级套筒沿流向中心线静压分布曲线

Figure 18. Static pressure distribution curves of the 1st~3rd stage sleeve along the centerline flow direction

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表 1 不同工况条件实验组阀门的进出口压力及压差

Table 1. Inlet and outlet pressures and pressure differe under different conditions

工况	进口压力/ MPa	出口压力/ MPa	进出口压差/ MPa
实验组1	8.82	0.21	8.61
实验组2	9.4	0.15	9.25
实验组3	9.4	0.1	9.3
实验组4	9.4	0.05	9.35

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表 2 关键数值计算方法

Table 2. Key numerical calculation methods

类别	数值方法
压力-速度耦合形式	PISO
湍流模型	IDDES
多相流模型	Mixture
空化模型	Schnerr & Sauer

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表 3 网格类别

Table 3. Mesh specifications

网格类型	网格数量	质量流量/(kg·s^-1)
M1(粗糙)	7.326×10⁶	15.982 3
M2(中等)	12.03×10⁶	16.233 3
M3(精细)	17.58×10⁶	16.517 8

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