海水输送止回阀液固两相流动及磨损特性研究
1. 维都利阀门有限公司, 浙江温州 325024
2. 浙江理工大学, 机械工程学院, 浙江杭州 310018
| 摘 要： | 止回阀作为安全阀在海水输送系统中起到关键调控作用，当海水介质中含有砂石颗粒时，液固介质的长期冲刷会造成止回阀磨损，导致阀门密封不严、泄漏，进而影响整个输送系统的安全运行。本文采用数值模拟的方法，分析不同止回阀行程开度、固体颗粒直径对止回阀内部颗粒运动及磨损特征的影响，获得阀门开度及颗粒粒径与颗粒运动和磨损特性之间的关联，为海水输送止回阀的磨损防控结构设计提供理论支撑。结果表明：相同颗粒直径工况下，流体流经阀芯时会形成高速射流，随着阀门开度的增加，高速射流的强度逐渐减弱，主要壁面的磨损程度减小，当阀门开度大于60%时，阀内高速射流强度及磨损程度变化不明显；相同阀门开度下，随着颗粒直径增加，阀芯和管道内颗粒沉降现象越明显，阀门关键面磨损程度逐渐增加，并且磨损位置向阀芯和管道下端偏移。 |
| 关 键 词： | 止回阀; 固液两相流; 流量系数; 颗粒磨损; 数值模拟 |
| DOI： | 10.57237/j.mse.2022.01.003 |
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收稿日期: 2022-10-23
接受日期: 2022-11-11
在线出版日期: 2022-12-01
Study on Liquid-Solid Flow and Erosion Characteristics in a Check Valve for Seawater Transportation
1. Weidouli Valves Co., Ltd., Wenzhou 325024, China
2. College of Mechanical Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China
| Abstract: | As a safety valve, check valve plays a key regulatory role in the seawater transportation system. When the seawater medium contains solid particles, the long-term impact of liquid-solid flows leads to erosion in check valve as well as lax sealing and leakage, which affects the safe operation of the transportation system. In this article, numerical simulations were carried out to study effects of valve opening degree and particle diameter on particle motion and erosion characteristic in a model check valve. Particle motion and erosion distributions were analyzed at different valve opening degrees and particle diameters to provide theoretical support for structure optimization of erosion protection in check valves for seawater transportation. Results show that under the same particle diameter, high-speed jet flows are generated at the downstream of the valve core. The intensity of the high-speed jet flows gradually decrease and the erosion on the main wall decreases with the increase of valve opening degree. When valve opening degrees is larger than 60%, the intensity of high-speed jet flows and erosion distributions are changed slightly. At the same valve opening degree, with the increase of particle diameter, the settlement of particles near valve core and pipe becomes more obvious and erosion increases with the erosion position moving toward the downside of valve core and pipe at the downstream. |
| Keywords: | Check Valve; Solid-liquid Two-Phase Flow; Flow Coefficient; Particle Erosion; Numerical Simulation |
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