Purpose

The purpose of this paper is to analyze the mechanism of particle erosion in butterfly valve pipelines under hydraulic transportation conditions. The results will affect the sealing and safety of butterfly valve pipelines and hopefully serve as reference for the anti-erosion design of butterfly valve pipelines.

Design/methodology/approach

Through the discrete element method (DEM) simulation that considers the force between particles, the detached eddy simulation (DES) turbulence model based on realizable k-epsilon is used to simulate the solid-liquid two-phase flow-induced erosion condition when the butterfly valve is fully opened. The simulation is verified by building an experimental system correctness. The solid-liquid two-phase flow characteristics, particle distribution and erosion characteristics of the butterfly valve pipeline under transportation conditions are studied.

Findings

The addition of particles may enhance the high-speed area behind the valve. It first increases and then decreases with increasing particle size. With increasing particle size, the low-velocity particles change from being uniformly distributed in flow channel to first gathering in the front of the valve and, then, to gathering in lower part of it. Fluid stagnation at the left arc-shaped flange leads to the appearance of two high-speed belts in the channel. With increasing fluid velocity, high-speed belts gradually cover the entire valve surface by focusing on the upper and lower ends, resulting in the overall aggravation of erosion.

Originality/value

Considering the complexity of solid-liquid two-phase flow, this is the first time that the DEM method with added inter-particle forces and the DES turbulence model based on realizable k-epsilon has been used to study the flow characteristics and erosion mechanism of butterfly valves under fully open transportation conditions.

中文翻译：

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基于DEM法的输送蝶阀固液两相流冲蚀数值与实验研究

目的

本文旨在分析水力输送条件下蝶阀管道中颗粒侵蚀的机理。研究结果将影响蝶阀管道的密封性和安全性，有望为蝶阀管道的抗冲蚀设计提供参考。

设计/方法/方法

通过考虑粒子间作用力的离散元法（DEM）模拟，采用基于可实现k-epsilon的分离涡流模拟（DES）湍流模型模拟蝶形时固液两相流冲蚀工况。阀门完全打开。通过搭建实验系统的正确性验证了仿真结果。研究了输送条件下蝶阀管道的固液两相流动特性、颗粒分布和冲刷特性。

发现

颗粒的加入可以增强阀门后面的高速区域。它随着粒径的增加先增加然后减少。随着粒径的增大，低速颗粒由均匀分布在流道中变为先聚集在阀前部，然后聚集在阀体下部。左弧形法兰处的流体停滞导致通道中出现两条高速皮带。随着流体速度的增加，高速带通过集中在上、下端逐渐覆盖整个阀门表面，导致冲刷的整体加剧。

原创性/价值

考虑到固液两相流的复杂性，首次采用加粒子间力的DEM方法和基于realizable k-epsilon的DES湍流模型来研究固液两相流的流动特性和侵蚀机理。蝶阀在全开运输条件下。