桁架过流式三偏心蝶阀固液两相流冲蚀数值模拟

Numerical Simulation of Solid Liquid Two-phase Flow Erosion in Trussed Overflow Three-eccentric Butterfly Valves

利用计算流体力学欧拉-拉格朗日法,对桁架过流式三偏心蝶阀进行了固液两相流冲蚀数值模拟研究。结果显示,阀门附近流通截面积缩小使得其附近流场压降变化剧烈,进而导致液相介质与其携带的固相颗粒速度增大,对阀座迎水面壁面造成严重冲蚀。随着阀门开度增大,阀门前后压力降低,液相介质和固相颗粒速度减小,阀座迎水壁面上冲蚀速率降低的同时冲蚀面积增大。阀门上冲蚀速率随着液相入口流速或固相颗粒质量流量的增大而增大,相同固相颗粒质量流量下,冲蚀频率和颗粒质量是决定冲蚀速率的主要因素。

The Euler-Lagrange method of computational fluid dynamics was employed to simulate the erosion of a trussed overflow three-eccentric butterfly valve subjected to solid liquid two-phase flow.The results demonstrate that a reduction in the flow cross-sectional area in the vicinity of the valve results in a significant alteration in the pressure drop within the flow field in close proximity to the valve.This,in turn,gives rise to an increase in the velocity of the liquid medium and the solid particles carried by it,which consequently causes severe erosion to the water-facing wall of the valve seat.As the valve opening increases,the pressure before and after the valve decreases,the velocity of the liquid medium and solid particles decreases,and the erosion area increases while the erosion rate decreases on the water-facing wall of the valve seat.The erosion rate on the valve increases with the increase of the liquid inlet velocity or the solid particle mass flow rate.Under the same solid particle mass flow rate,the erosion rate is primarily determined by the erosion frequency and particle mass.