双入口条件互异对三通冲蚀影响数值模拟研究

Numerical Simulation Study on Erosion Effects of Differential Dual Inlet Conditions in Tee Pipes

摘要: 为研究分析天然气输送过程中三通管“两进一出”工况下入口条件互异对三通管的冲蚀影响，基于混合物多相流模型和离散相模型，研究了三通管中气–液–固三相的流动，结合E/CRC冲蚀模型，分析了入口速度、入口液相体积分数和管径互异对三通管冲蚀的影响。结果表明：主管和支管入口流速差异影响了流场主导模式，从而改变了冲蚀形态和冲蚀速率的变化趋势；主管和支管入口液相体积分数差异改变了下壁面高速区域的流速，导致随着支管入口液相体积分数增加，冲蚀形态由椭圆向钟形扩展，并使冲蚀速率随之增加；主管和支管管径差异改变了三通管下壁面高速区域的流速和颗粒分散程度，导致随着支管管径逐渐增大，呈现出“冲蚀面积增大–冲蚀速率降低”的逆向关系。可见主管和支管入口条件互异会改变三通管流场分布，从而影响三通管冲蚀部位、冲蚀形状和冲蚀速率。

Abstract: To investigate the erosion effects caused by differential inlet conditions in tee pipes under the “two-inlet-one-outlet” configuration during natural gas transportation, this study analyzed gas-liquid-solid three-phase flow in tee pipes using the mixture multiphase flow model and discrete phase model (DPM), combined with the E/CRC erosion model. The impacts of inlet velocity differences, liquid-phase volume fraction variations, and diameter discrepancies between the main and branch pipes on erosion were systematically examined. The results demonstrate that: Velocity differences between the main and branch pipes alter flow field dominance patterns, consequently modifying erosion morphology and rate trends. Liquid-phase volume fraction variations between inlets change flow velocity in high-speed regions along the lower wall surface. As the branch pipe’s liquid-phase volume fraction increases, the erosion morphology expands from elliptical to bell-shaped, accompanied by increased erosion rates. Diameter discrepancies between pipes affect both flow velocity in high-speed regions and particle dispersion on the lower wall. With increasing branch pipe diameter, an inverse relationship emerges: expanded erosion areas coincide with reduced erosion rates. These findings reveal that differential inlet conditions between main and branch pipes significantly modify flow field distribution in tee pipes, ultimately influencing erosion location, morphology, and rate characteristics.