In order to quantitatively describe the changes of flow field characteristics and the internal erosion corrosion damage process due to the change of fluid direction in bends of pipelines,an erosion physical model of 90° elbow pipe was established under the Workbench platform,from which the distribution rules of pipe wall pressure,shear stress and fluid velocity in the elbow were obtained.The results show that the flow field in the elbow was complex,resulting in severe erosion corrosion in this place.The erosion corrosion of the outside of the elbow was most serious,followed by the straight section near outlet.There was almost no erosion corrosion on the inlet straight pipe and the inner side of the elbow.Larger diameter sands carried more kinetic energy and impact force,resulting in severer erosion corrosion on the tube wall.%为了定量描述输油管线弯管处由于流体方向改变引起的流场特性变化和管道内部冲蚀损伤过程,在Workbench平台下利用Fluent建立了90°弯管冲蚀物理模型,获得了弯管管壁压力、剪切应力以及流体流速的分布规律.结果表明:弯管处流场变化复杂,是此处管道严重冲刷腐蚀的原因;弯管外侧冲刷腐蚀最为严重,出口直管段的冲刷腐蚀次之,入口直管段及弯管内侧几乎无冲刷腐蚀;较大直径的砂粒会携带更大的动能和冲击力,从而在管壁上形成更加严重的冲刷腐蚀.
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