摘要
为了定量描述输油管道弯管处由于流体方向改变引起的流体速度改变和压力波动的动态行为,以及管道内部的冲蚀磨损规律,利用Fluent软件建立了90°弯管冲蚀模型。针对不同的入口流速工况,对弯头内部压力和速度场进行了数值模拟,分析了流体在弯管段的流动和冲蚀规律。分析结果表明,流体在经过弯管段时,对管壁外侧压力先增大后减小,并在该侧取得最大值;弯管处流体流速和管壁压力变化剧烈,该区域管壁冲刷腐蚀最为严重;弯头使流体流场更加复杂,增大了气泡溃灭的概率和弯管腐蚀速率;随着流体速度增大,管壁压力会增大,管壁冲刷腐蚀速率也随着流速增大而增大,实际应用中应选择合理的流速。
To quantitatively describe the dynamic behavior of the fluid velocity and pressure and pipeline inter-nal erosion damage process caused by the fluid direction change at the oil pipeline bend, an erosion model of 90° bend has been established by Fluent. The pressure and velocity field of the inside elbow under different inlet flow rates have been simulated to analyze the flow and erosion rule. The results show that when the fluid passes through the elbow section, the pressure on the outside wall increases first and then decreases. The maximum pressure was ob-served on the outside wall. The flow rate and pressure on the wall changed dramatically in the elbow, where most se-rious wall erosion-corrosion was observed. The elbow resulted in a more complicated fluid flow field, leading to an in-creased probability of bubble collapse and corrosion rate. With the fluid velocity increases, the pressure on the wall as well as the wall erosion corrosion rate increase. A reasonable flow rate should be chosen in practical applications.
出处
《石油机械》
2015年第12期104-108,共5页
China Petroleum Machinery
基金
四川省应用基础研究计划项目"高压输气管线钢变形与失效的多尺度行为研究"(13JC0277)
四川大学能源工程安全与灾害力学教育部重点实验室项目"金属基纳米陶瓷涂层界面结合性能的多尺度行为研究"
关键词
气液两相流
弯管
腐蚀速率
冲刷腐蚀
流速
数值模拟
gas-liquid two-phase flow
elbow
corrosion rate
erosion
flow rate
numerical simulation
