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高压输气管道穿越河流时的力学行为受诸多因素影响,河床边界条件的变化是重要影响因素之一。该文基于流体动力学和固体力学理论,利用有限元软件FLUENT和ANSYS对高速水流冲击下的悬空管道进行了模拟分析。在总结出河床变化时悬空管道最大应力、位移变化规律的基础上,得到不同水流速度作用下高压输气管道的临界悬空长度。并对“西气东输”一线和“川气东送”等管线工程进行实例分析,所得计算结果对高压输气管道的日常维护和制定抗洪抢险方案具有一定的参考价值。
The mechanical behavior of high pressure gas transmission pipeline through the river is affected by many factors. The change of riverbed boundary conditions is one of the important influencing factors. Based on the theory of fluid dynamics and solid mechanics, the finite element software FLUENT and ANSYS are used to simulate the suspended pipeline under the impact of high-speed water flow. On the basis of summarizing the rules of the maximum stress and displacement of the suspended pipeline when the riverbed changes, the critical suspended length of the high pressure gas pipeline under different water flow velocities is obtained. The case analysis is also carried out on the first line of “West-East Gas Pipeline” and the “East-Gas Transmission of Sichuan-East Gas Transmission Project.” The calculated results are of certain reference value for the routine maintenance of high-pressure gas pipelines and the formulation of flood fighting and rescue programs.