模拟分析小颗粒对T型管的冲蚀

Simulation Analysis on the Impact Erosion of Small Particles on the T-type Tube

T型管道在天然气输送中较为常见的管件,气体在管道内流动时流向会发生改变导致气体直接冲击管壁,此时气体内夹带的微小颗粒也会冲击管壁,形成冲蚀降低管道输送的安全性。为了充分了解颗粒对管壁冲蚀影响,以两端为入口,一端为出口的T型管为研究对象,利用FLUENT模拟不同流速下产生的冲蚀情况。在T型管的一个入口端注入小颗粒并且保持入口条件不变,另外一个入口端不加颗粒而改变气体的速度来观察产生冲蚀的情况。结果显示改变无颗粒进气端的速度会对冲蚀的位置产生影响,同时冲蚀的程度也会产生一些变化。对比分析在不同气体流速下管道内压力云图、速度云图和流线图,来揭示颗粒的运动规律进而说明气体流速对于颗粒对于管壁冲蚀的影响。为实际生产中确定管道危险位置提供依据。

T-type tube is widely used in the natural gas transportation system. The gas flow direction changes in the T-type pipe, which can cause gas direct impact on the wall. At this point the gas entrained small particles will also impact the pipe wall to form the erosion, which can reduce the safety of pipeline transportation system. In order to understand the impact of particles on the pipe wall, taking a T-type tube as the research object, simulation of erosion under different flow velocities by using FLUENT was carried out. Small particles were injected into the inlet end of the T-type tube and the inlet condition kept constant, and the gas without particles was injected into the other inlet end of the T-type tube under different speed, the erosion condition was observed. The results show that changing the inlet velocity can affect the position and the degree of erosion. The pressure, velocity and flow charts in the pipeline under different gas velocity were compared and analyzed to reveal the movement of particles and to explain the effect of gas flow velocity on the erosion of the pipe wall.