具有花瓣形结构的弯管抗冲蚀特性研究

Study on Erosion Resistance of Petal-shaped Elbow Pipe

冲蚀破坏是气固两相流弯管中的常见问题,其直接关系到管路系统的正常运行及管道寿命。针对此问题,提出一种内壁具有花瓣形的弯管结构,以提高弯管的抗冲蚀特性。采用CFD-DPM方法对该弯管结构气固流动特性进行了分析。分析结果表明:不同位置花瓣形结构具有与普通弯管相同的“V”形冲蚀分布;当位于颗粒壁面第一次碰撞之前,可以改变颗粒轨迹并在背部形成循环区,一定程度上抑制冲蚀;花瓣形结构最佳抗冲蚀位置为θ=20°且该位置不随流速和颗粒质量流量的变化而变化,相比于不具有花瓣结构的普通弯管,抗冲蚀性能提高17.27%。这种结构可提高弯管的抗冲蚀性能,延长管道寿命。

The erosion damage is a frequent failure for the elbow in gas-solid two-phase system,which is directly related to the reliability and working life of the pipeline system.A petal shaped elbow structure to improve the anti-erosion performance of the elbow is proposed.The gas-solid flow characteristics of the elbow structure were analyzed by using CFD-DPM method.The results show that the petal-shaped structure at different positions has the same V-shaped erosion distribution as the conventional elbow.Before the first impact on the particle wall,the particle track can be changed and a circulation zone can be formed on the back of the particle,which can inhibit the erosion to a certain extent.The best anti-erosion position of petal-shaped structure isθ=20°and this position does not change with the change of flow rate and particle mass flow rate.Comparing with the conventional elbow without petal-shaped structure,the anti-erosion performance is improved by 17.27%.This structure can improve the erosion resistance of the elbow and extend the life of the pipe.