中文摘要：

研究吹填过程中珊瑚颗粒对于输送管道的侵蚀破坏具有重要的现实意义。文章分别使用标准k-着模型、双向耦合方式以及Grant&Tabakoff模型模拟输送管道内流场、跟踪大规模颗粒运动轨迹、计算珊瑚颗粒对于管道的侵蚀破坏。通过设计不同工况研究弯头走向、颗粒尺寸、输送速度以及流体密度对于侵蚀结果的影响，以期对实际工程提供技术指导。计算结果表明，垂直向下输送弯头中颗粒侵蚀结果大于垂直向上输送弯头中侵蚀结果，颗粒尺寸越大造成的侵蚀破坏越严重，输送速度对2种走向弯头中的侵蚀结果影响不一，增加流体密度可以有效减少颗粒侵蚀结果。

英文摘要：

It is of great practical significance to analyze the erosion progress caused by coral debris in blow-fill pipe for the island reclamation engineering.In this paper,the standard k-着model,two-way coupling method,and Grant&Takeoff erosion formula are respectively adopted to simulate the flow field in the blow-fill pipe,track the coral debris as the dispersed phase,and calculate the solid particle erosion for the pipe.The influences of bend direction,particle size,flow rate and liquid density on erosion results are inspected in detail to provide a reference for the actual project by designing various cases.The results show that the erosion of down flow bend is far higher than that of up flow bend,the coral particle with bigger size results in more serious erosion,the influences of flow rate on erosion result are different for the up and down flow bends,and increasing the liquid density can effectively decrease the erosion result in bend.