淹没状态下高压水射流破岩效率分析

为研究淹没状态下射流参数对射流破岩效率和安全性的影响,基于流体力学、弹塑性力学及岩石力学,通过流固耦合罚函数算法建立淹没状态下水射流冲击岩石数值计算模型。通过理论分析和实际试验对比验证所建模型。对不同工况下淹没射流冲击岩石进行数值模拟,探讨不同射流参数对破岩效率的影响。结果表明:随着射流速度的增大,破岩效率先后经历线性增长阶段和平稳增长阶段,岩石冲蚀深度变化具有一定相似性;岩石的冲蚀深度随靶距的增大而迅速减小,冲蚀孔径随靶距的增加而增大,冲蚀体积呈先增大后减小的变化趋势;射流直径对破岩效率的影响主要表现在冲蚀孔径上,对冲蚀深度几乎没有影响。基于正交设计试验,得到不同射流参数敏感性大小依次为:射流速度,靶距,射流直径。

Study on Breaking Rock Efficiency of Submerged Water Jet

To study the influence of water jet parameters on breaking rock efficiency and safety in submerged condition,based on fluid mechanics,elastic-plastic mechanics and rock mechanics,a model of submerged water jet breaking coal rock was built using Arbitrary Lagrangian Eulerian(ALE) fluid-solid coupling penalty function method,and the model was validated through theoretical analysis and practical experiment.The influence of different water jet parameters on the efficiency of breaking rock was explored,by simulating submerged water jet impacting rock in different conditions.The results show that in submerged state,with the water jet velocity increasing,the submerged water jet breaking rock efficiency changing includes linear growth stage and steady growth stage,and broken depth changing has a certain similarity with different velocities,that the stand-off distance increases,the broken depth decreases rapidly,but the broken radius has a increase,and the removal volume increases firstly and then falls with the stand-off distance increasing,that the water jet diameter increases,the broken radius increases significantly,yet the broken depth is almost unchanged,and that ranked in order of the significance to the broken crater depth,the parameters are water jet velocity,stand-off distance and water jet diameter.