摘要
通过分析水力喷砂射孔机理,建立了磨料射流形成过程的动力学模型,推导出了液相的加速表达式以及磨料颗粒在喷嘴内的运动方程;基于塑性材料破坏的第四强度理论和岩石破坏的库伦-摩尔准则,建立了球形磨料颗粒对套管、岩石打击过程的力学模型,推导出了磨料颗粒的极限速度表达式;借助MATLAB软件,使用迭代法对上述力学模型进行了计算验证。研究结果表明:在喷嘴结构参数和颗粒直径不变时,液相速度越大、加速度越大,则磨料颗粒的加速也会越快;而磨料颗粒对材料的冲击作用力不仅与靶件本身的性能参数有关,还与颗粒的冲击速度和密度呈正相关。
Through the analysis of the mechanism of hydraulic sand jet perforation, the kinetic model of the formation process of abrasive jet is established, and the acceleration expression of the liquid phase and the motion equation of abrasive particles in the nozzle are derived; based on the fourth strength theory of plastic material breaking and the Coulomb-Moore code of rock breaking, the mechanical model of the blow process from the spherical abrasive particles to casing and rock is established, the expression of the limit speed of abrasive particles is derived. Finally, using MATLAB software, the above mechanical model is verified by iterative method. The results show that the higher velocity and the larger acceleration of the liquid phase, the faster accelerated process of abrasive particle when the nozzle structure parameters and grain diameter are unchanged; the impact force of abrasive particles on the material is not only related to the performance parameters of the target, but also positively correlated with the impact velocity and density of particles.
出处
《应用力学学报》
CAS
CSCD
北大核心
2018年第5期1089-1095,共7页
Chinese Journal of Applied Mechanics
关键词
水力喷砂射孔
破坏准则
加速过程
力学模型
迭代法
hydraulic sand jet perforation
breaking rule
acceleration process
mechanical model
iterative method
