水力喷射工具外壁反溅冲蚀数值分析

Numerical Simulation of Spray Erosion of Hydraulic Jet Tool

水力射孔技术利用高速含颗粒两相流的冲蚀作用对目标壁面打孔或切割作业,在射孔过程中高速两相流会反溅至工具外壁引起冲蚀破坏,严重时会使工具失效。本文利用欧拉-拉格朗日模型计算高速颗粒喷射反弹后的运动状态,得到水力射孔工具外壁的反溅冲蚀速率及区域,得到颗粒的反溅运动规律及反溅冲蚀的主要影响因素。计算结果显示随着射孔孔深的变化,颗粒反溅撞击速度和角度发生改变;随射孔深度增加反溅冲蚀速率降低,而反溅冲蚀区域增大;反溅冲蚀速率会随着喷射速度增大而增加,而反溅冲蚀区域基本不受喷射速度影响。因此,反溅冲蚀速率主要受射孔液喷射速度影响,而反溅冲蚀区域主要受射孔深度影响。

Hydraulic perforating technology uses the erosion of high velocity solid-liquid flow to punch or cut the target wall.However,during the perforating process,the high velocity two-phase flow will be rebounded to the outer wall of the perforating tool to cause its erosion damage,and in severe cases,the tool will fail.The Euler-Lagrange model is used to calculate the motion state of the rebounded high-speed particles and the erosion rate and area on the outer wall of the hydraulic perforating tool,and determine the movement law of the particles and the main factors affecting the erosion.The results show that the impact velocity and angle of particles change with the change of perforation depth:with the increase of perforation depth,the erosion rate decreases,while the erosion area increases;the erosion rate increases with the increase of jet velocity,while the erosion area is not affected by jet velocity.Therefore,the erosion rate is mainly affected by the jet velocity of the perforating fluid,and the erosion area is mainly affected by the depth of the perforation.