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新型液动冲击器液固两相流冲蚀数值模拟 被引量:1

Liquid-solid two-phase flow erosion numerical simulation of neo-type hydraulic impactor
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摘要 针对液动冲击器在泥浆钻进过程中因冲蚀严重而无法实现工业化应用的问题,从结构创新角度设计了一种抗冲蚀的新型液动冲击器。以液固两相流动力学和冲蚀理论为基础,建立液动冲击器冲蚀模型,采用拉格朗日粒子追踪算法计算固相颗粒运动轨迹,基于液动冲击器内部流场分析预测冲击器冲蚀区域分布、颗粒冲击速度对主要零件(冲锤、上套筒和外壳)冲蚀的影响及其工作寿命。由数值模拟结果可知:冲蚀区域主要集中在冲锤上腔的底面、冲锤边角处、流道孔进口壁面、上套筒呼吸孔进口处以及上部壁面;冲锤、上套筒和外壳的平均冲蚀率与冲击速度呈幂函数关系,速度因子在1~4之间;根据对比分析可知,新型冲击器关键零部件的耐冲蚀寿命与现有冲击器射流元件相比有明显提升。研究工作对推动新型液动冲击器工业化应用有较为重要的参考价值。 Aiming at the problem that the hydraulic impactor cannot be industrialized because of serious erosion during mud drilling,a neo-type hydraulic impactor for anti-erosion was designed from the point of structural innovation.Based on the liquid-solid two-phase flow dynamics and erosion theory,the hydraulic impactor erosion model was established.The Lagrange tracing algorithm was applied to calculate the movement trajectory of solid particles,and the distribution of erosion area,the influence of particle impact velocity on erosion of the main working elements(impact hammer,upper sleeve and shell)and their working life were predicted based on the inner velocity distribution analysis of neo-type hydraulic impactor.According to numerical simulation results,the erosion area was concentrated on the bottom of upper chamber of hammer,impact hammer corner,inlet wall of the orifice,inlet of the flow channel hole in piston upper chamber and upper wall in upper sleeve.Power function relationship was identified with tool average erosion rate and impact velocity with velocity factor of 1-4.Theoretical anti-erosion life of key working elements of neo-type impactor had an obvious improvement under comparative analysis of existing impactor.The research work has important reference value for promoting the industrial application of the neo-type hydraulic impactor.
作者 祝效华 范诚 刘上 ZHU Xiao-hua;FAN Cheng;LIU Shang(School of Mechatronic Engineering,Southwest Petroleum University,Chengdu 610500,China)
出处 《工程设计学报》 CSCD 北大核心 2019年第1期87-94,共8页 Chinese Journal of Engineering Design
基金 国家自然科学基金资助项目(51674214) 四川省青年科技创新团队项目(2017TD0014)
关键词 钻井 液动冲击器 冲蚀 流场分析 drilling hydraulic impactor erosion flow field analysis
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