基于SPH-FEM耦合算法的后混合磨料水射流冲击破岩数值模拟研究

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摘要

采用SPH-FEM(smoothed particle hydrodynamics with finite element method)模拟了后混合磨料水射流在喷嘴中的混合过程，并研究了射流速度、磨料浓度以及岩石围压等因素对后混合磨料水射流破岩效果的影响规律。研究结果表明：在柱塞推动下，水与磨料在喷嘴的混合段、收敛段与直线段分别获得加速，最终磨料的速度可增加至纯水速度的80%；岩石破碎深度随射流速度呈近似线性增加，而破碎宽度随射流速度变化不大；磨料射流较纯水射流的破岩损伤更加明显，岩石的损伤随磨料浓度呈先增大后减小的趋势；岩石的破碎深度随着围压的增加呈近似线性减小的趋势。数值模拟结果与破岩实验现象基本吻合，该研究结果可为磨料水射流破岩的应用提供一定的理论支撑。

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	米建宇
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	李丹

关键词 ：后混合磨料水射流, 岩石破碎, 磨料浓度, 射流速度, 围压作用

Abstract：

An algorithm of smoothed particle hydrodynamics coupled with the finite element method (SPH-FEM) was applied to simulate the mixing process of rear-mixed abrasive water jet in the nozzle.Then, the influence of jet velocity, abrasive concentration, confining pressure, etc., on the rock breakage was studied further.It’s indicated that the pure water and the abrasive particles were accelerated respectively by the piston in the mixing section, convergent section, and line section, but the finial velocity of abrasive particles can only reach about 80 percent of the water velocity.The rock breaking depth increases linearly with jet velocity while the breaking width nearly keeps constant.The rock damage induced by the abrasive water jet is much more obvious than that by the pure water jet, and the damage degree presents a first increasing and then decreasing tendency with the abrasive concentration.The rock breaking depth decreases approximately linearly with onfining pressure.The simulation result is nearly in line with the experimental result, so this paper can provide some basic theory for the application of abrasive water jet breaking rock.

Key words： rear-mixed abrasive water jet rock breakage abrasive concentration jet velocity confining pressure

收稿日期: 2020-10-16 出版日期: 2021-08-28

引用本文:

米建宇，黄飞，李树清，王荣荣，李丹. 基于SPH-FEM耦合算法的后混合磨料水射流冲击破岩数值模拟研究[J]. 振动与冲击, 2021, 40(16): 132-139.
MI Jianyu，HUANG Fei，LI Shuqing，WANG Rongrong，LI Dan. Numerical simulation of rock breaking by rear-mixed abrasive water jet based on an SPH-FEM coupling algorithm. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(16): 132-139.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2021/V40/I16/132

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