基于任意拉格朗日-欧拉流固耦合罚函数算法，建立自激振荡脉冲射流破碎岩石的数值计算模型。对比相同工况下的数值模拟结果与实验结果进行模型验证。根据自激振荡脉冲射流的自身运动规律对其破岩过程进行数值模拟，结合岩石岩性分析脉冲振幅和脉冲频率对破岩效率的影响。结果表明：随着脉冲振幅的增大，冲蚀深度先后经历线性快速增长和平缓增长阶段，破岩效率显著提高；岩石的岩性会影响冲蚀深度的增长速率；随着脉冲频率的增大，冲蚀深度表现出先增大后减小最后趋于稳定的变化趋势；自激振荡脉冲射流破岩存在一个最优脉冲频率，该频率下破岩效率显著提高，且不同岩石具备不同的最优脉冲频率。数值模拟方法较好地还原了自激振荡脉冲射流破岩的物理过程，为自激振荡脉冲射流在地下工程领域的应用有一定指导意义。
Abstract
Based on the Arbitrary Lagrangian-Eulerian fluid-solid coupling penalty function method, a model of rock breaking under self-excited oscillation pulsed jet was established. The result of numerical simulation was compared with experimental result under same condition to validate the model. In order to analyze the influence of pulse amplitude and pulse frequency on rock fragmentation efficiency relate to features of rocks, the process of self-excited oscillation pulsed jet impacting rock under different conditions was simulated according to its motion law. The results show that with the increase of pulse amplitude, the erosion depth has successively undergone rapid growth phase and gradual growth phase, while the erosion aperture basically remains unchanged, as a result, the rock fragmentation efficiency improves significantly. Besides, the results also show that with the increase of pulse frequency, the erosion depth decreases after the first increase, while the erosion aperture basically remains unchanged. Hence, it exists an optimal pulse frequency under which the rock fragmentation efficiency has a great improving. And different rocks have different optimal pulse frequency. The results of simulate process are identical with reality and had partly guiding significance to the engineering usage.
关键词
自激振荡脉冲射流 /
破岩效率 /
脉冲振幅 /
脉冲频率
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Key words
self-excited oscillation pulsed jet /
rock fragmentation efficiency /
pulse amplitude /
pulse frequency
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