The numerical simulation of rock fragmentation efficiency under self-excited oscillation pulsed jet
SI Hu1,2，XUE Yong-zhi1,2，ZHOU Wei1,2
1. Department of mineral engineering，Chongqing University，Chongqing 400044，P.R.China；
2. State Key Laboratory of Coal Mine Disaster Dynamics and Control，Chongqing 400044，P.R.China
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.
司鹄1,2，薛永志1,2，周维1,2. 自激振荡脉冲射流破岩效率数值模拟[J]. 振动与冲击, 2016, 35(20): 149-153.
SI Hu1,2，XUE Yong-zhi1,2，ZHOU Wei1,2. The numerical simulation of rock fragmentation efficiency under self-excited oscillation pulsed jet. JOURNAL OF VIBRATION AND SHOCK, 2016, 35(20): 149-153.
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