Influence and efficiency analysis of high-energy laser irradiation parameters on rock perforation characteristics
In order to investigate the influence of laser parameters on the rock breaking effect,a study on the perforation effect of laser irradiated rock was carried out.With the help of MATLAB software,the macroscopic expansion morphology of thermal cracks around the melting pit holes was obtained,and the influence of the laser rock breaking parameters on the thermal cracking characteristics of the rock was revealed.The quantitative relationship between the laser energy consumption and the melting pit hole volume was analyzed,and the influence laws of laser parameters on specific energy and specific kerfing energy and rate of penetration were elucidated.The results showed that laser irradiated rock first generated melting pit holes around the irradiation point,and then the thermal microcracks around the holes expanded and developed to form radiative macroscopic thermal cracks.With the increase of laser power and irradiation time,the cumulative total area and cumulative total length of sandstone thermal cracks increased,and the volume of melting pit holes gradually increased.Taking into account the melting pits volume,macroscopic thermal crack formation conditions,and rock-breaking efficiency,it was recommended that the laser power should not be less than 4 kW,and the irradiation time should not exceed 5 s.
thermal crackmelting pit holespecific energyspecific kerfing energyrate of penetration
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