Study on the effect of jet velocity on the characteristics of double-jet ore collection

In dual-jet deep-sea mining technology, jet velocity ratio significantly affects the acquisition rate. In this study, CFD - DEM method was adopted to explore the velocity, pressure and vortex characteristics of the collecting flow field and predict the harvesting performance at the jet velocity ratios of 0.625, 0.75 and 0.875. Based on the experimental and theoretical results, the influence of the velocity ratio on the flow field was revealed. For accurate particle motion characteristics at different jet velocity ratios, particle tracking method combined with Nadaraya - Watson regression was used to analyze particle motion. The results indicate that as the jet velocity ratio increases, the flow pattern becomes more complex, with an increase in both the complexity and intensity of vortices. Although particle velocity is enhanced, the unpredictability of particle movement also rises. Moreover, particles tend to accumulate in the fore board area, with the 0.625 jet velocity ratio exhibiting the least aggregation and the minimal impact on particles, thus achieving the highest overall collection efficiency.