As one of the deep-sea mining collection methods,the Coandă-effect jet has been widely accepted,but existing studies have paid little attention to the detachment of nodules and sediment disturbance characteristics,resulting in an inability to accurately evaluate the mining effects of nodules under Coandă-effect flow fields and their impact on the deep-sea environment.This study analyzed the characteristics of Coandă-effect jet erosion mining of nodules and seabed disturbance under different parameters,and optimized the mining parameters.The results show that under the jet mining action,the seabed forms an irregular elliptical erosion pit after disturbance;the erosion pit depth is positively correlated with the jet velocity and jet angle,and it first increases and then decreases with the increase of curvature radius of the attached wall plate,with the optimal curvature radius of the attached wall plate is being 100 mm;when the jet velocity is less than 5 m/s,considering the lifting efficiency,the optimal jet angle is 55°,and when the jet velocity is higher than or equal to 5 m/s,considering the low disturbance requirement,the optimal jet angle is 45°,the best mining parameter combination is jet velocity of 5 m/s,jet angle of 45°,and attached wall plate curvature radius of 100 mm.a predictive formula for the disturbance depth of deep-sea hydraulic mining jets has been established,providing a reference for the low-disturbance optimization design of actual deep-sea hydraulic mining equipment.
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