Abstract: Aiming at the problem of low work efficiency of offshore waste salvage equipment, the effects of different speed and different underwater depth on the suction speed and pressure of the suction unit were studied. The numerical calculation model of the suction port was built by using SolidWorks three-dimensional software. Numerical simulation was carried out for the suction unit of the device based on the Workbench-Fluent module. The mapping relationship between the working condition parameters of the suction port and the suction speed and pressure was established based on the Kriging approximate model. The multi-objective optimization of the suction port was carried out in combination with NSGA-II algorithm to seek its best working condition parameters. The results indicate that the suction speed and pressure of the suction unit in the offshore waste salvage device increases with the increase of the ship speed; when the underwater depth of the suction port increases from 50mm to 150mm, the suction speed and pressure also increase with it. When the ship speed v=9.79m/s and the underwater depth h=102mm, the suction speed is increased by 12.3% and the suction pressure is increased by 13.2%, which implies the suction efficiency is significantly improved.

Key words:  salvage device; flow field analysis and optimization;joint simulation model; Kriging approximate model; NSGA-II algorithm; multi-objective optimization

WANG Chun, YAN Ji-yuan, YANG Fu-qin, et al.Flow field analysis and optimization of offshore waste salvage device[J].Journal of Mechanical & Electrical Engineering,2022，39（2）：158-165.