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Publications
Liu, J.X., Wei, XX., Qin, P., He, B. and Guedes Soares, C. (2024), CFD simulation and experimental validation of novel cutting device for underwater propeller entanglements, Ocean Engineering, Vol., 118400
A novel cutting device is proposed for underwater propeller entanglements, which has different cutting strategies for various types of entanglements. The rotating cutter is embedded in the propeller and follows the rotation without additional actuation. The impact of the cutter on the propeller's propulsion performance is investigated by computational fluid dynamics simulations. Open water and self-propulsion simulations are performed utilising the Reynolds-Averaged Navier-Stokes method with a multiple reference frames model. Hydrodynamic performance at different rotational speeds is predicted using the response surface methodology, and the propulsive characteristics are contrasted with and without a cutter. For open water, the difference in efficiency is more significant at medium and high advance velocities. Rotating the cutter changes the pressure distribution and thus affects propulsion performance. However, the self-propulsion simulations show that the cutter has a negligible effect on propulsion performance. Tank experiments demonstrate that the cutting device can effectively resolve various entanglements, enabling the propeller to recover normal rotation. The success rates for cutting entanglements are over 80%. Nevertheless, there is a significant increase in propeller torque when performing cutting tasks, which requires that effective cutting operations should be carried out in a manner that guarantees the safety of the motor.
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