Optimization Research on Diameter and Speed Matching for a Rim-Driven Thruster

Le résumé fourni par la source

As research hotspot of high-performance electric propulsion devices for ships, the efficiency improvement of rim-driven thrusters (RDTs) is of great significance for their application and promotion. However, the matching of diameter and rotational speed of RDTs is often neglected in the design and optimization process. In order to further improve the efficiency of RDTs, this paper focuses on the matching optimization of its diameter and rotational speed, taking a 20kW RDT as an object. The open water performance under different diameters and rotational speeds through numerical simulation is obtained to explore the matching laws of diameter and rotational speed, and to optimize the efficiency of the RDT under the premise of guaranteeing the power demand. The results show that the matching of the diameter and rotational speed of the RDT has a direct effect on the key performance indices such as thrust, torque and efficiency of the thruster. Under the same rotational speed, increasing the blade diameter, the open-water efficiency increases and then decreases, while the thrust coefficient and torque coefficient decrease and then increase; keeping the same diameter, increasing the rotational speed, the open-water efficiency increases, the torque coefficient decreases and the thrust coefficient is basically unchanged. After matching optimization, the efficiency, thrust coefficient, and torque coefficient of the RDT improved by 0.75%, 2.82%, and 4.22%, respectively. A reasonable matching design can effectively improve the overall performance of RDTs, and this study can provide an important reference for parameter matching in the design and optimization of RDTs.

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