Multi-objective automatic optimization design of a parameterized Kap-type propeller

The Kappel propeller has attracted considerable attention for its favorable hydrodynamic performance, yet further efficiency improvement under complex marine conditions remains challenging. This paper proposes a parameterized modeling and multi-objective optimization framework for Kap-type propeller. The F-spline technique is used to reconstruct and control the three-dimensional blade geometry, while point cloud-baded reverse engineering and experimental data are employed to validate the modeling and numercial simulation procedures. The results shows that the modified Kappel propeller improves propulsion efficiency by approximately 2.4%. Furthermore, an optimization framework coupling CFD with NSGA-II is established, with the thrust coefficient and open water efficiency as objective functions. Under the design condition, the optimized propeller increases open water efficiency by 3.62% and thrust coefficient by 6.51%. The proposed method effectively improves propulsive performance and provides a technicial reference for the parametric design and optimization of marine propellers.