Multi-objective optimization design method of marine propeller based on fluid-structure interaction

To improve the quality and efficiency of propeller design and obtain the best design scheme of the propeller, an integrated automatic optimization design method of propeller is proposed by combining Fluid-Structure Interaction (FSI), Design of Experiment (DoE), and Non-dominated Sorting Genetic Algorithm II (NSGA-II). FSI calculation method instead of hydrodynamic calculation can make the propeller performance calculation more accurate. Sobol algorithm is used for DoE, the correlation between propeller parameters and the objective function is analyzed to obtain propeller sensitive parameters. The sensitive parameters are optimized by NSGA-II to obtain the best design scheme. Under the requirements of ensuring the thrust coefficient and structural strength of the propeller, the radial distribution of the skew, chord length, pitch, and camber is optimized, and finally, a design scheme with higher efficiency, larger thrust, and safer structure is obtained. Take the KP505 propeller as an example. The results show that the design method has higher efficiency and a wider solution set range, which is more suitable for practical engineering applications.