Study on the Graph Final Design of a Ship CPP

Aiming at the problems that a ship’s Controllable Pitch Propeller(CPP) of insufficient load power and low power-weight ratio did not fully utilized the rated power of the main engine(M/E), we redesigned the CPP by the graph method. Firstly, introduced the structure and function of the main components of the CPP, and analyzed the theoretical basis of the CPP graph design, then selected the CPP’ type according to the main parameters of the M/E and hull. Secondly, with the graph method, calculated the maximum ship speed and determined the optimal elements of the CPP driven by the M/E rated power and other M/E power, and converted the best factor of other power CPP according to the design propeller diameter. Then, check the strength and cavitation performance of CPP. Thirdly, calculated the navigation characteristics of refrigerated ships to verify the graph design results. Finally, summarized the graph design and drawn the blade extension profile. The Research results show that the CPP can make full use of the M/E rated power after the graph final design, and the CPP power-weight ratio can be improved by retaining the original hub and increasing the blade diameter and area ratio, The method of the graph final design is usable and effective.