| Ship magnetic fluid propulsion technology has received widespread attention since its introduction.This type of propeller is mainly a new type of propulsion that uses the interaction between the current and the magnetic field in seawater to move the seawater and its reaction force to propel the ship forward.Because the propulsion mode does not have a propeller and other transmissions,it has the advantages of high speed,quietness,easy operation,and flexible layout.It will have a place in the 21 st century special ship propulsion technology.The paper introduces in detail the development process of ship propulsion technology and magnetic fluid propulsion technology,and also elaborates on the research progress of magnetic fluid propulsion technology at home and abroad in recent years.The types of existing magnetic fluid propulsion vessels are summarized in detail.The system composition of superconducting magnetic fluid propulsion vessels is analyzed,and the overall design method of magnetic fluid propulsion vessels is studied.The paper points out the main technical problems in the current stage of ship magnetic fluid propulsion technology in superconducting magnets,low temperature refrigeration and so on..In order to solve the problem of insufficient magnetic field strength in AC magnetic fluid propulsion,the paper puts forward the idea of applying high temperature superconducting magnet to marine magnetic fluid propulsion,and proposes the design of superconducting magnet protection system for magnetic fluid propulsion.The paper designs the quench detection,quench protection and superconducting magnet refrigeration system of the superconducting magnet in the magnetic fluid propeller to ensure the stable operation of the magnetic fluid vessel using the high temperature superconducting magnet.The quench detection circuit based on voltage measurement and the quenching protection method of superconducting magnet combined with active protection and passive protection are designed.Then the refrigeration system of high temperature superconducting magnet is designed.Based on the basic equations of the DC internal magnetic fluid propulsion,the fluid continuity equation and the mathematical model of the equation of motion,the mathematical modeling of the AC magnetic fluid propeller is carried out and the boundary conditions are given,and the thruster is given.Steady state operation is analyzed.The controller design of the AC magnetic fluid thruster is then based on the particle swarm optimization algorithm.Finally,under the influence of the Stewart number,electromagnetic parameters,Reynolds number and magnetic field frequency of the ship’s magnetic fluid propulsion,the state of the AC magnetic fluid propeller during steady-state operation is simulated and analyzed,and then the control effect of the controller is simulated.The simulation results are analyzed and studied,and the simulation results show that it has better control effect.The paper designs the superconducting magnet protection method for high-temperature superconducting magnetic fluid propulsion,and analyzes the simulation results of superconducting magnetic fluid propulsion steady-state operation,which lays a foundation for the further practical application of AC superconducting magnetic fluid propulsion in the future. |
