| Debye magnetic field for wake of underwater vehicle,one of the important physical characteristics of wakes,plays an important role in marine exploration,targets tracking and anti-reconnaissance.The high-speed rotation of underwater vehicle propeller drives the inorganic salt particles in seawater to move in water,weak electric currents are induced in moving seawater by disturbed sea water particle.These electric currents can produce measurable electromagnetic field that may be used for some purposes such as monitoring of ocean internal waves.This article optimizes the geometry of underwater vehicle to drag reduction,with the help of Fluent software,the simulation calculation hydrodynamic performance of the different geometric structure of underwater vehicle.The Debye magnetic field for wake of underwater vehicle and shaft-rate electromagnetic field the creation principle,difference and connection,are analyzed according to hydrodynamics and the theory of Maxwell’s equations Mathematical model of the Debye magnetic field for wake of underwater vehicle is established based on the geometrical structure of underwater vehicle.The distribution of the Debye magnetic field for wake of underwater vehicle is simulated by use of COMSOL simulation software.Main contents of the research are as the following.Firstly,hydrodynamic performance simulation analysis of underwater vehicle shape scheme is carried out.By using the geometric combination method of precise mathematical expression and the description and design method of streamline body shape,the geometric mechanism of common underwater vehicles is simulated by MATLAB simulation software,based on the knowledge of hydromechanics,using computer,numerical method and approximate processing methods,the fluid simulation software Fluent was used to carry outhydrodynamic analysis of the torpedo type underwater vehicle with five shape schemes.The simulation results showed that the navigational resistance and wake shape of the underwater vehicle were related to the geometric structure of the underwater vehicle.Secondly,mathematical model of Debye magnetic field for wake of underwater vehicle is set up.A model algorithm is introduced to identify the geometric structure,sailing speed and submerged depth of underwater vehicles by using water surface waveform.Production mechanism of Debye magnetic field for wake of underwater vehicle and shaft-rate electromagnetic field is systematically.The high-speed rotation of underwater vehicle propeller drives the inorganic salt particles in seawater to move in water,weak electric currents are induced in moving seawater by disturbed sea water particle.These electric currents can produce measurable electromagnetic field.And analyzes the difference and relation between Debye magnetic field and shaft-rate electromagnetic field and the mathematical model of Debye magnetic field for wake of underwater vehicle is established.According computer simulation,the relationship between the Debye magnetic field for wake of underwater vehicle and the speed,geometry and depth of underwater vehicles,and the Debye magnetic field for wake distributed variation characteristic.Thirdly,the Debye magnetic field simulation system is established based on the finite element COMSOL simulation software.The main function of the simulation system is to visually simulate the distribution of Debye magnetic field generated for wake of underwater vehicle,the simulation software has a large number of built-in partial differential equations,basically do not need their own programming.Based on the particle tracking method,a simple dynamic simulation of the underwater vehicle is carried out,it gives its velocity cloud diagram and pressure contour distribution diagram.A simple underwater vehicle waterwheel wing type simulation system is designed to simulate the geometry of different waterwheel wing type mechanisms.The software uses difference method and functional analysis for numerical solution,its expansibility is better than other finite element simulation software.The magnitude and weakness of Debye magnetic field detection induced for wake of underwater vehicle,it is affected by factors such as laboratory conditions,therefore,this paper to computer modeling and simulation.It is necessary to further study the generation mechanism and wake characteristics of Debye magnetic field for wake of underwater vehicle,and make use of these characteristics to accurately detect underwater targets. |
