40 results about "Magnetohydrodynamics" patented technology

The invention provides an insulating material surface arc ablation resistance simulation method based on magnetohydrodynamics, and belongs to the field of insulating material performance detection. The method comprises the following steps: establishing an insulating material surface arc ablation resistance model; constructing a magnetohydrodynamic control equation set; setting boundary conditions of the model; and iteratively solving the magnetohydrodynamic control equation set through finite element simulation software to obtain a temperature distribution diagram of the insulating material under different arc ablation times, and comparing the temperature distribution diagram with a TGA curve of the insulating material to judge the arc ablation resistance of the insulating material. According to the invention, the power-frequency alternating-current high-voltage arc and the insulating material are used as simulation objects, engineering practice is better met, the surface arc ablation resistance process of any insulating material can be simulated by changing the physical characteristic parameters of the insulating material, and the TGA curve of the material is introduced to judge the arc ablation resistance of the insulating material. And technical support is provided for high-voltage switch equipment insulating material type selection.

The invention provides a cable fault arc temperature distribution calculation method based on multi-physics field coupling, and the method comprises the steps: building a cable fault arc simulation model; setting boundary conditions of multi-physics field coupling of an electric field equation, a magnetic field equation, a fluid heat transfer equation and a laminar flow equation for the cable fault arc simulation model; the arc temperature distribution is obtained by controlling the voltage and current parameters of the arc simulation loop, the distance between the copper core conductor and the grounding electrode and the air velocity. A cable fault arc simulation model is built, high risks of electric shock and explosion in laboratory tests are avoided, the loss cost of laboratory test equipment is reduced, the defect that only the peripheral temperature of the arc can be measured in the laboratory tests is overcome through a multi-physics field coupling equation, and global continuous arc temperature data are obtained. And a theoretical basis is provided for power system protection design, cable laying optimization, fire-fighting strategy formulation and cable fire risk assessment.

The invention discloses a nuclear magnetism safety interval confirmation device, and the device comprises a quantum noise suppression module which is used for eliminating radar signal noise caused by the quantum tunneling effect on the surface of a metal object in an ultrahigh field intensity environment; the multi-sensor fusion center is used for integrating the radar cleaning signal, the real-time magnetic field intensity data and the terahertz penetrability detection result to generate fused object position information; the dynamic magnetic field reconstruction engine is used for calculating a magnetic field distortion gradient by analyzing Hall sensor array data and a magnetohydrodynamic model in real time; the nonlinear danger scoring module is used for receiving object distance, magnetic field gradient, existence time and object classification data; the hierarchical response system is used for triggering a corresponding response according to the danger score; and the cesium atomic clock synchronization module is used for eliminating a timing error caused by a time crystal effect through a block chain timestamp verification mechanism. According to the invention, risk closed-loop control in a high-field-intensity MRI environment is truly realized.

The invention provides a fan blade lightning attachment simulation prediction method and system based on magnetohydrodynamics, and the method comprises the steps: S1, constructing a mathematical model of a fan blade, and building a two-dimensional geometric model of the mathematical model; s2, arranging a spherical discharge electrode on the two-dimensional fan blade model; s3, electromagnetic and thermal material parameters are given to the two-dimensional fan blade model and the spherical discharge electrode; s4, applying a lightning current load on the spherical discharge electrode, and grounding a central wheel disc area of the two-dimensional fan blade model; s5, the surface boundary areas of the spherical discharge electrode and the fan blades are encrypted; s6, simulating the lightning attachment process of the fan blade; s7, representing a starting position and a spatial development trend of lightning leader and a dynamic evolution process formed by a discharge channel; and S8, determining the final attachment position of thunder and lightning. The lightning attachment position is accurately predicted, a lightning attachment mechanism and influence factors are disclosed, and key technical support is provided for lightning protection design and airworthiness conformity verification of aero-engine fan blades.

external magnetic field - coil with right-hand winding (4) resting on the outer surface of the annular cathode electrode as an encompassing device to generate a magnetic field which, in interaction with the electrolyte current, causes a "Lorentz force" to magnetohydrodynamically accelerate the faster detachment of hydrogen gas bubbles from the outer cathode surface

The application relates to the technical field of meat processing, in particular to a vacuum circulation pickling method for meat. The method comprises the following steps: submerging meat pieces to be pickled in pickling liquid added with 0.1% hematin iron; first, applying a transient high-voltage electromagnetic pulse to precisely perforate the cell membrane of the meat; then, applying an alternating vortex magnetic field with a specific frequency; utilizing the high-frequency micro-vibration of the hematin iron in the magnetic field to generate a magnetohydrodynamic effect, expand the micro-pore channel and pump the pickling material molecules into the cell interior; finally, combining vacuum circulation alternating treatment to further press the pickling material into the tissue gap. The added hematin iron significantly enhances the promotion effect of the magnetic field on the pickling material delivery, and the pickling time is shortened to 30 minutes or less. It is proved through measurement that the pickling liquid absorption rate of the process is high, the penetration reaches the geometric center of the meat pieces, and the integrity and water holding capacity of the meat structure are perfectly preserved.

The invention discloses a method for electrically reducing carbon dioxide by using a magnetic field enhanced membrane electrode electrolytic cell, and relates to the technical field of electrochemistry, the method comprises the following steps: S1, mixing a catalyst with sludge pyrolysis coke to obtain a composite catalyst; s2, preparing a gas diffusion electrode by adopting a composite catalyst; s3, assembling a membrane electrode electrolytic tank by a gas diffusion electrode, an anode, an anion exchange membrane, a cathode collector plate, an anode collector plate and an electromagnet, and injecting electrolyte; and S4, electrifying the electromagnet to form a stable magnetic field, introducing CO2, and switching on a power supply of the electrolytic tank to carry out electroreduction of CO2. Through compounding of the catalyst and the sludge pyrolysis coke and arrangement of the electromagnet in the membrane electrode electrolytic tank, the magnetohydrodynamic effect is enhanced, the mass transfer process of CO2 and products is enhanced, and efficient electric reduction of CO2 to generate formic acid is realized.

The invention discloses an electric arc simulation method of an HSS under clean air insulation and a related device, and the method comprises the steps: taking clean air as an insulating medium and an arc extinguishing medium, and building a two-dimensional axisymmetric geometric model of a DC high-speed parallel switch arc extinguishing chamber; calculating physical property parameters of the electric arc in the clean air based on the geometric model, wherein the physical property parameters comprise thermodynamic properties and transportation parameters; constructing a magnetohydrodynamic model according to a Navier-Stokes equation and the physical property parameters, wherein the magnetohydrodynamic model comprises a fluid equation and an electromagnetic field equation; based on a preset k-epsilon turbulence model, the magnetohydrodynamic model is solved through Fluent, and arc airflow field parameters are obtained; and performing arc simulation operation according to the arc airflow field parameters to obtain a target clean air arc. The technical problem that existing HSS application is not environment-friendly due to the lack of research on plasma characteristics and arc extinguishing capability of clean air HSS arcs in the prior art can be solved.

The invention relates to the technical field of ocean geophysical exploration, and provides an island tail flow induced electromagnetic field simulation method based on magnetohydrodynamics. The method comprises the following steps: constructing a three-dimensional island wake flow fluid dynamic model; coupling an equation for describing seawater motion with a Maxwell equation set for describing electromagnetic field evolution, and constructing a magnetohydrodynamic control equation set; modeling the turbulence effect of seawater movement; the magnetohydrodynamics control equation set is solved, the ocean current velocity field and the induced electromagnetic field intensity are obtained, and the induced electromagnetic field intensity comprises the induced electric field intensity and the induced magnetic field intensity. The three-dimensional island wake flow hydrodynamic model constructed by the method comprehensively considers the seawater vertical layering flow velocity profile and background geomagnetic field parameters, and the constructed magnetohydrodynamic control equation set fully considers the seawater motion, so that the model can truly reflect a terrain-flow field-electromagnetic field multi-scale coupling mechanism.

The invention discloses a mass spectrometer ion source transmission efficiency characteristic simulation analysis method based on multi-physics field coupling, and relates to the technical field of mass spectrometry, and the method comprises the steps: carrying out discretization processing through a grid division method, and generating a grid model suitable for multi-physics field simulation; on the basis of the grid model, ions generated by electrospray are equivalent to particles by coupling a turbulence model, a dispersed phase model and a magnetohydrodynamic model, and a multi-physical field simulation model is constructed; obtaining internal flow field distribution, electric field intensity distribution and ion trajectory data of the mass spectrometer ion source through a numerical calculation method according to the multi-physical field simulation model and preset boundary conditions, and calculating ion transmission efficiency data according to the flow field distribution, the electric field intensity distribution and the ion trajectory data; and generating a transmission efficiency characteristic curve of the mass spectrometer ion source prototype through a parameterized simulation method according to the ion transmission efficiency data. The method is used for realizing accurate simulation of the internal physical process of the ion source.

This application discloses a supercapacitor working electrode, its fabrication method, and the supercapacitor itself, belonging to the field of capacitor technology. The supercapacitor working electrode of this application comprises a conductive substrate and an electrode active layer grown in situ on the surface of the conductive substrate. The electrode active layer comprises an inorganic metal oxide nanocrystalline film, which is a continuous conductive structure formed by the interconnection of single chiral inorganic metal oxide nanocrystals. The supercapacitor working electrode of this application possesses a chiral-induced spin-selectivity effect, achieving spin-polarized charge transport without relying on magnetohydrodynamic convection / Lorentz force driving, effectively improving the specific capacitance, rate performance, and cycle stability of the supercapacitor.

The application relates to the technical field of insulation bus fault early warning, and discloses a real-time monitoring fault early warning method for an insulation bus, which comprises the following steps: S1, temperature sensors and partial discharge sensors are arranged at key points of the insulation bus; an anti-interference acquisition circuit and a temperature-compensated crystal oscillator differential synchronous acquisition mechanism are adopted to synchronously acquire temperature and partial discharge original signals; S2, the original signals of step S1 are input into an error self-correction model combined with Kalman filtering and LSTM (Long Short Term Memory) to perform calibration and dynamic compensation, and high-fidelity temperature and partial discharge characteristic data are output. The real-time monitoring fault early warning method for the insulation bus improves data fidelity from the source through the anti-interference acquisition circuit and the differential synchronous acquisition mechanism, realizes high-precision calibration of signals in combination with the error self-correction model, and applies the principle of magnetohydrodynamics to partial discharge monitoring to solve the problems that signals are easily submerged and the sensitivity is insufficient in traditional electric measurement methods.

An electrolyte impregnation device of a secondary battery according to an embodiment of the present disclosure includes: a transfer part configured to move the secondary battery in a first direction; and a magnetic field application part for applying a magnetic field in a second direction to the secondary battery moved by the transfer part.A magnetic field is applied to an electrolyte flowing in a first direction, causing a magnetohydrodynamic convection flow in the electrolyte, especially a small magnetohydrodynamic convection flow near an electrode, such that, under the synergistic action of such flow force and the buoyancy force received by the bubbles, the bubbles on the surface of the electrode are moved to a gas pocket portion of the secondary battery, thereby removing the bubbles in the electrode assembly, thereby improving the impregnation performance of the electrolyte.

1. Name of the product in this design: Magnetofluid Audio System. 2. Purpose of this design: for use in audio equipment. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The invention relates to the technical field of metal surface treatment and protection, and discloses a preparation method of a corrosion-resistant and scratch-resistant aluminum alloy electroplated nickel-gold double-plating layer, which comprises the steps of surface pretreatment, electroplating liquid preparation, integration of a magnetohydrodynamic stirring system, adoption of a pulse reverse electroplating technology, real-time monitoring of process parameters and the like. A plating solution flow field and an ion migration path are optimized through an alternating magnetic field, the deposition rate is controlled in combination with pulses, and the uniformity and performance of a plating layer are remarkably improved. And the thickness fluctuation of the prepared nickel-gold double-plating layer is within + / -0.1 micron, the hardness is 300-500 HV, the corrosion resistance is excellent, and the nickel-gold double-plating layer is suitable for the fields of aerospace, automobile manufacturing and electronic industry. The method can effectively improve the plating quality of the complex workpiece, and has a wide application prospect.

This invention discloses a method, apparatus, platform, and storage medium for design optimization of liquid lithium-lead circuits under strong magnetic environment. The method includes: establishing a liquid lithium-lead circuit model, defining basic model parameters, operating boundary conditions, and temperature-dependent physical properties of liquid lithium-lead within the model; dividing the model into multiple computational units, and obtaining the local magnetic field vector at the spatial location of each computational unit based on the strong magnetic field environment parameters under tokamak device operating conditions; obtaining the strong magnetic field coupling calculation results of the liquid lithium-lead circuit model based on the local magnetic field vector at the spatial location of each computational unit; and modifying the model based on these results to output the final liquid lithium-lead circuit design result. This achieves magnetohydrodynamic and thermal-fluid coupling design of the liquid lithium-lead circuit, improving the reliability of the circuit design.

The invention relates to a line transient breakdown modeling method suitable for construction of a distribution network traveling wave detection environment. The line transient breakdown modeling method is used for solving the problem of transient fault modeling of experimental verification of a traveling wave distance measuring device at present. The method comprises the following steps: S1, constructing a black box Mayr model of an electric arc; considering that the diameter of the arc column is a constant value, the longer the distance between the section of the arc column and the circle center is, the lower the temperature is. S2, constructing a magnetohydrodynamic model; by means of a finite element method, grid division is conducted on the electric arc, solving is conducted through a multi-physical field coupling relation, and physical distribution characteristics in the electric arc are obtained; s3, constructing an instantaneous breakdown arc model; construction is carried out through a COMSOL system, the COMSOL system provides a geometric module, and drawing or structure size information of a line is utilized; s4, simulating to obtain instantaneous breakdown current and voltage waveform analysis; the metal shielding current is the arc current of the fault, and the wire core voltage is the arc voltage.

The invention belongs to the field of helium leakage detection, and particularly relates to a device for detecting helium leakage by using magnetic fluid, an outer ring wall and an inner ring wall are connected between a first ring structure and a second ring structure, and the outer ring wall is coaxially arranged outside the inner ring wall; the electromagnetic field generator is arranged in a first cavity between the outer ring wall and the inner ring wall; the magnetic induction sensor is arranged in the first cavity, or the electromagnetic field generator is arranged on the inner wall of the inner ring wall; when the device for detecting helium leakage through the magnetic fluid is arranged on a helium conveying pipeline, a second cavity formed by the inner ring wall, the helium conveying pipeline, the first annular structure and the second annular structure communicates with a storage cavity in the first annular structure through a first electromagnetic valve arranged on the first annular structure; the second cavity is communicated with a recovery cavity in the second annular structure through a second electromagnetic valve arranged on the second annular structure; the helium leakage detector can realize helium leakage detection in a non-vacuum environment, and has the advantages of being convenient to carry and reducing the helium detection difficulty and cost.

The invention provides a circuit breaker valve plate motion state detection method and device, equipment and a medium, and relates to the technical field of circuit breaker detection, and the method comprises the steps: determining position parameter thresholds of a valve plate at target moments under different on-off working conditions based on a magnetohydrodynamic simulation model of a target circuit breaker; determining a current target on-off working condition type of the target circuit breaker according to the real-time motion signal of the target circuit breaker; and analyzing according to the position parameter threshold value corresponding to the target on-off working condition type and the actual position of the target moment, and determining the real-time motion state of the circuit breaker valve plate. The current target on-off working condition type of a target circuit breaker is determined by acquiring a real-time motion signal of the target circuit breaker, so that the influence of the working environment where a valve plate is located is considered when the motion state of the valve plate is subsequently determined, and position parameter thresholds at target moments under different on-off working conditions are determined by using a magnetohydrodynamic simulation model; and the motion state of the valve plate is determined efficiently and accurately based on the actual position of the valve plate.

The present invention discloses a method and system for simulating the arc of a high-voltage circuit breaker based on type test data. The present invention includes taking the current value corresponding to the critical breaking interval data as the first boundary condition, and using a preset initial magnetohydrodynamic simulation model to perform arc simulation on the arcing process of the high-voltage circuit breaker; based on the preset zero-zone arc model, using the arc parameters of the arc simulation result as the initial condition to perform post-arc current calculation to determine the time series change of the post-arc current; comparing whether the time series change of the post-arc current is consistent with the preset time series change of the post-arc current, and determining the target magnetohydrodynamic simulation model of the high-voltage circuit breaker according to the comparison result. This solves the technical problem that the arcing experiment and circuit breaker structure used in the existing technology are relatively complex, resulting in inaccurate experimental observation data. The present invention combines the two simulation methods of type test and magnetohydrodynamic simulation model, which is simple, convenient and easy to implement, and the simulation results are both intuitive and accurate.

This invention provides a method and system for simulating and predicting lightning attachment on fan blades based on magnetohydrodynamics. The system includes the following steps: S1: constructing a mathematical model of the fan blade and establishing its two-dimensional geometric model; S2: placing a spherical discharge electrode on the two-dimensional fan blade model; S3: assigning electromagnetic and thermal material parameters to the two-dimensional fan blade model and the spherical discharge electrode; S4: applying a lightning current load to the spherical discharge electrode, grounding the central disk area of ​​the two-dimensional fan blade model; S5: encrypting the surface boundary area between the spherical discharge electrode and the fan blade; S6: simulating the lightning attachment process on the fan blade; S7: characterizing the starting position and spatial development trend of the lightning leader and the dynamic evolution of the discharge channel formation; and S8: determining the final lightning attachment location. This invention accurately predicts lightning attachment locations and reveals the lightning attachment mechanism and influencing factors, providing key technical support for lightning protection design and airworthiness compliance verification of aircraft engine fan blades.

The application relates to the technical field of non-electric quantity measurement testing, in particular to a magneto-hydrodynamic angular velocity sensor which comprises a cover plate, a shell and a base, wherein the shell is a cylindrical shell body, the inside of the shell body comprises a first cavity and a second cavity, the cover plate covers the upper end of the first cavity, and the base is fixed to the lower end of the second cavity; the inside of the first cavity is provided with an embedded circuit board and a connector, the embedded circuit board is connected with the outside through the connector and is used for outputting a signal to the outside; the inside of the second cavity is provided with a magnetic core assembly, the magnetic core assembly is connected with the embedded circuit board and is used for generating a current signal and transmitting the current signal to the embedded circuit board. The application has the characteristics of simple structure, convenient assembly, high measurement precision, wide frequency band, no mechanical saturation and high reliability, and is a key component for solving the problem of high-bandwidth micro-angle vibration measurement of a spacecraft.

The invention relates to an energy storage arrangement (1) with a redox energy storage device (7) comprising several redox flow cells (8) and connected via channel systems (4) to at least two electrolyte containers (3) in each of which an electrically conductive electrolyte (5) is stored, and an MHD module (10) comprising at least one evaluation and control unit (12) and at least two magnetohydrodynamic pump modules (20) for each of the individual redox flow cells (8), wherein the at least one evaluation and control unit (12) is configured to control the magnetohydrodynamic pump modules (20), wherein the magnetohydrodynamic pump modules (20) each comprise a magnet device and an electrode device, which is configured toto conduct an electric current provided by the at least one evaluation and control unit (12) through the corresponding electrically conductive electrolyte (5) in a channel section of a corresponding channel system (4), so that, in conjunction with a magnetic field generated by the magnetic device, a Lorentz force is created which selectively accelerates the electrically conductive electrolyte (5) in the corresponding channel section, so that a resulting pressure build-up causes a desired volume flow of the electrically conductive electrolyte (5) through the corresponding channel system (4) and the individual redox flow cells (8) of the redox energy storage device (7).

The present invention discloses a simulation method for three-dimensional full-space plasma response in EAST tokamak. In numerical simulation of plasma response in an EAST tokamak device, firstly, single frequency waves with different frequencies and amplitudes are selected according to experiment needs, to design waveforms of an external perturbation current field; then selected single frequency current field waveforms are respectively used as driving terms to solve magnetohydrodynamic equations containing an external driving current field to solve the distribution of the single frequency magnetic response signals in a three-dimensional full space; and finally, multiple groups of the single frequency magnetic response signals are superimposed and converted into a time domain space to obtain the three-dimensional full-space distribution of plasma magnetic response signals at any time. The present invention realizes the corresponding full-space distribution of plasma at any time in the process of simulating EAST tokamak discharge experiments, and makes up for the deficiency that the distribution of full-space magnetic signals cannot be obtained by experimental measurement. The present invention has accurate simulation results and strong practicality, and is a stable and efficient numerical simulation method.

The utility model discloses a high pressure resistant type precession vortex flowmeter which comprises a vortex flowmeter body, a pair of convex drainage tubes and a pressure intensity adjusting structure, the convex drainage tubes are installed on the two sides of the vortex flowmeter body respectively, and the pressure intensity adjusting structure is installed on the inner sides of the convex drainage tubes. The utility model relates to the technical field of vortex flow meters, firstly, a core buffer adjusting assembly of the vortex flow meter adopts a three-stage hydraulic expansion structure, the hydraulic energy conversion efficiency is enabled to break through 85% by utilizing the Laval nozzle effect, 0.1-1.5 MPa pressure intensity adjustment can be completed within 5ms, and the response speed is increased by three times compared with that of a traditional hydraulic adjusting system; and secondly, the buffer assembly creatively applies the magnetohydrodynamics principle, and by means of the coupling effect of a conical shunt block and an annular magnetic field, the cascade conversion of fluid kinetic energy is achieved while the shunt precision is kept to be + / -0.02 mm, and the eddy current inhibition efficiency reaches 92%.

This invention discloses a method and apparatus for solving three-dimensional nonlinear coupled angular spectral magnetohydrodynamics, relating to the fields of three-dimensional perturbation simulation of fusion plasma and angular spectral mode discretization. The method includes: acquiring the angular spectral modal states on a substrate computational grid; transforming the modal fluid flux and modal magnetic flux to an angular node space or weak integral sampling space satisfying dealiasing conditions; calculating the three-dimensional nonlinear fluid update quantity and magnetic update driving quantity; back-projecting the calculation results into retained modes, and forming an update of modes to be accepted. By coupling the calculation of nonlinear flux, non-ideal terms, or internal source terms in the sampling space and back-projecting to retain modes, non-axisymmetric three-dimensional perturbations can be expressed at a lower modal cost while maintaining modal magnetic confinement.

The invention discloses a manufacturing method of a magnetic field enhanced tungsten alloy sealing ring and the tungsten alloy sealing ring. The manufacturing method comprises the following steps that the tungsten alloy matrix meeting the size requirement is manufactured; the tungsten alloy matrix is pretreated; the cleaned tungsten alloy matrix is placed in a deposition chamber, and a first soft metal layer is deposited on the surface of the tungsten alloy matrix in the deposition chamber in a physical vapor deposition mode; after deposition of the first soft metal layer is completed, the tungsten alloy matrix is placed in a plating solution, a second soft metal layer is plated on the first soft metal layer in a chemical plating mode, and a high-intensity magnetic field with stable intensity is applied during chemical plating; and the second soft metal layer is cleaned after being machined, and the tungsten alloy sealing ring is obtained through drying after cleaning is completed. The magnetic fluid dynamic effect is generated by introducing an external magnetic field, the mass transfer process of metal ions in a plating solution to the surface of a workpiece is greatly enhanced, the chemical plating deposition rate is increased by 20-50%, the production period is remarkably shortened, and the cost is reduced.

The invention discloses an arc discharge simulation method and system under pivot rail contact and complete loss contact, and relates to the technical field of electromagnetic rail launching devices, and the method comprises the steps: constructing a multi-field coupled magnetohydrodynamic simulation model; under the development stages of different pivot rail contact states, the electric heating field coupling distribution condition of a pivot rail contact interface is analyzed; in the coexistence stage of the three contact states, the change rules of pivot rail contact interface parameters and arc discharge parameters under different metal liquefied layer thicknesses and armature empennage roughness are analyzed; and in a complete contact loss state of the pivot rail, obtaining a change rule of an arc form, an arc temperature and an arc energy flux density in a plasma gap along with emission time and a change rule of a pivot rail contact interface parameter and an arc discharge parameter under different numbers of pivot rail micro-contact points, pivot rail gap widths and rail surface roughness. And performing simulation analysis on the multi-physics field coupling distribution characteristics of the contact interface in different pivot rail contact state development stages.

The present invention refers to a device with diametral magnetic arrays for installations in magnetic SUBs, aiming the remediation and mitigation of inorganic and organic scales in production columns. The proposed magnetic device meets several specific criteria based on the magnetohydrodynamic model (MHD). After applying the said device with the proposed magnetic field, an efficiency of the scale inhibition was experimentally observed through laboratory tests, obtained from the values of the masses encrusted in the walls of the experimental bench system in the laboratory, with respect to the application without magnetic field. The device described herein can be installed in any pipeline used to transport fluids, including underwater pipelines for oil wells. These fluids can be oils, lubricants, gases, steams, water, petroleum or liquids in general.

This invention discloses a simulation method and system for arc discharge under pivot-rail contact and complete loss of contact conditions, relating to the field of electromagnetic orbital launch device technology. The method includes: constructing a multi-field coupled magnetohydrodynamic simulation model; analyzing the electrothermal field coupling distribution at the pivot-rail contact interface under different pivot-rail contact state development stages; analyzing the variation laws of pivot-rail contact interface parameters and arc discharge parameters under different metal liquefaction layer thicknesses and armature tail fin roughness under the coexistence of three contact states; obtaining the arc morphology and the variation laws of arc temperature and arc energy flux density in the plasma gap with launch time under the complete loss of pivot-rail contact state, as well as the variation laws of pivot-rail contact interface parameters and arc discharge parameters under different pivot-rail micro-contact point numbers, pivot-rail gap widths, and track surface roughness. The multi-physics field coupling distribution characteristics of the contact interface under different pivot-rail contact state development stages are simulated and analyzed.