38 results about "Magnetohydrodynamics" patented technology

The clutch of magnetohydrodynamics in centrifugal type is composed of input shaft, output shaft, magnetohydrodynamics, electromagnetic coil and clutching body, which consists of dish shell and sliding bock which can slide along radial direction under the action of centrifugal force to create effects of self-pressurizing for making shearing stress of magnetohydrodynamics a quite great increase. It has the characteristics of big driving torque and less power consumption comparing with the existing clutch of magnetohydrodynamics.

The invention relates to a parallel wire-array Z-pinch load which comprises an anode sleeve, a cathode sleeve, an anode plate, a cathode plate, a wire array, an insulating positioning sheet, two springs, two double-step positioning rods and two spring positioning rods, wherein the anode plate is fixed in the anode sleeve; the cathode plate is fixed in the cathode sleeve; and the wire array is arranged between the anode plate and the cathode plate. The invention solves the technical problem that the current column load is subjected to magneto fluid mechanics to cause instability in the pinch process to an axis, and the invention has the advantage that tight and uniformly distributed parallel wire-array Z-pinch load is provided in a pinch experiment.

A multi-stage solar concentrator (10) for use in a magnetohydrodynamic (MHD) electrical power generation system or process heating applications, said concentrator including a static planar solar collector (11), a paraboloidal mirror (12) receiving photons from the planar solar collector, and a compound parabolic solar concentrator (13) receiving photons from both said planar solar collector and said paraboloidal mirror. Suitably a solar oven (15) adapted for use in a fluid circuit of the MHD system or in process heating receives concentrated solar energy from the solar concentrator (10) via a transparent window (14).

The invention discloses a magnetohydrodynamic micropump which is small in size and can be integrated with a portable chip. The magnetohydrodynamic micropump comprises a substrate, wherein a flat type electromagnet is arranged on the lower surface of the substrate; a matrix is arranged on the upper surface of the substrate; the matrix is etched with a microchannel and a liquid storage tank which is communicated with the microchannel; electrodes are arranged on the two sides of the microchannel; the electrodes are sputtered on the upper surface of the matrix; the magnetohydrodynamic micropump further comprises a packaging layer for sealing the microchannel; a liquid injection hole and an electrode access hole are formed on the packaging layer. The flat type electromagnetic is used to generate magnetic field on the magnetohydrodynamic micropump, which substitutes the existing three-dimensional electromagnetic as a magnetic field source, so that the manufactured magnetohydrodynamic micropump is small in size, easy to be microminiaturized, and can be integrated with the portable chip. Furthermore, the flat type electromagnet is simpler to be processed, so that the processing and manufacturing cost of the magnetohydrodynamic micropump can be reduced. The magnetohydrodynamic micropump can be suitable for being promoted and applied in the non-mechanical type micropump field.

A magnetofluiddynamic (MFD) pump including a liquid (or partially liquid) piston and at least two valve-delimited chambers is disclosed. The valve-delimited chambers may be coupled, in series or parallel, between the input and the output of a fluid passage to provide either intermittent flow of the working fluid or substantially continuous working fluid flow. In at least one embodiment, a piston chamber housing a conductive liquid (e.g. liquid) piston is coupled to two valve-delimited chambers so that a single stroke of the piston both draws working fluid into one of the chambers and pushes working fluid out of the other chamber.

The invention relates to the field of lithium metal air batteries, in particular to a copper magnetic current collector, a preparation process thereof and a magnetic lithium air battery containing thesame. Surface modification is performed on a material with the permanent magnetic property to obtain a negative electrode material of a lithium air battery with large specific surface and high catalytic activity. According to the invention, the mass transfer process of oxygen is enhanced through the micro magnetic field, the concentration of active oxygen on the positive electrode surface is improved by the paramagnetic property of oxygen, the magnetohydrodynamics effect, the magnetization force effect and the like produce disturbance on the electrolyte, so that the reaction activity of the gas-liquid-solid three-phase interface is increased, the polarization is reduced, non-uniform deposition of the negative electrode metal lithium is improved, and the lithium dendrites are inhibited; the catalytic activity of the bifunctional catalyst is increased and the over-potential is reduced by the electric field generated by the copper layer structure; by the structure field energy, the volume change stress is released, the expansion space is provided, a uniform reaction active site and the like are provided, and the overall electrochemical performance is fully improved.

The invention relates to the technical field of aluminum alloy laser welding, and discloses an electromagnetic auxiliary laser welding method for pre-arranged powder on the surface of an aluminum alloy. According to the method, alloy powder is pre-arranged at the butt joint of an aluminum alloy flat plate, meanwhile, an electromagnetic field is additionally arranged to assist laser welding, and the method aims to improve the laser welding quality of the aluminum alloy. Compared with the prior art, the method has the advantages that the problem that the pore defect is prone to being generated due to the fact that powder is pre-arranged through a chemical bonding method is solved; meanwhile, based on the magnetohydrodynamic principle, the electromagnetic field is additionally arranged to change the flow of a molten pool, the magnetic stirring effect is generated on liquid metal, crystal grains are refined, and the weld joint structure is improved; and in the laser welding process, a transverse magnetic field generation device can generate a steady-state magnetic field at the molten pool, the steady-state magnetic field is coupled with an electric field generated by a direct-current power supply, the molten pool is subjected to stable electromagnetic force, so that the weld joint is effectively prevented from collapsing, the mechanical property of a joint is improved, and therefore the reliability of an aluminum alloy welding structural part for aviation is improved.

The invention provides an aviation arc fault damage simulation method based on Fluent software, and the method comprises the steps: introducing a magnetohydrodynamic model on the basis of an incompressible flow K-epsilon turbulence model based on Fluent, importing a change relation between plasma physical parameters and temperature into a Fluent solver through a user-defined function, and carrying out the calculation of the change relation between the plasma physical parameters and the temperature. And the simulation calculation of the electric arc in Fluent can be realized. The method has the beneficial effects that the electric arc is simulated after parameters are initialized, the change of the electric characteristic and the temperature field characteristic of the electric arc along with time is obtained, and the damage volume of the surrounding parts after the electric arc is generated can be extracted through a calculation result due to the fact that energy generated after the electric arc is generated can damage the surrounding parts.

The invention discloses a device and a method for testing the performance of a magnetohydrodynamic inertia momentum wheel, and the method comprises the steps: enabling the magnetohydrodynamic inertiamomentum wheel which is pre-machined and assembled to be installed on an air-floating turntable with a photoelectric encoder, giving a test control signal through a data collection card through an upper computer, under the excitation of a power amplification drive circuit, synchronously collecting the input driving current of the magnetohydrodynamic inertia momentum wheel and the rotating speed ofthe air floatation turntable, and calculating to obtain the average flow velocity, the output torque and the angular momentum of the conductive fluid according to the rotating speed of the air floatation turntable, the rotating inertia of the air floatation turntable, the rotating inertia of a conductive fluid ring and the input driving current and a formula provided based on the angular momentumconservation principle and the working principle of the magnetohydrodynamic inertia momentum wheel. According to the invention, the actuating principle of the magnetohydrodynamic inertia momentum wheel can be indirectly verified, the output torque and angular momentum performance characteristics of the magnetohydrodynamic inertia momentum wheel are tested, and the blank in the field of magnetohydrodynamic inertia momentum wheel test experiment research is filled.

The invention relates to a flow velocity coding method, a magnetic resonance imaging method and a magnetic resonance imaging system. The method comprises the following steps: obtaining a first electrocardiogram signal curve of a subject from the outside of an imaging view field, and obtaining a second electrocardiogram signal curve of the subject from the inside of the imaging view field; determining a magnetohydrodynamic effect curve according to the first electrocardiogram signal curve and the second electrocardiogram signal curve; determining a blood flow estimation speed curve of the subject according to the magnetohydrodynamic effect curve; according to the blood flow estimation speed curve, determining a flow rate coding parameter of each scanning period phase; and according to the corresponding flow rate coding parameters, carrying out flow rate coding on each scanning period phase. According to the invention, the problem of large flow velocity measurement error caused by fixed flow velocity coding is solved, and the flow velocity measurement error is reduced.

The invention discloses a magnetofluid mold pouring intelligent cloud control system which is characterized in that liquid is subjected to heat preservation in a heat preservation furnace at a presettemperature, and the liquid in the heat preservation furnace is pumped into a mold through an electromagnetic pump; a liquid level rising process model is constructed, and a relation model of the current and the liquid level height is formed by utilizing the correlation of the liquid level height, the mold and the current; and the current is controlled based on the model content to realize accurate control of the pouring amount. In the embodiment of the invention, by starting from a magnetohydrodynamics equation, a static model and a dynamic model are designed, and calculation is carried out through existing physical quantities such as current which can be accurately measured, so that the pouring progress is reversely controlled in real time by utilizing a controllable factor, namely current, in the pouring process.

The invention belongs to the technical field of electric energy extraction in the magnetohydrodynamic technology, and particularly relates to an electric energy extraction device in the magnetohydrodynamic technology. The magnetic fluid circulation channel is arranged in the magnetic field generated by the magnetic pole, two opposite electric energy extraction holes are formed in the side wall of the magnetic fluid circulation channel, an annular cooling cavity is formed in the side wall, and a cooling inlet and a cooling outlet communicated with the annular cooling cavity are formed in the outer wall surface; and a pair of electrodes, wherein each electrode is correspondingly inserted into one electric energy extraction hole.