A magnetized plasma jet generating device and method

Abstract

This invention relates to the field of magnetic inertial confinement fusion technology, and more particularly to a magnetized plasma jet generator, comprising: an electrode assembly with an annular cavity formed therein; a bias field assembly for forming a bias magnetic field within the annular cavity; a gas valve inlet assembly for injecting gas into the annular cavity; and a main capacitor transmission assembly coaxially disposed below the electrode assembly and providing a pre-ionization voltage and instantaneous current to the electrode assembly. The invention also relates to a method for generating a magnetized plasma jet using this device, wherein the main capacitor transmission assembly first provides a pre-ionization voltage to the electrode assembly, the bias field assembly forms a bias magnetic field within the annular cavity of the electrode assembly, and then the gas valve inlet assembly injects a required mass of gas into the lower end of the annular cavity. The gas is pre-ionized under the pre-ionization voltage to form initial plasma, and then the main capacitor transmission assembly provides an instantaneous current to the electrode assembly. This method can generate high-density plasma with high magnetic Reynolds number, high β value, and coaxial helical injection movement.

Description

Technical Field

[0001] This invention relates to the field of magnetic inertial confinement fusion technology, and more particularly to a magnetized plasma jet generator and a method for generating magnetized plasma jets. Background Technology

[0002] The formation of magnetized plasma targets is one of the two key technologies of PJMIF (Plasma Jet Driven Magnetoresistive Inertial Confinement Fusion). The magnetized plasma jet generator, used to generate the plasma jet, is the most important device in the magnetized plasma target formation system. Two sets of magnetized plasma jet generators are symmetrically distributed at the two stages of the PJMIF device. These two sets of generators simultaneously emit a single plasma stream, which converges and compresses to form half of the magnetized target. This half then collides at the center of the PJMIF device to form the target magnetized plasma target.

[0003] Research aimed at achieving MIF (magnetic inertial confinement fusion) using a high-impulse-velocity (greater than 50 km / s) plasma bushing to compress a magnetized plasma target requires plasma with high magnetic Reynolds number, high β value, and high density. Therefore, improving the density and magnetic field strength of the magnetized plasma generated by the magnetized plasma jet generator is a pressing issue that needs to be addressed. Summary of the Invention

[0004] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a magnetized plasma jet generating device and method that can generate high-density plasma with high magnetic Reynolds number, high β value, and coaxial helical injection movement.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] This invention provides a magnetized plasma jet generator, comprising: an electrode assembly having an annular cavity formed inside, closed at the lower end and open at the upper end; a bias field assembly disposed outside the annular cavity, the bias field assembly being used to form a bias magnetic field within the annular cavity; a gas valve inlet assembly disposed below the electrode assembly, the gas valve inlet assembly being used to inject gas into the annular cavity from the lower end of the annular cavity; and a main capacitor transmission assembly coaxially disposed below the electrode assembly and connected to the electrode assembly, the main capacitor transmission assembly providing a pre-ionization voltage and a transient current to the electrode assembly.

[0007] Preferably, the annular cavity includes a conical cavity, a magnetizing cavity, and an expansion cavity connected sequentially from bottom to top. The diameter of the conical cavity gradually decreases from bottom to top, and the radial inner and outer outer walls of the conical cavity are both curved surfaces. The diameter of the magnetizing cavity is smaller than the diameter of the expansion cavity. The bias field component generates a bias magnetic field on the outer periphery of the magnetizing cavity into the magnetizing cavity.

[0008] Preferably, the electrode assembly includes an outer electrode and an inner electrode, with the outer electrode sleeved over the inner electrode to form an annular cavity between them, and an inter-electrode insulating pad that seals the lower end of the annular cavity is provided between the lower end of the outer electrode and the lower end of the inner electrode.

[0009] Preferably, the main capacitor transmission assembly includes a main capacitor, with two electrodes of the main capacitor connected to a low-voltage electrode plate and a high-voltage electrode plate, respectively. The low-voltage electrode plate is connected to an outer electrode via an outer current transmission plate, and the high-voltage electrode plate is connected to an inner electrode via an inner current transmission plate. A switch and a current-limiting resistor and an inductor connected in parallel with the switch are provided between the high-voltage electrode plate and the inner current transmission plate.

[0010] Preferably, the switch is a spark gap switch.

[0011] Preferably, the bias field assembly includes a bias field coil, which is connected to a bias field capacitor via a bias field thyristor. The electrode assembly has a slit that passes through the annular cavity, and the bias field coil is wound around the electrode assembly and covers the slit.

[0012] Preferably, the bias field assembly further includes a diode connected in parallel with the bias field capacitor.

[0013] Preferably, the lower end of the electrode assembly has an air inlet that communicates with the lower end of the annular cavity. The air valve inlet assembly includes an outer liner, an inner liner, a flying disc, a spring, an air valve coil, and an air inlet pipe. The upper end of the outer liner is recessed downward to form a concave cavity. An air hole is provided on the side wall of the concave cavity, and the air hole connects the concave cavity and the air inlet. The inner liner is fixedly fitted inside the concave cavity. The flying disc is movably fitted inside the concave cavity. The flying disc is located on the upper end surface of the inner liner and forms an air storage chamber between the flying disc and the inner liner. A window is provided on the flying disc. When the flying disc is in contact with the upper surface of the inner liner, the window is located below the air hole. When the flying disc rises and the window passes through the air hole, the window connects the air storage chamber and the air hole. The spring applies a downward preload force to the flying disc, so that the flying disc is in contact with the upper surface of the inner liner. The air valve coil is located between the inner liner and the outer liner and is located on the side of the inner liner away from the flying disc. The air valve coil is connected to the air valve capacitor through the air valve thyristor. The air inlet pipe is connected to the air storage chamber and is used to evacuate the air storage chamber and to input gas into the air storage chamber.

[0014] Preferably, the lower outer peripheral surface of the liner fits against the side wall of the cavity, and the upper outer peripheral surface forms an outer annular groove with a gap between it and the side wall of the cavity. An inner annular groove is formed on the upper surface of the liner along the circumferential direction. The outer periphery of the flying disc is bent downward to form an outer wing that is inserted and matched with the outer annular groove. A window is opened on the outer wing. An annular inner wing extends downward on the lower surface of the flying disc. The inner wing is inserted into the inner annular groove and forms an air storage chamber with a gap between it and the outer peripheral side wall of the inner annular groove.

[0015] The present invention also provides a method for generating a magnetized plasma jet, which uses the magnetized plasma jet generating device described above. First, the main capacitor transmission component provides a pre-ionization voltage to the electrode assembly. The bias field component forms a bias magnetic field in the annular cavity of the electrode assembly. Then, the gas valve inlet component injects the required mass of gas into the annular cavity from the lower end of the annular cavity. The injected gas is pre-ionized under the action of the pre-ionization voltage to form an initial plasma. Finally, the main capacitor transmission component provides an instantaneous current to the electrode assembly.

[0016] Compared with the prior art, the present invention has significant progress:

[0017] This invention provides a pre-ionization voltage to the electrode assembly via a main capacitor transmission component and forms a bias magnetic field within the annular cavity of the electrode assembly via a bias field component. During launch, a required mass of gas is injected into the annular cavity from its lower end via a gas valve inlet component. This gas is pre-ionized by the pre-ionization voltage provided by the main capacitor transmission component, forming an initial plasma that flows towards the upper end of the annular cavity. Subsequently, an instantaneous current is provided to the electrode assembly via the main capacitor transmission component. This instantaneous high current applied to the electrode assembly forms a supersonic, super-Alfvén velocity plasma plate at the bottom of the pre-ionized gas within the annular cavity, compressing the preceding pre-ionized gas and accelerating it to a magnetic Reynolds number greater than 10 under the influence of the Lorentz force, thereby effectively freezing the magnetic flux within the plasma. As the plasma leaves the upper end of the annular cavity of the electrode assembly, the magnetic field lines within the plasma are reconnected, forming a ring-shaped magnetized plasma cluster with a certain magnetic helicity. This allows for the injection of a helical magnetic field into a compact, dense toroidal plasma. At similar velocities (>100 km / s), the density of magnetized plasma produced by this method is increased by two orders of magnitude, and the magnetic field strength is increased by one order of magnitude (β>1). This enables the emission of high-density plasma with high magnetic Reynolds numbers, high β values, and coaxial helical injection. Furthermore, the use of a coaxial main capacitor transmission assembly reduces the total inductance and improves emission efficiency. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the magnetized plasma jet generator according to an embodiment of the present invention.

[0019] Figure 2 This is a bottom view schematic diagram of the magnetized plasma jet generator according to an embodiment of the present invention.

[0020] Figure 3 This is a longitudinal cross-sectional schematic diagram of the magnetized plasma jet generator according to an embodiment of the present invention.

[0021] Figure 4 This is a longitudinal cross-sectional schematic diagram of the electrode assembly in the magnetized plasma jet generator according to an embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the internal electrode structure in the magnetized plasma jet generator according to an embodiment of the present invention.

[0023] Figure 6 This is a circuit diagram of the bias field component in the magnetized plasma jet generator according to an embodiment of the present invention.

[0024] Figure 7 This is a longitudinal cross-sectional view of the switch assembly of the main capacitor transmission component in the magnetized plasma jet generator according to an embodiment of the present invention.

[0025] Figure 8 This is a longitudinal cross-sectional schematic diagram of the assembly of the gas valve inlet assembly and the electrode assembly in the magnetized plasma jet generator according to an embodiment of the present invention.

[0026] Figure 9 yes Figure 8 Enlarged schematic diagram of section A with the air valve intake assembly in the open state.

[0027] Figure 10 This is a longitudinal sectional view of the assembly of the outer liner, inner liner, flying disc, valve coil, and intake pipe of the air valve intake component in the magnetized plasma jet generator of this invention.

[0028] Figure 11 This is a three-dimensional structural diagram of the air valve inlet assembly in the magnetized plasma jet generator according to an embodiment of the present invention.

[0029] Figure 12 This is a schematic diagram of the upper part of the disc of the air valve intake assembly in the magnetized plasma jet generator according to an embodiment of the present invention.

[0030] Figure 13 This is a schematic diagram of the lower part of the disc of the air valve intake assembly in the magnetized plasma jet generator according to an embodiment of the present invention.

[0031] The reference numerals in the attached figures are explained as follows:

[0032] 1 Electrode assembly 28 Second bias field distribution plate 41 Main capacitor

[0033] 10 Annular cavity 29 Bias field insulating pad 42 Main capacitor low-voltage electrode plate

[0034] 100 Air inlet 3 Air valve intake assembly 43 Main capacitor high voltage electrode plate

[0035] 101 Conical cavity 31 Outer liner 44 Main capacitor insulating pad

[0036] 102 Magnetization cavity 310 Concave cavity 45 Outer current transmission plate

[0037] 103 Expansion chamber 311 Air vent 451 First coaxial outer transmission plate

[0038] 11 External electrode 312 Slide groove 452 Parallel outer transmission plate

[0039] 111 External electrode air inlet section 313 Connecting flange 453 Second coaxial outer transmission plate

[0040] 112 External electrode modulation section 32 Inner liner 46 Inner current transmission plate

[0041] 113 External electrode magnetization section 321 Outer annular groove 461 First coaxial inner transmission plate

[0042] 114 External electrode expansion section 322 Inner annular groove 462 Parallel inner transmission plate

[0043] 12 Inner electrode 323 Receiving cavity 463 Second coaxial inner transmission plate

[0044] 121 Internal electrode air intake section 33 Flying disc 47 Switch

[0045] 122 Internal electrode acceleration section 330 Window 471 High voltage electrode connection plate

[0046] 123 Compartmental space 331 Outer wing 472 Tipped electrode

[0047] 124 Blind hole 332 Inner wing 473 Trigger electrode

[0048] 13 Electrode insulating pad 333 Boss 474 Gas chamber

[0049] 14 Slit 34 Gas storage chamber 475 Low-pressure electrode connection plate

[0050] 2. Bias field assembly 35. Spring 476. Flat electrode

[0051] 21 Bias field coil; 36 Air valve coil; 481 Current limiting resistor

[0052] 22 Biased Field Thyristor; 361 Pneumatic Valve Thyristor; 482 Inductor

[0053] 23 Bias field capacitor; 362 Gas valve capacitor; 49 Transmission board insulating pad.

[0054] 24 Diode 37 Inlet pipe 40 Connecting plate

[0055] 25 Ceramic inserts; 38 Sealing rings; 5 Housings

[0056] 26 Insulating Bushing 39 O-ring 51 Vacuum Through Flange

[0057] 27 First bias field uniform distribution plate 4 main capacitor transmission assembly Detailed Implementation

[0058] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0059] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0060] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0061] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0062] like Figures 1 to 13 The image shows an embodiment of the magnetized plasma jet generator provided by this invention. This embodiment of the magnetized plasma jet generator is applied to a magnetized plasma target formation system for magnetic inertial confinement fusion. In application, two sets of magnetized plasma jet generators are symmetrically distributed at the two poles of a plasma jet-driven magnetic inertial confinement fusion device. These two sets of magnetized plasma jet generators simultaneously emit a set of plasmas with high magnetic Reynolds numbers, high β values, and coaxial helical injection. These two sets of plasmas converge and compress to form half of the magnetized target, colliding at the center of the plasma jet-driven magnetic inertial confinement fusion device to form a target with a density greater than 10. 22 / m 3 A magnetized plasma target with β>10.

[0063] See Figures 1 to 3 The magnetized plasma jet generator of this embodiment includes an electrode assembly 1, a bias field assembly 2, a gas valve inlet assembly 3, and a main capacitor transmission assembly 4. An annular cavity 10 is formed inside the electrode assembly 1, with its lower end closed and its upper end open. The annular cavity 10 is used to inject gas, which, under the influence of voltage, current, and a magnetic field, forms plasma and is then ejected from the upper end of the annular cavity 10. The bias field assembly 2 is located outside the annular cavity 10 and is used to create a bias magnetic field within the annular cavity 10. The gas valve inlet assembly 3 is located at the lower part of the electrode assembly 1 and is used to inject gas into the annular cavity 10 from its lower end. The main capacitor transmission assembly 4 is coaxially located below the electrode assembly 1 and connected to it, providing the electrode assembly 1 with a pre-ionization voltage and a transient current.

[0064] In the initial state of preparing to launch, the magnetized plasma jet generator of this embodiment has the bias field assembly 2 and the main capacitor transmission assembly 4 fully charged, the gas valve inlet assembly 3 storing gas at a certain pressure, the main capacitor transmission assembly 4 providing a pre-ionization voltage to the electrode assembly 1, the bias field assembly 2 opening and forming a bias magnetic field in the annular cavity 10 of the electrode assembly 1, which fills the annular cavity 10. During launch, the gas inlet assembly 3 opens and injects the required mass of gas into the annular cavity 10 from the lower end of the annular cavity 10 of the electrode assembly 1. The gas injected into the annular cavity 10 is pre-ionized by the pre-ionization voltage provided by the main capacitor transmission assembly 4 to form an initial plasma that flows towards the upper end of the annular cavity 10. Then, the main capacitor transmission assembly 4 provides an instantaneous current to the electrode assembly 1. The instantaneous large current applied to the electrode assembly 1 forms a supersonic, super-Alfvén velocity plasma plate at the bottom of the pre-ionized gas in the annular cavity 10, compressing the pre-ionized gas in front and accelerating it to a magnetic Reynolds number greater than 10 under the impetus of the Lorentz force, thereby effectively freezing the magnetic flux in the plasma. When the plasma leaves the upper end of the annular cavity 10 of the electrode assembly 1, the magnetic field lines inside the plasma are reconnected to form a ring-shaped magnetized plasma cluster with a certain magnetic helicity. Therefore, a helical magnetic field can be injected into a compact and dense toroidal plasma. At similar speeds (>100 km / s), the density of the magnetized plasma produced by this device is increased by two orders of magnitude, and the magnetic field strength is increased by one order of magnitude (β>1). This enables the emission of high-density plasma with high magnetic Reynolds numbers, high β values, and coaxial helical injection. Furthermore, the use of a coaxial main capacitor transmission component 4 reduces the total inductance and improves emission efficiency.

[0065] See Figure 3 , Figure 4 and Figure 5In this embodiment, preferably, the annular cavity 10 of the electrode assembly 1 includes a conical cavity 101, a magnetization cavity 102, and an expansion cavity 103, which are sequentially connected and coaxially arranged from bottom to top. The diameter of the conical cavity 101 gradually decreases from bottom to top, and both the radial inner wall and the radial outer wall of the conical cavity 101 are curved surfaces. The diameter of the magnetization cavity 102 is equal to the minimum diameter of the conical cavity 101, and the diameter of the magnetization cavity 102 is smaller than the diameter of the expansion cavity 103. The bias field assembly 2 generates a bias magnetic field on the outer periphery of the magnetization cavity 102 and then diffuses into the magnetization cavity 102. The bias magnetic field injected by the magnetization cavity 102 diffuses into the conical cavity 101 and the expansion cavity 103 and fills the annular cavity 10. Gas injected into the annular cavity 10 from the lower end of the annular cavity 10 is pre-ionized to form an initial plasma, which flows along the contracting conical cavity 101 to the magnetization cavity 102, and then enters the expansion cavity 103. The contracting curved surface design of the conical cavity 101 has a density modulation function, which can make the plasma density higher and the plasma emission velocity higher (>100km / s), thereby helping to obtain high magnetic Reynolds number plasma.

[0066] In this embodiment, preferably, the electrode assembly 1 includes an outer electrode 11 and an inner electrode 12. The outer electrode 11 is axially oriented and extends vertically. The outer electrode 11 is sleeved over the inner electrode 12 and forms an annular cavity 10 between the outer electrode 11 and the inner electrode 12. An inter-electrode insulating pad 13 is provided between the lower end of the outer electrode 11 and the lower end of the inner electrode 12 to close the lower end of the annular cavity 10. The inter-electrode insulating pad 13 is preferably an alumina ceramic insulating pad.

[0067] Preferably, the outer electrode 11 includes an outer electrode air inlet section 111, an outer electrode modulation section 112, an outer electrode magnetization section 113, and an outer electrode expansion section 114 connected sequentially from bottom to top. The inner electrode 12 includes an inner electrode air inlet section 121 and an inner electrode acceleration section 122 connected sequentially from bottom to top. The lower ends of both the outer electrode air inlet section 111 and the inner electrode air inlet section 121 are horizontal flanges. An inter-electrode insulating pad 13 is horizontally sandwiched between the lower ends of the outer electrode air inlet section 111 and the inner electrode air inlet section 121, and the three are connected and fixed by bolts. The upper ends of the outer electrode air inlet section 111 and the outer electrode modulation section 112 extend in a contracting curved surface, forming the outer peripheral sidewall of the conical cavity 101 in the annular cavity 10. The upper end of the inner electrode air inlet section 121 extends in a contracting curved surface, forming the inner peripheral sidewall of the conical cavity 101. The outer electrode magnetization section 113, the outer electrode expansion section 114, and the inner electrode acceleration section 122 all extend vertically upwards. A magnetization cavity 102 is formed between the lower ends of the outer electrode magnetization section 113 and the inner electrode acceleration section 122 within the annular cavity 10. The inner diameter of the outer electrode expansion section 114 is larger than the inner diameter of the outer electrode magnetization section 113, and an expansion cavity 103 is formed between the upper ends of the outer electrode expansion section 114 and the inner electrode acceleration section 122 within the annular cavity 10.

[0068] In this embodiment, the lower end of the electrode assembly 1 is provided with an air inlet 100 communicating with the lower end of the annular cavity 10, for introducing gas into the annular cavity 10. Preferably, the air inlet 100 is provided on the inner electrode air inlet section 121 of the inner electrode 12 near the lower end of the annular cavity 10, and a plurality of air inlets 100 are evenly distributed circumferentially on the inner electrode air inlet section 121 of the inner electrode 12 to uniformly inject gas into the annular cavity 10. On the lower end face of the electrode assembly 1, that is, on the lower end face of the inner electrode air inlet section 121 of the inner electrode 12, there is a accommodating space 123 for assembling the air valve air inlet assembly 3. The air inlet 100 communicates with the accommodating space 123 to cooperate with the air valve air inlet assembly 3 to achieve air intake. The air inlet 100 is preferably a tapered hole with a diameter that gradually increases along the direction close to the interior of the annular cavity 10.

[0069] See Figure 1 and Figure 3 In this embodiment, preferably, a housing 5 is sleeved on the outer periphery of the electrode assembly 1, the lower end of the housing 5 is sealed and fixed to the lower end of the electrode assembly 1, and a vacuum through flange 51 is provided at the upper end of the housing 5. The vacuum through flange 51 is used to seal and fix to the plasma jet driven magnetic inertial confinement fusion device, so as to install the magnetized plasma jet generator of this embodiment onto the plasma jet driven magnetic inertial confinement fusion device and surround the electrode assembly 1 in a vacuum environment.

[0070] See Figure 1 and Figure 3In this embodiment, preferably, the bias field assembly 2 includes a bias field coil 21, which is connected to a bias field capacitor 23 via a bias field thyristor 22. When the bias field thyristor 22 is turned on, the charged bias field capacitor 23 discharges, providing current to the bias field coil 21 and exciting it to generate a strong bias magnetic field. A slit 14 penetrating the annular cavity 10 is provided on the electrode assembly 1. The bias field coil 21 is wound around the electrode assembly 1 and covers the slit 14. A ceramic insert 25 is provided on the cavity wall of the annular cavity 10, and the ceramic insert 25 is embedded in the outer peripheral sidewall of the annular cavity 10 at a position corresponding to the bias field coil 21. Preferably, the slit 14 is formed on the outer electrode magnetization section 113 of the outer electrode 11. The slit 14 is a long and narrow slit extending along the axial direction of the outer electrode magnetization section 113. Preferably, there are multiple slits 14, which are evenly spaced along the circumference of the outer electrode magnetization section 113. The ceramic insert 25 is embedded in the inner circumferential surface of the outer electrode magnetization section 113. The bias field coil 21 is wound around the outer circumferential surface of the outer electrode magnetization section 113 and covers all the slits 14. Furthermore, an insulating bushing 26 is provided between the bias field coil 21 and the outer electrode magnetization section 113. The insulating bushing 26 is preferably an alumina ceramic bushing. The strong bias magnetic field generated by the bias field coil 21 diffuses through the slit 14 into the magnetized cavity 102 in the annular cavity 10, and then diffuses into the conical cavity 101 and the expansion cavity 103, generating an axial magnetic field within the annular cavity 10. As it diffuses into the expansion cavity 103, it diffuses radially outward, generating a radial component, thereby injecting a radial magnetic field into the plasma reaching the expansion cavity 103. When the plasma with a high magnetic Reynolds number (greater than 10) passes through the magnetic field within the annular cavity 10, the magnetic flux is frozen within the plasma. After the plasma leaves the upper end of the annular cavity 10, the magnetic field lines inside the plasma reconnect, forming a high-β-value annular plasma cluster with a certain magnetic helicity.

[0071] Furthermore, the bias field component 2 also includes a diode 24, which is connected in parallel with the bias field capacitor 23. The diode 24 can extend the duration of the bias magnetic field generated by the bias field coil 21 excited by the instantaneous current of the bias field capacitor 23.

[0072] In this embodiment, multiple bias field capacitors 23 are provided, and the multiple bias field capacitors 23 are distributed in a circle along the outer periphery of the lower end of the electrode assembly 1 to form a bias field capacitor group. One electrode of each bias field capacitor 23 is connected to the first bias field uniform distribution plate 27, and the other electrode of each bias field capacitor 23 is connected to the second bias field uniform distribution plate 28. The first bias field uniform distribution plate 27 and the second bias field uniform distribution plate 28, and the second bias field uniform distribution plate 28 and the electrode assembly 1 are separated by bias field insulating pads 29, which are preferably silicone insulating pads. One electrode of the bias field coil 21 is connected to one end of the bias field thyristor 22, and the other end of the bias field thyristor 22 is connected to the first bias field distribution plate 27. The first bias field distribution plate 27 is connected to one electrode of each bias field capacitor 23, and the other electrode of each bias field capacitor 23 is connected to the second bias field distribution plate 28. The second bias field distribution plate 28 is connected to the other electrode of the bias field coil 21, thus forming a connection circuit of the bias field coil 21, the bias field thyristor 22, and the bias field capacitor bank. One end of the diode 24 is connected to the first bias field distribution plate 27, and the first bias field distribution plate 27 is connected to one electrode of each bias field capacitor 23. The other electrode of each bias field capacitor 23 is connected to the second bias field distribution plate 28, and the second bias field distribution plate 28 is connected to the other end of the diode 24, thus forming a connection circuit of the diode 24 and the bias field capacitor bank.

[0073] See Figure 1 and Figure 3 In this embodiment, preferably, the main capacitor transmission assembly 4 includes a main capacitor 41. The two electrodes of the main capacitor 41 are respectively connected to the main capacitor low-voltage electrode plate 42 and the main capacitor high-voltage electrode plate 43. The main capacitor low-voltage electrode plate 42 and the main capacitor high-voltage electrode plate 43 are separated by a main capacitor insulating pad 44, which is preferably a silicone insulating pad. The main capacitor low-voltage electrode plate 42 is connected to the outer electrode 11 of the electrode assembly 1 through an outer current transmission plate 45. The main capacitor high-voltage electrode plate 43 is connected to the inner electrode 12 of the electrode assembly 1 through an inner current transmission plate 46. A switch 47 and a current-limiting resistor 481 and an inductor 482 connected in parallel with the switch 47 are provided between the main capacitor high-voltage electrode plate 43 and the inner current transmission plate 46. The outer current transmission plate 45 and the inner current transmission plate 46 are separated by a transmission plate insulating pad 49. When switch 47 is open, the voltage of the charged main capacitor 41 is applied to the outer electrode 11 and inner electrode 12 of the electrode assembly 1 through the current-limiting resistor 481 and the inductor 482, thereby providing a voltage to pre-ionize the gas to the electrode assembly 1 before the main discharge of the main capacitor 41 is initiated. When switch 47 is turned on, the main capacitor 41 initiates the main discharge, providing a momentary current to the electrode assembly 1.

[0074] In this embodiment, multiple main capacitors 41 are provided, and the multiple main capacitors 41 are arranged in a circle circumferentially below the electrode assembly 1 and coaxial with the electrode assembly 1, forming a main capacitor group. The two electrodes of each main capacitor 41 are located at the lower end of the main capacitor 41 and are respectively connected to the low-voltage electrode plate 42 and the high-voltage electrode plate 43 of the main capacitor. The low-voltage electrode plate 42 and the high-voltage electrode plate 43 are both connected in parallel to the lower end of the main capacitor group. The high-voltage electrode plate 43 is located below the low-voltage electrode plate 42, and the switch 47 is located below the high-voltage electrode plate 43. The switch 47 is connected to the inner current transmission plate 46 through a connecting plate 40 with a live contactor. The outer current transmission plate 45 and the inner current transmission plate 46 are both arranged in a ring coaxial with the electrode assembly 1. The outer current transmission plate 45 includes a first coaxial outer transmission plate 451 extending vertically upward from the outer periphery of the low-voltage electrode plate 42 of the main capacitor bank to the upper end of the main capacitor bank, a parallel outer transmission plate 452 extending horizontally radially inward from the upper end of the first coaxial outer transmission plate 451, and a second coaxial outer transmission plate 453 extending vertically upward from the radially inner edge of the parallel outer transmission plate 452 to the lower end of the outer electrode 11 of the electrode assembly 1. The inner current transmission plate 46 includes a first coaxial inner transmission plate 461 extending vertically upward from the outer periphery of the connecting plate 40 to the upper end of the main capacitor bank, a parallel inner transmission plate 462 extending horizontally radially inward from the upper end of the first coaxial inner transmission plate 461, and a second coaxial inner transmission plate 463 extending vertically upward from the radially inner edge of the parallel inner transmission plate 462 to the lower end of the inner electrode 12 of the electrode assembly 1. The inner current transmission plate 46 is located on the inner periphery of the outer current transmission plate 45. A clearance hole is provided on the outer periphery of the main capacitor low-voltage electrode plate 42 for the first coaxial inner transmission plate 461 to pass through. Transmission plate insulating pads 49 are provided between the first coaxial outer transmission plate 451 and the first coaxial inner transmission plate 461, between the parallel outer transmission plate 452 and the parallel inner transmission plate 462, and between the second coaxial outer transmission plate 453 and the second coaxial inner transmission plate 463. The upper ends of the second coaxial outer transmission plate 453 and the second coaxial inner transmission plate 463 are respectively connected to the lower outer periphery of the outer electrode air inlet section 111 and the lower outer periphery of the inner electrode air inlet section 121. A bias field capacitor bank composed of multiple bias field capacitors 23 is arranged above the parallel outer transmission plate 452 and located on the outer periphery of the second coaxial outer transmission plate 453. The internal space of the second coaxial inner transmission plate 463 accommodates the air valve intake assembly 3 assembled in the accommodating space 123 on the lower end face of the inner electrode 12 of the electrode assembly 1.

[0075] In this embodiment, preferably, switch 47 is a spark gap switch. Figure 7Preferably, the spark gap switch 47 includes a high-voltage electrode connecting plate 471, a pointed electrode 472, a trigger electrode 473, a gas chamber 474, a low-voltage electrode connecting plate 475, and a flat electrode 476. The high-voltage electrode connecting plate 471 is horizontally connected to the lower surface of the main capacitor high-voltage electrode plate 43. The low-voltage electrode connecting plate 475 is parallel to and opposite to the high-voltage electrode connecting plate 471, and is connected to the connecting plate 40. This allows the main capacitor high-voltage electrode plate 43 to be connected to the inner current transmission plate 46 via the switch 47 and the connecting plate 40. The gas chamber 474 is located between the high-voltage electrode connecting plate 471 and the low-voltage electrode connecting plate 475, and is hollow inside to form a gas cavity. The pointed electrode 472 is located on the high-voltage electrode connecting plate 471, and the lower end of the pointed electrode 472 is located inside the gas cavity of the gas chamber 474. A flat electrode 476 is disposed on a low-voltage electrode connecting plate 475, with its upper end located within the gas cavity of the gas chamber 474. The lower end of a pointed electrode 472 and the upper end of the flat electrode 476 are positioned vertically opposite each other within the gas cavity of the gas chamber 474. A trigger electrode 473 extends into the gas cavity of the gas chamber 474. When the trigger electrode 473 does not receive a trigger signal, the pointed electrode 472 and the flat electrode 476 are not conductive, and the spark gap switch 47 is in an open state. When the trigger electrode 473 receives a trigger signal, causing the pointed electrode 472 and the flat electrode 476 to conduct, the spark gap switch 47 is in a conductive state. In this embodiment, the switch 47 employs an axisymmetric distributed multi-in-one spark gap switch, which reduces the delay of the switch 47, improves the synchronization of the switch 47, and reduces the jitter of the switch 47. The switch 47 rapidly releases the energy of the main capacitor bank upon conduction, generating a supersonic plasma plate within the annular cavity 10 of the electrode assembly 1, accelerating the plasma.

[0076] See Figures 8 to 13 In this embodiment, preferably, the air valve intake assembly 3 includes an outer liner 31, an inner liner 32, a fly disc 33, a spring 35, an air valve coil 36, and an intake pipe 37.

[0077] The upper end of the outer liner 31 is recessed downward to form a cavity 310. An air hole 311 is provided on the side wall of the cavity 310, connecting the cavity 310 of the outer liner 31 to the air inlet 100 on the inner electrode 12 of the electrode assembly 1. Combined with... Figure 4The air valve inlet assembly 3 is inserted into the accommodating space 123 on the lower end face of the inner electrode 12 of the electrode assembly 1 via the outer liner 31 and is connected and fixed to the inner electrode 12. Preferably, a connecting flange 313 extends radially outward on the lower outer circumferential surface of the outer liner 31. The connecting flange 313 is used to connect and fix to the lower end face of the inner electrode 12 of the electrode assembly 1 by bolts, so as to install and fix the air valve inlet assembly 3 on the lower end face of the inner electrode 12 of the electrode assembly 1. After the air valve inlet assembly 3 is installed and fixed to the inner electrode 12 of the electrode assembly 1, the air hole 311 on the outer liner 31 is connected to the air inlet hole 100 on the inner electrode 12 of the electrode assembly 1, thereby connecting the cavity 310 of the outer liner 31 with the air inlet hole 100 on the inner electrode 12 of the electrode assembly 1. Corresponding to the plurality of air inlets 100 evenly distributed circumferentially on the inner electrode 12 of the electrode assembly 1, a plurality of air holes 311 are evenly distributed circumferentially on the sidewall of the cavity 310 of the outer liner 31. The plurality of air holes 311 are connected to the plurality of air inlets 100 in a one-to-one correspondence. The air inlets 100 on the inner electrode 12 of the electrode assembly 1 are oblique holes that are inclined upward relative to the axis of the inner electrode 12 to the annular cavity 10 of the electrode assembly 1. Correspondingly, the air holes 311 on the outer liner 31 extend upwardly from the inner circumferential side of the cavity 310 to the outer circumferential side of the cavity 310, so that the axes of the air holes 311 and the air inlets 100 can coincide when they are connected, so as to ensure smooth air intake. To ensure the air intake effect, preferably, the air holes 311 on the outer liner 31 are connected to and covered by the air intake holes 100 on the inner electrode 12 of the electrode assembly 1. That is, the air holes 311 on the outer liner 31 are completely covered by the air intake holes 100 on the inner electrode 12 of the electrode assembly 1, so that the gas passing through the air holes 311 on the outer liner 31 can all enter the air intake holes 100 on the inner electrode 12 of the electrode assembly 1 and be injected into the annular cavity 10 of the electrode assembly 1.

[0078] The inner liner 32 is fixedly fitted inside the cavity 310 of the outer liner 31. The flying disc 33 is movably fitted inside the cavity 310 of the outer liner 31. The flying disc 33 is located on the upper end surface of the inner liner 32, forming a gas storage chamber 34 between it and the inner liner 32. The gas storage chamber 34 is used to store gas. An air inlet pipe 37 is connected to the gas storage chamber 34, and the air inlet pipe 37 is used to evacuate the gas storage chamber 34 and to input gas into the gas storage chamber 34. The gas storage chamber 34 is preferably an annular chamber. Multiple air inlet pipes 37 can be provided, and the multiple air inlet pipes 37 are evenly distributed along the circumference of the gas storage chamber 34. A solenoid valve is installed on the air inlet pipe 37 to control the opening and closing of the air inlet pipe 37. The flying disc 33 has a window 330. When the flying disc 33 is in contact with the upper end surface of the inner liner 32, the window 330 on the flying disc 33 is located below the air hole 311 on the outer liner 31, but is not connected to the air hole 311. When the flying disc 33 rises and the window 330 passes through the air hole 311 on the outer liner 31, the window 330 connects the air storage chamber 34 with the air hole 311, thereby allowing air to enter the air inlet 100 on the electrode 12 inside the electrode assembly 1. Corresponding to the multiple air holes 311 evenly distributed circumferentially on the side wall of the cavity 310 of the outer liner 31, the flying disc 33 is evenly distributed circumferentially with multiple windows 330. The multiple windows 330 are arranged one-to-one with the multiple air holes 311, and when the flying disc 33 rises and the window 330 passes through the air hole 311 on the outer liner 31, they connect one-to-one with the multiple air holes 311. Preferably, the width of the window 330 on the flying disc 33 extending circumferentially along the flying disc 33 is greater than the width of the air hole 311 on the outer liner 31 extending circumferentially along the outer liner 31. This ensures that when the flying disc 33 rises and the window 330 passes through the air hole 311 on the outer liner 31, the window 330 can cover the air hole 311 circumferentially, thus guaranteeing the air intake effect. The height of the window 330 extending axially along the flying disc 33 determines the distance the window 330 travels through and connects with the air hole 311 when the flying disc 33 rises, thereby determining the air intake volume.

[0079] Spring 35 applies a downward preload to the flying disc 33. The upper end of spring 35 is fixed, and the lower end of spring 35 elastically presses against the upper surface of the flying disc 33, thereby applying a downward elastic pressure to the flying disc 33. The downward preload applied by spring 35 to the flying disc 33 causes the flying disc 33 to fit against the upper surface of the inner liner 32. This is the initial state. In the initial state, the window 330 on the flying disc 33 is located below the air hole 311 on the outer liner 31 and is not connected to the air hole 311. The air storage chamber 34 between the flying disc 33 and the inner liner 32 is closed. Gas can be introduced into the air storage chamber 34 after the air inlet pipe 37 is evacuated, so as to store the gas in the air storage chamber 34. One or more springs 35 can be provided. When multiple springs 35 are provided, the multiple springs 35 are evenly distributed along the circumference of the flying disc 33. To facilitate assembly, the top of the accommodating space 123 on the lower end face of the electrode 12 in the electrode assembly 1 is also provided with a blind hole 124 for accommodating the spring 35.

[0080] The valve coil 36 is located between the inner liner 32 and the outer liner 31, within the cavity 310 of the outer liner 31, and on the side of the inner liner 32 away from the disc 33. Preferably, the lower end of the inner liner 32 is recessed upwards to form a receiving cavity 323, within which the valve coil 36 is housed. The valve coil 36 is connected to the valve capacitor 362 via a valve thyristor 361. The valve coil 36 is a copper coil. Preferably, the valve coil 36 is a disc-shaped coil. The disc 33 is made of metal, such as aluminum. When the valve thyristor 361 conducts and discharges the charged valve capacitor 362, the valve coil 36 generates a momentary current, and a mirror-induced current is generated in the disc 33 adjacent to the valve coil 36. Under the influence of electromagnetic force, the disc 33 overcomes the downward preload of the spring 35 and is propelled upwards and accelerated. When the flying disc 33 rises, the window 330 on the flying disc 33 passes through the air hole 311 on the outer liner 31, connecting the air storage chamber 34 with the air hole 311. That is, the air storage chamber 34 is connected to the air inlet 100 on the electrode 12 inside the electrode assembly 1, thereby opening the air valve air inlet assembly 3 (e.g., Figure 9 (As shown). Then, the flying disc 33 continues to rise. After the window 330 on the flying disc 33 completely passes through the air hole 311 on the outer liner 31, the connection between the air storage chamber 34 and the air inlet 100 on the electrode 12 inside the electrode assembly 1 is broken, thus closing the air valve inlet assembly 3. The process of opening and closing the air valve inlet assembly 3 with each rise of the flying disc 33 completes one air intake of the air valve inlet assembly 3.

[0081] Therefore, the air valve intake assembly 3 of this embodiment can uniformly inject milligram-level gas into the inner electrode 12 of the electrode assembly 1 within a hundred microseconds. Furthermore, by changing and adjusting the intake parameters (such as intake pressure and intake duration), spring 35 parameters (such as preload and stiffness coefficient), air valve capacitor 362 energy, the height dimension of the window 330 on the flying disc 33 extending along the axial direction of the flying disc 33, and the position of the window 330, the intake time and intake quality can be adjusted to meet different operational requirements.

[0082] In this example, multiple air valve capacitors 362 are provided. The multiple air valve capacitors 362 are arranged below the electrode assembly 1, in the internal space of the second coaxial inner transmission plate 463, and are coaxial with the electrode assembly 1 and distributed in a circle along the circumference to form an air valve capacitor group.

[0083] In a preferred embodiment, see [link to preferred embodiment]. Figure 10The lower outer peripheral surface of the inner liner 32 is fitted to the side wall of the cavity 310 of the outer liner 31, and an outer annular groove 321 is formed between the upper outer peripheral surface of the inner liner 32 and the side wall of the cavity 310 of the outer liner 31. An inner annular groove 322 is formed circumferentially on the upper surface of the inner liner 32. The outer periphery of the flying disc 33 is bent downward to form an outer wing 331, which is inserted into the outer annular groove 321. A window 330 is formed on the outer wing 331. Preferably, the outer peripheral surface of the outer wing 331 is fitted to the side wall of the cavity 310 (the outer peripheral side wall of the outer annular groove 321), and the inner peripheral surface of the outer wing 331 is fitted to the upper outer peripheral surface of the inner liner 32 (the inner peripheral side wall of the outer annular groove 321). An annular inner wing 332 extends downward from the lower surface of the flying disc 33. The inner wing 332 is coaxial with the outer wing 331 and is inserted into an inner annular groove 322 on the inner liner 32. An air storage chamber 34 is formed between the inner wing 332 and the outer peripheral wall of the inner annular groove 322. Preferably, the outer peripheral surface of the inner wing 332 is a tapered surface extending obliquely from top to bottom towards the inner peripheral side of the inner wing 332, so as to form a gap between the outer peripheral surface of the inner wing 332 and the outer peripheral wall of the inner annular groove 322. Preferably, the inner peripheral surface of the inner wing 332 is in contact with the inner peripheral wall of the inner annular groove 322. In order to ensure the airtightness of the air chamber 34 in the initial state, the lower surface of the flying disc 33 can fit with the upper surface of the inner liner 32, and the height of the outer wing 331 extending downward does not exceed the height of the outer annular groove 321, and the height of the inner wing 332 extending downward does not exceed the height of the inner annular groove 322.

[0084] To facilitate the circumferential positioning of the flying disc 33 and the outer liner 31, so that the window 330 on the flying disc 33 and the air hole 311 on the outer liner 31 are circumferentially opposite each other, allowing the window 330 to communicate with the air hole 311 on the outer liner 31 when the flying disc 33 rises, preferably, see Figures 11 to 13 The outer wing 331 of the flying disc 33 has an axially extending boss 333 on its outer peripheral surface, and the side wall of the cavity 310 of the outer liner 31 has an axially extending groove 312. The boss 333 can be inserted into the groove 312 in a vertically movable manner, and circumferential positioning is achieved through the insertion and engagement of the boss 333 and the groove 312. Preferably, a plurality of bosses 333 are evenly distributed circumferentially on the outer peripheral surface of the outer wing 331 of the flying disc 33, and correspondingly, a plurality of grooves 312 are evenly distributed circumferentially on the side wall of the cavity 310 of the outer liner 31, with the plurality of bosses 333 and the plurality of grooves 312 corresponding to each other in an insertion and engagement manner.

[0085] To increase the airtightness of the gas storage chamber 34, preferably, see [reference needed]. Figure 10A sealing ring 38 is provided on the outer periphery of the inner annular groove 322 and / or the inner periphery of the inner annular groove 322 between the upper end face of the liner 32 and the flying disc 33. Preferably, a sealing ring groove is formed on the upper end face of the liner 32 on the outer periphery of the inner annular groove 322 and / or the inner periphery of the inner annular groove 322, and the sealing ring 38 is embedded in the sealing ring groove. The sealing ring groove is preferably a dovetail groove to prevent the sealing ring 38 from falling out.

[0086] In this embodiment, the lower end face of the inner liner 32 is in close contact with the bottom wall of the cavity 310 of the outer liner 31. Preferably, an O-ring 39 is provided between the outer periphery of the lower end face of the inner liner 32 and the bottom wall of the cavity 310 of the outer liner 31 for sealing.

[0087] After the air valve intake assembly 3 opens and closes once during the ascent of the flying disc 33, completing one intake of air, the flying disc 33 will descend and return to its initial state under the pressure of the spring 35. During the return journey of the flying disc 33, gas may enter between the inner circumference of the inner wing 332 of the flying disc 33 and the upper end face of the inner liner 32. To facilitate the extraction of this gas, preferably, an extraction port (not shown in the figure) is provided on the upper end face of the inner liner 32 on the inner circumference of the inner annular groove 322. This extraction port is connected to an extraction pipe (not shown in the figure) to extract the gas that entered between the inner circumference of the inner wing 332 of the flying disc 33 and the upper end face of the inner liner 32 during the return journey of the flying disc 33.

[0088] It should be noted that during the return descent of the flying disc 33, the window 330 on the flying disc 33 will once again enter the annular cavity 10 of the electrode assembly 1 through the air hole 311 on the outer liner 31. However, at this time, the magnetized plasma jet generator has already completed the plasma jet emission, so it will not affect the overall performance of the magnetized plasma jet generator.

[0089] Based on the above-described magnetized plasma jet generating device, this embodiment of the invention also provides a method for generating a magnetized plasma jet. The magnetized plasma jet generating method of this embodiment uses the magnetized plasma jet generating device described above, and the magnetized plasma jet generating method of this embodiment is also the working method of the magnetized plasma jet generating device described above.

[0090] The magnetized plasma jet generation method of this embodiment is as follows: First, the main capacitor transmission component 4 provides a pre-ionization voltage to the electrode component 1. The bias field component 2 forms a bias magnetic field in the annular cavity 10 of the electrode component 1. Then, the gas valve inlet component 3 injects the required mass of gas into the annular cavity 10 from the lower end of the annular cavity 10. The injected gas is pre-ionized under the action of the pre-ionization voltage to form initial plasma. Then, the main capacitor transmission component 4 provides an instantaneous current to the electrode component 1.

[0091] Specifically, in the initial state of preparation for launch, the magnetized plasma jet generator fully charges the bias field capacitor bank of the bias field assembly 2 and the main capacitor bank of the main capacitor transmission assembly 4, and charges the gas valve capacitor bank of the gas valve inlet assembly 3 to a specified voltage. The gas valve inlet assembly 3 evacuates the gas storage chamber 34 through the inlet pipe 37, and then controls the solenoid valve on the inlet pipe 37 to open for a set time and then close, so that the working gas fills the gas storage chamber 34. At this time, the switch 47 of the main capacitor transmission assembly 4 is opened, and the voltage of the main capacitor bank is applied to the outer electrode 11 and inner electrode 12 of the electrode assembly 1 through the current limiting resistor 481 and the inductor 482, that is, the main capacitor transmission assembly 4 provides a pre-ionization voltage to the electrode assembly 1. When the bias field thyristor 22 of the bias field component 2 is turned on, the bias field capacitor bank is discharged, which excites the bias field coil 21 to generate a strong bias magnetic field. The strong bias magnetic field diffuses through the slit 14 on the outer electrode 11 of the electrode component 1 to the magnetization cavity 102 in the annular cavity 10, and diffuses to the conical cavity 101 and the expansion cavity 103, eventually filling the annular cavity 10.

[0092] When the magnetized plasma jet generator is launched, the thyristor 361 of the air valve inlet assembly 3 is turned on, causing the air valve capacitor bank to discharge. The air valve coil 36 generates a momentary current, and a mirror-induced current is generated in the flying disc 33 adjacent to the air valve coil 36. Under the influence of electromagnetic force, the flying disc 33 overcomes the downward preload of the spring 35 and is propelled upward and accelerated. During the ascent of the flying disc 33, the window 330 on the flying disc 33 connects the air storage chamber 34 with the air hole 311 on the outer liner 31 when passing through the air hole 311, thus connecting the air storage chamber 34 with... The air inlet 100 on the electrode 12 inside the electrode assembly 1 is connected, causing the air valve inlet assembly 3 to open and intake air into the annular cavity 10 of the electrode assembly 1. The flying disc 33 continues to rise. After the window 330 on the flying disc 33 completely passes through the air hole 311 on the outer liner 31, the connection between the air storage chamber 34 and the air inlet 100 on the electrode 1 inside the electrode assembly 1 is broken, the air valve inlet assembly 3 closes, and the air valve inlet assembly 3 completes one intake, uniformly injecting the required mass of gas into the annular cavity 10 from the lower end of the electrode assembly 1. Then, the flying disc 33 descends and returns to its initial state under the pressure of the spring 35. The gas injected into the annular cavity 10 is pre-ionized by the pre-ionization voltage provided by the main capacitor transmission assembly 4 to form an initial plasma and flows towards the upper end of the annular cavity 10. When it expands to the inlet of the expansion cavity 103 in the annular cavity 10, the switch 47 of the main capacitor transmission assembly 4 is turned on, and the main capacitor bank discharges to provide a large instantaneous current to the electrode assembly 1. The large instantaneous current applied to the electrode assembly 1 forms a supersonic, super-Alfvén velocity plasma plate at the bottom of the pre-ionized gas in the annular cavity 10, compresses the pre-ionized gas in front, and accelerates it to a magnetic Reynolds number greater than 10 under the impetus of the Lorentz force, thereby effectively freezing the magnetic flux in the plasma. When the plasma leaves the upper end of the annular cavity 10 of the electrode assembly 1, the magnetic field lines inside the plasma are reconnected to form a ring-shaped magnetized plasma cluster with a certain magnetic helicity.

[0093] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A magnetized plasma jet generator, characterized in that, include: The electrode assembly (1) has an annular cavity (10) formed inside, which is closed at the lower end and open at the upper end; A bias field assembly (2) is disposed on the outside of the annular cavity (10), and the bias field assembly (2) is used to form a bias magnetic field inside the annular cavity (10); A gas valve inlet assembly (3) is provided at the lower part of the electrode assembly (1). The gas valve inlet assembly (3) is used to inject gas into the annular cavity (10) from the lower end of the annular cavity (10). The main capacitor transmission assembly (4) is coaxially disposed below the electrode assembly (1) and connected to the electrode assembly (1). The main capacitor transmission assembly (4) provides the electrode assembly (1) with a pre-ionization voltage and a transient current. The annular cavity (10) includes a conical cavity (101), a magnetization cavity (102), and an expansion cavity (103) connected sequentially from bottom to top. The diameter of the conical cavity (101) gradually decreases from bottom to top. The radial inner and outer walls of the conical cavity (101) are curved surfaces. The diameter of the magnetization cavity (102) is smaller than the diameter of the expansion cavity (103). The bias field assembly (2) generates a bias magnetic field in the magnetization cavity (102) from the outer periphery of the magnetization cavity (102).

2. The magnetized plasma jet generator according to claim 1, characterized in that, The electrode assembly (1) includes an outer electrode (11) and an inner electrode (12). The outer electrode (11) is sleeved on the inner electrode (12) and forms the annular cavity (10) between the outer electrode (11) and the inner electrode (12). An inter-electrode insulating pad (13) is provided between the lower end of the outer electrode (11) and the lower end of the inner electrode (12) to close the lower end of the annular cavity (10).

3. The magnetized plasma jet generator according to claim 2, characterized in that, The main capacitor transmission assembly (4) includes a main capacitor (41). The two electrodes of the main capacitor (41) are respectively connected to the low-voltage electrode plate (42) and the high-voltage electrode plate (43) of the main capacitor. The low-voltage electrode plate (42) of the main capacitor is connected to the outer electrode (11) through the outer current transmission plate (45). The high-voltage electrode plate (43) of the main capacitor is connected to the inner electrode (12) through the inner current transmission plate (46). A switch (47) and a current-limiting resistor (481) and an inductor (482) connected in parallel with the switch (47) are provided between the high-voltage electrode plate (43) of the main capacitor and the inner current transmission plate (46).

4. The magnetized plasma jet generator according to claim 3, characterized in that, The switch (47) is a spark gap switch.

5. The magnetized plasma jet generator according to claim 1, characterized in that, The bias field assembly (2) includes a bias field coil (21), which is connected to a bias field capacitor (23) via a bias field thyristor (22). The electrode assembly (1) has a slit (14) that passes through the annular cavity (10). The bias field coil (21) is wound around the electrode assembly (1) and covers the slit (14).

6. The magnetized plasma jet generator according to claim 5, characterized in that, The bias field assembly (2) further includes a diode (24) connected in parallel with the bias field capacitor (23).

7. The magnetized plasma jet generator according to claim 1, characterized in that, The lower end of the electrode assembly (1) is provided with an air inlet (100) communicating with the lower end of the annular cavity (10). The air valve inlet assembly (3) includes an outer liner (31), an inner liner (32), a flying disc (33), a spring (35), an air valve coil (36), and an air inlet pipe (37). The upper end of the outer liner (31) is recessed downward to form a cavity (310). An air hole (311) is provided on the side wall of the cavity (310). 11) The concave cavity (310) and the air inlet (100) are connected; the inner liner (32) is fixedly fitted inside the concave cavity (310); the flying disc (33) is movably fitted inside the concave cavity (310), the flying disc (33) is located on the upper end surface of the inner liner (32) and forms an air storage chamber (34) between the flying disc (33) and the inner liner (32), the flying disc (33) is provided with a window (330), the flying disc (33) and the air inlet (100) are connected. When the upper surfaces of the liner (32) are in contact, the window (330) is located below the air hole (311). When the flying disc (33) rises and the window (330) passes through the air hole (311), the window (330) connects the air storage chamber (34) and the air hole (311). The spring (35) applies a downward preload to the flying disc (33), causing the flying disc (33) to be in contact with the upper surface of the liner (32). The valve coil (36) is located between the inner liner (32) and the outer liner (31) and on the side of the inner liner (32) away from the flying disc (33). The valve coil (36) is connected to the valve capacitor (362) through the valve thyristor (361). The air inlet pipe (37) is connected to the gas storage chamber (34). The air inlet pipe (37) is used to evacuate the gas storage chamber (34) and to input gas into the gas storage chamber (34).

8. The magnetized plasma jet generator according to claim 7, characterized in that, The lower outer peripheral surface of the liner (32) is in contact with the side wall of the cavity (310), and an outer annular groove (321) is formed between the upper outer peripheral surface and the side wall of the cavity (310). An inner annular groove (322) is provided on the upper surface of the liner (32) along the circumferential direction. The outer periphery of the flying disc (33) is bent downward to form an outer wing (331) that is inserted into the outer annular groove (321). The window (330) is opened on the outer wing (331). An annular inner wing (332) extends downward on the lower surface of the flying disc (33). The inner wing (332) is inserted into the inner annular groove (322) and is spaced between the inner annular groove (322) and the outer peripheral side wall of the inner annular groove (322) to form the air storage chamber (34).

9. A method for generating a magnetized plasma jet, characterized in that, Using the magnetized plasma jet generator as described in any one of claims 1 to 8, the main capacitor transmission assembly (4) first provides a pre-ionization voltage to the electrode assembly (1), and the bias field assembly (2) forms a bias magnetic field in the annular cavity (10) of the electrode assembly (1). Then, the gas valve inlet assembly (3) injects the required mass of gas into the annular cavity (10) from the lower end of the annular cavity (10). The injected gas is pre-ionized under the action of the pre-ionization voltage to form an initial plasma, and then the main capacitor transmission assembly (4) provides an instantaneous current to the electrode assembly (1).

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