Underwater magneto fluid propulsion and power generation integrated device

Abstract

The application provides an underwater magnetic fluid propulsion and power generation integrated device, which comprises a device shell, an isotope heat source, an ionization device, a ring-shaped magnetic fluid power generation device and an electromagnetic propulsion device; the isotope heat source is used for heating seawater sucked by a device head inlet; the ionization device is used for ionizing the heated seawater to promote the generation of plasma; the ring-shaped magnetic fluid power generation device converts kinetic energy and thermal energy of the plasma into electric energy; the electromagnetic propulsion device is used for applying Lorentz force to the plasma to form a jet flow which is sprayed out from a device tail outlet to generate a reaction force for propelling the device to move forward; wherein a standby battery provides electric energy to the ionization device in a device starting stage; the ring-shaped magnetic fluid power generation device supplies electric energy to the ionization device and the electromagnetic propulsion device through an electric energy distributor. The device has the advantages of no noise, long endurance, high efficiency, compact structure and the like, and is particularly suitable for persistent and covert operation of small underwater equipment.

Description

Technical Field

[0001] This invention relates to the field of underwater propulsion and power generation technology, specifically to an integrated underwater magnetohydrodynamic propulsion and power generation device. Background Technology

[0002] Chinese Patent CN116142437A discloses a variable magnetic force magnetic coupling propulsion device for an underwater vehicle. The device includes a sealed cavity within the hull; a drive motor is installed within this cavity; an active coupling component comprises an inner rotating shaft and an inner rotating part connected to it, the inner rotating shaft being mounted inside the sealed cavity and rotating about an axis; the drive motor drives the inner rotating part to rotate about the inner rotating shaft; an inner magnet assembly is installed on the rotating part; a passive coupling component comprises an outer rotating shaft and an outer rotating part connected to it, the outer rotating shaft being mounted on the hull and rotating about an axis; an outer magnet assembly is installed on the outer rotating part; and a propeller assembly is mounted on the hull and located outside the sealed cavity, connected to the outer rotating shaft, with the rotating outer rotating shaft driving the propeller assembly. This propulsion device completely eliminates the problem of water leakage causing malfunctions or even scrapping of the propulsion device's drive motor and other components.

[0003] Traditional underwater propulsion systems, such as propellers, suffer from drawbacks such as high mechanical noise, decreased efficiency with decreasing speed, and complex and easily damaged mechanical structures. Furthermore, conventional underwater equipment primarily relies on batteries or cables connected to the mother ship for power, severely limiting its range and autonomy.

[0004] Magnetohydrodynamic (MHD) propulsion is a novel technology that utilizes the Lorentz force to propel seawater, achieving reaction propulsion. It has no rotating parts and theoretically boasts advantages such as low noise, low vibration, and high efficiency. However, existing MHD propulsion schemes face two major challenges: high energy consumption, requiring a strong external current and magnetic field, placing extremely high demands on the power supply system; and efficiency issues, as seawater has low conductivity, and directly generating and conducting current in seawater leads to significant losses and unsatisfactory propulsion efficiency.

[0005] Magnetohydrodynamic (MHD) power generation technology directly converts the kinetic energy of plasma or conductive fluids into electrical energy, also possessing the advantage of having no moving parts. Currently, this technology is mostly used in high-temperature, high-speed fluid environments in aerospace, nuclear energy, and other fields, with limited application in low-temperature, low-speed underwater environments.

[0006] Currently available technologies lack a solution that effectively addresses the aforementioned problems by integrating energy, propulsion, and power generation into a single, integrated design. Therefore, there is an urgent need for an underwater propulsion system that is self-powered, low-noise, highly efficient, and compact in structure. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the purpose of this invention is to provide an integrated underwater magnetohydrodynamic propulsion and power generation device.

[0008] According to the present invention, an integrated underwater magnetohydrodynamic propulsion and power generation device includes: a device shell, an isotope heat source, an ionization device, a ring-shaped magnetohydrodynamic power generation device, and an electromagnetic propulsion device;

[0009] The device housing has a head water inlet at the front end and a tail water outlet at the rear end. The isotope heat source, ionization device, annular magnetohydrodynamic power generation device, and electromagnetic propulsion device are sequentially arranged inside the outer shell of the device along the extension direction from the water inlet at the head of the device to the water outlet at the tail of the device. The isotope heat source is used to heat the seawater drawn in through the inlet at the head of the device. The ionization device is used to ionize the heated seawater to promote the generation of plasma; The plasma flows through the annular magnetohydrodynamic power generation device and then enters the electromagnetic propulsion device, whereby the annular magnetohydrodynamic power generation device converts the kinetic and thermal energy of the plasma into electrical energy. The electromagnetic propulsion device is used to apply Lorentz force to the plasma, forming a jet stream that is ejected from the water outlet at the tail of the device, generating a reaction force that propels the device forward. The backup battery provides electrical energy to the ionization device during the device startup phase. The annular magnetohydrodynamic (MHD) power generation device is connected to the ionization device and the electromagnetic propulsion device respectively; after converting the kinetic and thermal energy of the plasma into electrical energy, the annular MHD power generation device supplies the electrical energy to the ionization device and the electromagnetic propulsion device respectively through an electrical energy distributor.

[0010] Preferably, the isotope heat source includes isotope fuel pellets, a multi-layer composite radiation shielding layer, and a heat exchanger; The multi-layer composite radiation shielding layer is wrapped around the isotopic fuel pellet, and the heat exchanger is installed outside the multi-layer composite radiation shielding layer for heat exchange with the flowing seawater.

[0011] Preferably, the heat exchanger adopts a coil or finned structure.

[0012] Preferably, the isotopic fuel pellets in the isotopic heat source use radioactive isotopes, and generate heat energy continuously and stably through the decay of the radioactive isotopes.

[0013] Preferably, the radioactive isotope includes plutonium-238 or strontium-90.

[0014] Preferably, the ionization device includes a pair of annular electrodes and a high-voltage pulse power supply; The annular electrode is circumferentially mounted on the inner wall of the device housing with the axis of the device housing as the axis, and the annular electrode is in direct contact with the seawater; The annular magnetohydrodynamic power generation device is connected to the high-voltage pulse power supply, and the annular magnetohydrodynamic power generation device provides electrical energy to the high-voltage pulse power supply; The high-voltage pulse power supply is connected to the annular electrode pair. The high-voltage pulse power supply applies a high-voltage pulse electric field to the annular electrode pair, causing the heated seawater to ionize and generate plasma through the electric field breakdown effect.

[0015] Preferably, the annular magnetohydrodynamic power generation device includes an annular channel, a magnetic field system, and a pair of power generation electrodes; The axis of the annular channel coincides with the axis of the device housing; The magnetic field system is installed inside the annular channel and is used to generate an annular power generation magnetic field. The power generation electrodes are installed on both sides of the annular power generation magnetic field. The power generation electrodes are used to transmit the electrical energy generated by the annular magnetohydrodynamic power generation device to the ionization device and the electromagnetic propulsion device respectively through the power distributor.

[0016] Preferably, the electromagnetic propulsion device includes an electromagnetic propulsion channel, a second magnetic field unit, and a propulsion electrode pair; The electromagnetic propulsion channel is located on the axis of the device housing; The second magnetic field unit is disposed outside the electromagnetic propulsion channel and surrounds the electromagnetic propulsion channel. The second magnetic field unit establishes a magnetic field within the electromagnetic propulsion channel. The propulsion electrode pair is disposed inside the electromagnetic propulsion channel and is used to inject current into the electromagnetic propulsion channel; The direction of the line connecting the propulsion electrode pair, the axis of the electromagnetic propulsion channel, and the direction of the magnetic field of the second magnetic field unit are perpendicular to each other. The propulsion electrode pair is connected to the annular magnetohydrodynamic power generation device, and transmits the electrical energy generated by the annular magnetohydrodynamic power generation device to the electromagnetic propulsion channel.

[0017] Preferably, the direction of the line connecting the propulsion electrode pair is orthogonal to the direction of the line connecting the power generation electrode pair.

[0018] Preferably, the outer shell of the device is a streamlined cylinder made of a corrosion-resistant, non-magnetic material.

[0019] Compared with the prior art, the present invention has the following beneficial effects: This invention recovers some kinetic and thermal energy into electrical energy through a magnetohydrodynamic power generation device, which powers the ionization device and electromagnetic propulsion device, which are key electrical components of the system, forming a highly efficient energy closed loop and greatly extending the endurance of underwater equipment. The entire propulsion process has no moving mechanical parts and relies entirely on electromagnetic force, which fundamentally eliminates the cavitation noise and vibration noise generated by mechanical propellers such as propellers. It is extremely quiet and is particularly suitable for noise-sensitive tasks such as military reconnaissance and marine life observation. By simultaneously heating and ionizing seawater, the conductivity of the working fluid (seawater) is significantly improved, effectively reducing losses and enabling considerable thrust to be obtained even under relatively low magnetic field and current intensity, thus improving energy conversion efficiency. The integrated design highly integrates functional modules such as heat source, ionization, power generation, and propulsion into a continuous streamlined pipe. The structure is simple, reduces connecting parts and potential failure points, improves the overall reliability and space utilization of the system, and is easy to achieve miniaturization and modular application. Attached Figure Description

[0020] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram illustrating the structure of the underwater magnetohydrodynamic propulsion and power generation integrated device of the present invention. Figure 2 This is a schematic diagram illustrating the structure of the electromagnetic propulsion device, which is the main feature of this invention.

[0021] The figure shows: 1. Device casing; 2. Seawater; 3. Device head inlet; 4. Isotope heat source; 5. Ionization device; 6. Plasma; 7. Annular magnetohydrodynamic power generation device; 8. Electromagnetic propulsion region; 9. Second magnetic field unit; 10. Jet stream; 11. Device tail outlet; 12. Propulsion electrode pair. Detailed Implementation

[0022] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0023] like Figure 1 As shown, an underwater magnetohydrodynamic propulsion and power generation integrated device according to the present invention has a coaxial streamlined cylindrical structure and includes: a device shell 1, an isotope heat source 4, an ionization device 5, an annular magnetohydrodynamic power generation device 7, and an electromagnetic propulsion device.

[0024] The outer casing 1 is a hollow cylindrical structure. The front end of the outer casing 1 is provided with a device head water inlet 3, and the rear end is provided with a device tail water outlet 11.

[0025] The isotope heat source 4, ionization device 5, annular magnetohydrodynamic power generation device 7, and electromagnetic propulsion device are sequentially arranged inside the outer shell 1 of the device along the extension direction from the water inlet 3 at the head of the device to the water outlet 11 at the tail of the device.

[0026] An isotope heat source 4 is located at the head of the device. The isotope heat source 4 is used to heat the seawater 2 drawn in by the inlet 3 at the head of the device. The isotope heat source 4 can continuously provide heat and provides the entire device with primary energy that does not require oxygen.

[0027] The ionization device 5 is used to ionize the heated seawater 2, promoting the transformation of the seawater 2 from a normal electrolyte solution into a conductive plasma 6 rich in free electrons and ions, significantly improving its conductivity. The ionization device 5 is powered by a backup battery during the device startup phase; after startup, the ionization device 5 is powered by a toroidal magnetohydrodynamic (MHD) generator 7.

[0028] The annular magnetohydrodynamic (MHD) power generation device 7 is located in the middle of the device. The annular MHD power generation device 7 is used to capture the flowing plasma 6 and convert its kinetic and thermal energy into electrical energy.

[0029] The electromagnetic propulsion device is located at the tail of the device, downstream of the annular magnetohydrodynamic power generation device 7. The plasma 6, which still has high speed and conductivity after flowing through the annular magnetohydrodynamic power generation device 7, enters the electromagnetic propulsion device. The electromagnetic propulsion device is used to apply Lorentz force to the plasma 6 and apply axial thrust to the plasma 6, forming a jet stream 10 that is ejected from the outlet 11 at the tail of the device, generating a reaction force that propels the device forward.

[0030] The backup battery provides power to the ionization device 5 during the device startup phase.

[0031] The annular magnetohydrodynamic power generation device 7 is connected to the ionization device 5 and the electromagnetic propulsion device, and the annular magnetohydrodynamic power generation device 7 supplies power to the ionization device 5 and the electromagnetic propulsion device.

[0032] During the startup phase, the backup battery provides power to the ionization device 5, which is then driven by the backup battery.

[0033] During the stable operation phase after startup, the backup battery stops working. All the electrical energy generated by the toroidal magnetohydrodynamic generator 7 is distributed to the ionization device 5 and the electromagnetic propulsion device through the power distributor. The power distributor adjusts the power supply ratio, and the ionization device 5 is allocated 30% to 40% of the electrical energy, while the electromagnetic propulsion device is allocated 60% to 70% of the electrical energy.

[0034] During operation, seawater 2 is drawn in through the inlet 3 at the head of the device. The seawater flows through the isotope heat source 4, which heats the seawater to about 800°C. The backup battery supplies power to the ionization device 5. When the ionization device 5 is working, the seawater 2 is ionized by the ionization device 5, generating plasma 6 which enters the annular magnetohydrodynamic power generation device 7.

[0035] The heated seawater 2 expands in volume and increases in pressure, flowing downstream and passing through the annular magnetohydrodynamic power generation device 7 to generate electricity. The electricity is then distributed to the ionization device 5 and the electromagnetic propulsion device via the power distributor.

[0036] When the device is in a stable operating phase, the backup battery stops supplying power to the ionization device 5, and the electrical energy generated by the annular magnetohydrodynamic power generation device 7 supplies power to the ionization device 5 and the electromagnetic propulsion device respectively through the power distributor.

[0037] After passing through the annular magnetohydrodynamic power generation device 7, the plasma 6 still retains a certain degree of conductivity and then enters the electromagnetic propulsion region. After passing through the electromagnetic propulsion region, the plasma 6 is subjected to a backward Lorentz force and collectively accelerates backward, forming a jet stream 10 that is ejected from the outlet 11 at the tail of the device, propelling the device forward.

[0038] The device provides initial energy through isotope heat source 4, enhances the conductivity of seawater 2 by heating and ionizing it, and integrates the annular magnetohydrodynamic power generation device 7 with the electromagnetic propulsion device in the same flow channel, achieving a perfect combination of efficient propulsion and self-powered operation.

[0039] Furthermore, the toroidal magnetohydrodynamic power generation device 7 recovers some kinetic and thermal energy into electrical energy, which powers the ionization device and electromagnetic propulsion device, which are key electrical components of the system, forming a highly efficient energy closed loop and greatly extending the endurance of the underwater equipment.

[0040] The entire propulsion process has no moving mechanical parts and relies entirely on electromagnetic force, which fundamentally eliminates the cavitation noise and vibration noise generated by mechanical propellers such as propellers. It operates extremely quietly and is particularly suitable for noise-sensitive tasks such as military reconnaissance and marine biological observation.

[0041] By simultaneously heating and ionizing seawater, the conductivity of the working fluid (seawater) is significantly improved, effectively reducing losses and enabling considerable thrust to be obtained even under relatively low magnetic field and current intensity, thus improving energy conversion efficiency.

[0042] The integrated design highly integrates functional modules such as heat source, ionization, power generation, and propulsion into a continuous streamlined pipe. The structure is simple, reduces connecting parts and potential failure points, improves the overall reliability and space utilization of the system, and is easy to achieve miniaturization and modular application.

[0043] The underwater magnetohydrodynamic propulsion and power generation integrated device provided by this invention has the advantages of being noiseless, having a long endurance, high efficiency, and compact structure, and is particularly suitable for the long-term covert operation of small underwater equipment.

[0044] In one feasible implementation, the isotope heat source 4 includes an isotope fuel pellet, a multilayer composite radiation shielding layer, and a heat exchanger.

[0045] A multi-layered composite radiation shielding layer is wrapped around the isotopic fuel pellets. A heat exchanger is installed outside the multi-layered composite radiation shielding layer and is used to exchange heat with the flowing seawater 2.

[0046] In one feasible implementation, the heat exchanger adopts a coil or finned structure to maximize the contact area with seawater 2, ensuring that the seawater can be heated quickly and uniformly to a predetermined temperature to form a high-temperature and high-pressure fluid.

[0047] In one feasible implementation, the isotopic fuel pellets in the isotopic heat source 4 use radioactive isotopes, which continuously and stably generate heat energy through the decay of the radioactive isotopes, providing initial heating to the low-temperature seawater 2. Utilizing isotopes with long half-lives as a "nuclear battery" provides a stable heat source for years or even decades.

[0048] In one feasible implementation, the radioactive isotope includes plutonium-238 or strontium-90.

[0049] In one feasible embodiment, the ionization device 5 includes a pair of annular electrodes and a high-voltage pulse power supply; When there are multiple pairs of annular electrodes, the multiple pairs of annular electrodes are coaxially mounted on the inner wall of the device housing 1.

[0050] The annular electrode is mounted circumferentially on the inner wall of the device housing 1 with the axis of the device housing 1 as the axis, and the annular electrode is in direct contact with the seawater 2. The toroidal magnetohydrodynamic power generation device 7 is connected to a high-voltage pulse power supply, and the toroidal magnetohydrodynamic power generation device 7 provides energy to the high-voltage pulse power supply. A high-voltage pulse power supply is connected to a ring electrode pair. The high-voltage pulse power supply applies a high-voltage pulse electric field of thousands to tens of thousands of volts between the ring electrode pairs. Through the electric field breakdown effect, the heated seawater 2 is ionized to generate plasma 6.

[0051] In one feasible embodiment, the annular magnetohydrodynamic power generation device 7 includes an annular channel, a magnetic field system, and a pair of power generation electrodes; The axis of the annular channel coincides with the axis of the outer casing 1 of the device; The magnetic field system is set inside the annular channel and is used to generate an annular power generation magnetic field; specifically, the magnetic field system includes permanent magnets or electromagnets.

[0052] The power generation electrodes are installed on both sides of the annular power generation magnetic field. The power generation electrodes are used to transmit the electrical energy generated by the annular magnetohydrodynamic power generation device 7 to the ionization device 5 and the electromagnetic propulsion device respectively through the power distributor.

[0053] The high-speed flowing plasma cuts through the magnetic field lines in the annular channel, and according to Faraday's law of electromagnetic induction, an electromotive force is induced on the power generation electrode pair. When the power generation electrode pair is connected to an external circuit, DC power can be output.

[0054] The output electrical energy, after conditioning, powers the ionization device 5 and the electromagnetic propulsion device.

[0055] like Figure 2 As shown, in one feasible embodiment, the electromagnetic propulsion device includes an electromagnetic propulsion channel 8, a second magnetic field unit 9, and a propulsion electrode pair 12.

[0056] The electromagnetic propulsion channel 8 is located on the axis of the device housing 1; The second magnetic field unit 9 is disposed outside the electromagnetic propulsion channel 8, surrounding the electromagnetic propulsion channel 8, and establishes a magnetic field within the electromagnetic propulsion channel 8. The second magnetic field unit 9 includes a superconducting magnet or a high-efficiency permanent magnet. Specifically, the second magnetic field unit 9 is an Nb-Ti superconducting magnet, generating a radial magnetic field with an intensity greater than 2T.

[0057] When there are multiple pairs of second magnetic field units 9, the multiple pairs of second magnetic field units 9 are evenly arranged along the axial direction outside the electromagnetic propulsion channel 8, forming multiple continuous cylindrical magnetic field regions.

[0058] The propulsion electrode pair 12 is disposed inside the electromagnetic propulsion channel 8 and is used to inject current into the electromagnetic propulsion channel 8; The direction of the line connecting the propulsion electrode pair 12, the axis of the electromagnetic propulsion channel 8, and the direction of the magnetic field of the second magnetic field unit 9 are perpendicular to each other. The propulsion electrode pair 12 is connected to the annular magnetohydrodynamic power generation device 7, and the electrical energy generated by the annular magnetohydrodynamic power generation device 7 is transmitted to the electromagnetic propulsion channel 8.

[0059] When plasma 6 enters the electromagnetic propulsion channel 8, the toroidal magnetohydrodynamic generator 7 supplies current to the electromagnetic propulsion channel 8 through the propulsion electrodes, and the current flows through plasma 6. The plasma is subjected to a Lorentz force in a perpendicular magnetic field, and the resultant force is along the axial direction of the channel, thereby violently propelling seawater 2 backward to achieve propulsion.

[0060] In one feasible implementation, the direction of the connection between the propulsion electrode pairs is orthogonal to the direction of the connection between the power generation electrode pairs, that is, the direction of the connection between the power generation electrode pairs and the direction of the connection between the propulsion electrode pairs are 90° apart, so as to ensure that the power generation circuit and the propulsion circuit do not interfere with each other.

[0061] In one feasible embodiment, the device housing 1 is a streamlined cylinder made of a corrosion-resistant, non-magnetic material.

[0062] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and 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 this application.

[0063] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. An integrated underwater magnetohydrodynamic propulsion and power generation device, characterized in that, include: The device includes a housing (1), an isotope heat source (4), an ionization device (5), a toroidal magnetohydrodynamic power generation device (7), and an electromagnetic propulsion device; The front end of the device housing (1) is provided with a device head water inlet (3), and the rear end is provided with a device tail water outlet (11). The isotope heat source (4), ionization device (5), annular magnetohydrodynamic power generation device (7), and electromagnetic propulsion device are sequentially arranged inside the outer shell (1) of the device along the extension direction from the head inlet (3) to the tail outlet (11). The isotope heat source (4) is used to heat the seawater (2) drawn in by the inlet (3) at the head of the device; The ionization device (5) is used to ionize the heated seawater (2) to promote the generation of plasma (6). The plasma (6) flows through the annular magnetohydrodynamic power generation device (7) and then enters the electromagnetic propulsion device. The annular magnetohydrodynamic power generation device (7) converts the kinetic and thermal energy of the plasma (6) into electrical energy. The electromagnetic propulsion device is used to apply Lorentz force to the plasma (6) to form a jet stream (10) that is ejected from the outlet (11) at the tail of the device, generating a reaction force that propels the device forward. The backup battery provides electrical energy to the ionization device (5) during the device startup phase; The annular magnetohydrodynamic power generation device (7) is connected to the ionization device (5) and the electromagnetic propulsion device respectively; after the annular magnetohydrodynamic power generation device (7) converts the kinetic energy and thermal energy of the plasma (6) into electrical energy, it supplies the electrical energy to the ionization device (5) and the electromagnetic propulsion device respectively through an electrical energy distributor.

2. The underwater magnetohydrodynamic propulsion and power generation integrated device as described in claim 1, characterized in that, The isotope heat source (4) includes an isotope fuel pellet, a multi-layer composite radiation shielding layer, and a heat exchanger. The multi-layer composite radiation shielding layer is wrapped around the isotopic fuel pellet, and the heat exchanger is installed outside the multi-layer composite radiation shielding layer. The heat exchanger is used to exchange heat with the flowing seawater (2).

3. The underwater magnetohydrodynamic propulsion and power generation integrated device as described in claim 2, characterized in that, The heat exchanger adopts a coil or finned structure.

4. The underwater magnetohydrodynamic propulsion and power generation integrated device as described in claim 2, characterized in that, The isotopic fuel pellets in the isotopic heat source (4) use radioactive isotopes and generate heat energy continuously and stably through the decay of radioactive isotopes.

5. The underwater magnetohydrodynamic propulsion and power generation integrated device as described in claim 4, characterized in that, The radioactive isotopes include plutonium-238 or strontium-90.

6. The underwater magnetohydrodynamic propulsion and power generation integrated device as described in claim 1, characterized in that, The ionization device (5) includes a pair of annular electrodes and a high-voltage pulse power supply; The annular electrode is circumferentially mounted on the inner wall of the device housing (1) with the axis of the device housing (1) as the axis, and the annular electrode is in direct contact with the seawater (2); The annular magnetohydrodynamic power generation device (7) is connected to the high-voltage pulse power supply, and the annular magnetohydrodynamic power generation device (7) provides electrical energy to the high-voltage pulse power supply; The high-voltage pulse power supply is connected to the ring electrode pair. The high-voltage pulse power supply applies a high-voltage pulse electric field to the ring electrode pair, and the heated seawater (2) is ionized by the electric field breakdown effect to generate plasma (6).

7. The underwater magnetohydrodynamic propulsion and power generation integrated device as described in claim 1, characterized in that, The annular magnetohydrodynamic power generation device (7) includes an annular channel, a magnetic field system, and a pair of power generation electrodes; The axis of the annular channel coincides with the axis of the device housing (1); The magnetic field system is installed inside the annular channel and is used to generate an annular power generation magnetic field. The power generation electrodes are installed on both sides of the annular power generation magnetic field. The power generation electrodes are used to transmit the electrical energy generated by the annular magnetohydrodynamic power generation device (7) to the ionization device (5) and the electromagnetic propulsion device respectively through the power distributor.

8. The underwater magnetohydrodynamic propulsion and power generation integrated device as described in claim 1, characterized in that, The electromagnetic propulsion device includes an electromagnetic propulsion channel (8), a second magnetic field unit (9), and a propulsion electrode pair (12). The electromagnetic propulsion channel (8) is located on the axis of the outer casing (1) of the device; The second magnetic field unit (9) is disposed outside the electromagnetic propulsion channel (8) and surrounds the electromagnetic propulsion channel (8). The second magnetic field unit (9) establishes a magnetic field inside the electromagnetic propulsion channel (8). The propulsion electrode pair (12) is disposed inside the electromagnetic propulsion channel (8) for injecting current into the electromagnetic propulsion channel (8); The direction of the line connecting the propulsion electrode pair (12), the axial direction of the electromagnetic propulsion channel (8), and the magnetic field direction of the second magnetic field unit (9) are perpendicular to each other. The propulsion electrode pair (12) is connected to the annular magnetohydrodynamic power generation device (7) to transmit the electrical energy generated by the annular magnetohydrodynamic power generation device (7) to the electromagnetic propulsion channel (8).

9. The underwater magnetohydrodynamic propulsion and power generation integrated device as described in claims 7 and 8, characterized in that, The direction of the line connecting the propulsion electrode pair is orthogonal to the direction of the line connecting the power generation electrode pair.

10. The underwater magnetohydrodynamic propulsion and power generation integrated device as described in claim 1, characterized in that, The outer shell (1) of the device is a streamlined cylinder made of corrosion-resistant, non-magnetic material.

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