Gas-liquid two-phase pump jet propulsion device for underwater vehicle

Abstract

The invention provides a gas-liquid two-phase pump jet propulsion device for an underwater navigation body, and belongs to the technical field of underwater propellers, the gas-liquid two-phase pump jet propulsion device for the underwater navigation body comprises a pump jet assembly, the pump jet assembly is installed in a propeller guide pipe, and the propeller guide pipe is fixedly installed at the rear end of a navigation body shell; the pump jet assembly comprises a paddle shaft, a front stator, a rotor and a rear stator which are sequentially installed in the fluid direction. The gas supply unit comprises a high-pressure gas storage container, the high-pressure gas storage container is communicated with a gas adjusting device through a gas filtering unit, the gas adjusting device is communicated with a gas conveying pipe, the gas conveying pipe is communicated with an annular nozzle, the annular nozzle is connected with an inner cavity of an annular mixing cavity, and the annular mixing cavity is installed in the inner cavity of the annular mixing cavity. The annular mixing cavity is located at the rear end of the pump jet assembly. By fusing the pump spraying momentum transfer principle and the gas-liquid two-phase flow control technology, the thrust can be remarkably improved, and the technical breakthrough of reducing the working noise and improving the cavitation critical speed is synchronously realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of underwater propulsion devices, and in particular relates to a gas-liquid two-phase pump-jet propulsion device for underwater navigation bodies. Background Art

[0002] Currently, conventional pump-jet propulsion for underwater vehicles is a traditional propulsion method widely used in the marine sector. Its enclosed design reduces cavitation noise and offers significant advantages over traditional propeller propulsion, particularly in terms of stealth performance and operational flexibility. However, the propulsion efficiency of pump-jet propulsion at high speeds still needs to be improved, especially in complex environments or under special fluid conditions, where the efficiency drop can be significant. Faced with the growing requirements of naval equipment, conventional pump-jet propulsion technology no longer meets these requirements, and more advanced pump-jet propulsion technology is needed.

[0003] Gas-liquid two-phase pump-jet propulsion technology combines the advantages of conventional pump-jet propulsion and gas-liquid two-phase ramjet propulsion, offering higher thrust, improved cavitation resistance, and lower noise. Gas-liquid two-phase propulsion optimizes thrust output by mixing the flow of gas and liquid. Its unique gas-liquid interaction can improve propulsion efficiency under specific conditions, while also providing excellent cooling and cavitation reduction. Although this type of propulsion has seen initial application in aerospace, research in marine propulsion systems is relatively limited. The complex flow characteristics and instabilities of gas-liquid two-phase fluids also pose challenges to design and control. Summary of the Invention

[0004] The purpose of the present invention is to provide a gas-liquid two-phase pump-jet propulsion device for underwater vehicles, which significantly improves thrust and simultaneously achieves reduced working noise and increased cavitation critical speed.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A gas-liquid two-phase pump-jet propulsion device for an underwater vehicle, comprising: a pump jet assembly, an annular mixing chamber, a gas supply unit, and a guide nozzle;

[0007] The pump jet assembly is installed inside the propeller duct, and the propeller duct is fixedly installed at the rear end of the vehicle shell. The pump jet assembly includes a propeller shaft, a front stator, a rotor, and a rear stator installed in sequence along the fluid direction;

[0008] The gas supply unit includes a high-pressure gas storage container, which is connected to a gas regulating device through the gas filter unit, and the gas regulating device is connected to a gas delivery pipe, and the gas delivery pipe is connected to an annular nozzle, and the annular nozzle is connected to the inner cavity of the annular mixing chamber. The annular mixing chamber is installed inside the inner cavity of the annular mixing chamber, and the annular mixing chamber is located at the rear end of the pump jet assembly;

[0009] The guide nozzle is installed at the tail end of the thruster duct.

[0010] Furthermore, the front stator, the rotor, and the rear stator are located on the same central axis, and the front stator, the rotor, and the rear stator are evenly distributed along the flow direction.

[0011] Furthermore, the annular mixing chamber is located at the middle end of the propeller and is flush with one end of the inner wall of the propeller duct.

[0012] Furthermore, the annular mixing cavity is a hollow cylindrical structure, and a matrix-distributed ventilation micropore array is vertically arranged on the wall surface of the annular mixing cavity.

[0013] Furthermore, the front end of the annular mixing cavity is sealedly connected to the annular nozzle, and the rear end of the annular mixing cavity is sealedly connected to the inner wall of the propeller duct.

[0014] Furthermore, the outer wall of the inner cavity of the annular mixing chamber and the inner wall of the thruster duct have hollow areas, and the size of the gap gradually decreases from the front end to the rear end to ensure sufficient contact between the gas and the liquid to form a stable gas-liquid two-phase fluid.

[0015] Furthermore, the inner wall of one end of the propeller duct is straight, and the other end is contracted. The diameter of the water inlet of the propeller duct is larger than the diameter of the water outlet at the right end, so as to improve the power output of the propeller.

[0016] Furthermore, the front and rear ends of the annular nozzle are sealedly connected to the inner wall of the propeller duct and the front end of the annular mixing cavity respectively.

[0017] Furthermore, a plurality of air jet holes are distributed on the annular nozzle, and the air jet holes are evenly distributed around the circumference.

[0018] Furthermore, a rudder blade shell is installed on the navigation body shell.

[0019] The beneficial effects of the present invention are:

[0020] The pump jet of the present invention can effectively guide the movement of gas-liquid two-phase fluid, forming a more stable and efficient thrust output. At the same time, by providing a device that can adjust gas parameters, it is beneficial to increase the control of thrust and efficiency.

[0021] The internal structure of the propeller of the present invention is connected through a sealed connection, which ensures that the gas-liquid two-phase fluid will not leak during the mixing process, improves the propulsion efficiency, and effectively prevents bubbles from entering the propeller to generate noise.

[0022] The present invention, through its optimized annular mixing chamber and gas supply unit, effectively enhances the mixing of gas-liquid two-phase fluids, significantly improving propulsion efficiency. Compared to traditional pump-jet propulsion, gas-liquid two-phase propulsion technology can generate higher thrust under the same conditions and reduce energy consumption.

[0023] The present invention is provided with an annular mixing chamber at the rear section of the thruster, and a matrix-distributed ventilation micropore array is provided on its circumferential wall surface, which cooperates with the optimized design of the internal flow channel to realize efficient mixing and stable transportation of gas-liquid media. The gas supply system integrates a high-pressure gas storage container (with a built-in vehicle cabin), a precision flow gas regulating device, a multi-stage filtration unit and an annular distributor, and realizes the purification and precise injection of compressed gas through a closed-loop control pipeline. The guide nozzle is optimized by fluid dynamics and is arranged at the end of the system to realize directional injection of the mixed working fluid. This innovative device can significantly improve the thrust by integrating the pump jet momentum transfer principle and the gas-liquid two-phase flow control technology, and simultaneously achieves a technological breakthrough in reducing working noise and increasing the cavitation critical speed. It is especially suitable for the new generation of submarines, intelligent submersibles and high-speed underwater carrier platforms, and provides an innovative solution for the concealed maneuverability and efficient propulsion of underwater equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Attachment Figure 1 It is a structural schematic diagram of the present invention.

[0025] Attachment Figure 2 It is a schematic diagram of the propeller shaft, front stator, rotor and rear stator blade structure of the present invention.

[0026] Attachment Figure 3 It is a structural schematic diagram of the annular nozzle of the present invention.

[0027] Attachment Figure 4 It is a structural schematic diagram of the annular mixing cavity of the present invention.

[0028] In the attached figure: 1. Navigation body shell, 2. Rudder blade shell, 3. Front stator, 4. Propeller duct, 5. Gas delivery pipe, 6. Annular nozzle, 7. Annular mixing chamber, 8. High-pressure gas storage container, 9. Gas filter unit, 10. Gas regulating device, 11. Propeller shaft, 12. Rotor, 13. Rear stator, 14. Inner cavity of annular mixing chamber, 15. Guide nozzle, 16. Gas injection hole of annular nozzle. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the accompanying drawings.

[0030] Example 1:

[0031] The present invention provides a gas-liquid two-phase pump jet propulsion device for underwater vehicles, as shown in the attached Figure 1-2 As shown, it includes: a pump jet assembly, an annular mixing chamber 14, a gas supply unit and a guide nozzle 15;

[0032] The pump jet assembly is installed inside the propeller duct 4, and the propeller duct 4 is fixedly installed at the rear end of the vehicle shell 1. The pump jet assembly includes a propeller shaft 11, a front stator 3, a rotor 12, and a rear stator 13 installed in sequence along the fluid direction;

[0033] The gas supply unit includes a high-pressure gas storage container 8, which is connected to a gas regulating device 10 through the gas filter unit 9. The gas regulating device 10 is connected to a gas delivery pipe 5, which is connected to an annular nozzle 6. The annular nozzle 6 is connected to the inner cavity 14 of the annular mixing chamber. The inner cavity 14 of the annular mixing chamber is equipped with an annular mixing chamber 7. The annular mixing chamber 7 is located at the rear end of the pump jet assembly.

[0034] The guide nozzle 15 is installed at the tail end of the thruster duct 4 .

[0035] A rudder blade housing 2 is installed on the navigation body housing 1.

[0036] Specifically, the front stator 3 , the rotor 12 , and the rear stator 13 are located on the same central axis, and the front stator 3 , the rotor 12 , and the rear stator 13 are evenly distributed along the flow direction.

[0037] In this embodiment, the inner wall of one end of the propeller duct 4 is straight, and the other end is contracted. The water inlet diameter of the propeller duct 4 is larger than the water outlet diameter at the right end to improve the power output of the propeller.

[0038] like Figure 4 As shown, the annular mixing chamber 7 is located at the middle end of the propeller and is flush with one end of the inner wall of the propeller duct 4. The annular mixing chamber 7 is a hollow cylindrical structure, and a matrix-distributed ventilation micropore array is vertically arranged on the wall of the annular mixing chamber 7.

[0039] The front end of the annular mixing cavity 7 is sealedly connected to the annular nozzle 6 , and the rear end of the annular mixing cavity 7 is sealedly connected to the inner wall of the propeller duct 4 .

[0040] The outer wall of the inner cavity 14 of the annular mixing chamber and the inner wall of the thruster conduit 4 have hollow areas, and the size of the gap gradually decreases from the front end to the rear end to ensure sufficient contact between the gas and the liquid to form a stable gas-liquid two-phase fluid.

[0041] As attached Figure 3 As shown, the front and rear ends of the annular nozzle 6 are respectively sealed to the inner wall of the propeller duct 4 and the front end of the annular mixing chamber 7. A plurality of air injection holes 16 are distributed on the annular nozzle 6, and the air injection holes 16 are evenly distributed around the circumference.

[0042] Example 2:

[0043] According to the gas-liquid two-phase pump-jet propulsion device for underwater vehicles described in Example 1, as shown in the attached Figure 1-4 As shown, the vehicle shell 1 is used to accommodate a high-pressure gas storage container, and the external connection is connected to the propeller through a gas delivery pipe 5;

[0044] The inner wall of the front end of the propeller duct 4 is straight, with a contraction trend at the right end, and the diameter of the water inlet at the left end is larger than the diameter of the water outlet at the right end, so as to improve the power output of the propeller;

[0045] An annular mixing chamber 7 is provided in the propeller conduit 4. The annular mixing chamber 7 is located in the middle section of the propeller, is designed as a hollow cylinder and is installed horizontally. The wall surface is provided with a matrix of ventilation micropores, all of which are perpendicular to the axis. The outer wall of the inner cavity 14 of the annular mixing chamber and the inner wall of the propeller retain a hollow area, and the size of the gap gradually decreases from the front end to the rear end to ensure sufficient contact between the gas and the liquid, forming a stable gas-liquid two-phase fluid;

[0046] The left end of the inner cavity 14 of the annular mixing chamber is connected to the annular nozzle 6, and the left end of the annular nozzle 6 is connected to the inner cavity of the propeller. A sealing device is provided at the connection to ensure no leakage, thereby improving the mixing efficiency. Thirteen cylindrical gas injection holes 16 with uniform apertures are evenly arranged along the axis of the annular nozzle 6 to ensure uniform gas injection. The front end of the gas injection hole 16 is connected to the gas delivery pipe 5. The gas delivery pipe 5 is connected to the external gas delivery pipe from the front stator blade and is externally connected to the high-pressure gas storage container 8 / gas regulating device 10 and gas filter unit 9;

[0047] The gas filter unit 9 is arranged between the high-pressure gas storage container 8 and the gas regulating device 10 to prevent impurities from entering the annular mixing cavity and affecting the mixing effect of the gas-liquid two-phase fluid;

[0048] The front stator blades 3 are arranged at the inlet of the propeller duct 4, with a total of 13 stators. The blade tips are connected to the inner wall of the duct and the blade roots are fixedly mounted on the propeller shaft 11, providing pre-swirl for the rotor inlet flow; the rotor blades 12 are installed behind the front stator 3, with a total of nine rotors, and the blade roots are fixed on the propeller shaft 11, providing the main power for the propeller;

[0049] The rear stator 13 is arranged between the rotor 12 and the annular nozzle 6, the blade top is connected to the inner wall of the duct and the blade root is fixedly installed on the propeller shaft 11. A total of nine stators are provided, which can recycle the rotor wake energy to achieve energy saving and efficiency improvement effects; the propeller shaft 11 is horizontally installed along the axis at the rear end of the navigation body 1; the nozzle 15 is installed at the rear end of the inner cavity 14 of the annular mixing chamber to accelerate the gas-liquid two-phase mixed flow to achieve the effect of increasing thrust.

[0050] In this embodiment, when installing different components, it is ensured that the inner walls of the components are connected flush to ensure that the flow path in the propeller is smooth.

[0051] Example 3:

[0052] The difference between the gas-liquid two-phase pump-jet propulsor of this embodiment and that of embodiment 2 is that:

[0053] The inner wall of the annular mixing chamber 7 is increased with a perforation layout having various apertures and more gas pipes 5 are added to further enhance the gas-liquid mixing effect and improve the adaptability of the propeller under different loads.

[0054] For other structures, please refer to the first embodiment.

[0055] Example 4:

[0056] The difference between the gas-liquid two-phase pump-jet propulsor of this embodiment and that of embodiment 2 is that:

[0057] This embodiment of the gas-liquid two-phase pump-jet thruster features modified inlet expansion end and annular mixing chamber lengths, as well as vent diameters, making the thruster more compact and adaptable. By optimizing structural integration, this embodiment reduces system complexity while ensuring thrust output, making it suitable for applications where space is limited or high efficiency is required.

[0058] The design of the gas-liquid two-phase propeller system of the present invention comprehensively considers the mixing of gas-liquid two-phase fluids, the gas supply unit, and the optimization of thrust and efficiency. The device is first assembled and then connected to the navigation body cabin through the propeller shaft 11. The uniform diameter perforations in the annular mixing chamber 7 ensure full contact between gas and liquid while suppressing cavitation, reducing noise and extending the life of the components; the matching between the rotor 12 and the front stator 3 and the rear stator 13 ensures efficient power transmission; the gas supply unit accurately adjusts the gas flow and pressure, and filters impurities at the same time to ensure stable operation. The metal structure of the propeller adopts a new manufacturing process to forge the bar stock and directly form it with five-axis CNC processing, which is conducive to improving processing efficiency, ensuring the accuracy of the propeller profile, and improving surface roughness. The use of duplex stainless steel propellers has higher strength and stronger corrosion resistance.

[0059] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A gas-liquid two-phase pump-jet propulsion device for underwater vehicles, characterized in that: include: A pump jet assembly, an annular mixing chamber (14), a gas supply unit and a flow guide nozzle (15); The pump jet flow assembly is installed inside a propeller duct (4), and the propeller duct (4) is fixedly installed at the rear end of the vehicle shell (1). The pump jet flow assembly includes a propeller shaft (11), a front stator (3), a rotor (12), and a rear stator (13) which are installed in sequence along the fluid direction. The gas supply unit comprises a high-pressure gas storage container (8), the high-pressure gas storage container (8) is communicated with a gas regulating device (10) through the gas filter unit (9), the gas regulating device (10) is communicated with a gas delivery pipe (5), the gas delivery pipe (5) is communicated with an annular nozzle (6), the annular nozzle (6) is connected to the inner cavity (14) of the annular mixing chamber, the inner cavity (14) of the annular mixing chamber is provided with the annular mixing chamber body (7), and the annular mixing chamber body (7) is located at the rear end of the pump jet assembly; The guide nozzle (15) is installed at the tail end of the thruster duct (4).

2. The gas-liquid two-phase pump-jet propulsion device for underwater vehicles according to claim 1, characterized in that: The front stator (3), the rotor (12), and the rear stator (13) are located on the same central axis, and the front stator (3), the rotor (12), and the rear stator (13) are evenly distributed along the flow direction.

3. The gas-liquid two-phase pump-jet propulsion device for underwater vehicles according to claim 1, characterized in that: The annular mixing chamber (7) is located at the middle end of the propeller and is flush with one end of the inner wall of the propeller duct (4).

4. The gas-liquid two-phase pump-jet propulsion device for underwater vehicles according to claim 3, characterized in that: The annular mixing cavity (7) is a hollow cylindrical structure, and a matrix-distributed ventilation micropore array is vertically arranged on the wall surface of the annular mixing cavity (7).

5. The gas-liquid two-phase pump-jet propulsion device for underwater vehicles according to claim 3 or 4, characterized in that: The front end of the annular mixing cavity (7) is sealedly connected to the annular nozzle (6), and the rear end of the annular mixing cavity (7) is sealedly connected to the inner wall of the propeller duct (4).

6. The gas-liquid two-phase pump-jet propulsion device for underwater vehicles according to claim 5, characterized in that: The outer wall of the inner cavity (14) of the annular mixing chamber and the inner wall of the thruster conduit (4) have hollow areas, and the size of the gap gradually decreases from the front end to the rear end to ensure sufficient contact between the gas and the liquid to form a stable gas-liquid two-phase fluid.

7. The gas-liquid two-phase pump-jet propulsion device for underwater vehicles according to claim 1, characterized in that: The inner wall of one end of the propeller duct (4) is straight, and the other end is contracted. The diameter of the water inlet of the propeller duct (4) is larger than the diameter of the water outlet at the right end, so as to improve the power output of the propeller.

8. The gas-liquid two-phase pump-jet propulsion device for underwater vehicles according to claim 1, characterized in that: The front and rear ends of the annular nozzle (6) are respectively sealedly connected to the inner wall of the propeller duct (4) and the front end of the annular mixing cavity (7).

9. The gas-liquid two-phase pump-jet propulsion device for underwater vehicles according to claim 8, characterized in that: A plurality of air-jet holes (16) are distributed on the annular nozzle (6), and the air-jet holes (16) are evenly distributed around the circumference.

10. The gas-liquid two-phase pump-jet propulsion device for underwater vehicles according to claim 1, characterized in that: A rudder blade housing (2) is mounted on the navigation body housing (1).

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