Hydraulic model and design method of a new pump-jet propulsor with movable flexible guide vanes

Abstract

The present invention discloses a hydraulic model and design method of a pump-jet propulsor with a movable flexible guide vane, which relates to the technical field of underwater vehicle propulsors, including flexible guide vanes, rotors, stators, stator hubs and rotating shafts; the stator hub is a hollow structure, a support bearing is arranged in the stator hub, and the support bearing is used to support and position the rotating shaft; a stator and a flexible guide vane are arranged on the outer wall of the stator hub; a rotor is arranged on the rotating shaft, and the rotor is arranged between the stator and the flexible guide vane; the stator, the rotor and the flexible guide vane are all arranged in a conduit, wherein the stator is fixedly connected to the conduit; the conduit is a conical structure, the flexible guide vane is arranged at the large end position of the conical structure, and the stator is arranged at the small end position of the conical structure. The present invention can better adapt to complex sea conditions such as non-uniform wake and oblique flow by adding flexible guide vanes, and improve its stability and hydrodynamic performance under complex sea conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater vehicle propulsion, and in particular to a hydraulic model and a design method of a pump-jet propulsion with movable flexible guide vanes. Background Art

[0002] The research and development technology of marine equipment such as underwater vehicles is a strategic equipment related to the national economy and people's livelihood as well as national security. Marine equipment mainly relies on its propulsion system when navigating and operating underwater. As a core component, it is the source of power for underwater vehicles, so that the vehicle can obtain the required speed and range. Propulsion technology is one of the key technologies for the development of vehicles, which determines its underwater navigation performance such as maneuverability and navigation speed, and ensures that it can complete tasks efficiently and safely underwater. Among them, pump-jet propulsion has the advantages of high concealment and high efficiency. As a form of propulsion that has only developed in China in recent years, it is mainly composed of structures such as rotors, stators and ducts. It is mainly a propulsion system designed further on the basis of propeller or axial flow pump theory, and the noise level is also relatively low. Therefore, pump-jet propulsion is the most suitable choice for marine equipment, especially high-speed underwater vehicles, and its low noise characteristics have improved the overall acoustic concealment of marine equipment to a certain extent.

[0003] As a propulsion form that started relatively late in research, pump-jet propulsion is mainly used in the military field. Due to its concealment and excellent hydrodynamic performance, it has gradually attracted the attention of many researchers. With the advancement of military-to-civilian conversion in recent years, it has also been gradually used in small and medium-sized underwater vehicles. However, traditionally, the design of pump-jet propulsion only considers the complexity of the underwater working environment and the requirements of concealment, among which the propulsion load (thrust and torque) is the main consideration. However, if the underwater vehicle encounters crossflow or wind during operation, the pump-jet propulsion will inevitably operate in oblique flow conditions, and the phenomenon of oblique flow into water is widely present during the operation of the propulsion. Oblique flow is a relatively simple non-uniform flow, which is widely present in the process of lateral movement and turning of the vehicle. When the pump-jet propulsion works in an oblique flow, the oblique flow affects the hydrodynamic performance of the pump-jet and its lateral load, which will not only affect the thrust and torque to a certain extent, causing the thrust and torque curves to change relative to the open water state, but also generate a strong exciting force, which has an adverse effect on the stability of the vehicle's manipulation. Summary of the invention

[0004] In view of the shortcomings in the prior art, the present invention provides a hydraulic model of a pump-jet propulsor with movable flexible guide vanes. On the basis of the original pump-jet hydraulic model, by adding flexible guide vanes, it can better adapt to complex sea conditions such as non-uniform wake and oblique flow, thereby improving its stability and hydrodynamic performance under complex sea conditions.

[0005] The present invention achieves the above technical objectives through the following technical means.

[0006] A hydraulic model of a pump-jet propeller with movable flexible guide vanes, comprising flexible guide vanes, a rotor, a stator, a stator hub and a rotating shaft;

[0007] The stator hub is a hollow structure, and a support bearing is arranged inside the stator hub, and the support bearing is used to support and position the rotating shaft; a stator and a flexible guide vane are arranged on the outer wall of the stator hub; a rotor is arranged on the rotating shaft, and the rotor is placed between the stator and the flexible guide vane; the stator, the rotor and the flexible guide vane are all placed in a conduit, wherein the stator is fixedly connected to the conduit; the conduit is a conical structure, the flexible guide vane is arranged at the large end position of the conical structure, and the stator is arranged at the small end position of the conical structure.

[0008] Furthermore, a guide vane shaft is installed on the flexible guide vane; one end of the guide vane shaft is vertically installed on the stator hub, and the other end is vertically installed on the guide tube.

[0009] Furthermore, the flexible guide vane is made of rubber; the flexible guide vane is thick in the middle and thin at both sides.

[0010] Furthermore, a rolling groove and a placement groove are provided in the flexible guide vane; the rolling groove and the placement groove form a T-shaped structure; a connecting line is provided in the rolling groove, and a ball is installed on the connecting line. Under the action of external force, the ball slides along the rolling groove. When the ball slides into the placement groove, the connecting line pulls the flexible guide vane to make the two sides of the flexible guide vane shrink toward the middle; a sealing cover is provided at the outlet end of the placement groove.

[0011] Furthermore, a hole is provided on the ball, and the connecting wire passes through the hole.

[0012] Furthermore, the rolling groove is arranged along the horizontal direction of the flexible guide vane, and the placement groove is arranged along the vertical direction of the flexible guide vane.

[0013] Furthermore, the rotor inlet circulation is equal to the flexible guide vane outlet circulation.

[0014] Furthermore, the number of blades of the flexible guide vane is 3, the number of blades of the rotor is 7, and the number of blades of the stator is 9.

[0015] Furthermore, the flexible guide vane swings around the guide vane shaft within an opening range of 0 to 30 degrees.

[0016] A design method for a pump-jet propeller with movable flexible guide vanes comprises the following steps:

[0017] a. Conduct theoretical analysis and selection of pump-jet propulsors according to design requirements and given conditions, and determine the hydraulic geometric parameters of flexible guide vanes, rotors, stators and ducts;

[0018] b. A two-dimensional axial projection of the inner and outer walls of the flexible guide vanes, rotors, and stators; a three-dimensional model of the duct is obtained by a two-dimensional axial projection of the inner and outer walls of the duct;

[0019] c. Calculate the inlet and outlet circulations of the flexible guide vanes, where the outlet circulation of the flexible guide vanes is taken as the inlet circulation of the rotor, and the outlet circulation of the rotor is equal to the inlet circulation of the stator; and combine the results obtained in step a and step b to determine the three-dimensional geometric shapes of the flexible guide vanes, rotor, and stator using a parameterized ternary inverse problem design method;

[0020] d. Select the opening of the flexible guide vane, the flexible guide vane swings around the guide vane axis within an opening range of 0 to 30 degrees, and the side inclination angle is linearly distributed along the radial direction of the blade;

[0021] e. Based on the pump-jet propulsion model obtained in steps c and d, the computational fluid dynamics (CFD) method is used to calculate its hydrodynamic performance under the design speed, rotation speed and wake conditions, and determine whether the hydrodynamic performance of the pump-jet propulsion meets the design requirements: if so, proceed to the next step; if not, repeatedly iterate steps b to e to modify the axial projection diagram of the pump-jet propulsion, and adjust the blade surface load distribution law of the rotor and stator in the three-dimensional inverse problem design process, the circulation of the rotor and stator, and the opening of the front movable flexible guide vane blades, and redesign the three-dimensional geometric shapes of the three blades;

[0022] f. Determine the hydraulic model of the pump-jet propulsor with a front circumferential asymmetric arrangement.

[0023] Beneficial effects:

[0024] 1. The flexible guide vane involved in the present invention is easy to install and manufacture, has low cost, and has obvious effect, and is suitable for underwater submersibles, etc.

[0025] 2. The present invention can achieve the purpose of improving the internal flow stability of the pump-jet propulsor under complex sea conditions. The flexible guide vanes are made of rubber material, which reduces the probability of vortex occurrence, is conducive to the stable operation of the pump-jet propulsor, and reduces thrust loss. The new high-efficiency pump-jet propulsor has a more stable thrust.

[0026] 3. The present invention facilitates the guide vane tail end to adjust the deflection direction according to the water flow pressure on both sides through the horizontal rolling groove in the flexible guide vane and the sliding ball in the horizontal rolling groove;

[0027] 4. Compared with the traditional pump-jet propeller, the flexible guide vanes of the pump-jet propeller of the present invention effectively absorb the energy lost in the incoming flow when operating under complex sea conditions, thereby improving the propulsion efficiency of the new high-efficiency propeller.

[0028] 5. The inlet circulation of the rotor is equal to the outlet circulation of the flexible guide vane, and the various components of the designed pump-jet propulsor cooperate better, improving the hydrodynamic performance.

[0029] 6. The number of blades is prime to each other, making the internal flow more stable.

[0030] 7. When there is incoming flow, the flexible guide vane can rotate 0 to 30 degrees around the guide vane shaft. At the same time, the internal structure of the flexible guide vane itself can also make the flexible guide vane shrink toward the middle on both sides under the action of external force. Whether the flexible guide vane rotates relative to the guide vane shaft or the flexible guide vane shrinks toward the middle, the probability of vortex occurrence can be reduced and thrust loss can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the three-dimensional structure of a hydraulic model of a novel pump-jet propeller with movable flexible guide vanes involved in an embodiment of the present invention;

[0032] Figure 2 It is a two-dimensional cross-sectional schematic diagram of a novel pump-jet propeller with movable flexible guide vanes according to an embodiment of the present invention;

[0033] Figure 3 It is a schematic diagram of the structure of the front movable flexible guide vane blades in the novel pump-jet propulsor with movable flexible guide vanes according to an embodiment of the present invention;

[0034] Figure 4 It is a top view of the front movable flexible guide vane blade in the novel pump-jet propulsor with movable flexible guide vane according to an embodiment of the present invention;

[0035] Figure 5 for Figure 4 AA cross-sectional view.

[0036] Figure numerals: 1-flexible guide vane, 2-rotor, 3-stator, 4-stator hub, 5-rotating shaft, 6-support bearing, 7-conduit, 8-guide vane shaft, 9-sealing cover, 10-placing groove, 11-connecting wire, 12-rolling groove; 13-ball. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0039] A hydraulic model of a pump-jet propulsor with movable flexible guide vanes, comprising a flexible guide vane 1, a rotor 2, a stator 3, a stator hub 4 and a rotating shaft 5; the stator hub 4 is a hollow structure, and a support bearing 6 is arranged inside the stator hub 4, and the support bearing 6 is used to support and position the rotating shaft 5; the stator 3 and the flexible guide vane 1 are arranged on the outer wall of the stator hub 4; the rotor 2 is arranged on the rotating shaft 5, and the rotor 2 is arranged between the stator 3 and the flexible guide vane 1; the stator 3, the rotor 2 and the flexible guide vane 1 are all arranged in a conduit 7, wherein the stator 3 is fixedly connected to the conduit 7; the conduit 7 is a conical structure, the flexible guide vane 1 is arranged at the large end position of the conical structure, and the stator 3 is arranged at the small end position of the conical structure.

[0040] Wherein, a guide vane shaft 8 is installed on the flexible guide vane 1; one end of the guide vane shaft 8 is vertically installed on the stator hub 4, and the other end is vertically installed on the guide tube 7.

[0041] The flexible guide vane 1 is made of rubber; the flexible guide vane 1 is thick in the middle and thin at both sides.

[0042] A rolling groove 12 and a placement groove 10 are provided in the flexible guide vane 1; the rolling groove 12 and the placement groove 10 form a T-shaped structure; a connecting line 11 is provided in the rolling groove 12, and a ball 13 is installed on the connecting line 11. Under the action of external force, the ball 13 slides along the rolling groove 12. When the ball 13 slides into the placement groove 10, the connecting line 11 pulls the flexible guide vane 1 to make the two sides of the flexible guide vane 1 shrink toward the middle; a sealing cover 9 is provided at the outlet end of the placement groove 10.

[0043] The ball 13 is provided with a hole, and the connecting wire 11 passes through the hole.

[0044] The rolling groove 12 is arranged along the horizontal direction of the flexible guide vane 1 , and the placement groove 10 is arranged along the vertical direction of the flexible guide vane 1 .

[0045] The inlet circulation of the rotor 2 is equal to the outlet circulation of the flexible guide vane 1.

[0046] The number of blades of the flexible guide vane 1 is 3, the number of blades of the rotor blade 2 is 7, and the number of blades of the stator 3 is 9.

[0047] The flexible guide vane 1 swings around the guide vane shaft 8 within an opening range of 0 to 30°.

[0048] A design method for a pump-jet propeller with movable flexible guide vanes comprises the following steps:

[0049] a. Conduct theoretical analysis and selection of the pump-jet propulsor according to the design requirements and given conditions, and determine the hydraulic geometric parameters of the flexible guide vane 1, rotor 2, stator 3 and duct 7;

[0050] b. A two-dimensional axial projection of the inner and outer walls of the flexible guide vane 1, the rotor 2, and the stator 3; a two-dimensional axial projection of the inner and outer walls of the conduit 7 to obtain a three-dimensional model of the conduit 7;

[0051] c. Calculate the inlet and outlet circulations of the flexible guide vane 1, the outlet circulation of the flexible guide vane 1 is taken as the inlet circulation of the rotor 2, and the outlet circulation of the rotor 2 is equal to the inlet circulation of the stator 3; and combine the results obtained in step a and step b to determine the three-dimensional geometric shapes of the flexible guide vane 1, the rotor 2, and the stator 3 using a parameterized ternary inverse problem design method;

[0052] d. Select the opening of the flexible guide vane 1, the flexible guide vane 1 swings around the guide vane shaft 8 within an opening range of 0 to 30 degrees, and the side inclination angle is linearly distributed along the radial direction of the blade;

[0053] e. Based on the pump-jet propulsion model obtained in steps c and d, the computational fluid dynamics (CFD) method is used to calculate its hydrodynamic performance under the design speed, rotation speed and wake conditions, and determine whether the hydrodynamic performance of the pump-jet propulsion meets the design requirements: if so, proceed to the next step; if not, repeatedly iterate steps b to e to modify the axial projection diagram of the pump-jet propulsion, and adjust the blade surface load distribution law of the rotor 2 and stator 3 in the three-dimensional inverse problem design process, the circulation of the rotor and stator, and the opening of the front movable flexible guide vane blades, and redesign the three-dimensional geometric shapes of the three blades;

[0054] f. Determine the hydraulic model of the pump-jet propulsor with a front circumferential asymmetric arrangement.

[0055] Combined with Figure 1The present invention provides a hydraulic model of a pump-jet propulsor with a movable flexible guide vane, comprising a rotor 2, a stator 3 and a stator hub 4, a flexible guide vane 1 and a duct 7. The blades of the flexible guide vane 1 and the blades of the stator 3 behind the blades of the rotor 2 are circumferentially symmetrically arranged on their respective fixed hubs, and the blade tips of the stator 3 blades are simultaneously fixed to the inner wall surface of the conical duct 7, and the blades of the flexible guide vane 1 are connected to the duct 7 through an adjusting device. The rotating shaft 5 coaxially passes through the flexible guide vane 1, the stator hub 4 and the rotor 2 in sequence, the rotor 2 is fixedly sleeved on the outside of the rotating shaft 5 and driven by the rotating shaft 5 to do work, and the rotating shaft 5 is coaxially supported inside the stator hub 4 through a sliding support bearing 6. The material used for the flexible guide vane 1 is a flexible material. A rolling groove 12 is provided inside the flexible guide vane 1. The rolling groove 12 is horizontally arranged, and a ball 13 and a connecting line 11 are built in. A placement groove 10 is provided above the rolling groove 12. A sealing cover 9 is provided at the notch of the placement groove 10. The built-in ball 13 facilitates the flexible guide vane 1 to deflect when it is impacted by water flow. The maximum opening of its active angle is 30 degrees, which can be adjusted according to different working conditions. The outer wall surface of the duct 7 adopts a deceleration duct, and is an airfoil structure with good flow performance. The inlet circulation of the rotor 2 is equal to the outlet circulation of the flexible guide vane 1. The fluid in the wake zone at the stern of the underwater vehicle gradually enters the rotor inlet along the guide vane radius profile. The number of blades of the flexible guide vane 1 is 3, the number of blades of the rotor 2 is 7, and the number of blades of the stator 3 is 9. The material 1 used for the flexible guide vane is rubber.

[0056] A hydraulic model design method for a novel pump-jet propulsor with movable flexible guide vanes comprises the following steps:

[0057] a. According to the design requirements and given conditions, conduct theoretical analysis and selection of the pump-jet propulsor, and determine the hydraulic geometric parameters of the flexible guide vane 1, rotor 2, stator 3 and duct 7.

[0058] b. Determine the two-dimensional axial projection of the inner and outer walls of the flexible guide vane 1, rotor 2, stator 3 and duct 7 of the pump-jet propulsor; the three-dimensional model of the duct is obtained from the two-dimensional axial projection of the inner and outer walls of the duct 7; the three-dimensional geometric shapes of the flexible guide vane 1, rotor 2 and stator 3 are jointly confirmed by the hydrodynamic parameters and the axial geometry, blade cross-section thickness distribution and stacking angle and other geometric parameters;

[0059] c. The inlet and outlet circulations of the flexible guide vane 1 are calculated. The outlet circulation of the flexible guide vane 1 is taken as the inlet circulation of the rotor 2. The outlet circulation of the rotor 2 is equal to the inlet circulation of the stator 3. The blade circulation distribution is the blade load distribution, which also represents the strength of the work done by the blade. The blade load (the pressure difference between the pressure surface and the suction surface of the blade) is closely related to the derivative of the circumferential average circulation rVt in the axial streamline direction. The mathematical model is:

[0060]

[0061] Where, is the relative velocity of the axial surface to the blade surface, m is the axial projection length of the blade streamline, The value is equal to Integral of the projected length along the streamline axis

[0062] When the flexible guide vane blades, rotor blades and stator blades are three-dimensionally geometric, the root section of the blade adopts the form of intermediate uniform load distribution, that is, the pressure load on the blade surface first rises at the front end, reaches a peak at 20% of the blade airfoil chord length, and then is smoothly and evenly distributed in the middle, using linear interpolation for transition, and finally decreases at 60% of the chord length, and finally drops to 0; a small angle of attack is used at the inlet edge of the root section of the guide vane and stator blades, and a small angle of attack is used at the outlet edge of the tip section of the rotor blade. And combined with the results obtained in step a and step b, the three-dimensional geometric shape of the flexible guide vane 1, rotor 2 and stator 3 is determined by using the parameterized ternary inverse problem design method;

[0063] d. Select the opening of the flexible guide vane, which is about 30°, and the side inclination angle is linearly distributed along the blade radial direction; the purpose is to make the fluid in the wake zone enter the rotor inlet along the guide vane radius section, so as to reduce the pressure pulsation of the rotor blade. At the same time, the present invention adopts flexible guide vanes, and in complex sea conditions such as oblique flow and combined with flexible materials, the angle is automatically adjusted according to the incoming flow conditions, effectively reducing the instability of the incoming flow and increasing the propeller efficiency.

[0064] e. Based on the pump-jet propulsion model obtained in steps c and d, the computational fluid dynamics (CFD) method is used to calculate its hydrodynamic performance under the design speed, rotation speed and wake conditions to determine whether the hydrodynamic performance of the pump-jet propulsion meets the design requirements:

[0065] Based on a high-performance computer platform, the propulsion performance of the pump-jet propulsor is calculated and evaluated using computational fluid dynamics methods and experimental means. If the hydrodynamic performance meets the requirements, proceed to the next step; if not, repeatedly iterate steps b to e to modify the axial projection diagram of the pump-jet propulsor, and adjust the blade surface load distribution law of the rotor 2 and stator 3 in the three-dimensional inverse problem design process, the circulation of the rotor and stator, and the opening of the front movable flexible guide vane blades, and redesign the three-dimensional geometric shapes of the three blades;

[0066] f. Determine the hydraulic model of a new pump-jet propulsor with movable flexible guide vanes.

[0067] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0068] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A hydraulic model of a pump-jet propeller with movable flexible guide vanes, characterized in that: It comprises a flexible guide vane (1), a rotor (2), a stator (3), a stator hub (4) and a rotating shaft (5); The stator hub (4) is a hollow structure, a support bearing (6) is arranged inside the stator hub (4), and the support bearing (6) is used to support and position the rotating shaft (5); a stator (3) and a flexible guide vane (1) are arranged on the outer wall of the stator hub (4); a rotor (2) is arranged on the rotating shaft (5), and the rotor (2) is arranged between the stator (3) and the flexible guide vane (1); the stator (3), the rotor (2) and the flexible guide vane (1) are all arranged in a conduit (7), wherein the stator (3) is fixedly connected to the conduit (7); the conduit (7) is a conical structure, the flexible guide vane (1) is arranged at the large end position of the conical structure, and the stator (3) is arranged at the small end position of the conical structure; A guide vane shaft (8) is installed on the flexible guide vane (1); one end of the guide vane shaft (8) is vertically installed on the stator hub (4), and the other end is vertically installed on the guide tube (7).

2. The hydraulic model of a pump-jet propeller with movable flexible guide vanes according to claim 1 is characterized in that: The flexible guide vane (1) is made of rubber; the flexible guide vane (1) is thick in the middle and thin at both sides.

3. The hydraulic model of a pump-jet propeller with movable flexible guide vanes according to claim 1 is characterized in that: The flexible guide vane (1) is provided with a rolling groove (12) and a placement groove (10); the rolling groove (12) and the placement groove (10) form a T-shaped structure; a connecting line (11) is provided in the rolling groove (12), and a ball (13) is installed on the connecting line (11); under the action of an external force, the ball (13) slides along the rolling groove (12); when the ball (13) slides into the placement groove (10), the connecting line (11) pulls the flexible guide vane (1) so that both sides of the flexible guide vane (1) shrink toward the middle; and a sealing cover (9) is provided at the outlet end of the placement groove (10).

4. The hydraulic model of a pump-jet propeller with movable flexible guide vanes according to claim 3 is characterized in that: The ball (13) is provided with a hole, and the connecting wire (11) passes through the hole.

5. The hydraulic model of a pump-jet propeller with movable flexible guide vanes according to claim 3 is characterized in that: The rolling groove (12) is arranged along the horizontal direction of the flexible guide vane (1), and the placement groove (10) is arranged along the vertical direction of the flexible guide vane (1).

6. The hydraulic model of a pump-jet propeller with movable flexible guide vanes according to claim 1, characterized in that: The inlet circulation of the rotor (2) is equal to the outlet circulation of the flexible guide vane (1).

7. The hydraulic model of a pump-jet propeller with movable flexible guide vanes according to claim 1, characterized in that: The number of blades of the flexible guide vane (1) is 3, the number of blades of the rotor blade (2) is 7, and the number of blades of the stator (3) is 9.

8. The hydraulic model of a pump-jet propeller with movable flexible guide vanes according to claim 1, characterized in that: The flexible guide vane (1) swings around the guide vane shaft (8) within an opening range of 0 to 30 degrees.

9. A design method for a pump-jet propeller with movable flexible guide vanes, characterized in that: The following steps are involved: a. Conduct theoretical analysis and selection of the pump-jet propulsor according to the design requirements and given conditions, and determine the hydraulic geometric parameters of the flexible guide vane (1), the rotor (2), the stator (3) and the duct (7); b. A two-dimensional axial projection of the inner and outer walls of the flexible guide vane (1), the rotor (2), and the stator (3); a two-dimensional axial projection of the inner and outer walls of the conduit (7) to obtain a three-dimensional model of the conduit (7); c. Calculate the inlet and outlet circulations of the flexible guide vane (1), the outlet circulation of the flexible guide vane (1) is taken as the inlet circulation of the rotor (2), and the outlet circulation of the rotor (2) is equal to the inlet circulation of the stator (3); and combine the results obtained in step a and step b to determine the three-dimensional geometric shapes of the flexible guide vane (1), the rotor (2), and the stator (3) using a parameterized ternary inverse problem design method; d. Selecting the opening of the flexible guide vane (1), the flexible guide vane (1) swings around the guide vane shaft (8) within an opening range of 0 to 30°, and the side inclination angle is linearly distributed along the radial direction of the blade; e. Based on the pump-jet propulsion model obtained in steps c and d, the computational fluid dynamics (CFD) method is used to calculate its hydrodynamic performance under the design speed, rotation speed and wake conditions, and determine whether the hydrodynamic performance of the pump-jet propulsion meets the design requirements: if so, proceed to the next step; if not, repeatedly iterate steps b to e to modify the axial projection diagram of the pump-jet propulsion, and adjust the blade surface load distribution law of the rotor (2) and stator (3) in the three-dimensional inverse problem design process, the circulation of the rotor and stator, and the opening of the front movable flexible guide vane blades, and redesign the three-dimensional geometric shapes of the three blades; f. Determine the hydraulic model of the pump-jet propulsor with a front circumferential asymmetric arrangement.

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