Model test device for hydrodynamic performance of ship thruster and its preparation and experimental method

Abstract

The present invention relates to a model test device for the hydrodynamic performance of a ship thruster and its preparation and experimental method. The experimental device includes a test device, including: a mounting stand rigidly connected to a trailer used to tow the experimental device in water; a six-component force balance; a drive device; a right-angle dynamometer located in the thruster cabin; a hull prosthesis including a bottom plate and two side plates; a thruster model including a thruster duct and a thruster cabin; a propeller model located in the thruster duct; and a control device including a speed control module, a signal acquisition module, and a data analysis module. The model test device for the hydrodynamic performance of a ship thruster of the present invention can simulate the stress condition of the thruster and test its stress and hydrodynamic performance.

Description

Technical Field

[0001] The present invention relates to the field of ship testing, in particular to a ship thruster hydrodynamic performance model test device and a preparation and experimental method thereof. Background Art

[0002] A ship's thruster is a duct running through the ship's port and side, located near the bow (or stern) below the waterline and above the baseline. A propeller is installed within the duct, generating thrust perpendicular to the hull's length, enabling the ship's lateral motion. The hydrodynamic performance of a thruster propeller differs significantly from that of an open-water propeller due to the influence of the inlet and outlet, hull, and duct. Therefore, predicting thruster performance requires more than just focusing on the propeller itself. Currently, thruster hydrodynamic performance prediction during the ship design phase typically utilizes numerical calculations, graph interpolation, or model testing. Due to the complex flow field surrounding the thruster during operation, numerical calculations struggle to ensure accuracy. Graph interpolation methods, however, are affected by factors such as the hull and propeller shape, limiting their applicability. Model testing is the preferred method for accurately assessing thruster hydrodynamic performance. Currently, thruster hydrodynamic testing relies on full-ship testing. This is hindered by the high cost of full-ship fabrication and the limited scale of the thruster model. During the tank test, the scale of the ship model cannot be too large. Otherwise, the scale of the thruster model will be too small to meet the test requirements, and it will also be difficult to separate the forces in different directions between the thruster and the hull. Summary of the Invention

[0003] The invention provides a model test device for the hydrodynamic performance of a ship thruster, which can simulate the stress condition of the thruster and test the stress and hydrodynamic performance of the thruster.

[0004] The ship thruster hydrodynamic performance model test device of the present invention comprises:

[0005] An installation stand is rigidly connected to a trailer for towing the experimental device in water;

[0006] A six-component force balance is fixed to the mounting frame and is located below the driving device, and the six-component force balance has a middle cavity running through it from top to bottom;

[0007] A driving device is fixed relative to the mounting frame and is located above the six-component force balance;

[0008] A rectangular dynamometer is located in the propeller cabin, wherein a portion of the outer wall of the rectangular dynamometer located in the propeller cabin is engaged with an inner wall of the propeller cabin, an input end of the rectangular dynamometer passes upward through the middle cavity of the six-component force balance and is connected to the output shaft of the driving device, and is rotated under the drive of the driving device, and a portion of the outer wall of the rectangular dynamometer corresponding to the six-component force balance is detachably fixed to the six-component force balance;

[0009] The hull prosthesis comprises a bottom plate and two side plates, wherein the line shape of the hull prosthesis is the same as the line shape of the part of the hull where the thruster is installed, and the two side plates of the hull prosthesis are respectively provided with a flow hole at a corresponding position;

[0010] A thruster model includes a thruster duct, one end of the thruster duct communicating with a flow hole, and the other end of the thruster duct communicating with another flow hole. The axis of the thruster duct is perpendicular to the length direction of the hull prosthesis. The space inside the thruster duct forms a thruster duct. The thruster model also includes a thruster cabin located within the thruster duct.

[0011] A propeller model is located in the thrust duct, with its axis coinciding with or parallel to the axis of the thrust duct pipe, and the output end of the rectangular dynamometer is connected to the propeller model to drive the propeller model to rotate;

[0012] The control device includes a speed control module, a signal acquisition module and a data analysis module. The speed control module is connected to the motor to control the speed of the motor. The signal acquisition module collects the thrust, torque and various components of the six-component force balance applied to the propeller and transmits the collected data to the data analysis module for analysis.

[0013] Preferably, the thruster duct is composed of two half-tubes fixed together symmetrically about a symmetry plane, and the thruster cabin is composed of two half-cabins fixed together symmetrically about a symmetry plane, wherein one half-tube is integrally formed with one half-cabin, and the symmetry plane is a vertical plane passing through the axis of the thruster duct.

[0014] Preferably, the thruster duct and / or thruster cabin are formed by 3D printing.

[0015] Preferably, a trumpet-shaped ring is fixed in each of the flow holes, the trumpet-shaped ring has one end with a larger opening facing outward, a grille is installed in the trumpet-shaped ring, the trumpet-shaped ring is fixedly connected to the end of the hull prosthesis, and the end of the side thrust duct is fixedly connected to the trumpet-shaped ring.

[0016] Preferably, the six-component force balance is further provided with a plurality of connecting holes and a plurality of connecting pieces that can pass through the connecting holes one by one; the outer wall of the right-angle dynamometer is provided with a plurality of connecting recesses, and the plurality of connecting pieces are pushed into the plurality of connecting recesses one by one after passing through the connecting holes.

[0017] Preferably, the test device further comprises a connecting frame, wherein the connecting frame is fixedly connected to both side plates of the hull prosthesis, and the connecting frame is fixedly connected to the mounting stand.

[0018] The present invention also provides a method for preparing a ship thruster hydrodynamic performance model experimental device, which can prepare the above-mentioned experimental device, comprising the following steps:

[0019] S1, making ship prosthesis, propeller model and thruster model;

[0020] S2, Assembly, including:

[0021] c1. Install the six-component force balance and the drive device on the mounting stand, connect the input end of the right-angle dynamometer to the output end of the drive device, and detachably connect the right-angle dynamometer to the six-component force balance;

[0022] c2, connecting the propeller model to the output end of the right-angle dynamometer, installing the thruster model so that the thruster cabin of the thruster model is engaged with the right-angle dynamometer, and fixing the thruster duct to the hull prosthesis;

[0023] c3, rigidly connect the mounting frame to the trailer, connect the speed control module to the drive device, and connect the data acquisition module to the six-component force balance and the right-angle dynamometer respectively.

[0024] Preferably, the method further comprises: fixing a connecting frame to the two side plates of the hull prosthesis, and fixing the connecting frame to the mounting stand.

[0025] Preferably, the method further includes the steps of preparing a trumpet ring and a grille, and installing the grille and the trumpet ring. When installing the grille and the trumpet ring, the trumpet ring is fixedly connected to the thruster model to achieve the fixed connection of the thruster duct and the prosthesis in step c2.

[0026] Preferably, in step 1, the ship prosthesis is made of wood or 3D printed according to the hull lines; and / or the propeller model is made of aluminum alloy by machine processing, and the processed propeller model is surface anodized; and / or the trumpet ring and grille models are respectively 3D printed; and / or the propeller model is 3D printed.

[0027] The present invention also provides an experimental method for a ship thruster hydrodynamic performance model experimental device, wherein the method comprises the following steps:

[0028] A. Adjust the vertical height of the mounting platform so that the hull dummy reaches the test target waterline;

[0029] B. Test system debugging and zero calibration;

[0030] C, start the trailer and accelerate to the specified speed;

[0031] D. Given the driving speed set by the drive device, measure the thrust, torque of the propeller model and the components of force in six directions acting on the assembly.

[0032] Preferably, the driving speed of the driving device is changed, and the thrust, torque and six-direction force components of the propeller model are measured; and / or the trailer speed is changed, and the thrust, torque and six-direction force components of the propeller model are measured.

[0033] Preferably, the propeller model and / or the flared ring and / or the grille are replaced and steps A, B, C and D are repeated.

[0034] Compared with the prior art, the present invention has the following beneficial effects: the ship thruster hydrodynamic performance model test device of the present invention does not need to manufacture the entire ship but only manufactures a dummy identical to the part of the hull where the thruster is installed to conduct the experiment, thereby reducing the cost of the experiment and, at the same time, reducing the size restrictions of the hull dummy. At the same time, the dummy model retains the hull line features near the thruster and can accurately simulate the influence of this part of the hull on the thruster working flow field. At the same time, the forces acting on other parts of the hull in different directions from the thruster are separated. The thrust, torque and various components of the six-component force balance received by the thruster are collected by the signal acquisition module and the collected data is transmitted to the data analysis module for analysis, thereby evaluating the various performances of the thruster. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The figure is a schematic structural diagram of a model test device for the hydrodynamic performance of a ship thruster according to an embodiment of the present invention.

[0036] Figure 2 The figure is a structural schematic diagram of a hull prosthesis of a ship thruster hydrodynamic performance model test device according to an embodiment of the present invention.

[0037] Figure 3 The present invention is a schematic structural diagram of a thruster model of a ship thruster hydrodynamic performance model test device according to an embodiment of the present invention.

[0038] Figure 4The figure is a structural schematic diagram of a propeller model of a ship thruster hydrodynamic performance model test device according to an embodiment of the present invention.

[0039] Figure 5 This is a schematic structural diagram of the trumpet ring and grille of a ship thruster hydrodynamic performance model test device according to an embodiment of the present invention, wherein the left figure is a schematic structural diagram of the trumpet ring, and the right figure is a schematic structural diagram of the trumpet ring and grille after assembly.

[0040] Figure 6 This is a schematic diagram of the connection between a rectangular dynamometer and a six-component force balance of a ship thruster hydrodynamic performance model test device according to an embodiment of the present invention.

[0041] Reference numerals

[0042] 1. Install the stand;

[0043] 2 driving device, 21 motor, 22 gear box;

[0044] 3 six-component force balance, 31 connecting hole, 32 connecting piece;

[0045] 4 right-angle dynamometer;

[0046] 5 hull prosthesis, 51 bottom plate, 52 side plate, 521 flow hole;

[0047] 6 thruster model, 61 thruster duct, 611 half-tube, 6111 protrusion, 6112 mounting hole, 62 thruster cabin, 621 half-cabin;

[0048] 7 propeller models;

[0049] 8 flared rings;

[0050] 9 grilles. DETAILED DESCRIPTION

[0051] The present invention provides a model test device for the hydrodynamic performance of a ship thruster. Figure 1As shown, it includes: a mounting platform 1, a drive device 2, a six-component force balance 3, a right-angle dynamometer 4, a hull dummy 5, a thruster model 6, a propeller model 7 and a control device. The mounting platform 1 is rigidly connected to a trailer used to tow the experimental device in the water. In this embodiment, the six-component force balance 3 is mounted on the mounting platform 1, and a frame (not shown in the figure) is provided on the upper end surface of the six-component force balance 3. The drive device 2 is mounted on the frame. In other embodiments, the drive device can also be fixedly connected to the mounting platform. In this embodiment, the six-component force balance has an intermediate cavity running through from top to bottom. The drive device 2 includes a motor 21. The output shaft of the motor 21 is horizontal. The drive device 2 also includes a vertically driven gear set. The gear set is located in a gear box 22. The gear set converts the rotation of the horizontal output shaft of the motor 21 into the rotation of the vertical axis of the gear set. The rectangular dynamometer 4 is located in the propeller cabin 62, and the part of the outer wall of the rectangular dynamometer 4 located in the propeller cabin 62 is engaged with the inner wall of the propeller cabin 62. The input end of the rectangular dynamometer 4 passes upward through the middle cavity of the six-component force balance 3 and is connected to the output shaft of the driving device 2 and rotates under the drive of the driving device 2. The part of the outer wall of the rectangular dynamometer 4 corresponding to the six-component force balance 3 is detachably fixed to the six-component force balance 3.

[0052] like Figure 2 As shown, the hull prosthesis 5 comprises a bottom plate 51 and two side plates 52. Its cross-section is U-shaped, with the opening wider than the bottom. The prosthesis's profile is aligned with the thruster-mounted portion of the hull. Each side plate 52 of the hull prosthesis 5 has a corresponding flow hole 521, one for water inlet and the other for water outlet.

[0053] like Figure 3 As shown, the thruster model 6 includes a thrust duct 61. One end of the thrust duct 61 is connected to a flow hole 521, and the other end of the thrust duct 61 is connected to another flow hole 521. The axis of the thrust duct 61 is perpendicular to the length direction of the hull prosthesis 5. The space inside the thrust duct 61 forms a thrust duct. The propeller model 7 is located in the thrust duct, and its axis coincides with or is parallel to the axis of the thrust duct 61. The shape of the propeller model 7 is as shown in FIG. Figure 4 As shown, the propeller shape is the same as that of existing ships. When the propeller model 7 rotates, a water flow field is formed in the thrust duct. Water flows in and out of the water inlet holes, thereby generating a thrust perpendicular to the length of the hull prosthesis 5, causing the hull prosthesis 5 to move in a direction perpendicular to its length.

[0054] like Figure 3As shown, the thruster model 6 also includes a propeller cabin 62 located in the thruster duct, and the rectangular dynamometer 4 is located in the propeller cabin 62. The rectangular dynamometer 4 converts the rotation of the vertical axis into the rotation of the horizontal axis (output end). The output end of the rectangular dynamometer 4 is connected to the propeller model 7 to drive the propeller model 7 to rotate.

[0055] The control device includes a speed control module, a signal acquisition module and a data analysis module. The speed control module is connected to the drive device 2 to control the driving speed of the drive device 2. The signal acquisition module collects the thrust, torque and various components of the six-component force balance 3 applied to the propeller and transmits the collected data to the data analysis module for analysis.

[0056] The hydrodynamic performance model test device for a ship thruster of the present invention does not require the manufacture of an entire ship, but rather only requires the manufacture of a dummy identical to the portion of the hull where the thruster is installed for testing. This reduces the cost of the test and, at the same time, reduces the size restrictions on the hull dummy 5. Furthermore, the dummy model retains the hull line features near the thruster and can accurately simulate the effect of this portion of the hull on the thruster's working flow field. Simultaneously, the forces acting on the other parts of the hull in different directions from the thruster are separated. The thrust, torque, and various components of the six-component force balance 3 acting on the thruster are collected by the signal acquisition module and the collected data is transmitted to the data analysis module for analysis, thereby evaluating the various performance characteristics of the thruster.

[0057] In this embodiment, the thrust duct 61 is formed by combining and fixing two half-tubes 611 that are symmetrical about a symmetry plane, and the thruster cabin 62 is formed by combining and fixing two half-cabins 621 that are symmetrical about a symmetry plane. The symmetry plane is a vertical plane passing through the axis of the thrust duct 61. One of the half-tubes 611 and one half-cabin 621 are integrally formed. In this embodiment, the two are integrally formed by 3D printing. The other half-tube 611 and the other half-cabin 621 are also integrally formed by 3D printing. Figure 3 As shown, the outer wall of each half-tube 611 is provided with a plurality of outwardly protruding protrusions 6111, each of which is provided with mounting holes 6112. After the two half-tubes 611 are assembled, one end of a bolt is passed through the corresponding protrusions 6111 of the two half-tubes 611 and engaged with a nut, thereby securing the two half-tubes 611 together to form the thruster duct 61. Simultaneously, the two half-nacelles 621 are assembled together to form the entire nacelle. This solution allows the thruster duct 61 and the thruster nacelle 62 to be opened and closed, thereby facilitating replacement of the right-angle dynamometer 4 and the propeller.

[0058] A trumpet-shaped ring 8 is fixed in each of the flow holes 521. Figure 5As shown, the trumpet ring 8 has one end with a larger opening facing outward. A grille 9 is installed within the trumpet ring 8 and is fixedly connected to the end of the hull prosthesis 5. In this embodiment, the inner wall of the flow hole 521 of the hull prosthesis 5 is internally threaded, and the trumpet ring 8 is externally threaded. The two are fixed together by threads, allowing the trumpet ring 8 to be replaced. The grille 9 and the trumpet ring 8 can also be detachably connected, allowing the grille 9 to be replaced separately. The end of the thrust duct 61 is connected to the trumpet ring 8. In this embodiment, the end of the thrust duct 61 and the trumpet ring 8 are both equipped with connecting flanges (not shown in the figure) and are connected by bolts.

[0059] In this embodiment, Figure 6 As shown, the six-component force balance 3 is also provided with a plurality of connecting holes 31 and a plurality of connecting members 32 that can pass through the connecting holes one by one. The outer wall of the right-angle dynamometer 4 is provided with a plurality of connecting recesses (not shown in the figure). After passing through the connecting holes 31, the plurality of connecting members 32 are pushed into the connecting recesses one by one.

[0060] In this embodiment, the test device also includes a connecting frame (not shown in the figure), which is fixedly connected to the two side plates 52 of the hull prosthesis 5 respectively, and the connecting frame is fixedly connected to the six-component force balance 3. In this way, the connection between the hull prosthesis 5 and the six-component force balance 3 is more stable, so that the six-direction components of the combination composed of the hull prosthesis 5, the thruster model 6, the propeller model 7, the right-angle dynamometer 4, the trumpet ring 8, the grid 9 and the drive device 2 can be measured more accurately.

[0061] The present invention also provides a method for preparing a ship thruster hydrodynamic performance model experimental device, which can be used to prepare the above-mentioned experimental device, comprising the following steps:

[0062] S1, making a ship prosthesis, a propeller model 7, a trumpet ring 8, a grille 9 and a thruster model 6;

[0063] S2, Assembly, including:

[0064] c1, install the six-component force balance 3 and the drive device 2 on the mounting stand 1, connect the input end of the right-angle dynamometer 4 to the output end of the drive device 2, and make the right-angle dynamometer 4 detachably connected to the six-component force balance 3;

[0065] c2. Connect the propeller model 7 to the output end of the right-angle dynamometer 46, install the thruster model 6, and align the thruster pod 62 of the thruster model 6 with the right-angle dynamometer 4. Securely connect the thruster duct 61 to the hull prosthesis 5. In this embodiment, installing the thruster model 6 includes: using the propeller model 7 as a reference, merging and securing the two halves of the thruster duct 61 together to form the entire thruster duct 61 and the entire thruster pod 62. The thruster pod 62 also accommodates the propeller model 7 within its cavity.

[0066] c3, rigidly connect the mounting stand 1 to the trailer, connect the speed control module to the drive device 2, and connect the data acquisition module to the six-component force balance 3 and the rectangular dynamometer 4 respectively.

[0067] This embodiment further includes the steps of securely connecting a connecting frame to the two side panels 52 of the hull prosthesis 5 and securely connecting the connecting frame to the mounting platform 1. This step can be performed after step C2. This embodiment also includes the steps of preparing the flared ring 8 and the grille 9, and installing the grille 9 and the flared ring 8. During the installation of the grille 9 and the flared ring 8, the flared ring 8 is securely connected to the thruster model 7, achieving the secure connection of the thruster duct 61 to the hull prosthesis 5 in step C2.

[0068] The ship prosthesis is made of wood or 3D printed according to the hull lines. The propeller model 7 is made of aluminum alloy by CNC machine tools. The processed propeller model 7 is surface-anodized. The trumpet ring 8 and grille 9 models are respectively 3D printed, and the propeller model is 3D printed.

[0069] The present invention also provides an experimental method for a ship thruster hydrodynamic performance model experimental device, comprising the following steps:

[0070] A. Adjust the vertical height of the mounting stand 1 so that the hull prosthesis 5 reaches the test target waterline;

[0071] B. Test system debugging and zero calibration. Generally, before starting the test, the test system will collect data in an empty space to eliminate data collection errors.

[0072] C, start the trailer and accelerate to the specified speed;

[0073] D, given the driving speed set by the driving device 2, measures the thrust, torque of the propeller model 7 and the components of force in six directions exerted on the assembly.

[0074] By varying the drive speed of the drive device 2, the thrust, torque, and six-directional force components of the propeller model 7 (i.e., the experimental device of the present invention) can be measured at different speeds. By varying the trailer speed, the thrust, torque, and six-directional force components of the propeller model 7 can be measured at different speeds. Alternatively, the propeller model 7, flared ring 8, or grille 9 can be replaced, and steps A, B, C, and D can be repeated to test the effects of different propeller models 7, flared rings 8, or grilles 9 on the propeller's thrust, torque, and six-directional force components of the assembly, thereby determining the effects of different propeller models 7, flared rings 8, and grilles 9.

[0075] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the scope of the present invention. The scope of protection of the present invention is defined by the claims. Various modifications or equivalent substitutions made by those skilled in the art within the spirit and scope of protection of the present invention also fall within the scope of protection of the present invention.

Claims

1. A model test device for hydrodynamic performance of ship thrusters, characterized in that: include: A mounting frame rigidly connected to a trailer for towing the test device in water; A six-component force balance is fixed to the mounting frame and is located below the driving device, and the six-component force balance has a middle cavity running through it from top to bottom; A driving device is fixed relative to the mounting frame and is located above the six-component force balance; A rectangular dynamometer is located in the propeller cabin, wherein a portion of the outer wall of the rectangular dynamometer located in the propeller cabin is engaged with an inner wall of the propeller cabin, an input end of the rectangular dynamometer passes upward through the middle cavity of the six-component force balance and is connected to the output shaft of the drive device, and is rotated under the drive of the drive device, and a portion of the outer wall of the rectangular dynamometer corresponding to the six-component force balance is detachably fixed to the six-component force balance; The hull prosthesis comprises a bottom plate and two side plates, wherein the line shape of the hull prosthesis is the same as the line shape of the part of the hull where the thruster is installed, and the two side plates of the hull prosthesis are respectively provided with a flow hole at a corresponding position; A thruster model includes a thruster duct, one end of the thruster duct communicating with a flow hole, and the other end of the thruster duct communicating with another flow hole. The axis of the thruster duct is perpendicular to the length direction of the hull prosthesis. The space inside the thruster duct forms a thruster duct. The thruster model also includes a thruster cabin located within the thruster duct. A propeller model is located in the thrust duct, with its axis coinciding with or parallel to the axis of the thrust duct pipe, and the output end of the rectangular dynamometer is connected to the propeller model to drive the propeller model to rotate; The control device includes a speed control module, a signal acquisition module and a data analysis module. The speed control module is connected to the motor to control the speed of the motor. The signal acquisition module collects the thrust, torque and various components of the six-component force balance applied to the propeller and transmits the collected data to the data analysis module for analysis.

2. The test device according to claim 1, characterized in that The thruster duct is composed of two half-tubes fixed together symmetrically about a symmetry plane, and the thruster cabin is composed of two half-cabins fixed together symmetrically about a symmetry plane, wherein one half-tube is integrally formed with one half-cabin, and the symmetry plane is a vertical plane passing through the axis of the thruster duct.

3. The test device according to claim 2, characterized in that The thruster duct and / or thruster cabin are formed by 3D printing.

4. The test device according to claim 2, characterized in that A trumpet-shaped ring is fixed in each of the flow holes, with one end of the trumpet ring having a larger opening facing outward. A grille is installed in the trumpet-shaped ring, and the trumpet ring is fixedly connected to the end of the hull prosthesis. The end of the side thrust duct is fixedly connected to the trumpet ring.

5. The test device according to claim 2, characterized in that The six-component force balance is also provided with a plurality of connecting holes and a plurality of connecting pieces that can pass through the connecting holes one by one. The outer wall of the right-angle dynamometer is provided with a plurality of connecting recesses. After passing through the connecting holes, the plurality of connecting pieces are pushed into the plurality of connecting recesses one by one.

6. The test device according to claim 2, characterized in that The test device further comprises a connecting frame, wherein the connecting frame is fixedly connected to the two side plates of the hull prosthesis, and the connecting frame is fixedly connected to the mounting stand.

7. A method for preparing a ship thruster hydrodynamic performance model experimental device, characterized in that: The preparation of the experimental device according to any one of claims 1 to 6 comprises the following steps: S1, making ship prosthesis, propeller model and thruster model; S2, Assembly, including: c1. Install the six-component force balance and the drive device on the mounting stand, connect the input end of the right-angle dynamometer to the output end of the drive device, and detachably connect the right-angle dynamometer to the six-component force balance; c2, connecting the propeller model to the output end of the right-angle dynamometer, installing the thruster model so that the thruster cabin of the thruster model is engaged with the right-angle dynamometer, and fixing the thruster duct to the hull prosthesis; c3, rigidly connect the mounting frame to the trailer, connect the speed control module to the drive device, and connect the data acquisition module to the six-component force balance and the right-angle dynamometer respectively.

8. The preparation method according to claim 7, characterized in that Also includes: A connecting frame is fixedly connected to both side plates of the hull prosthesis, and the connecting frame is fixedly connected to the mounting stand.

9. The preparation method according to claim 7, characterized in that It also includes the steps of preparing a trumpet ring and a grille, and installing the grille and the trumpet ring. When installing the grille and the trumpet ring, the trumpet ring is fixedly connected to the thruster model to achieve the fixed connection of the thruster duct and the prosthesis in step c2.

10. The preparation method according to claim 7, characterized in that In step 1, the ship prosthesis is made of wood or 3D printed according to the hull lines; and / or the propeller model is made of aluminum alloy by machine processing, and the processed propeller model is surface anodized; and / or the trumpet ring and grille models are respectively 3D printed; and / or the propeller model is 3D printed.

11. An experimental method for a ship thruster hydrodynamic performance model experimental device, characterized in that: An experiment is carried out using the experimental device according to any one of claims 1 to 6, The following steps are involved: A. Adjust the vertical height of the mounting platform so that the hull dummy reaches the test target waterline; B. Test system debugging and zero calibration; C, start the trailer and accelerate to the specified speed; D. Given the driving speed set by the drive device, measure the thrust, torque of the propeller model and the components of force in six directions acting on the assembly.

12. The experimental method according to claim 11, characterized in that The driving speed of the driving device is changed, and the thrust, torque and six-direction force components of the propeller model are measured; and / or the speed of the trailer is changed, and the thrust, torque and six-direction force components of the propeller model are measured.

13. The experimental method according to claim 11 or 12, characterized in that: To change the propeller model and / or flare ring and / or grille, repeat steps A, B, C, and D.

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