Device and method for testing blocking effect of ship propeller

Abstract

The invention belongs to the technical field of ship experiments, and discloses a ship propeller blocking effect testing device and a testing method.The ship propeller blocking effect testing device is used for testing the propeller blocking effect of a propeller, and a plurality of connecting assemblies are slidably connected to a test bed in the vertical direction; one connecting assembly is detachably connected to a bow deck, another connecting assembly is detachably connected to a stern deck, at least one connecting assembly is detachably connected to a midship deck and avoids a bow line and a stern line of a ship model, and the foreign matter dynamic detection unit is used for tracking and reconstructing a three-dimensional motion trail of a foreign matter in real time. The flow field detection unit is used for taking a cavitation photo and a flow field photo of the propeller, the power detection unit is used for detecting the rotating speed, torque and thrust of the propeller, and the controller analyzes and evaluates the blocking effect of the propeller. According to the method for testing the blocking effect of the ship propeller, the blocking effect of the foreign matter on the ship and the propeller is truly represented by applying the testing device and considering the coupling effect of the ship, the propeller and the foreign matter.

Description

Technical Field

[0001] This invention relates to the field of ship experimental technology, and in particular to a test device and test method for ship propeller blocking effect. Background Technology

[0002] When ships navigate inland waterways or nearshore areas, they inevitably encounter foreign objects such as wood, ice, foam, and fishing nets. These objects move along the hull to the propeller area, obstructing the water flow in that area and affecting the propeller's hydrodynamic performance and operating status.

[0003] In existing technologies, cavitation tube experiments are often conducted to test the propeller blocking effect. However, it is difficult to simulate the complex working conditions of foreign objects moving with the hull, and it is also difficult to simulate the influence of the real hull on the flow field. This makes it difficult to comprehensively analyze the combined effects of blocking foreign objects on propeller hydrodynamics, cavitation characteristics, pulsating pressure and flow field. Therefore, the coupling effect of ship-propeller-foreign object must be considered in order to truly characterize the blocking effect of foreign objects on ship and propeller.

[0004] Therefore, there is an urgent need for a testing device and method for testing the blocking effect of ship propellers to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a device and method for testing the propeller blocking effect, which can simulate the complex working conditions of foreign objects moving with the ship to test the propeller blocking effect.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Firstly, a device for testing the propeller blocking effect of a ship model is provided, for testing the propeller blocking effect of a ship model, wherein the upper deck of the ship model includes a bow deck, a midship deck, and a stern deck, and the device for testing the propeller blocking effect includes:

[0008] A circulating water tank is used to provide a water flow at a preset rate;

[0009] A test bench, which is placed inside the circulating water tank;

[0010] The attitude adjustment mechanism includes multiple connecting components that are slidably connected to the test bench in a vertical direction. One of the connecting components is detachably connected to the bow deck, another connecting component is detachably connected to the stern deck, and at least one connecting component is detachably connected to the midship deck and avoids the bow-stern line of the ship model.

[0011] A foreign object release mechanism, which is installed on the test bench and is used to release foreign objects into the water flow;

[0012] The data acquisition component includes a foreign object dynamic detection unit, a flow field detection unit, and a power detection unit. The foreign object dynamic detection unit is used to track and reconstruct the three-dimensional motion trajectory of the foreign object in real time. The flow field detection unit is used to capture cavitation photos and flow field photos of the propeller. The power detection unit is used to detect the rotational speed, torque, and thrust of the propeller.

[0013] The controller is communicatively connected to the foreign object dynamic detection unit, the flow field detection unit, and the power detection unit, and is used to receive the three-dimensional motion trajectory of the foreign object, the cavitation photograph of the propeller, the speed information, torque information, and thrust information of the propeller, and analyze and calculate them to test the propeller blocking effect of the propeller of the ship model.

[0014] In some embodiments, the attitude adjustment mechanism further includes a first slide rail extending laterally along the ship model, the first slide rail being connected to the test bench, the connecting assembly including a slider and an adjusting member, the slider being slidably connected to the first slide rail, and the adjusting member being movably connected to the slider along the vertical direction and having one end detachably connected to the upper deck.

[0015] In some embodiments, the adjusting member has a rod-shaped structure and is provided with a first external thread segment and a second external thread segment in sequence along its own length direction. The upper deck has a first threaded hole corresponding to the first external thread segment. The first external thread segment is threadedly connected to the first threaded hole. The slider has a second threaded hole extending along the vertical direction. The second external thread segment is threadedly connected to the second threaded hole.

[0016] In some embodiments, the connecting assembly further includes a handwheel, which is rotatably connected to the adjusting member with its central axis as the pivot, and the pivot of the handwheel coincides with the rod axis of the adjusting member.

[0017] In some embodiments, the test bench is provided with a second slide rail extending longitudinally along the ship model, and the first slide rail is slidably connected to the second slide rail along the longitudinal direction of the ship model.

[0018] In some embodiments, the attitude adjustment mechanism further includes a first limiting member, which is fixedly connected to the first slide rail and is used to limit the maximum distance that the connecting component moves toward the bow and stern lines of the ship model. The number of the first limiting members is the same as the number of the first slide rails and they are connected in a one-to-one correspondence.

[0019] In some embodiments, the attitude adjustment mechanism includes at least one pair of connecting components detachably connected to the midship deck, the pairs of connecting components detachably connected to the midship deck being symmetrically arranged along the bow and stern lines of the model ship.

[0020] In some embodiments, the foreign object release mechanism includes a launch tube and a first electromagnetic spring. The launch tube has a launch chamber and a launch port for communicating with the outside world and the launch chamber. The first electromagnetic spring is communicatively connected to the controller and one end is connected to the bottom wall of the launch chamber.

[0021] In some embodiments, the foreign object release mechanism further includes a steering component, which is fixedly connected to the launching tube and rotatably connected to the test bench, with the axis of rotation of the steering component parallel to the vertical direction.

[0022] Secondly, a method for testing the blockage effect of a ship propeller is provided, employing the aforementioned ship propeller blockage testing device, comprising the following steps:

[0023] The model boat is placed in a circulating water tank, and its longitudinal and lateral attitudes are adjusted. The circulating water tank provides a preset flow rate, and the propeller of the model boat rotates, releasing foreign objects into the circulating water tank. The three-dimensional motion trajectory of the foreign objects is tracked and reconstructed in real time, and cavitation and flow field photos of the propeller at different phase angles are taken. The rotational speed, torque, and thrust of the propeller are detected. The blocking effect of the propeller is simulated by analyzing the three-dimensional motion trajectory of the foreign objects, the cavitation and flow field photos of the propeller, and the rotational speed, torque, and thrust information of the propeller.

[0024] The beneficial effects of this invention are:

[0025] The ship propeller blocking effect testing device provided by this invention simulates the normal sailing state of a ship on the water surface by connecting a ship model to a connecting component of an attitude adjustment mechanism, which is connected to a test bench, and placing the test bench in a circulating water tank with a preset flow rate. The connecting component is slidably connected to the test bench in the vertical direction. Two connecting components are detachably connected to the bow and stern decks of the ship model, respectively. By pressing down or lifting the bow and stern decks, the spatial position of the two connecting components in the vertical direction can be adjusted to adjust the spatial attitude of the ship model along its longitudinal direction. At least one connecting component is detachably connected to the midship deck, avoiding the bow-stern line of the ship model. By pressing down or lifting the midship deck, the spatial position of the connecting component in the vertical direction can be adjusted to adjust the ship's attitude. The model, along its own lateral spatial attitude, uses connecting components to simultaneously adjust both its lateral and longitudinal attitudes, thus simulating the hull attitude of the model under various water conditions. Foreign objects are released via a foreign object release mechanism, simulating the actual impact of various foreign objects drifting on the propeller during normal navigation. A foreign object dynamic detection unit tracks and reconstructs the three-dimensional motion trajectory of the foreign objects in real time, a flow field detection unit photographs the cavitation and flow field of the propeller, and a power detection unit detects the propeller's speed, torque, and thrust. The three-dimensional motion trajectory of the foreign objects, the cavitation and flow field photographs of the propeller, and the propeller's speed, torque, and thrust information are transmitted to the controller for analysis and calculation, thereby testing the propeller blockage effect of the model's propeller and simulating the propeller blockage effect of the ship's propeller.

[0026] The present invention provides a method for testing the ship propeller blockage effect. By applying the aforementioned ship propeller blockage effect testing device, a ship model is placed in a circulating water tank, and the longitudinal and lateral attitudes of the model are adjusted. The circulating water tank provides a preset flow rate, and the propeller of the ship model rotates, releasing foreign objects into the circulating water tank. The three-dimensional motion trajectory of the foreign object is tracked and reconstructed in real time. Cavitation and flow field photographs of the propeller at different phase angles are taken, and the propeller speed, torque, and thrust are detected. The method realistically characterizes the blockage effect of the foreign object on the ship and propeller by considering the coupling effect between the ship, propeller, and foreign object. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the ship model to be tested by the ship propeller blocking effect testing device provided in this embodiment of the invention;

[0028] Figure 2 This is a top view of the ship propeller blocking effect testing device provided in an embodiment of the present invention;

[0029] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle;

[0030] Figure 4 This is an isometric view of the ship propeller blocking effect testing device provided in the embodiment of the present invention;

[0031] Figure 5 yes Figure 4 A magnified view of a portion of point B in the middle;

[0032] Figure 6 This is an isometric view of the connecting component provided in an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the foreign object release mechanism provided in an embodiment of the present invention.

[0034] In the picture:

[0035] 100. Ship model; 101. Propeller; 102. Upper deck; 103. First threaded hole;

[0036] 1. Test bench; 11. Second slide rail;

[0037] 2. Attitude adjustment mechanism; 21. Connecting assembly; 211. Slider; 212. Adjusting component; 213. Handwheel; 22. First slide rail; 23. First limiting component;

[0038] 3. Foreign object release mechanism; 31. Launching tube; 32. First electromagnetic spring; 33. Steering component; 34. Feeding cylinder; 35. Second electromagnetic spring;

[0039] 4. Second limiting component. Detailed Implementation

[0040] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0041] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0044] Figure 1 This diagram illustrates the structure of the ship model 100 to be tested by the ship propeller blocking effect testing device provided in this embodiment of the invention. Figure 1 As shown, in order to test the actual propeller blocking effect of a ship, a ship model 100 is made by scaling down the ship body and the propeller body in proportion. The propeller blocking effect of the propeller 101 of the ship model 100 is tested to simulate the actual propeller blocking effect of the ship body.

[0045] The upper deck 102 of a ship, also known as the main deck, is the highest continuous open deck of the ship. It is divided into the bow deck, the midship deck, and the stern deck along the longitudinal direction of the ship. The bow deck is a part of the upper deck 102 corresponding to the bow position, the midship deck is a part of the upper deck 102 corresponding to the midship position, and the stern deck is a part of the upper deck 102 corresponding to the stern position. The division of the three along the longitudinal length of the ship is not strictly limited, and those skilled in the art can reasonably set it according to actual needs, which will not be elaborated here.

[0046] Figure 2 A top view of the ship propeller blocking effect testing device provided in this embodiment is shown. Figure 3 It shows Figure 2 A magnified view of a portion of point A in the middle. Figure 4 An isometric view of the ship propeller blocking effect testing device provided in this embodiment is shown. Figure 5 It shows Figure 4 A magnified view of a portion at point B. (See diagram below.) Figures 1 to 5As shown, the ship propeller blocking effect testing device provided in this embodiment is used to test the propeller blocking effect of the propeller 101 of the ship model 100. The ship propeller blocking effect testing device includes a circulating water tank (not shown in the figure), a test bench 1, an attitude adjustment mechanism 2, a foreign object release mechanism 3, a data acquisition component (not shown in the figure), and a controller (not shown in the figure). The circulating water tank is used to provide water flow at a preset velocity. The test bench 1 is placed in the circulating water tank. The attitude adjustment mechanism 2 includes multiple connecting components 21 that are slidably connected to the test bench 1 in the vertical direction. One connecting component 21 is detachably connected to the bow deck, another connecting component 21 is detachably connected to the stern deck, and at least one connecting component 21 is detachably connected to the midship deck and avoids the bow-stern line of the ship model 100. The foreign object release mechanism 3 is installed on the test bench 1 and is used to release foreign objects into the water flow in the circulating water tank. The data acquisition components include a foreign object dynamic detection unit, a flow field detection unit, and a power detection unit. The foreign object dynamic detection unit is used to track and reconstruct the three-dimensional motion trajectory of the foreign object in real time. The flow field detection unit is used to take cavitation and flow field photos of the propeller 101. The power detection unit is used to detect the rotational speed, torque, and thrust of the propeller 101. The controller is communicatively connected to the foreign object dynamic detection unit, the flow field detection unit, and the power detection unit, respectively, to receive the three-dimensional motion trajectory of the foreign object, the cavitation and flow field photos of the propeller 101, and the rotational speed, torque, and thrust information of the propeller 101, and to analyze and calculate them to test the propeller blocking effect of the propeller 101 of the model ship 100.

[0047] The ship propeller blocking effect testing device provided in this embodiment simulates the normal sailing state of a ship on the water surface by connecting the ship model 100 to the connecting component 21 of the attitude adjustment mechanism 2, which is connected to the test bench 1, and placing the test bench 1 in a circulating water tank with a preset flow rate. The connecting component 21 is slidably connected to the test bench 1 in the vertical direction. The two connecting components 21 are detachably connected to the bow deck and stern deck of the ship model 100, respectively. By pressing down or lifting the bow deck and stern deck of the ship model 100, the spatial position of the two connecting components 21 in the vertical direction can be adjusted to adjust the spatial attitude of the ship model 100 along its own longitudinal direction. At least one connecting component 21 is detachably connected to the midship deck, avoiding the bow-stern line of the ship model 100. By pressing down or lifting the midship deck of the ship model 100, the spatial position of the connecting component 21 in the vertical direction can be adjusted to adjust the ship's attitude. Model 100 adjusts its lateral and longitudinal attitudes simultaneously using connecting component 21 along its own lateral spatial orientation, thereby simulating the hull attitude of model 100 under various water conditions. Foreign objects are released through foreign object release mechanism 3 to simulate the actual impact of various foreign objects drifting on the water surface on propeller 101 during normal navigation of model 100. The foreign object dynamic detection unit tracks and reconstructs the three-dimensional motion trajectory of the foreign object in real time, the flow field detection unit takes pictures of the cavitation and flow field of propeller 101, and the power detection unit detects the rotational speed, torque, and thrust of propeller 101. The three-dimensional motion trajectory of the foreign object, the cavitation and flow field pictures of propeller 101, and the rotational speed, torque, and thrust information of propeller 101 are transmitted to the controller for analysis and calculation, thereby testing the propeller blocking effect of propeller 101 of model 100, and thus simulating the propeller blocking effect of the propeller body of the ship.

[0048] It should be noted that the foreign object dynamic monitoring unit provided in this embodiment is a high-speed camera. The high-speed camera has a shooting frequency of not less than 1000 frames / second and can track and reconstruct the three-dimensional motion trajectory of the foreign object released by the foreign object release mechanism 3 and falling into the circulating water tank in real time. As for the number and installation position of the high-speed camera, those skilled in the art can set it reasonably according to actual needs, and it will not be described in detail here.

[0049] It should be noted that the flow field detection unit provided in this embodiment includes a PIV (Particle Image Velocimeter), an LDV (Laser Doppler Velocimeter), a pressure sensor array, a stroboscope, and a high-speed camera. The PIV adjusts the laser power, the high-speed camera sets the corresponding resolution, the pressure sensor array consists of no fewer than five pressure sensors, and the frequency of the stroboscope is linked to the rotational speed of the propeller 101 to capture cavitation images and flow field images of the propeller 101 at different phase angles. As for the installation positions of each component of the flow field detection unit, the laser power of the PIV, the resolution of the high-speed camera, the number of pressure sensors in the pressure sensor array, and the linkage between the frequency of the stroboscope and the rotational speed of the propeller 101, those skilled in the art can reasonably set them according to actual needs, and will not be elaborated here.

[0050] It should be noted that the power detection unit provided in this embodiment is a speed and torque measuring instrument. The speed and torque measuring instrument adopts strain gauge or piezoelectric sensor and can measure the speed, torque and thrust information of propeller 101 in real time.

[0051] It should be noted that the controller provided in this embodiment includes a data acquisition card, an image processing chip, a motion analysis chip, and a host computer, which can analyze and test the propeller blocking effect of the propeller 101 based on the three-dimensional motion trajectory of the foreign object, the cavitation photograph of the propeller, and the rotational speed and torque of the propeller 101.

[0052] Figure 6 This is an isometric view of the connecting component 21 provided in an embodiment of the present invention. Figure 2 , Figure 3 and Figure 6 As shown, the attitude adjustment mechanism 2 also includes a first slide rail 22 extending laterally along the ship model 100. The first slide rail 22 is connected to the test bench 1. The connecting component 21 includes a slider 211 and an adjusting member 212. The slider 211 is slidably connected to the first slide rail 22, and the adjusting member 212 is movably connected to the slider 211 in the vertical direction, with one end detachably connected to the upper deck 102. The first slide rail 22 and the connecting component 21 are correspondingly arranged and connected. This allows the connecting component 21, which is detachably connected to the midship deck, to move laterally along the ship model 100, pressing down or raising the midship deck to different positions in the lateral direction of the ship model 100, so as to simulate different lateral attitudes of the ship model 100. Specifically, the slider 211 has a sliding hole extending in the vertical direction, and the first slide rail 22 is inserted into the sliding hole, thereby realizing the sliding connection between the slider 211 and the first slide rail 22.

[0053] Preferably, the slider 211 is further provided with a first threaded hole, and the connecting component 21 also includes a first locking bolt. The first threaded hole faces the rail surface of the first slide rail 22. The first locking bolt is threadedly connected to the first slide rail 22, so that the first locking bolt can be screwed on to press down on the rail surface of the first slide rail 22. When the data acquisition component tracks and reconstructs the three-dimensional motion trajectory of the foreign object in real time, takes pictures of the cavitation of the propeller 101, and detects the rotational speed and torque of the propeller 101, it can prevent the ship model 100 from sliding laterally, thereby improving the accuracy of data acquisition by the data acquisition component.

[0054] like Figure 1 , Figure 2 , Figure 3 and Figure 6 As shown, the adjusting member 212 has a rod-shaped structure and is provided with a first external thread section and a second external thread section in sequence along its own length direction. The upper deck 102 has a first threaded hole 103 corresponding to the first external thread section. The first external thread section is threadedly connected to the first threaded hole 103. The slider 211 has a second threaded hole extending in the vertical direction. The second external thread section is threadedly connected to the second threaded hole. Thus, the adjusting member 212 can be turned to press down or lift up the upper deck 102 of the ship model 100, thereby adjusting the lateral and longitudinal attitude of the ship model 100.

[0055] Preferably, the connecting assembly 21 further includes a handwheel 213, which is rotatably connected to the adjusting member 212 with its central axis as the pivot. The pivot of the handwheel 213 coincides with the rod axis of the adjusting member 212, so that the operator can rotate the handwheel 213 to turn the adjusting member 212, thereby adjusting the lateral and longitudinal attitude of the ship model 100 and improving the ease of operation for adjusting the attitude of the ship model 100.

[0056] like Figure 2 As shown, the test bench 1 is provided with a second slide rail 11 extending longitudinally along the ship model 100. The first slide rail 22 is slidably connected to the second slide rail 11 along the longitudinal direction of the ship model 100, thereby changing the position of the connecting component 21 in the longitudinal direction of the ship model 100. When facing ship models 100 of different specifications, the connecting component 21 can change its spatial position in the longitudinal direction of the ship model 100 so as to connect with the upper deck 102 of the ship model 100, thereby connecting the ship model 100 to the test device.

[0057] like Figure 2 and Figure 6The attitude adjustment mechanism 2 includes at least one pair of detachable connecting components 21 attached to the midship deck. These pairs of detachable connecting components 21 are symmetrically arranged along the bow and stern lines of the model ship 100, allowing the connecting components 21 to simultaneously press down or lift the ship on both sides of the bow and stern lines, thus facilitating the adjustment of the model ship 100's lateral attitude. It should be noted that the number of pairs of detachable connecting components 21 attached to the midship deck is not limited here; it can be one, two, three, or even more pairs, allowing for multi-point lifting or pressing down of the midship deck of the model ship 100, thereby more precisely adjusting the lateral spatial attitude of the model ship 100.

[0058] In this embodiment, the attitude adjustment mechanism 2 includes three pairs of detachable connecting components 21 connected to the midship deck. The pairs of detachable connecting components 21 are symmetrically arranged along the bow and stern lines of the ship model 100, so that the midship deck of the ship model 100 can be raised or lowered at six points at the same time, thereby adjusting the lateral spatial attitude of the ship model 100 more accurately.

[0059] like Figure 2 and Figure 3 As shown, the attitude adjustment mechanism 2 also includes a first limiting member 23. The first limiting member 23 is fixedly connected to the first slide rail 22 and is used to limit the maximum distance that the connecting component 21 moves towards the bow and stern lines of the ship model 100. The number of first limiting members 23 and the number of first slide rails 22 are the same and they are connected one-to-one, thereby preventing the connecting component 21 from sliding along the first slide rail 22 to the bow and stern lines of the ship model 100 and applying pressure or lifting to the bow and stern lines of the ship model 100, which would prevent the lateral attitude of the ship model 100 from being adjusted. It should be noted that the connecting component 21, which is detachably connected to the midship deck, does not change the lateral attitude of the ship model 100 by pressing down or lifting the bow and stern lines.

[0060] Preferably, the ship propeller blocking effect testing device further includes a second limiting member 4, which is fixedly connected to the second slide rail 11 and is used to limit the maximum distance that the first slide rail 22 slides along the second slide rail 11, thereby preventing the first slide rail 22 from slipping off the second slide rail 11.

[0061] Figure 7 A schematic diagram of the foreign object release mechanism 3 provided in this embodiment is shown. Figure 4 , Figure 5 and Figure 7As shown, the foreign object release mechanism 3 includes a launch tube 31 and a first electromagnetic spring 32. The launch tube 31 has a launch chamber and a launch port for connecting the outside world with the launch chamber. The first electromagnetic spring 32 is communicatively connected to the controller and one end is connected to the bottom wall of the launch chamber. Thus, when conducting a propeller blockage effect test, a foreign object can be placed in the launch chamber and contact the first electromagnetic spring 32. The controller can control the first electromagnetic spring ejection 32 to extend and release the foreign object, so as to simulate a foreign object.

[0062] Continue as Figure 4 , Figure 5 and Figure 7 As shown, the foreign object release mechanism 3 also includes a steering component 33, which is fixedly connected to the launch tube 31 and rotatably connected to the test bench 1. The axis of rotation of the steering component 33 is parallel to the vertical direction, thereby controlling the release angle of the foreign object relative to the propeller 101, so as to better simulate the actual impact of various foreign objects drifting on the water surface on the propeller 101.

[0063] Preferably, the foreign object release mechanism 3 further includes a feeding cylinder 34 and a second electromagnetic spring 35. The feeding cylinder 34 has a material receiving cavity with a feeding port that can communicate with the launching cylinder 31. The second electromagnetic spring 35 is fixedly connected to the material receiving cavity and communicates with the controller. The second electromagnetic spring 35 faces the feeding port, so that foreign objects can be placed in the material receiving cavity. When it is necessary to feed material into the launching chamber of the launching cylinder 31, the controller can control the second electromagnetic spring 35 to be energized, so that the second electromagnetic spring 35 is ejected and extended, thereby ejecting the foreign object into the launching chamber, realizing automatic feeding of the feeding cylinder 34.

[0064] Preferably, the foreign object release mechanism 3 is installed on the test bench 1 and located at the bow or midship position of the ship model 100. Thus, when the foreign object is released by the foreign object release mechanism 3, the foreign object is located at the bow or midship position of the ship model 100, thereby better simulating the actual working condition of the foreign object drifting from the water surface corresponding to the bow or midship position of the ship model 100 towards the propeller 101 during the ship's navigation.

[0065] The boat model 100 is placed in a circulating water tank, and its longitudinal and lateral attitudes are adjusted. The circulating water tank provides a preset flow rate, and the propeller 101 of the boat model 100 rotates, releasing foreign objects into the circulating water tank. The three-dimensional motion trajectory of the foreign objects is tracked and reconstructed in real time, and cavitation and flow field photos of the propeller 101 at different phase angles are taken. The rotational speed, torque, and thrust of the propeller 101 are detected. The blocking effect of the propeller 101 is simulated by analyzing the three-dimensional motion trajectory of the foreign objects, the cavitation and flow field photos of the propeller 101, and the rotational speed, torque, and thrust information of the propeller 101.

[0066] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A device for testing the propeller blocking effect of a ship model (100), used to test the propeller blocking effect of the propeller (101) of a ship model (100), wherein the upper deck (102) of the ship model (100) includes a bow deck, a midship deck, and a stern deck, characterized in that, The ship propeller blocking effect testing device includes: A circulating water tank is used to provide a water flow at a preset rate; Test bench (1), the test bench (1) is placed in the circulating water tank; The attitude adjustment mechanism (2) includes a plurality of connecting components (21) that are slidably connected to the test bench (1) in the vertical direction. One of the connecting components (21) is detachably connected to the bow deck, another connecting component (21) is detachably connected to the stern deck, and at least one connecting component (21) is detachably connected to the midship deck and avoids the bow-stern line of the ship model (100). Foreign object release mechanism (3), which is installed on the test bench (1) and is used to release foreign objects into the water flow; The data acquisition component includes a foreign object dynamic detection unit, a flow field detection unit, and a power detection unit. The foreign object dynamic detection unit is used to track and reconstruct the three-dimensional motion trajectory of the foreign object in real time. The flow field detection unit is used to capture cavitation photos and flow field photos of the propeller (101). The power detection unit is used to detect the rotational speed, torque, and thrust of the propeller (101). The controller is communicatively connected to the foreign object dynamic detection unit, the flow field detection unit and the power detection unit, respectively, and is used to receive the three-dimensional motion trajectory of the foreign object, the cavitation photograph of the propeller (101), the rotational speed information, torque information and thrust information of the propeller (101) and analyze and calculate them to test the propeller blocking effect of the propeller (101) of the ship model (100).

2. The ship propeller blocking effect testing device according to claim 1, characterized in that, The attitude adjustment mechanism (2) further includes a first slide rail (22) extending laterally along the ship model (100), the first slide rail (22) being connected to the test bench (1), the connecting assembly (21) including a slider (211) and an adjusting member (212), the slider (211) being slidably connected to the first slide rail (22), and the adjusting member (212) being movably connected to the slider (211) along the vertical direction and having one end detachably connected to the upper deck (102).

3. The ship propeller blocking effect testing device according to claim 2, characterized in that, The adjusting member (212) has a rod-shaped structure and is provided with a first external thread section and a second external thread section in sequence along its own length direction. The upper deck (102) is provided with a first threaded hole (103) corresponding to the first external thread section. The first external thread section is threadedly connected to the first threaded hole (103). The slider (211) is provided with a second threaded hole extending along the vertical direction. The second external thread section is threadedly connected to the second threaded hole.

4. The ship propeller blocking effect testing device according to claim 3, characterized in that, The connecting assembly (21) also includes a handwheel (213), which is rotatably connected to the adjusting member (212) with its central axis as the pivot. The pivot of the handwheel (213) coincides with the rod axis of the adjusting member (212).

5. The ship propeller blocking effect testing device according to claim 2, characterized in that, The test bench (1) is provided with a second slide rail (11) extending longitudinally along the ship model (100), and the first slide rail (22) is slidably connected to the second slide rail (11) along the longitudinal direction of the ship model (100).

6. The ship propeller blocking effect testing device according to claim 5, characterized in that, The attitude adjustment mechanism (2) further includes a first limiting member (23), which is fixedly connected to the first slide rail (22) and is used to limit the maximum distance that the connecting component (21) moves toward the bow and stern lines of the ship model (100). The number of the first limiting members (23) is the same as that of the first slide rail (22) and they are connected in a one-to-one correspondence.

7. The ship propeller blocking effect testing device according to any one of claims 1-6, characterized in that, The attitude adjustment mechanism (2) includes at least one pair of connecting components (21) detachably connected to the midship deck. The pair of connecting components (21) detachably connected to the midship deck are symmetrically arranged along the bow and stern lines of the ship model (100).

8. The ship propeller blocking effect testing device according to any one of claims 1-6, characterized in that, The foreign object release mechanism (3) includes a launch tube (31) and a first electromagnetic spring (32). The launch tube (31) has a launch chamber and a launch port for connecting the outside world with the launch chamber. The first electromagnetic spring (32) is communicatively connected to the controller and one end is connected to the bottom wall of the launch chamber.

9. The ship propeller blocking effect testing device according to claim 8, characterized in that, The foreign object release mechanism (3) also includes a steering component (33), which is fixedly connected to the launch tube (31) and rotatably connected to the test bench (1). The axis of rotation of the steering component (33) is parallel to the vertical direction.

10. A method for testing the blockage effect of a ship propeller, using the ship propeller blockage testing apparatus as described in any one of claims 1-9, characterized in that, Includes the following steps: The model boat (100) is placed in a circulating water tank and its longitudinal and lateral attitudes are adjusted. The circulating water tank provides a preset flow rate. The propeller (101) of the model boat (100) rotates and releases foreign objects into the circulating water tank. The three-dimensional motion trajectory of the foreign objects is tracked and reconstructed in real time. Cavitation photos and flow field photos of the propeller (101) at different phase angles are taken. The rotational speed, torque and thrust of the propeller (101) are detected. The blocking effect of the propeller (101) is simulated by analyzing the three-dimensional motion trajectory of the foreign objects, the cavitation photos and flow field photos of the propeller (101), and the rotational speed, torque and thrust of the propeller (101).

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