An underwater resistance measuring device

Abstract

The present invention belongs to the technical field of fluid resistance measurement, and particularly relates to an underwater resistance measuring device. The device comprises a box-type bluff body, a connecting mechanism, a yaw mechanism and a fixing mechanism, wherein the bottom of the connecting mechanism is connected to the box-type bluff body, the top of the connecting mechanism is connected to the yaw mechanism, the yaw mechanism is used to change the yaw angle of the box-type bluff body; the fixing mechanism is connected to the yaw mechanism, and the fixing mechanism is used to connect to an external towing device. The present invention can obtain the resistance value of the box-type bluff body at different speeds and different attitude angles through a towing test, so as to explore the relevant laws.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid resistance measurement, and in particular relates to an underwater resistance measuring device. Background Art

[0002] Resistance measurement of large-scale equipment is often difficult to carry out due to the limitation of model size. In order to predict the stress state of the actual model, the resistance measurement of the scaled model can be carried out first, and then the resistance value of the actual model can be calculated by similarity principle. This method is simple and effective, and the measurement of different models often corresponds to different measurement devices, which is time-consuming and labor-intensive, and the measurement cost is high. Summary of the invention

[0003] In view of the above problems, the purpose of the present invention is to provide an underwater resistance measuring device to solve the problem that in the existing resistance measurement process, the measurement of different models often corresponds to different measuring devices, which is time-consuming, labor-intensive and costly.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] The present invention provides an underwater resistance measuring device, comprising a box-type bluff body, a connecting mechanism, a yaw mechanism and a fixing mechanism, wherein the bottom of the connecting mechanism is connected to the box-type bluff body, the top of the connecting mechanism is connected to the yaw mechanism, the yaw mechanism is used to change the yaw angle of the box-type bluff body; the fixing mechanism is connected to the yaw mechanism, and the fixing mechanism is used to connect to an external towing device.

[0006] The box-type bluff body comprises a box-type outer shell, a tail sealing plate, a sensor fixing plate and a pressure sensor, wherein two sensor fixing plates are respectively provided at the two ends of the bottom of the box-type outer shell, two pressure sensors are respectively provided on the two sensor fixing plates, and the two pressure sensors are connected to the connecting mechanism; the tail sealing plate is used to close the box-type outer shell.

[0007] The connecting mechanism includes a water baffle and two groups of column assemblies, wherein the water baffle is connected to the upper parts of two groups of parallel column assemblies, the lower ends of the two groups of column assemblies are inserted into the box-shaped bluff body and are respectively connected to the two pressure sensors; the upper ends of the two groups of column assemblies are connected to the yaw mechanism.

[0008] The column assembly includes a towing column and a fixed shaft;

[0009] The towing column is a hollow structure, and a bottom fixing plate is provided at the lower end, and the bottom fixing plate is connected to the upper end of the pressure sensor; the upper end of the towing column is fixedly connected to the yaw mechanism;

[0010] The fixed shaft is accommodated in the towing column, and the lower end is connected to the bottom fixed plate, and the upper end passes through the yaw mechanism and is connected to the top fixed plate.

[0011] The outer surface of the towing column is provided with a spiral line.

[0012] The water retaining plate is provided with two through holes, a circular fixing card is fixed above the two through holes, the towing column passes through the circular fixing card, and the circular fixing card is fixedly connected to the towing column through a throat clamp tie.

[0013] The lower end of the towing column and the top fixing plate are both provided with threading holes.

[0014] The yaw mechanism comprises a dividing plate and a column connecting plate, wherein the column connecting plate is connected to the two groups of column assemblies, the dividing plate is arranged at the middle position of the column connecting plate, and the connecting shaft of the dividing plate is connected to the fixing mechanism.

[0015] The column connecting plate is provided with two groups of through holes arranged inside and outside;

[0016] The indexing plate is provided with two groups of connecting holes arranged inside and outside;

[0017] The yaw angle of the box-type bluff body is changed by correspondingly connecting the through holes of the column connecting plate with different connecting holes on the dividing plate.

[0018] The fixing mechanism includes a fixing plate, an aluminum profile and a square fixing card, wherein two square fixing cards are provided on the back of the fixing plate along the height direction, and the two square fixing cards are used to fix the connecting shaft of the dividing plate; an aluminum profile is provided in front of the fixing plate, and the aluminum profile is used to connect with the external dragging device.

[0019] The advantages and beneficial effects of the present invention are as follows: the underwater resistance measuring device provided by the present invention can obtain the resistance values ​​of the box-type bluff body at different speeds and different attitude angles through a towing test, thereby exploring relevant laws. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is one of the axonometric diagrams of an underwater resistance measuring device of the present invention;

[0021] Figure 2 yes Figure 1 A partial enlarged view of the middle part;

[0022] Figure 3 yes Figure 1 A partial enlarged view of point B in the middle;

[0023] Figure 4 yes Figure 1 A partial enlarged view of point C in the middle;

[0024] Figure 5 It is a front view of an underwater resistance measuring device of the present invention without a tail sealing plate;

[0025] Figure 6 yes Figure 5 A partial enlarged view of point D in the middle;

[0026] Figure 7 yes Figure 5 A partial enlarged view of point E in the middle;

[0027] Figure 8 yes Figure 5 A partial enlarged view of point F in the middle;

[0028] Fig. 9 yes Figure 5 AA section view;

[0029] Fig.10 yes Fig. 9 A partial enlarged view of the G in the middle;

[0030] Fig.11 This is the second axonometric diagram of an underwater resistance measuring device of the present invention;

[0031] Fig.12 yes Fig.11 A partial enlarged view of the H in the middle;

[0032] In the figure: 1, box-type bluff body, 1a, box-type shell, 1b, tail sealing plate, 1c, tail sealing plate screws, 1d, reinforcement plate, 1e, sensor fixing plate, 1f, pressure sensor, 1g, sensor screws, 2, connecting mechanism, 2a, towing column, 2b, water baffle, 2c, round fixing card, 2d, throat clamp tie, 2e, water baffle screws, 2f, spiral wire, 2g, bottom fixing plate, 2h, top fixing plate, 2i, fixed shaft, 2j, fixed shaft nut, 3, yaw mechanism, 3a, dividing plate, 3b, column connecting plate, 3c, dividing plate screws, 3d, support plate, 4, fixing mechanism, 4a, fixing plate, 4b, aluminum profile, 4c, square fixing card, 4d, fixing card screws, 4e, fixing plate screws. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] like Figure 1 , Figure 5 , Fig.11 As shown, the present invention provides an underwater resistance measuring device, comprising a box-type bluff body 1, a connecting mechanism 2, a yaw mechanism 3 and a fixing mechanism 4, wherein the bottom of the connecting mechanism 2 is connected to the box-type bluff body 1, the top of the connecting mechanism 2 is connected to the yaw mechanism 3, the yaw mechanism 3 is used to change the yaw angle of the box-type bluff body 1; the fixing mechanism 4 is connected to the yaw mechanism 3, and the fixing mechanism 4 is used to connect to an external towing device.

[0035] like Figure 1 , Figure 7 As shown, in the embodiment of the present invention, the box-type bluff body 1 includes a box-type outer shell 1a, a tail sealing plate 1b, a sensor fixing plate 1e and a pressure sensor 1f, wherein two sensor fixing plates 1e are respectively provided at the two ends of the bottom of the box-type outer shell 1a, and two pressure sensors 1f are respectively connected to the two sensor fixing plates 1e through sensor screws 1g, and the two pressure sensors 1f are connected to the connecting mechanism 2; the tail sealing plate 1b is used to close the box-type outer shell 1a.

[0036] Furthermore, the box-shaped housing 1a is a rectangular parallelepiped structure with rounded corners, and a plurality of reinforcing plates 1d are provided on the inner wall, the sensor fixing plate 1e is connected between two reinforcing plates 1d, and the tail sealing plate 1b is connected to the reinforcing plate 1d via the tail sealing plate screws 1c.

[0037] In this embodiment, seven reinforcing plates 1d are symmetrically distributed inside the box-shaped outer shell 1a. They are welded to the box-shaped outer shell 1a to strengthen the structural strength of the box-shaped bluff body 1 and connect the tail sealing plate 1b.

[0038] like Figure 1 , Figure 7 As shown, in an embodiment of the present invention, the connecting mechanism 2 includes a water baffle 2b and two groups of column assemblies, wherein the water baffle 2b is connected to the upper parts of two groups of parallel column assemblies, the lower ends of the two groups of column assemblies are inserted into the box-type bluff body 1, and are respectively connected to two pressure sensors 1f; the upper ends of the two groups of column assemblies are connected to the yaw mechanism 3.

[0039] Specifically, Figure 2 , Figure 6-7 As shown, the column assembly includes a towing column 2a and a fixed shaft 2i, wherein the towing column 2a is a hollow structure, and a bottom fixing plate 2g is provided at the lower end, and the bottom fixing plate 2g is connected to the upper end of the pressure sensor 1f; the upper end of the towing column 2a is fixedly connected to the yaw mechanism 3; the fixed shaft 2i is accommodated in the towing column 2a, and the lower end is connected to the bottom fixing plate 2g, and the upper end passes through the yaw mechanism 3 and is connected to the top fixing plate 2h.

[0040] Furthermore, a spiral line 2f is provided on the outer surface of the dragging column 2a, and the spiral line 2f is used to weaken the periodic force caused by the vortex shedding.

[0041] like Figure 3 , Figure 6 As shown, two through holes are provided on the water retaining plate 2b, and a circular fixing card 2c is fixed above the two through holes. The towing column 2a passes through the circular fixing card 2c, and the circular fixing card 2c is fixedly connected to the towing column 2a through a throat clamp tie 2d.

[0042] like Figure 2 , Figure 4As shown, the lower end of the towing column 2a and the top fixing plate 2h are provided with threading holes. The data line of the pressure sensor 1f passes through the hole at the intersection of the box-shaped shell 1a and the towing column 2a, enters the interior of the towing column 2a through the threading hole near the bottom fixing plate 2g of the towing column 2a, and then leaves the towing column 2a through the threading hole on the top fixing plate 2h, and finally connects to the data collector.

[0043] In this embodiment, the centerline spacing between the two towing columns 2a is approximately three-fifths of the length of the box-shaped shell 1a, and a water baffle 2b is provided at approximately one-third of the upper portion of the towing column 2a. The bottom fixing plate 2g is provided with a circle of evenly distributed holes and a central threaded hole, and the top fixing plate 2h is provided with a central hole and a threading hole. The lower end of the fixed shaft 2i is connected to the bottom fixing plate 2g by threads, and the upper end passes through the central hole of the top fixing plate 2h, and the bottom fixing plate 2g, the towing column 2a and the top fixing plate 2h are connected by two fixed shaft nuts 2j. The water baffle 2b is fixed to the towing column 2a by a circular fixing clip 2c, and the circular fixing clip 2c is fixed to the water baffle 2b by a water baffle screw 2e, and is fixed to the towing column 2a by a hose clamp tie 2d.

[0044] like Figure 1 , Figure 8 As shown, in an embodiment of the present invention, the yaw mechanism 3 includes a dividing plate 3a and a column connecting plate 3b, wherein the column connecting plate 3b is fixedly connected to the dragging column 2a in the two groups of column assemblies, the dividing plate 3a is arranged in the middle position of the column connecting plate 3b, and the connecting shaft of the dividing plate 3a is connected to the fixing mechanism 4.

[0045] Furthermore, if Figure 9-12 As shown, the column connecting plate 3b is provided with two groups of through holes arranged inside and outside; the dividing plate 3a is provided with two groups of connecting holes arranged inside and outside; by correspondingly connecting the through holes of the column connecting plate 3b and different connecting holes on the dividing plate 3a, the yaw angle of the box-type bluff body 1 is changed.

[0046] Specifically, two circles of connecting holes are staggered on the indexing plate 3a, and each circle is evenly distributed with 36 circular holes of the same size. The column connecting plate 3b is distributed with eight through holes, which can correspond to the circular holes on the indexing plate 3a and be connected through the indexing plate screws 3c. The yaw angle of the box-type bluff body 1 can be changed by correspondingly connecting the column connecting plate 3b and the different circular holes of the indexing plate 3a. The column connecting plate 3b is welded to the towing column 2a, and a circle of support plates 3d is provided at the welding point to enhance the structural strength.

[0047] like Figure 1As shown, in the embodiment of the present invention, the fixing mechanism 4 includes a fixing plate 4a, an aluminum profile 4b and a square fixing card 4c, wherein two square fixing cards 4c are provided on the back of the fixing plate 4a along the height direction, and the square fixing cards 4c are connected to the fixing plate 4a through fixing card screws 4d, and the two square fixing cards 4c are used to fix the connecting shaft of the indexing plate 3a; the front of the fixing plate 4a is connected to the aluminum profile 4b through the fixing plate screws 4e, and the aluminum profile 4b is used to connect to the external towing equipment. In this embodiment, there are fixing holes on the aluminum profile 4b, which are connected to the trailer through screws.

[0048] The present invention provides an underwater resistance measuring device. When working, the water surface is between the box-type bluff body 1 and the water retaining plate 2b. When the trailer drags the underwater resistance measuring device forward, the pressure sensor 1f inside the box-type bluff body 1 measures the axial force applied by the water flow, and then transmits the data to the collector. Changing the forward speed of the trailer can change the navigation speed of the box-type bluff body 1; when it is necessary to change the angle between the box-type bluff body 1 and the incoming flow direction, the dividing plate can be rotated as needed so that its specific circular hole corresponds to the circular hole of the column connecting plate 3b, and is fixed with screws. In this way, the resistance value of the box-type bluff body at different speeds and different attitude angles can be obtained through the towing test, and the relevant laws can be explored. Specifically, the shape and size of the box-type bluff body 1, the number and position of the reinforcing plate 1d, the length and distance of the two towing columns 2a, the model and size of the pressure sensor 1f and other parameters can be adjusted according to actual conditions.

[0049] In an embodiment of the present invention, the yaw mechanism can change the angle between the box-type bluff body and the water flow, thereby changing the resistance of the box-type bluff body. The fixing mechanism is connected to the connecting shaft of the indexing plate on the yaw mechanism, so that the top of the entire device is fixed. The underwater resistance measurement device can obtain the resistance value of the box-type bluff body at different speeds and different attitude angles through a towing test, thereby exploring related laws.

[0050] The above description is only an embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. An underwater resistance measuring device, characterized in that: The invention comprises a box-shaped bluff body (1), a connecting mechanism (2), a yaw mechanism (3) and a fixing mechanism (4), wherein the bottom of the connecting mechanism (2) is connected to the box-shaped bluff body (1), the top of the connecting mechanism (2) is connected to the yaw mechanism (3), and the yaw mechanism (3) is used to change the yaw angle of the box-shaped bluff body (1); the fixing mechanism (4) is connected to the yaw mechanism (3), and the fixing mechanism (4) is used to connect to an external towing device; The box-shaped bluff body (1) comprises a box-shaped outer shell (1a), a tail sealing plate (1b), a sensor fixing plate (1e) and a pressure sensor (1f), wherein two sensor fixing plates (1e) are respectively provided at two ends of the bottom of the box-shaped outer shell (1a), two pressure sensors (1f) are respectively provided on the two sensor fixing plates (1e), and the two pressure sensors (1f) are connected to the connecting mechanism (2); the tail sealing plate (1b) is used to seal the box-shaped outer shell (1a); The connection mechanism (2) comprises a water baffle (2b) and two groups of column assemblies, wherein the water baffle (2b) is connected to the upper parts of the two groups of parallel column assemblies, the lower ends of the two groups of column assemblies are inserted into the box-shaped bluff body (1) and are respectively connected to the two pressure sensors (1f); the upper ends of the two groups of column assemblies are connected to the yaw mechanism (3); The column assembly comprises a towing column (2a) and a fixed shaft (2i); The towing column (2a) is a hollow structure, and a bottom fixing plate (2g) is provided at the lower end, and the bottom fixing plate (2g) is connected to the upper end of the pressure sensor (1f); the upper end of the towing column (2a) is fixedly connected to the yaw mechanism (3); The fixed shaft (2i) is accommodated in the towing column (2a), and the lower end is connected to the bottom fixed plate (2g), and the upper end passes through the yaw mechanism (3) and is connected to the top fixed plate (2h); The outer surface of the towing column (2a) is provided with a spiral line (2f); The yaw mechanism (3) comprises a dividing plate (3a) and a column connecting plate (3b), wherein the column connecting plate (3b) is connected to two groups of column assemblies, the dividing plate (3a) is arranged at a middle position of the column connecting plate (3b), and the connecting shaft of the dividing plate (3a) is connected to the fixing mechanism (4).

2. The underwater resistance measuring device according to claim 1, characterized in that: The water baffle (2b) is provided with two through holes, a circular fixing clamp (2c) is fixed above the two through holes, the towing column (2a) passes through the circular fixing clamp (2c), and the circular fixing clamp (2c) is fixedly connected to the towing column (2a) via a throat clamp tie (2d).

3. The underwater resistance measuring device according to claim 1, characterized in that: The lower end of the towing column (2a) and the top fixing plate (2h) are both provided with threading holes.

4. The underwater resistance measuring device according to claim 1, characterized in that: The column connecting plate (3b) is provided with two groups of through holes arranged inside and outside; The dividing plate (3a) is provided with two groups of connecting holes arranged inside and outside; The yaw angle of the box-type bluff body (1) is changed by correspondingly connecting the through holes of the column connecting plate (3b) and different connecting holes on the dividing plate (3a).

5. The underwater resistance measuring device according to claim 1, characterized in that: The fixing mechanism (4) comprises a fixing plate (4a), an aluminum profile (4b) and a square fixing card (4c), wherein two square fixing cards (4c) are arranged on the back of the fixing plate (4a) along the height direction, and the two square fixing cards (4c) are used to fix the connecting shaft of the dividing plate (3a); and an aluminum profile (4b) is arranged on the front of the fixing plate (4a), and the aluminum profile (4b) is used to connect with the external dragging device.

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