Circulation test water tank pushed by propeller array and configuration method

Abstract

The invention discloses a circulation test water tank pushed by a propeller array and a configuration method. The circulation test water tank comprises a water tank body of an annular structure, and a transparent visual test section is arranged on the water tank body; a plurality of groups of main propellers and an adjusting propeller are arranged in the water tank body, the adjusting propeller is arranged at the starting position of the visual test section, each of the main propellers and the adjusting propeller comprises a plurality of propellers which are uniformly arranged in an array on the same water flow section, and uniform driving force is provided for water flow through the propellers; the main force thruster and the adjusting thruster are connected with a thruster control system, and the thruster control system independently controls motor output power of all propellers. The water tank body only needs one-time water injection, the propeller is adopted to provide circulating power for water flow after water injection, water flow recycling is achieved, the water tank test cost can be reduced, meanwhile, flow velocity distribution of all areas of the water flow section can be changed, and all-dimensional visualization of the test section is achieved.

Description

Technical Field

[0001] The invention belongs to the field of hydrodynamic tests, and in particular relates to a circulating test water tank driven by a propeller array and a configuration method thereof. Background Art

[0002] In the field of hydraulics, flume tests are the most common test method used to study hydraulic and hydrological problems in water conservancy construction projects such as bridge engineering, coastal engineering, dam design, port shipping and river management. They are an important means to understand hydrodynamic processes, verify theoretical models and optimize design solutions. Researchers can simulate various hydrodynamic scenarios in real hydrological environments by controlling flume inclination, flow rate, flow velocity and other parameters, thereby evaluating the feasibility and effectiveness of different engineering solutions.

[0003] However, existing water tank test equipment has the following problems: (1) The equipment has high manufacturing, use and maintenance costs, requires a large amount of water resources and energy, and cannot achieve energy conservation and environmental protection; (2) The function is relatively simple and the scope of application is narrow. Generally, parameters are only adjusted in a single field, and it is difficult to promote it to other fields for experimental research; (3) The flow velocity distribution cannot be adjusted at will. The existing water tank test equipment can only control the size of the overall flow velocity and cannot adjust the flow velocity of a certain area within the cross section separately; (4) It is difficult to observe and feedback in real time. The observation capability of the existing water tank test equipment is limited. Only some observation windows can be set and the line of sight is easily blocked by fixed objects, making it impossible to conduct comprehensive real-time observation of the overall water flow dynamic response. Summary of the invention

[0004] The purpose of the present invention is to address the problems in the above-mentioned prior art and provide a circulating test water tank driven by a propeller array and a configuration method, which can reduce the cost of water tank testing, recycle water flow, avoid wasting water resources and energy, and at the same time change the flow velocity distribution of each area of ​​the water flow cross-section and realize all-round visualization of the test section.

[0005] In order to achieve the above object, the present invention has the following technical solutions:

[0006] A circulating test water tank driven by a propeller array comprises a water tank body of an annular structure, on which a transparent visual test section is arranged; a main propeller and an adjusting propeller are arranged inside the water tank body, the main propeller is provided with a plurality of groups, and the adjusting propeller is arranged at the beginning of the visual test section, the main propeller and the adjusting propeller both comprise a plurality of propellers uniformly arranged in an array on the same water flow section, and the propellers provide uniform driving force for the water flow; the main propeller and the adjusting propeller are connected to a propeller control system, and the propeller control system controls the motor output power of each propeller individually.

[0007] As a preferred solution, the annular water tank body includes a long straight section and an arc section. The visualization test section and the adjustment propeller are arranged on the long straight section on one side, and the main propeller is arranged on the long straight section on the other side.

[0008] As a preferred solution, a rectifying grid for stabilizing turbulent water flow is provided between the regulating propeller and the visualization test section.

[0009] As a preferred solution, the rectifying grid adopts a PVC round hole grid, and the aperture, depth and wall thickness of the PVC round hole grid are designed according to test requirements.

[0010] As a preferred solution, the sink body is installed on a sink base, and the sink base adopts a multi-point support design, so that the height of the sink body at different positions can be leveled at multiple points through the sink base.

[0011] As a preferred solution, the entire water tank body is made of stainless steel and is provided with a plurality of transverse force-bearing rods at intervals. The visualization test section is made of acrylic material. The visualization test section and the water tank body are fixed with stainless steel bolts and structural adhesive.

[0012] As a preferred solution, the main thruster and the regulating thruster have the same structure, both comprising several groups of thruster frames and U-shaped stainless steel profiles with holes. The same group of thruster frames and U-shaped stainless steel profiles with holes are combined to form a self-limiting stable triangular structure. The several groups of thruster frames and U-shaped stainless steel profiles with holes are fixed together by transverse connecting profiles; several propellers are installed on the thruster frames to form a uniform array arrangement in the same water flow section.

[0013] As a preferred solution, the propeller is driven by a brushless motor with a low KV value and waterproof treatment, and a fairing is provided outside the propeller.

[0014] As a preferred solution, the thruster control system uses a digital controller to transmit a control signal to the electronic speed regulator, thereby controlling the speed and power of the brushless motor of each propeller; connecting the brushless motor of each propeller to a different control route to form a separate control route; or, connecting the brushless motor of each propeller to the same control route for synchronous adjustment.

[0015] A method for configuring a circulating test water tank driven by the propeller array, comprising:

[0016] First, the main propeller in the water tank on the opposite side of the visualization test section provides uniform thrust to push the water flow to the set speed. After the water flow reaching the set speed enters the water tank on one side of the visualization test section, the propeller control system individually controls the output power of each propeller motor of the adjusting propeller, and then, at the beginning of the visualization test section, the water flow is compensated for flow velocity or the flow field is adjusted to form a stable, uniform or non-uniform flow field required for the test in the visualization test section.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] The water tank body adopts an annular structure, which only needs to be filled with water once, without the need for a continuous water source. After the water is filled, a propeller is used to provide circulating power for the water flow, so as to realize the recycling of the water flow and avoid the waste of water resources and energy. Through the reasonable design of the overall structure and the fixing method of the combined section, a transparent visualization test section is set on the water tank body, and the visualization test section is used to realize the full visualization of the test section, which provides a good visual basis for the real-time observation of the test phenomenon. In addition, the water flow propeller is innovatively designed, and the propeller adopts an array layout. Several propellers are arranged in an even array on the same water flow section to provide uniform and stable thrust, and the flow velocity distribution in each area of ​​the water flow section can be changed according to the test requirements by adjusting the motor control of a single propeller in the propeller. The circulating test water tank driven by the propeller array of the present invention has the advantages of energy saving and environmental protection, resource conservation, full visualization of the test section, stable flow field and arbitrary adjustment, etc. The water flow can be recycled to avoid the waste of water resources and energy, and can provide an important reference for the engineering design and construction in the fields of water conservancy engineering and bridge engineering.

[0019] Furthermore, the main thruster and the regulating thruster of the present invention both include several groups of thruster frames and U-shaped stainless steel profiles with holes. The same group of thruster frames and U-shaped stainless steel profiles with holes are combined to form a self-limiting and stable triangular structure. The several groups of thruster frames and U-shaped stainless steel profiles with holes are fixed together by transverse connecting profiles. The thruster frames can achieve self-limiting in the water tank body while meeting the requirements of being thin and having high rigidity. They are firm, stable, adjustable, and have a small water-blocking area. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The overall structural schematic diagram of the circulating test water tank driven by the propeller array of the present invention;

[0021] FIG. 2( a ) is a schematic front view of a circulating test water tank driven by a propeller array of the present invention;

[0022] FIG2( b ) is a schematic left side view of a circulating test water tank driven by a propeller array of the present invention;

[0023] FIG2( c ) is a top view of a circulating test water tank driven by a propeller array of the present invention;

[0024] Figure 3 A schematic diagram of the structure of the water tank body and water tank base of the circulating test water tank driven by the propeller array of the present invention;

[0025] Figure 4 A schematic diagram of the structure of a visualized test section of a circulating test water tank driven by a propeller array of the present invention;

[0026] Figure 5 A schematic diagram of the structure of the main propeller and the regulating propeller of the circulating test water tank driven by the propeller array of the present invention;

[0027] Figure 6 A schematic diagram of the propeller control system architecture of a circulating test water tank driven by a propeller array of the present invention;

[0028] FIG. 7( a ) is a schematic diagram of the flow rate test section position of a circulating test water tank driven by a propeller array of the present invention;

[0029] FIG7( b ) is a schematic diagram of the arrangement of flow velocity measurement points of a circulating test water tank driven by a propeller array of the present invention;

[0030] FIG8(a) is a diagram showing the effect of adjusting the front section flow velocity distribution of the circulating test water tank configuration method driven by the propeller array of the present invention;

[0031] FIG8( b ) is a diagram showing the cross-sectional flow velocity distribution effect after adjustment of the configuration method of the circulating test water tank driven by the propeller array of the present invention;

[0032] FIG8(c) is a lateral distribution diagram of flow velocity at 1 / 2 water depth of a circulating test water tank configuration method driven by a propeller array of the present invention;

[0033] In the attached figure: 1-water tank body; 2-visualization test section; 3-rectifier grid; 4-water tank base; 5-thruster control system; 6-main thruster; 7-adjusting thruster; 8-thruster frame; 9-propeller; 10-U-shaped stainless steel profile with holes. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0035] See also Figure 1 and Figure 2(a) to Figure 2(c)The embodiment of the present invention proposes a circulating test water tank driven by a propeller array, including a water tank body 1 with an annular structure, and a transparent visual test section 2 is arranged on the water tank body 1; a main propeller 6 and an adjusting propeller 7 are arranged inside the water tank body 1, and the main propeller 6 is provided with several groups, and the adjusting propeller 7 is arranged at the beginning of the visual test section 2. The main propeller 6 and the adjusting propeller 7 both include several propellers 9 uniformly arranged in an array on the same water flow section, and the propellers 9 provide uniform driving force for the water flow; the main propeller 6 and the adjusting propeller 7 are connected to a propeller control system 5, and the propeller control system 5 controls the motor output power of each propeller 9 separately.

[0036] In a possible implementation, the annular water tank body 1 of the embodiment of the present invention includes a long straight section and an arc section. The visualization test section 2 and the adjustment propeller 7 are arranged on the long straight section on one side, and the main propeller 6 is arranged on the long straight section on the other side. Figure 3 as well as Figure 4 The opening in the middle area of ​​the straight section on one side of the water tank body 1 is used to install the visualization test section 2. The visualization test section 2 is made of high-transparency material, and the water tank body 1 can be made of other materials according to the strength and stiffness requirements. At the same time, stiffening ribs are set, and transverse force rods are installed at the key stress-bearing parts. The connection between the visualization test section 2 and the water tank body 1 can be fixed with stainless steel bolts and structural adhesive.

[0037] In a possible implementation, a rectifying grid 3 for stabilizing turbulent water flow is provided between the regulating propeller 7 and the visualization test section 2 in the embodiment of the present invention. Furthermore, the rectifying grid 3 adopts a PVC round hole grid, and the aperture, depth and wall thickness of the PVC round hole grid are designed according to the test requirements. In this embodiment, the aperture is 4 cm, the depth is 10 cm, and the wall thickness is 1 mm.

[0038] In a possible implementation, in order to adapt to complex terrain environments and ensure the level of the liquid level in the water tank, the water tank body 1 of the embodiment of the present invention is installed on the water tank base 4. The water tank base 4 adopts a multi-point support design, and the height of the water tank body 1 at different positions is leveled at multiple points through the water tank base 4, while providing sufficient bearing capacity. The main material of the water tank base 4 of the embodiment of the present invention is a stainless steel square tube.

[0039] In a possible implementation, the water tank body 1 of this embodiment is made of stainless steel as a whole and is reinforced, and the visualization test section 2 is made of acrylic material with high transparency, light weight and high strength; the visualization test section 2 and the water tank body 1 are fixed with stainless steel bolts and structural adhesive.

[0040] See also Figure 5In a possible implementation, the main propeller 6 and the regulating propeller 7 have the same structure, both including several groups of propeller skeletons 8 and U-shaped stainless steel profiles 10 with holes. The same group of propeller skeletons 8 and U-shaped stainless steel profiles 10 with holes are combined to form a self-limiting stable triangular structure. The several groups of propeller skeletons 8 and U-shaped stainless steel profiles 10 with holes are fixed together by transverse connecting profiles; several propellers 9 are installed on the propeller skeleton 8 to form a uniform array arrangement in the same water flow section. The main propeller 6 is arranged at the long straight section of the water tank body 1 on the opposite side of the visualization test section 2, and the regulating propeller 7 is arranged at the beginning of the long straight section of the water tank body 1 on one side of the visualization test section 2. The propeller skeleton 8 of this embodiment is made of thin and rigid materials. The propeller skeleton 8 can realize self-limiting in the water tank body 1 while meeting the requirements of thinness and rigidity. It can be adjusted at will according to the test requirements. It is firm, stable, adjustable, and has a small water blocking area.

[0041] See also Figure 6 In a possible implementation, the propeller 9 of the embodiment of the present invention is driven by a brushless motor with a low KV value and waterproof treatment, and a fairing is provided outside the propeller 9. The propeller control system 5 uses a digital controller to send a control signal to the electronic speed regulator, thereby controlling the speed and power of the brushless motor of each propeller 9; the brushless motor of each propeller 9 is connected to a different control route to form a separate control route; or, the brushless motor of each propeller 9 can be connected to the same control route for synchronous adjustment.

[0042] Another embodiment of the present invention further provides a method for configuring a circulating test water tank driven by a propeller array, comprising:

[0043] First, the main propeller 6 in the water tank body 1 on the opposite side of the visualization test section 2 provides uniform thrust to push the water flow to a set speed;

[0044] Then, when the water flow reaches the set speed and enters the water tank body 1 on one side of the visualization test section 2, the propeller control system 5 individually controls the output power of each propeller 9 motor of the adjusting propeller 7, and then compensates the flow velocity or adjusts the flow field of the water flow at the beginning of the visualization test section 2, so as to form a stable, uniform or non-uniform flow field required for the test in the visualization test section 2.

[0045] In another embodiment, the bottom and two side surfaces of the water tank body 1 are laser welded with stainless steel plates with a thickness of 4 mm, stainless steel square tubes are welded at the upper and lower edges of the outer side, and stiffening ribs are arranged at intervals and welded with the upper and lower tubes and the tank body to provide sufficient rigidity. A 1.5m space is reserved in the middle of the long straight section on one side for the installation of the visualization test section 2. The three stainless steel plates extend 5 cm and reserve 2 rows of screw holes, such as Figure 3 shown.

[0046] Visual test section 2 uses three-sided acrylic plexiglass plates with a thickness of 8mm. The bottom plate of the water tank body 1 is grooved on both sides. After applying structural glue, the two side plates are inserted into the grooves and fixed. The two ends of the visual test section 2 are thinned and screw holes are reserved. Figure 4 As shown, the visualization test section 2 and the water tank body 1 are fixed by stainless steel bolts and structural adhesive. After applying structural adhesive on the joint, the stainless steel bolts are fixed in the reserved holes. Wait for 24 hours until the structural adhesive is completely solidified, and the visualization test section 2 can be fixed.

[0047] The sink base 4 uses a stainless steel square tube as its main material, is arranged with multiple legs, and is arranged with support legs extending to the top of the sink body 1 at key locations, combined with the transverse steel tube at the top of the sink body 1, to provide sufficient transverse rigidity for the structure.

[0048] The main thruster 6 and the regulating thruster 7 are small-volume, waterproof, and high-torque brushless motors with fairings, and are arranged in a 2×3 array in the same section. Figure 1 and Figure 5 The propeller frame 8 is designed and installed using a U-shaped stainless steel profile with holes, which provides sufficient rigidity while reducing water flow obstruction. The thickness is 1mm, and the narrowest side faces the water flow. The round hole is convenient for adjusting the position of the propeller 9 on the propeller frame 8. Figure 5 Two propellers 9 are arranged vertically on each frame, and three propeller frames 8 are arranged horizontally in the water tank body 1, which can provide a 2×3 array propulsion force for the water flow cross section.

[0049] The installation method of the propeller frame 8 is shown in Figure 1 and Figure 5 The propeller skeleton 8 is integrally stuck between the bottom plate of the water tank body 1 and the transverse force-bearing rod, forming a triangular structure. At the same time, the three diagonal braces of the propeller skeleton 8 are transversely locked with stainless steel transverse connecting profiles to limit their lateral displacement. Under the reverse thrust of the water flow, the diagonal braces of the overall propeller skeleton 8 are stressed and the force is transmitted to the stainless steel water tank base 4 at the bottom of the water tank body 1, which is firmly fixed to avoid excessive disturbance of the water flow.

[0050] The architecture of the thruster control system 5 of this embodiment is as follows Figure 6 As shown, the thruster control system 5 mainly includes a digital controller, an electronic speed regulator, wires and an electrical box, etc. The digital controller, electronic speed regulator, wires and other components are integrated in the electrical box, the screen and buttons of the digital controller are embedded in the outer surface of the electrical box, and waterproof, anti-electric, ventilated and cooling treatments are done. Each propeller motor of the regulating thruster 7 is connected to a different digital controller and electronic speed regulator to form a separate control route, and multiple propeller motors of the main thruster 6 are connected to the same control route for synchronous adjustment.

[0051] There are two specific configuration methods of the circulating test water tank driven by the propeller array of the present invention:

[0052] Uniform flow field, first use the main propeller 6 to push the water flow to the speed required by the flow field. After the water flows through the bend, the flow velocity on the outside of the water tank is large, and the flow velocity on the inside is small. The power of the propeller 9 on the inside of the propeller 7 can be increased to compensate for the flow velocity on the inside of the water tank. After passing through the rectifying grid 3, a uniform and stable flow field is formed;

[0053] The non-uniform flow field first forms a uniform flow field according to the flow field data required for the test, and then controls and adjusts the output power of the motors corresponding to the different propellers 9 of the propeller 7, and passes through the rectifying grid 3 to form a specified non-uniform flow field.

[0054] According to the above specific implementation of the present invention, the completed physical test simulates that all functions are normal. See Figure 7 (a) and Figure 7 (b), which are the positions and layout diagrams of the cross-sectional flow velocity measurement points during the physical test of the water tank, wherein the water flow cross section is 75cm×30cm, and a measurement point is set every 5cm in the horizontal and vertical directions, with a total of 5×14 flow velocity measurement points in the entire cross section. The actual use effect of the configuration method of the present invention can be seen in Figure 8(a) to Figure 8(c) When the test requires a uniform flow field with a velocity of 0.38 m / s, after the adjustment compensation is performed using the regulating propeller, the flow velocity distribution of the water flow section in the visualization test section is uniform. The comparison before and after compensation is shown in Figure 8(a) and Figure 8(b). By further adjusting the output power of the main propeller and the regulating propeller, a uniform flow field with a velocity of 0.5 m / s can also be obtained. Taking the lateral distribution of the velocity at 1 / 2 water depth as an example, as shown in Figure 8(c), the maximum error does not exceed 4% when the flow velocity is 0.38 m / s and 0.5 m / s, and the effect can meet the design expectations.

[0055] It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Those skilled in the art should be aware that conventional modifications and improvements can be made within the corresponding technical scope based on the principles, concepts and implementations of the present invention, or some of the technical features of the present invention can be replaced by equivalents, and these modifications, equivalent replacements and improvements should also be deemed to fall within the protection scope of the present invention.

Claims

1. A circulating test water tank driven by a propeller array, characterized in that: The invention comprises a water tank body (1) of an annular structure, wherein a transparent visual test section (2) is arranged on the water tank body (1); a main propeller (6) and an adjusting propeller (7) are arranged inside the water tank body (1), wherein the main propeller (6) is provided with a plurality of groups, and the adjusting propeller (7) is arranged at the beginning of the visual test section (2); the main propeller (6) and the adjusting propeller (7) both comprise a plurality of propellers (9) arranged in a uniform array on the same water flow section, and the propellers (9) provide a uniform driving force for the water flow; the main propeller (6) and the adjusting propeller (7) are connected to a propeller control system (5), and the propeller control system (5) controls the motor output power of each propeller (9) individually.

2. The circulating test water tank driven by a propeller array according to claim 1, characterized in that: The annular water tank body (1) comprises a long straight section and an arc section. The visual test section (2) and the regulating propeller (7) are arranged on the long straight section on one side, and the main propeller (6) is arranged on the long straight section on the other side.

3. The circulating test water tank driven by the propeller array according to claim 1 or 2, characterized in that: A rectifying grid (3) for stabilizing turbulent water flow is provided between the regulating propeller (7) and the visualization test section (2).

4. The circulating test water tank driven by a propeller array according to claim 3, characterized in that: The rectifying grid (3) adopts a PVC round hole grid, and the hole diameter, depth and wall thickness of the PVC round hole grid are designed according to test requirements.

5. The circulating test water tank driven by a propeller array according to claim 1, characterized in that: The water tank body (1) is mounted on a water tank base (4), and the water tank base (4) adopts a multi-point support design, and the height of the water tank body (1) at different positions is leveled at multiple points through the water tank base (4).

6. The circulating test water tank driven by a propeller array according to claim 1, characterized in that: The water tank body (1) is made of stainless steel as a whole and is provided with a plurality of transverse force-bearing rods at intervals; the visual test section (2) is made of acrylic material; the visual test section (2) and the water tank body (1) are fixed with stainless steel bolts and structural adhesive.

7. The circulating test water tank driven by a propeller array according to claim 1, characterized in that: The main propeller (6) and the regulating propeller (7) have the same structure, both comprising a plurality of propeller frames (8) and U-shaped stainless steel profiles with holes (10); the same set of propeller frames (8) and U-shaped stainless steel profiles with holes (10) are combined to form a self-limiting stable triangular structure; the plurality of propeller frames (8) and U-shaped stainless steel profiles with holes (10) are fixed together by transverse connecting profiles; a plurality of propellers (9) are mounted on the propeller frames (8) to form a uniform array arrangement on the same water flow section.

8. The propeller array driven circulating test water tank according to claim 1, characterized in that: The propeller (9) is driven by a brushless motor with a low KV value and waterproof treatment, and a fairing is arranged outside the propeller (9).

9. The propeller array driven circulating test water tank according to claim 1, characterized in that: The propeller control system (5) uses a digital controller to transmit a control signal to an electronic speed regulator, thereby controlling the speed and power of the brushless motor of each propeller (9); connecting the brushless motor of each propeller (9) to a different control route to form a separate control route; or connecting the brushless motor of each propeller (9) to the same control route for synchronous adjustment.

10. A method for configuring a circulating test water tank driven by a propeller array as claimed in any one of claims 1 to 9, characterized in that: The method comprises: firstly, providing a uniform thrust to a main propeller (6) in a water tank body (1) on the opposite side of a visualization test section (2) to push the water flow to a set speed; after the water flow reaching the set speed enters the water tank body (1) on one side of the visualization test section (2), a propeller control system (5) individually controls the output power of each propeller (9) motor of the regulating propeller (7), and then, at the beginning of the visualization test section (2), the water flow is compensated for flow velocity or the flow field is adjusted, so as to form a stable uniform or non-uniform flow field required for the test in the visualization test section (2).

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