A propeller array propelled recirculating test tank and method of configuration

Abstract

The application discloses a circulating test water tank driven by a propeller array and a configuration method, and relates to the field of water tank test devices.The circulating test water tank comprises a water tank body in a ring structure, and a transparent visual test section is arranged on the water tank body; a main propeller and an adjusting propeller are arranged in the water tank body; the main propeller is provided with several groups; the adjusting propeller is arranged at the start of the visual test section; the main propeller and the adjusting propeller both comprise several propellers arranged in a uniform array in the same water flow section, and the propellers provide uniform propelling force for water flow; the main propeller and the adjusting propeller are connected with a propeller control system, and the propeller control system separately controls the motor output power of each propeller.The water tank body only needs to be filled with water once, and the propeller is used to provide circulating power for water flow after water filling, so that water flow recycling is realized, the test cost of the water tank is reduced, the flow velocity distribution of each region of the water flow section can be changed, and the visual test section is realized.

Description

Technical Field

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

[0002] Flume testing is a common testing method in the field of hydraulics. It is used to study hydraulic and hydrological issues in water conservancy projects, such as bridge engineering, coastal engineering, dam design, port and shipping, and river management. It is an important means of understanding hydrodynamic processes, validating theoretical models, and optimizing design solutions. By controlling flume parameters such as inclination, flow rate, and flow velocity, researchers can simulate various hydrodynamic scenarios in real hydrological environments, thereby evaluating the feasibility and effectiveness of different engineering solutions.

[0003] However, existing water tank test equipment has the following problems: (1) The equipment manufacturing, use and maintenance costs are high, requiring 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, parameter adjustment is only performed 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 in 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 with an annular structure, on which a transparent visual test section is provided; main propellers and regulating propellers are arranged inside the water tank body, wherein the main propellers are provided in several groups, and the regulating propellers are arranged at the beginning of the visual test section; the main propellers and the regulating propellers both comprise several propellers uniformly arranged in an array on the same water flow section, and provide uniform propulsion force to the water flow through the propellers; the main propellers and the regulating propellers are connected to a propeller control system, and the propeller control system individually controls the motor output power of each propeller.

[0007] As a preferred scheme, the water tank body of the annular structure comprises two parts of a long straight line segment and a circular arc segment, the visual test section and the adjusting propeller are arranged on one side of the long straight line segment, and the main propeller is arranged on the other side of the long straight line segment.

[0008] As a preferred scheme, a flow stabilizing grid is arranged between the adjusting propeller and the visual test section.

[0009] As a preferred scheme, the flow stabilizing grid 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.

[0010] As a preferred scheme, the water tank body is mounted on a water tank base, the water tank base adopts a multi-point support design, and the height of different positions of the water tank body is leveled by the water tank base at multiple points.

[0011] As a preferred scheme, the water tank body as a whole adopts a stainless steel material and is additionally provided with a plurality of transverse force rods at intervals, the visual test section is processed by using an acrylic material; and the visual test section and the water tank body are fixed by using stainless steel bolts and structural glue.

[0012] As a preferred scheme, the main propeller and the adjusting propeller have the same structure, and each comprises a plurality of groups of propeller skeletons and hole-bearing U-shaped stainless steel profiles, a same group of propeller skeletons and hole-bearing U-shaped stainless steel profiles are combined to form a self-limiting stable triangular structure, a plurality of groups of propeller skeletons and hole-bearing U-shaped stainless steel profiles are fixed together by using a transverse connecting profile; and a plurality of propellers are installed on the propeller skeletons to form a uniform array arrangement in a same water flow section.

[0013] As a preferred scheme, the propeller is driven by a low KV value and waterproof treated brushless motor, and a fairing is arranged outside the propeller.

[0014] As a preferred scheme, the propeller control system transmits a control signal to an electronic speed regulator by using a digital controller, so as to control the speed and power of the brushless motor of each propeller; the brushless motor of each propeller is connected to different control lines to form separate control lines; or the brushless motor of each propeller is connected to the same control line for synchronous adjustment.

[0015] A configuration method of 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 separately controls the output power of each propeller motor of the regulating propeller, and then performs flow velocity compensation or flow field adjustment on the water flow at the beginning of the visualization test section 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 and 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 circulation power for the water flow, realizing the recycling of the water flow and avoiding the waste of water resources and energy. Through the reasonable design of the overall structure and the fixing method of the joint section, a transparent visual test section is set on the water tank body. The visual test section realizes the full visualization of the test section, providing a good visual basis for the real-time observation of the test phenomenon. In addition, the water propeller is innovatively designed. The propeller adopts an array layout. Several propellers are evenly arranged in an array on the same water flow section to provide uniform and stable thrust. According to the test requirements, the flow velocity distribution in each area of ​​the water flow section can be changed 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. The water flow can be recycled, avoiding the waste of water resources and energy, and can provide an important reference for engineering design and construction in the fields of water conservancy projects and bridge projects.

[0019] Furthermore, the main propeller and the adjustment propeller of the present invention both include several groups of propeller frames and U-shaped stainless steel profiles with holes. The same group of propeller frames and U-shaped stainless steel profiles with holes are combined to form a self-limiting and stable triangular structure. The several groups of propeller frames and U-shaped stainless steel profiles with holes are fixed together by transverse connecting profiles. The propeller 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 A schematic diagram of the overall structure of a circulating test water tank driven by a propeller array of the present invention;

[0021] FIG2( a ) is a schematic front view of a circulating test water tank driven by a propeller array according to the present invention;

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

[0023] FIG2( c ) is a schematic top view of a circulating test water tank driven by a propeller array according to 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 Schematic diagram of the visual test section structure of the circulating test water tank driven by the propeller array of the present invention;

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

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

[0028] FIG7( a ) is a schematic diagram of the flow rate test section of a circulating test water tank driven by a propeller array according to the present invention;

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

[0030] FIG8( a ) is a diagram showing the effect of adjusting the front cross-sectional 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 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 diagram showing the lateral distribution of flow velocity at 1 / 2 water depth in a circulating test tank configuration method driven by a propeller array according to 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-adjustment thruster; 8-thruster frame; 9-propeller; 10-U-shaped stainless steel profile with holes. DETAILED DESCRIPTION

[0034] The present invention will be described in further detail below with reference to the accompanying drawings.

[0035] See also Figure 1 and Figure 2(a) to Figure 2(c)An embodiment of the present invention proposes a circulating test water tank driven by a propeller array, comprising a water tank body 1 with an annular structure, on which a transparent visual test section 2 is provided; a main propeller 6 and an adjusting propeller 7 are arranged inside the water tank body 1, and the main propeller 6 is provided in 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 propulsion 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 individually controls the motor output power of each propeller 9.

[0036] In a possible embodiment, the annular water tank body 1 of the embodiment of the present invention includes two parts: 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. 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 one possible implementation, a flow straightening grid 3 is installed between the regulating propeller 7 and the visualization test section 2 to stabilize turbulent water flow. Furthermore, the flow straightening grid 3 is a PVC circular hole grid, with the aperture, depth, and wall thickness of the PVC circular hole grid designed according to test requirements. In this embodiment, the aperture is 4 cm, the depth is 10 cm, and the wall thickness is 1 mm.

[0038] In one possible embodiment, to adapt to complex terrain and ensure the level of the liquid level in the sink, the sink body 1 of the embodiment of the present invention is mounted on a sink base 4. The sink base 4 adopts a multi-point support design. The sink base 4 is used to level the height of the sink body 1 at different points at multiple points, while also providing sufficient load-bearing capacity. The main material of the sink base 4 in 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 one possible embodiment, the main propeller 6 and the regulating propeller 7 have the same structure, both including several groups of propeller skeletons 8 and perforated U-shaped stainless steel profiles 10. The same group of propeller skeletons 8 and perforated U-shaped stainless steel profiles 10 are combined to form a self-limiting and stable triangular structure. The several groups of propeller skeletons 8 and perforated U-shaped stainless steel profiles 10 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 on the long straight section of the water tank body 1 on the opposite side of the visual 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 the side of the visual test section 2. The propeller skeleton 8 of this embodiment is made of a thin and rigid material. While meeting the requirements of being thin and rigid, the propeller skeleton 8 can achieve self-limiting in the water tank body 1 and 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 one possible implementation, the propellers 9 of the present invention are driven by brushless motors with low KV values ​​and waterproofing, and are covered with fairings. The propeller control system 5 uses a digital controller to transmit control signals to an electronic speed regulator, thereby controlling the speed and power of the brushless motors of each propeller 9. Each brushless motor of each propeller 9 is connected to a different control path, forming a separate control path. Alternatively, the brushless motors of each propeller 9 can be connected to the same control path 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 1 on the opposite side of the visualization test section 2 provides uniform thrust to push the water flow to the 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 starting point of the visualization test section 2, forming 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 4mm thick stainless steel plates. Stainless steel square tubes are welded at the upper and lower edges of the outer sides, and stiffening ribs are arranged at intervals and welded to 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 5cm and two rows of screw holes are reserved. Figure 3 shown.

[0046] Visual test section 2 uses three-sided acrylic organic glass plates with a thickness of 8mm. The bottom plate of the water tank body 1 is grooved on both sides. After applying structural adhesive, 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 visual test section 2 and the water tank body 1 are fixed with 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 then the visual test section 2 can be fixed.

[0047] The sink base 4 uses stainless steel square tube as its main material, arranges multiple legs, and arranges support legs extending to the top of the sink body 1 at key positions. Combined with the horizontal steel pipe at the top of the sink body 1, it provides sufficient lateral rigidity for the structure.

[0048] The main propeller 6 and the regulating propeller 7 are equipped with small-sized, waterproof, high-torque brushless motors with fairings, and are arranged in a 2×3 array on the same section. Figure 1 and Figure 5 , U-shaped stainless steel profile with holes is used for the design and installation of the propeller frame 8, which provides sufficient rigidity while reducing water flow obstruction. The thickness is 1mm, and the narrowest side faces the water flow. The circular 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 stuck as a whole between the bottom plate of the water tank body 1 and the horizontal force rod, forming a triangular structure. At the same time, the three propeller skeletons 8 are locked laterally with stainless steel horizontal connecting profiles to limit their lateral displacement. Under the reverse thrust of the water flow, the overall propeller skeleton 8 is stressed by the diagonal braces, 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 structure of the thruster control system 5 of this embodiment is as follows Figure 6 As shown, the propeller 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, ventilation and cooling treatments are done. Each propeller motor of the regulating propeller 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 propeller 6 are connected to the same control route for synchronous adjustment.

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

[0052] Uniform flow field: First, the main propeller 6 is used to push the water flow to the speed required by the flow field. Since the water flow passes 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 inside the regulating propeller 7 can be increased to compensate for the flow velocity inside the water tank. After passing through the rectifying grid 3, a uniform and stable flow field is formed.

[0053] The non-uniform flow field is first formed into a uniform flow field according to the flow field data required for the test, and then the output power of the motor corresponding to the different propellers 9 of the propeller 7 is controlled and adjusted, and the specified non-uniform flow field is formed through the rectifier grid 3.

[0054] According to the above specific embodiment 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. The water flow cross section is 75 cm × 30 cm, and a measurement point is set every 5 cm along 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 adjustment compensation 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 scope of protection of the present invention. Those skilled in the art should be aware that, based on the principles, concepts, and embodiments of the present invention, conventional modifications and improvements can be made within the corresponding technical scope, or some of the technical features of the present invention can be replaced by equivalents, and such modifications, equivalent replacements, and improvements should also be deemed to fall within the scope of protection 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 provided 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 in a plurality of groups, and the adjusting propeller (7) is provided 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) uniformly arranged in an array on the same water flow section, and provide a uniform driving force for the water flow through the propellers (9); the main propeller (6) and the adjusting propeller (7) are connected to a propeller control system (5), and the propeller control system (5) individually controls the motor output power of each propeller (9); The annular water tank body (1) comprises two parts: a long straight section and a circular 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; 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), wherein the same set of propeller frames (8) and the U-shaped stainless steel profiles with holes (10) are combined to form a self-limiting stable triangular structure, and the plurality of propeller frames (8) and the 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.

2. The circulating test water tank driven by the propeller array according to claim 1, 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).

3. The circulating test water tank driven by the propeller array according to claim 2, characterized in that: The rectifying grid (3) adopts a PVC circular hole grid, and the aperture, depth and wall thickness of the PVC circular hole grid are designed according to the test requirements.

4. 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).

5. The circulating test water tank driven by a propeller array according to claim 1, characterized in that: The water tank body (1) is entirely made of stainless steel 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.

6. 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 provided outside the propeller (9).

7. 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.

8. A method for configuring a circulating test water tank driven by a propeller array according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: 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; after the water flow reaching the set speed 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 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).

Images