Gravity type circulating water tunnel test device

Abstract

The invention belongs to the technical field of hydrodynamic tests, and particularly relates to a circulating water tunnel test device. A gravity type circulating water tunnel testing device adopts the technical scheme that double rows of backflow pipelines are adopted as backflow pipelines of the testing device, and each backflow pipeline is connected with a centrifugal pump; two ends of the centrifugal pump are connected with the shock-proof throats; the outlet end of the centrifugal pump is connected to the large end of the contraction section through a pipeline; the small end of the contraction section is connected with the working section; the working section is connected to the small end of the expansion section through the round-top and square-bottom section; the large end of the expansion section is connected into the container section through a corrugated pipe; and the container section is connected into a return pipeline. The two high-power centrifugal pumps are arranged, and the two centrifugal pumps are connected with the two rows of pipelines correspondingly, so that the effect of doubling the flow in the pipelines is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrodynamics tests, and in particular relates to a circulating water tunnel test device. Background Art

[0002] As a large-scale hydrodynamic test device, the circulating water tunnel test equipment plays an extremely important role in the current scientific research on hydrodynamics and fluid mechanics. A complete set of circulating water tunnel test equipment can provide a flow field environment close to the real state for ships, torpedoes, submarines and other surface and underwater vehicles.

[0003] The existing circulating water tunnel designs are generally similar, connecting the working section, contraction section, diffusion section and other pipeline sections, and forming a cycle through the return pipeline. With the gradual deepening of scientific research and the gradual enrichment of research results, more stringent requirements have been put forward for the parameters of the circulating water tunnel, such as low disturbance, high flow rate, large flow rate, and low cavitation rate. Summary of the invention

[0004] The purpose of the present invention is to provide a gravity-type circulating water tunnel test device in response to experimental needs. The return pipeline of the test device adopts a double-row return pipeline, and each pipeline is provided with a centrifugal pump; by arranging two high-power centrifugal pumps and double-row return pipelines, the power of the test device is greatly increased, thereby improving the water flow in the pipeline of the test device.

[0005] The technical solution of the present invention is: a large flow rate gravity circulating water tunnel test device, an upper horizontal section, a vertical section A, a vertical section B, two return pipes and two lower horizontal pipe sections arranged side by side;

[0006] The upper ends of the two return pipes are connected to the vertical section B, and the lower ends are connected to the corresponding lower horizontal pipe sections; the two lower horizontal pipe sections are respectively provided with centrifugal pumps;

[0007] The other ends of the two lower horizontal pipeline sections are respectively connected to the vertical section A, the upper end of the vertical section A is connected to one end of the upper horizontal section, and the other end of the upper horizontal section is connected to the container section; the container section is connected to the vertical section B;

[0008] The upper horizontal section includes: a contraction section, a working section, a top-bottom section and a diffusion section which are coaxially connected in sequence; the vertical section A is connected to the large end of the contraction section, and the small end of the contraction section is connected to the working section; the working section is connected to the small end of the expansion section through the top-bottom section; the large end of the expansion section is connected to the container section through a bellows.

[0009] The water in the return pipe flows out through the outlet of the centrifugal pump and enters the connecting pipe. After passing through the contraction section, the water in the pipe has its cross-sectional area reduced and its flow rate increased. After passing through the working section, the water flows through the gradually increasing cross-sectional area of ​​the expansion section, and its flow rate gradually decreases, and then flows back to the centrifugal pump, thus completing the cycle.

[0010] On the basis of the above solution, further, the lower horizontal pipeline section is connected to the vertical section A through a first elbow section, and a first flow stabilizing net is provided at the end of the connecting end of the first elbow section and the vertical section A;

[0011] A second rectifying grid is provided in the vertical section A;

[0012] A guide vane is provided at the corner of the second elbow section where the vertical section A is connected to the contraction section;

[0013] A first rectifying grid is also provided in the second elbow section.

[0014] The arrangement of the guide blades can reduce the impact of the water flow on the pipeline and make the water flow in the pipeline more stable. The arrangement of the first flow stabilizing net and the second flow stabilizing net can reduce the impact of the water flow on the pipeline and reduce the vibration of the pipeline.

[0015] On the basis of the above solution, further, both ends of the centrifugal pump are connected with shock-absorbing throats.

[0016] On the basis of the above solution, further, flow meters are respectively provided on the two horizontal pipeline sections.

[0017] On the basis of the above solution, further, a second flow stabilizing net is provided at the end of the inlet end of the container section.

[0018] On the basis of the above solution, further, a protective net is provided at the interface between the vertical section B and the container section.

[0019] On the basis of the above solution, further, the working section is provided with a working section cover and an observation window, so that the experimenter can observe the test process intuitively. Inspection holes are respectively provided at the corners of the container section and the second elbow section.

[0020] On the basis of the above scheme, further, the test device is installed in the foundation and supported by a support frame.

[0021] Beneficial effects:

[0022] (1) The present invention is equipped with two high-power centrifugal pumps, which are respectively connected to two rows of return pipes, and can double the flow rate in the pipes. Before entering the working section, the circulating water passes through the flow stabilizing net to reduce the impact of the water flow, and then passes through the rectifying grid. The honeycomb structure cuts the water to achieve a rectifying effect, so that the water in the pipe flows evenly. The guide vanes in the square elbow reduce the pressure loss in the elbow and reduce the impact of the water flow on the pipe. After the rectifying effect of the rectifying grid, the water that finally flows into the working section is uniform and stable.

[0023] (2) In the present invention, both ends of the water pump are connected to the shock absorber throat. Through the adjustment function of the shock absorber throat, the vibration caused by the water flow impact at the water inlet and outlet of the water pump is reduced, thereby improving the stability of the flow field entering the pipeline and improving the test effect. The flow meter on the straight pipeline is used to measure the pipeline flow.

[0024] (3) In the present invention, the rear end of the diffuser section is connected to a bellows, which is sleeved outside the diffuser section. One end of the bellows is connected to a flange welded on the diffuser section through a flange, and the other end is connected to a flange of the container section through a flange. The bellows can provide a certain amount of axial and radial deformation, so that there is an adjustment amount during the installation of the entire pipeline connection system, making the installation process smoother. The rear end of the diffuser section is provided with a bellows, which can play a regulating role in the process of pipeline installation and docking, avoiding the problem of pipeline docking difficulties caused by construction errors.

[0025] (4) In the present invention, a safety net is installed at the connection position between the container section and the pipeline. When an unexpected situation occurs that small-sized parts of the test model in the working section fall off, the safety net can play a filtering role to prevent foreign matter from entering the pipeline circulation and causing damage to fragile structures such as the water pump body or glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention;

[0028] Figure 3 It is a structural schematic diagram of the protective net in the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of the Tianyuandifang segment in the present invention;

[0030] Figure 5 It is a schematic cross-sectional diagram of the rectifier grid in the present invention;

[0031] Figure 6 It is a schematic diagram of the shock-absorbing throat structure of the present invention;

[0032] Figure 7It is a structural schematic diagram of the bellows connection in the present invention;

[0033] Figure 8 It is a schematic diagram of the working section structure in the present invention.

[0034] Among them: 1-working section; 2-contraction section; 3-first rectifying grid; 4-guide vane; 5-second rectifying grid; 6-first flow stabilizing net; 7-flow meter; 8-support frame; 9-shock absorber throat; 10-water pump; 11-foundation; 12-protective net; 13-inspection hole; 14-container section; 15-second flow stabilizing net; 16-bellows; 17-diffusion section; 18-round section; 19-motor; 20-return pipeline; 101-working section cover; 102-observation window. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0036] This embodiment provides a gravity-type circulating water tunnel test device. By arranging two high-power centrifugal pumps and double-row return pipes, the power of the test device is greatly increased, thereby improving the water flow in the pipes of the test device.

[0037] like Figure 1 and Figure 2 As shown, when in use, the gravity-type circulating water tunnel test device is installed in the foundation 11 and supported by a plurality of support frames 8 at the bottom. The test device adopts a double-row return pipeline 20 (i.e., two return pipelines 20 are arranged side by side at the return end), each return pipeline 20 is connected to a centrifugal pump 10, and the centrifugal pump 10 adopts a high-power centrifugal pump; thus, by setting two high-power centrifugal pumps 10 and double-row return pipelines 20, the power of the test device is greatly increased, thereby increasing the water flow in the pipeline of the test device (the flow in the pipeline can be doubled). Each centrifugal pump 10 is driven by a motor 19.

[0038] Specifically, the gravity-type circulating water tunnel test device includes: an upper horizontal section, two vertical sections (vertical section A and vertical section B respectively), two return pipes 20 and two lower horizontal pipe sections; wherein the two vertical sections are vertically arranged at both ends of the upper horizontal section, the upper ends of the two vertical sections are connected to the upper horizontal section, the lower end of the vertical section B is connected to two return pipes 20 arranged side by side, and the two return pipes 20 are respectively connected to the lower end of the vertical section A through the two lower horizontal pipe sections.

[0039] A centrifugal pump 10 is provided in the horizontal pipeline section corresponding to each return pipeline 20, and both ends (i.e., the outlet end and the inlet end) of the centrifugal pump 10 are connected to Figure 6 The shock-absorbing throat 9 shown can reduce the vibration at both ends of the centrifugal pump 10 through the adjustment function of the shock-absorbing throat 9, so that the water flow in the pipeline of the test device is more stable.

[0040] The upper horizontal section includes: a contraction section 2, a working section 1, a radius section 18 and a diffusion section 17 which are coaxially connected in sequence; the outlet end of the centrifugal pump 10 is connected to the large end of the contraction section 2 through the corresponding lower horizontal pipeline section and the vertical section A; the small end of the contraction section 2 is connected to the working section 1; the working section 1 is connected to the small end of the expansion section 17 through the radius section 18.

[0041] The cross sections of the vertical section A, the working section 1 and the contraction section 2 (including the cross section of the center hole) are all rectangular; Figure 4 As shown, the cross-section of one end of the round square segment 18 (including the cross-section of the center hole) is rectangular, and the cross-section of the other end (including the cross-section of the center hole) is circular; the rectangular cross-section end of the round square segment 18 is connected to the working section 1, and the circular cross-section end is connected to the expansion section 17.

[0042] like Figure 7 As shown, the large end of the expansion section 17 is connected to the container section 14 through the bellows 16. Specifically, the bellows 16 is sleeved outside the expansion section 17, one end is connected to the flange welded on the expansion section 17 through a flange, and the other end is connected to the flange of the container section 14 through a flange (the expansion section 17 is not directly connected to the container section 14). The bellows 16 can provide a certain amount of axial and radial deformation, so that there is an adjustment amount during the installation of the entire pipeline connection system, making the installation process smoother. Therefore, the bellows 16 can play a regulating role in the process of pipeline installation and docking, avoiding the problem of pipeline docking difficulties caused by construction errors.

[0043] At the same time, a second flow stabilizing net 15 is connected to the flange of the inlet section of the container section 14 .

[0044] The container section 14 is connected to the return pipe 20 through the vertical section B; two return pipes 20 are arranged in parallel and are respectively connected to the vertical section B. At the interface between the vertical section B and the container section 14, there is a Figure 3 The protective net 12 is shown. During the test, if foreign objects such as small-sized parts fall off in the pipeline, the protective net 12 can filter them in time to prevent the foreign objects from entering the pipeline circulation and causing damage to fragile structures such as the pump body or glass.

[0045] The lower horizontal pipeline section is provided with first elbow sections at both ends, and the return pipeline 20 and the vertical section A are respectively connected through the first elbow sections at both ends. The vertical section A is connected to the contraction section 2 through the second elbow section.

[0046] A flow meter 7 is provided on the lower horizontal pipeline section to measure the pipeline flow.

[0047] A first flow stabilizing net 6 is provided at the end of the first elbow section where the lower horizontal pipeline section is connected to the vertical section A, a second flow stabilizing grid 5 is provided in the vertical section A, a flow guide vane 4 is provided at the corner of the second elbow section, and a first flow stabilizing grid 3 is also provided in the horizontal part of the second elbow section; the outlet of the second elbow section is connected to the large end of the contraction section 2. The setting of the flow guide vane 4 can reduce the impact of the water flow on the pipeline and make the water flow in the pipeline more stable. The setting of the first flow stabilizing net 6 and the second flow stabilizing net 15 can reduce the impact of the water flow on the pipeline and reduce the vibration of the pipeline.

[0048] See attached Figure 5 The first rectifying grid 3 and the second rectifying grid 5 are honeycomb-shaped. The rectifying grid in the form of a honeycomb cross section can cut the flow field and make the flow field in the pipeline uniform.

[0049] See attached Figure 8 The working section 1 is provided with a working section cover 101 and an observation window 102. Transparent organic glass is installed in the observation window 102, so that the experimenter can observe the test process intuitively.

[0050] Inspection holes 13 are respectively provided at the container section 14 and the corners of the second elbow section, through which the entire test device can be regularly maintained.

[0051] The water in the return pipe 20 flows out through the outlet end of the centrifugal pump 10 and enters the corresponding lower horizontal pipe section. The water in the pipe reduces the cross-sectional area and increases the flow rate after passing through the contraction section 2. After passing through the working section 1, the water flows through the gradually increasing cross-sectional area of ​​the expansion section 17, and the flow rate gradually decreases, and then flows back to the centrifugal pump 10, thus completing the cycle.

[0052] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A gravity-type circulating water tunnel test device, characterized in that: include: An upper horizontal section, a vertical section A, a vertical section B, two return pipelines (20) and two lower horizontal pipeline sections arranged side by side; The upper ends of the two return pipelines (20) are in communication with the vertical section B, and the lower ends are in communication with the corresponding lower horizontal pipeline sections; the two lower horizontal pipeline sections are respectively provided with a centrifugal pump (10); The other ends of the two lower horizontal pipeline sections are respectively connected to the vertical section A, the upper end of the vertical section A is connected to one end of the upper horizontal section, and the other end of the upper horizontal section is connected to the container section (14); the container section (14) is connected to the vertical section B; The upper horizontal section comprises: a contraction section (2), a working section (1), a radius section (18) and a diffusion section (17) which are coaxially connected in sequence; the vertical section A is connected to the large end of the contraction section (2), and the small end of the contraction section (2) is connected to the working section (1); the working section (1) is connected to the small end of the expansion section (17) through the radius section (18); the large end of the expansion section (17) is connected to the container section (14) through a bellows (16).

2. The gravity-type circulating water tunnel test device according to claim 1, characterized in that: The lower horizontal pipeline section is connected to the vertical section A through a first elbow section, and a first flow stabilizing net (6) is provided at the end of the connecting end of the first elbow section and the vertical section A; A second rectifying grid (5) is provided in the vertical section A; A guide vane (4) is provided at the corner of the second elbow section where the vertical section A is connected to the contraction section (2); A first rectifying grid (3) is also provided in the second elbow section.

3. The gravity-type circulating water tunnel test device according to claim 1, characterized in that: Both ends of the centrifugal pump (10) are connected to shock-absorbing throats (9).

4. The gravity-type circulating water tunnel test device according to claim 1, 2 or 3, characterized in that: Flow meters (7) are respectively provided on the two horizontal pipeline sections.

5. The gravity-type circulating water tunnel test device according to claim 1, 2 or 3, characterized in that: A second flow stabilizing net (15) is provided at the end of the inlet end of the container section (14).

6. The gravity-type circulating water tunnel test device according to claim 1, 2 or 3, characterized in that: A protective net (12) is provided at the interface between the vertical section B and the container section (14).

7. The gravity-type circulating water tunnel test device according to claim 1, 2 or 3, characterized in that: The working section (1) is provided with an observation window (102); and inspection holes (13) are provided at both axial ends of the upper horizontal section.

8. The gravity-type circulating water tunnel test device according to claim 1, 2 or 3, characterized in that: The test device is installed in a foundation (11) and supported by a support frame (8).

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