Hydraulic model test platform and test method for partial fracture of pressure steel pipe

Abstract

The invention provides a hydraulic model test platform and test method for partial fracture of a pressure steel pipe. The test platform comprises a test simulation module, a test measurement module and a test data acquisition and processing module, the test simulation module comprises a plant typical building model, a pressure steel pipe, a pressure steel pipe anchor block, a U-shaped groove, a jacking device, a mounting bottom plate, a drainage channel and a forebay water tank; the test measurement module comprises a plurality of cameras, a plurality of ultrasonic displacement sensors and a high-precision instantaneous pressure sensor; the test data acquisition and processing module comprises a signal transmission system, a signal collection system and a work station. According to the invention, the position relation between the pressure steel pipe and important facilities of a factory building can be accurately and flexibly expressed by using the jacking device and a modular assembly mode, so that the accuracy of a subsequent hydraulic test is guaranteed; the test method stipulates a series of processes, and can systematically and completely guide the local fracture hydraulic model test of the pressure steel pipe of the hydropower station.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydraulic model test design, and particularly relates to a pressure steel pipe local rupture hydraulic model test platform and a test method. BACKGROUND

[0002] In a hydropower project, a steel pipe has gradually become an important way for conveying water from a reservoir, a forebay or a surge tank to a water turbine in a hydropower station due to the advantages of high pressure bearing, strong deformation adjustment of foundation, good anti-seepage and the like. The pressure steel pipe is mostly installed on a high and steep slope, and problems such as large-area collapse of pipe back surrounding rock, excessive external load and improper construction may exist in the construction process, and the pipe also faces the risk of bearing dynamic water pressure and high internal water pressure in the operation process. Considering that the end of the pressure steel pipe is close to the powerhouse, once local rupture occurs in the operation, the accident of flooding the powerhouse and the unit will occur, and the consequences are very serious. When the pressure steel pipe has a rupture risk, which causes a security risk to the safe and normal operation of the power station, the following two treatment measures are generally taken: first, a scouring wall is arranged in front of the powerhouse; and second, the pressure steel pipe is replaced and reconstructed.

[0003] The leakage characteristics obtained by the pressure steel pipe local rupture hydraulic model test are important basis for determining the position of the scouring wall and the timing of the pressure steel pipe replacement and reconstruction. However, at present, the pressure steel pipe local rupture test platform and the test method have not been systematically studied. SUMMARY

[0004] A first object of the application is to provide a pressure steel pipe local rupture hydraulic model test platform in view of the above-mentioned problems.

[0005] To achieve the above object, the application adopts the following technical scheme:

[0006] A pressure steel pipe local rupture hydraulic model test platform, comprising a test simulation module, a test measurement module and a test data acquisition and processing module.

[0007] The test simulation module comprises a powerhouse typical building model, a pressure steel pipe, a pressure steel pipe pier, a U-shaped groove, a jacking device, a mounting bottom plate, a drainage channel and a forebay water tank. The mounting bottom plate is provided with the powerhouse typical building model, and the mounting bottom plate is provided with the drainage channel on the side. The forebay water tank is communicated with the pressure steel pipe. The pressure steel pipe is arranged in the U-shaped groove, and the pressure steel pipe pier is arranged between the pressure steel pipe and the U-shaped groove. The jacking device is arranged at the bottom of the side of the U-shaped groove close to the forebay water tank. The pressure steel pipe is slotted to simulate the local rupture of the pressure steel pipe.

[0008] The test measurement module comprises a plurality of cameras arranged on the side of the mounting bottom plate, a plurality of ultrasonic displacement sensors arranged on the mounting bottom plate and high-precision instantaneous pressure sensors arranged on the water-facing surface of the powerhouse typical building model.

[0009] The test data acquisition and processing module comprises a signal transmission system, a signal collection system and a workstation.

[0010] In addition to the above technical solutions, the present application can also adopt or combine the following technical solutions:

[0011] As a preferred technical solution of the present application: the size of the typical building model of the plant is proportional to the length, width and height of the typical building in the plant.

[0012] As a preferred technical solution of the present application: the end of the pressure steel pipe is provided with a valve.

[0013] As a preferred technical solution of the present application: the camera is fixed on a slidable camera support, the peripheral side of the mounting bottom plate is provided with a camera sliding track, and the slidable camera support is slidably fixed on the camera sliding track.

[0014] As a preferred technical solution of the present application: the signal transmission system is used to receive and transmit the data generated by the camera, the ultrasonic displacement sensor and the high-precision instantaneous pressure sensor.

[0015] As a preferred technical solution of the present application: the signal collection system is used to store various signals collected in the test.

[0016] As a preferred technical solution of the present application: the workstation is used to install signal processing software and data analysis software.

[0017] The second object of the present application is to provide a test method of a pressure steel pipe local rupture hydraulic model.

[0018] To this end, the above objects of the present application are achieved by the following technical solutions:

[0019] A test method of a pressure steel pipe local rupture hydraulic model test platform, the method is based on the test platform described above, and comprises the following steps:

[0020] S1, analyze the deformation observation results and numerical simulation results of the power station pressure steel pipe, preliminarily determine the possible rupture position and rupture size of the pressure steel pipe, and design multiple test conditions on this basis;

[0021] S2, determine the hydraulic model test parameters;

[0022] S3, according to the actual arrangement of the power station forebay, pressure steel pipe, plant, and plant drainage channel structure, build a pressure steel pipe local rupture hydraulic model test platform;

[0023] S4, fill the water in the front pool, so that the upstream tunnel flow, the water level in the front pool and the outlet flow of the pressure steel pipe meet the numerical requirements and reach a stable state;

[0024] S5, according to the pressure steel pipe local rupture test working condition determined in step S1, opening the corresponding part of the pressure steel pipe model, and then immediately closing the pressure pipe end valve;

[0025] S6, recording the leakage flow pattern and the submergence of the main buildings in the plant area under each test working condition, and measuring the force of the leakage on the buildings;

[0026] S7, test data analysis.

[0027] The present application provides a kind of pressure steel pipe local rupture hydraulic model test platform and test method, with following beneficial effects: the present application utilizes jacking device and modular assembly, can accurately and flexibly express the position relationship between pressure steel pipe and important facilities of workshop, guarantee the accuracy of subsequent hydraulic test;The test method of the present application defines a series of processes such as test working condition design-model parameter determination-test operation procedure-test data recording and analysis, can systematically and completely guide the hydraulic model test of pressure steel pipe local rupture of hydropower station. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is the schematic diagram of the pressure steel pipe local rupture hydraulic model test platform provided by the present application.

[0029] Figure 2 It is the flow chart of the pressure steel pipe local rupture hydraulic model test method provided by the present application.

[0030] Figure 3 It is the schematic diagram of the process of single pipe lower half section rupture leakage of top left side.

[0031] In the figure: 1-type building model;2-pressure steel pipe;3-pressure steel pipe pier;4-U-shaped groove;5-jacking device;6-installation base plate;7-drainage channel;8-front pool water tank;9-video camera;10-ultrasonic displacement sensor;11-high-precision instantaneous pressure sensor;12-slidable video camera support;13-video camera sliding track;14-signal transmission system;15-signal collection system;16-workstation. DETAILED DESCRIPTION

[0032] The present application is further described in detail with reference to the drawings and specific examples.

[0033] As Figure 1 shown, a kind of pressure steel pipe local rupture hydraulic model test platform, including test simulation module, test measurement module, test data acquisition processing module;

[0034] The test simulation module comprises a factory typical building model 1, a pressure steel pipe 2, a pressure steel pipe pier 3, a U-shaped groove 4, a jacking device 5, an installation base plate 6, a drainage channel 7, and a forebay water tank 8. The factory typical building model 1 is arranged on the installation base plate 6. The installation base plate 6 is provided with the drainage channel 7 on the periphery. The drainage rate can be adjusted according to the actual drainage condition of the factory. The forebay water tank 8 is communicated with the pressure steel pipe 2. The pressure steel pipe 2 is arranged in the U-shaped groove 4. The pressure steel pipe 2 is provided with the pressure steel pipe pier 3 between the pressure steel pipe 2 and the U-shaped groove 4. The jacking device 5 is arranged at the bottom of the side of the U-shaped groove 4 close to the forebay water tank 8. The pressure steel pipe 2 is provided with a groove for simulating local rupture of the pressure steel pipe.

[0035] The test measurement module comprises a plurality of cameras 9 arranged on the periphery of the installation base plate 6, a plurality of ultrasonic displacement sensors 10 arranged on the installation base plate 6, and high-precision instantaneous pressure sensors 11 arranged on the water-facing surface of the factory typical building model 1.

[0036] The test data acquisition and processing module comprises a signal transmission system 14, a signal collection system 15, and a workstation 16.

[0037] The factory typical building model 1 is not fixed to a specific size. The length, width, and height of the typical building in the factory can be simulated in proportion. The specific features are not involved. Through the combination of a plurality of factory typical building models 1, the main structure inside the factory can be roughly simulated.

[0038] The pressure steel pipe 2 is provided with a valve at the end. The water supply can be quickly cut off by closing the valve. The flow rate of water in the pressure steel pipe 2 is adjusted by controlling the water level in the forebay water tank 8.

[0039] The jacking device 5 is hinged to the U-shaped groove 4. The jacking device 5 can adjust the inclination angle of the fixed U-shaped groove 4, thereby changing the positional relationship between the pressure steel pipe 2 and the factory typical building model 1.

[0040] The camera 9 is fixed to a slidable camera support 12. The periphery of the installation base plate 6 is provided with a camera sliding rail 13. The slidable camera support 12 is slidably fixed on the camera sliding rail 13. The position of the camera 9 can be flexibly arranged according to the distribution of the buildings in the factory.

[0041] The ultrasonic displacement sensor 10 is used to measure the flow rate of water after the steel pipe bursts.

[0042] The high-precision instantaneous pressure sensor 11 is used to measure the water flow impact force after the steel pipe bursts.

[0043] The signal transmission system 14 is used to receive and transmit the data generated by the camera 9, the ultrasonic displacement sensor 10, and the high-precision instantaneous pressure sensor 11.

[0044] The signal collection system 15 is used to store various signals collected in the test.

[0045] The workstation 16 is used to install signal processing software and data analysis software.

[0046] As shown in Figure 2 A test method for a local rupture hydraulic model of a penstock includes the following steps:

[0047] S1, analyze the deformation observation results and numerical simulation results of the penstock of the power station, preliminarily determine the possible rupture position and rupture size of the penstock, and design multiple test conditions on this basis;

[0048] S2, determine the hydraulic model test parameters:

[0049] S21, design the model length scale using the gravity similarity criterion, determine the model length scale, and the numerical value should not be less than 1:25;

[0050] S22, according to the similarity principle of the continuity law, determine the model flow velocity scale, flow rate scale, and water flow motion time scale, and convert the model front pool water level, penstock outlet flow rate and other parameters;

[0051] S3, according to the actual arrangement of the power station front pool, penstock, powerhouse, and plant drainage channel and other structures, build a penstock local rupture hydraulic model test platform;

[0052] S4, fill the pressure front pool with water, so that the upstream tunnel flow rate, front pool water level, and penstock outlet flow rate meet the numerical requirements and reach a stable state;

[0053] S5, according to the penstock local rupture test conditions determined in step S1, open the corresponding part of the penstock model, and then immediately close the end valve of the penstock;

[0054] S6, record the water leakage flow pattern and the submergence of the main buildings in the plant area under each test condition, measure the force of the water leakage on the buildings: use a camera to record the water leakage flow pattern of the penstock and the submergence of the main buildings in the plant area; use an ultrasonic displacement sensor to measure the time process of the submergence depth of the water leakage at a typical position; use a high-precision instantaneous pressure sensor to measure the impact load of the water flow on the main buildings in the plant area;

[0055] S7, test data analysis: focus on analyzing the maximum submergence depth of each building in the plant area, the maximum water flow pressure load, and the duration of the pipe leakage after the rupture, and then make recommendations for the layout position, range, and size of the anti-impact wall in front of the powerhouse, and the plant area submergence and drainage scheme after the penstock rupture.

[0056] Specifically, the test method for the local rupture hydraulic model of the penstock is implemented by the following steps:

[0057] S1, analyze the deformation observation results and numerical simulation results of the power station pressure steel pipe, preliminarily determine the possible rupture position and rupture size of the pressure steel pipe, and determine a plurality of test conditions on this basis, as shown in Table 1.

[0058] Table 1 Test conditions

[0059] Operating condition Break location Break configuration 1 Bottom, double pipe Full section 2 Bottom, left single pipe Full section 3 Bottom, double pipe Lower half section 4 Bottom, left single pipe Lower half section 5 Middle, double pipe Full section 6 Middle, left single pipe Full section 7 Middle, double pipe Lower half section 8 Middle, left single pipe Lower half section 9 Top, double pipe Full section 10 Top, left single pipe Full section 11 Top, double pipe Lower half section 12 Top, left single pipe Lower half section

[0060] S2, determine the hydraulic model test parameters: determine the model length scale λ = 1:20 according to the gravity similarity criterion; determine the model flow velocity scale λ = 4.47, the flow scale λ = 1788 and the water flow movement time scale λ = 4.47 according to the similarity principle of continuity law. Conversion gets the water level in the front pool 418m, the pressure steel pipe outlet flow 72m / s. v Q t 3

[0061] S3, according to the actual situation of the power station, the simulation range of the pressure steel pipe local rupture hydraulic model test is the front pool, the pressure steel pipe and the plant area, the drainage channel on the left side of the plant area, etc., and the pressure steel pipe local rupture hydraulic model test platform is built, as shown in Figure 1

[0062] S4, fill the pressure front pool with water, so that the upstream tunnel flow, the water level in the front pool and the pressure steel pipe outlet flow meet the numerical requirements and reach a stable state;

[0063] S5, according to the pressure steel pipe local rupture test conditions determined in step S1, open the corresponding part of the pressure steel pipe model, and then immediately close the end valve of the pressure pipe;

[0064] S6, record the water leakage flow pattern and the submergence of the main buildings in the plant area under each test condition, and measure the force of the water leakage on the buildings: use a camera to record the pressure steel pipe water leakage flow pattern and the submergence of the main buildings in the plant area; use an ultrasonic displacement sensor to measure the water leakage submergence depth time process at a typical position; use a high-precision instantaneous pressure sensor to measure the impact load of the water flow on the main buildings in the plant area;

[0065] S7, test data analysis: focus on analyzing the maximum submergence depth of each building in the plant area, the maximum water flow pressure load and the duration of the pipe burst after rupture under each test condition, and then suggestions can be made for the layout position, range and size of the anti-impact wall in front of the workshop, the plant area submergence and drainage scheme after the pressure steel pipe rupture.

[0066] As Figure 3 ​​​​​As shown, part of the test data is as follows: when the left single pipe at the top is broken in the lower half section, the water treatment chamber reaches the maximum flooding depth of 1.76 m at 5.4 min; the workshop reaches the maximum flooding depth of 1.4 m at 3.7 min; house 1 reaches the maximum flooding depth of 0.3 m at 4.5 min; house 2 reaches the maximum flooding depth of 0.42 m at 5.2 min; house 3 reaches the maximum flooding depth of 0.8 m at 3.7 min; and house 4 reaches the maximum flooding depth of 0.5 m at 5.4 min.

[0067] The above specific embodiments are used to explain and illustrate the present application, and are only preferred embodiments of the present application, but not limit the present application, any modification, equivalent replacement, improvement, etc. made to the present application falls into the protection scope of the present application.

Claims

1. A platform for a local break hydraulic model test of a penstock, characterized in that: The test platform comprises a test simulation module, a test measurement module, and a test data acquisition and processing module. The test simulation module comprises a typical building model (1), a pressure steel pipe (2), a pressure steel pipe pier (3), a U-shaped groove (4), a jacking device (5), a mounting base plate (6), a drainage channel (7), and a front pool water tank (8). The test measurement module comprises a plurality of cameras (9) arranged on the periphery of the mounting base plate (6), a plurality of ultrasonic displacement sensors (10) arranged on the mounting base plate (6), and high-precision instantaneous pressure sensors (11) arranged on the water-facing surface of the typical building model (1). The test data acquisition and processing module comprises a signal transmission system (14), a signal collection system (15), and a workstation (16).

2. The local buckling hydraulic model test platform for penstocks according to claim 1, characterized in that: The typical building model (1) is proportionally sized to simulate the length, width, and height of a typical building in a plant.

3. The local buckling hydraulic model test platform for penstocks according to claim 1, characterized in that: The pressure steel pipe (2) is provided with a valve at the end.

4. The local buckling hydraulic model test platform for penstocks according to claim 1, characterized in that: The cameras (9) are fixed on slidable camera supports (12), and the periphery of the mounting base plate (6) is provided with camera sliding tracks (13), and the slidable camera supports (12) are slidably fixed on the camera sliding tracks (13).

5. The hydraulic model test platform for local buckling of penstocks according to claim 1, characterized in that: The signal transmission system (14) is used to receive and transmit data generated by the cameras (9), the ultrasonic displacement sensors (10), and the high-precision instantaneous pressure sensors (11).

6. The hydraulic model test platform for local buckling of penstocks according to claim 1, characterized in that: The signal collection system (15) is used to store various signals collected in the test.

7. The hydraulic model test platform for local buckling of penstocks according to claim 1, characterized in that: The workstation (16) is used to install signal processing software and data analysis software.

8. A method of testing a local burst hydraulic model of a penstock, characterized by: The method is based on the test platform according to any one of claims 1-7 and comprises the following steps: S1, analyzing the deformation observation results and numerical simulation results of the power station pressure steel pipe, preliminarily determining the possible rupture position and rupture size of the pressure steel pipe, and designing multiple test conditions on this basis; S2, determining the test parameters of the hydraulic model; S3, according to the actual arrangement of the power station front pool, pressure steel pipe, plant, and drainage channel structure, building a pressure steel pipe local rupture hydraulic model test platform; S4, filling the pressure front pool with water, so that the upstream tunnel flow, the front pool water level, and the pressure steel pipe outlet flow meet the numerical requirements and reach a stable state; S5, according to the pressure steel pipe local rupture test condition determined in step S1, opening the corresponding part of the pressure steel pipe model, and then immediately closing the pressure pipe end valve; S6, recording the leakage flow pattern and the submergence of the main buildings in the plant area under each test condition, and measuring the force of the leakage on the buildings; S7, test data analysis.

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