CN110174141B - Device and method for testing mechanical and fluid flow properties of pipe-in-pipe system - Google Patents
Device and method for testing mechanical and fluid flow properties of pipe-in-pipe system Download PDFInfo
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- CN110174141B CN110174141B CN201910559766.6A CN201910559766A CN110174141B CN 110174141 B CN110174141 B CN 110174141B CN 201910559766 A CN201910559766 A CN 201910559766A CN 110174141 B CN110174141 B CN 110174141B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention belongs to the technical field of simulation of pipe column mechanical tests, and relates to a device and a method for testing pipe-in-pipe system mechanical and fluid flow properties. The test cylinder is welded on the base in a sealing way, an outer pipe is arranged in the test cylinder through an outer pipe adapter screw thread fixedly arranged on the base, a top cover is arranged on the test cylinder at the top of the outer pipe in a sealing way through a fixing bolt, and the outer pipe is fixedly connected with the top cover in a sealing way through a chuck; an inner pipe bracket is arranged on the test cylinder above the top cover through a fixing bolt; the inner pipe is arranged in the outer pipe, the outer pipe is impacted by water flow, vibration behaviors of the inner pipe under the condition of fluid flow exist in the inner pipe, the influence of different pipe column combinations, the water flow and the water flow acting depth on the pipe column can be realized, and powerful technical guarantee is provided for the operation safety of deep water and ultra-deep water pipe columns.
Description
Technical Field
The invention belongs to the technical field of simulation of pipe column mechanical tests, and relates to a device and a method for testing the mechanical and fluid flow properties of a pipe-in-pipe system.
Background
The pipe column test is an indispensable link of oil and gas exploration and development, and the main purpose of the pipe column test is to accurately evaluate the characteristics of deep sea stratum fluid and the potential production of a well to be put into production before or at the early stage of oil and gas reservoir production. In the testing process, the flow of stratum oil gas is tested in the pipe column, well liquid exists between the test tube and the marine riser, and the impact force of water flow exists outside the marine riser. Under the environment of seawater action, the pipe column is subjected to severe environmental load, fluid action is carried out on the inside and the outside of the test pipe column, and interaction force between pipes in a pipe-in-pipe system is carried out, so that the performance of the pipe column is often influenced, and the service life of the pipe column is reduced. Therefore, development of the safety effect on the pipe-in-pipe system under the action of seawater environmental load is of great significance. At present, most of researches on the aspect adopt finite element analysis, so that the researches on the influence of real seawater environment load, oil gas load and interaction between pipes on a pipe column are very few, the influence between pipes, the influence of the ocean environment load and the oil gas on the pipe column cannot be fully simulated by the existing experimental method, and effective guarantee cannot be provided for the safety evaluation of a pipe-in-pipe system.
Disclosure of Invention
The invention aims at: the device and the method for testing the mechanical and fluid flow properties of the pipe in the pipe system are capable of accurately simulating the fluid load born by the outer pipe, the fluid action inside the inner pipe and the action between the pipes, researching the influence of each factor on the mechanical behavior of the pipe by changing the pipe column combination, the fluid density between the pipes, the fluid flow velocity outside the outer pipe and the fluid action depth, visually displaying the influence of each factor through data and curves, and providing powerful technical support and guarantee for the safety of pipe column testing operation.
The technical scheme of the invention is as follows:
the utility model provides a pipe in pipe system mechanics and fluid flow performance testing arrangement, includes inner tube, outer tube, experimental drum, drum inlet tube, bleeder and base, its characterized in that: the test cylinder is welded on the base in a sealing way, an outer pipe is arranged in the test cylinder through an outer pipe adapter screw thread fixedly arranged on the base, a top cover is arranged on the test cylinder at the top of the outer pipe in a sealing way through a fixing bolt, and the outer pipe is fixedly connected with the top cover in a sealing way through a chuck; an inner pipe adapter is arranged in the outer pipe adapter; an inner pipe bracket is arranged on the test cylinder above the top cover through a fixing bolt; an inner pipe is arranged in the outer pipe, one end of the inner pipe is in threaded connection with the inner pipe adapter, the other end of the inner pipe extends to the upper part of the top cover, and the inner pipe extending to the upper part of the top cover is connected with the inner pipe bracket through a pipe clamp; a cylinder water inlet pipe is arranged at one side of the test cylinder, and one end of the cylinder water inlet pipe is communicated with the test cylinder; the other end of the cylinder water inlet pipe is communicated with a water pool, the other side of the test cylinder is provided with a bleeder pipe, and one end of the bleeder pipe is communicated with the test cylinder; the other end of the bleeder tube is communicated with the water pool, the lower surface of the base is provided with a water inlet pipe, and one end of the water inlet pipe is communicated with the inner pipe through an inner pipe adapter; the other end of the water inlet pipe is communicated with the water pool.
The cylinder water inlet pipe is provided with a flow regulating pump B and a second flowmeter at intervals; a second flow control valve is arranged on the cylinder water inlet pipe between the flow regulating pump B and the second flowmeter.
The inner pipe extending to the upper part of the top cover is communicated with the water pool through the flow guide pipe.
The outer wall of the inner tube is provided with a plurality of first fiber grating sensors at intervals, and the outer wall of the outer tube is provided with a plurality of second fiber grating sensors at intervals. And each fiber bragg grating sensor is connected with a computer through a photoelectric converter and a data acquisition instrument respectively.
The water inlet pipe is provided with a first flowmeter and a flow regulating pump A at intervals, and the water outlet pipe between the first flowmeter and the flow regulating pump A is provided with a first flow control valve.
And a drainage hole is arranged on the base between the outer tube adapter and the inner tube adapter, and is communicated with the outer tube through the outer tube adapter. A plug is arranged on the thread on the drainage hole.
The testing method of the testing device comprises the following steps:
1) Firstly, a fixed pulley is arranged above the experimental device by means of a mounting frame or a laboratory ceiling, and then a tension rope is arranged on the fixed pulley, one end of the tension rope is in tethered connection with the inner pipe, and the other end of the tension rope is tethered with a balancing weight which is 5 times of the self weight of the inner pipe, so that an upward tension (top tension) is applied to the inner pipe; and the outer tube 2 is filled with intermediate liquid;
2) Checking the experimental device and the connection point, and starting up and debugging after omission is avoided, so that the experimental device has an operation state for collecting accurate data;
3) Calibrating each fiber grating sensor before an experiment, and clearing debugging data to prepare for collecting data in the experiment process;
4) Starting a flow regulating pump B to enable the space between the outer tube and the experimental cylinder to be full of fluid (simulated ocean current), then regulating the flow of the flow regulating pump B to a set value to enable the speed of the fluid in the experimental cylinder to be 0.2m/s, and starting a flow regulating pump A to regulate the flow of the fluid to the set value to enable the speed of the fluid in the inner tube to be 1.5m/s; in simulated ocean currents;
5) After the simulated ocean current is stable, the data (the measured data comprises the vibration frequency, displacement, amplitude and the like of the outer tube and the inner tube) measured by each fiber grating sensor are processed by a photoelectric converter and then transmitted to a data acquisition instrument for data acquisition, and then transmitted to a computer for storage;
6) The experimental data acquisition time lasts for more than 5min, and then all the fiber bragg grating sensors are closed, and the flow regulating pump B and the flow regulating pump A are closed;
7) After the data are stored, resetting the data of the sensor and the acquisition instrument for the next data acquisition;
8) Respectively starting a flow regulating pump A and a flow regulating pump B, then increasing the outflow flow rate (the flow rate in the experimental cylinder) by 0.08m/s by regulating a second flow control valve, starting each fiber grating sensor after the flow rate is stable, and collecting deformation data of 5 points on the inner tube and the outer tube; data corresponding to 5 groups of different outflow flow rates are acquired;
9) The flow rate of the inner pipe is increased by 0.15m/s by adjusting the first flow control valve through changing different types of the outer pipe and the inner pipe, and after the flow rate is stable, all fiber bragg grating sensors are started to collect data of the inner pipe and the outer pipe for different pipe column combinations, and 5 groups of data corresponding to different flow rates of the inner pipe are required to be collected; recording experimental data acquired by a fiber bragg grating sensor;
10 According to the inner pipe column combination and the outer pipe column combination which are commonly used in the field, changing different outer pipes and inner pipe types, carrying out experiments on 5 different pipe column combinations, repeating the steps 4) to 7), and recording experimental data acquired by the fiber bragg grating sensor;
11 Changing different guide pipes, changing the diameter of a central hole of the guide pipe, changing the length of fluid acting on the pipe column, researching the influence of different depths of action of ocean currents on the pipe column, repeating the steps 4) to 7), recording experimental data acquired by the fiber bragg grating sensor, and carrying out 5 groups of experiments in total;
12 The data obtained by direct measurement of the experiment are light signal wavelength, the strain of the pipe column can be obtained through a conversion formula of the wavelength and the micro strain of the pipe column, the stress of the pipe column can be obtained according to Hooke's law, then the displacement response of the pipe column is obtained through a modal analysis method according to the strain signals of all measurement points on the surface of the pipe column, then the Fast Fourier Transform (FFT) is carried out on the displacement response to obtain a corresponding vibration response frequency spectrum of the pipe column, finally the vibration frequency, the stress, the strain and the displacement of the pipe column are analyzed, and further the mechanical behavior of the pipe-in-pipe system under the marine environment and the rule of influence of all factors on the performance of the pipe column are obtained.
The invention has the beneficial effects that:
1. the system can simulate the mechanical change behavior of an outer pipe of a pipe-in-pipe system under the conditions that the outer pipe is impacted by outflow, flowing fluid exists in the inner pipe and interaction exists between the pipes in an inner-outer flow environment;
2. the influence of different pipe column combinations and different inter-pipe fluid densities on the pipe column can be realized;
3. the influence of the outer tube under the conditions of different flow rates, different action depths and hydrostatic and no fluid of the outer tube;
4. the test pipe column is subjected to the action of the internal and external fluids, the speed of the fluid in the pipe column can be changed by adjusting the pump B, and the factors affecting the performance of the pipe column can be accurately known.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is an enlarged schematic view of the structure of FIG. 1 at A;
FIG. 3 is an enlarged schematic view of the structure at B in FIG. 1;
fig. 4 is a block diagram of a measurement system according to the present invention.
In the figure: 1. the device comprises an inner pipe, 2, an outer pipe, 3, a test cylinder, 4, a cylinder water inlet pipe, 5, a bleeder pipe, 6, a base, 7, an outer pipe conversion joint, 8, a top cover, 9, a chuck, 10, an inner pipe bracket, 11, a water inlet pipe, 12, a water tank, 13, a flow guide pipe, 14, a flow regulating pump B,15, a second flowmeter, 16, a second flow control valve, 17, a first fiber bragg grating sensor, 18, a second fiber bragg grating sensor, 19, a first flowmeter, 20, a flow regulating pump A, 21, a first flow control valve, 22, a bleeder hole, 23, a blockage, 24 and an inner pipe conversion joint.
Detailed Description
The device for testing the mechanical and fluid flow properties of the pipe-in-pipe system comprises an inner pipe 1, an outer pipe 2, a test cylinder 3, a cylinder water inlet pipe 4, a bleeder pipe 5 and a base 6. The base 6 is welded with the test cylinder 3 in a sealing way, the test cylinder 3 is internally provided with the outer tube 2 through an outer tube adapter 7 which is fixedly arranged on the base 6 in a threaded way, and the outer tube adapter 7 is internally provided with an inner tube adapter 24; a drain hole 22 is arranged on the base 6 between the outer tube adapter 7 and the inner tube adapter 24, a plug 23 is arranged on the drain hole 22 in a threaded manner, and the drain hole 22 is communicated with the outer tube 2 through the outer tube adapter 7. A top cover 8 is arranged on the test cylinder 3 at the top of the outer tube 2 in a sealing way through a fixing bolt, and the outer tube 2 is fixedly connected with the lower surface of the top cover 8 in a sealing way through a chuck 9.
An inner pipe bracket 10 is arranged on the test cylinder 3 above the top cover 8 through a fixing bolt; an inner pipe 1 is arranged in the outer pipe 2, one end of the inner pipe 1 is in threaded connection with an inner pipe adapter 24, wherein the lower end head of the inner pipe 1 extends to the lower end of the base 6 through a water inlet pipe 11 and is communicated with a water pool 12. The water inlet pipe 11 is provided with a first flowmeter 19 and a flow regulating pump A20 at intervals, and the water outlet pipe between the first flowmeter and the flow regulating pump A is provided with a first flow control valve 21.
The other end (upper end) of the inner tube 1 extends above the top cover 8, the inner tube 1 extending above the top cover 8 is connected to the inner tube holder 10 by a tube clamp and communicates with the water reservoir 12 by a draft tube 13, whereby a working cycle is formed between the water inlet tube 11, the inner tube 1, the draft tube 13 and the water reservoir 12. A plurality of first fiber bragg grating sensors 17 are arranged on the outer wall of the inner tube 1 at intervals, and a plurality of second fiber bragg grating sensors 18 are arranged on the outer wall of the outer tube 2 at intervals. The first fiber bragg grating sensor 17 and the second fiber bragg grating sensor 18 are respectively connected with a computer through a photoelectric converter and a data acquisition instrument.
A cylinder water inlet pipe 4 is arranged on one side of the test cylinder 3, and one end of the cylinder water inlet pipe 4 is communicated with the test cylinder 3; the other end of the cylinder water inlet pipe 4 is communicated with the water pool 12, and a flow regulating pump B14 and a second flowmeter 15 are arranged on the cylinder water inlet pipe 4 at intervals; a second flow control valve 16 is provided on the inlet line between the flow regulating pump B14 and the second flowmeter 15.
A bleeder tube 5 is arranged on the other side of the test cylinder 3, and one end of the bleeder tube 5 is communicated with the test cylinder 3; the other end of the bleeder 5 is in communication with a sump 12.
The testing method comprises the following steps:
firstly, a fixed pulley is arranged above the experimental device by means of a mounting frame or a laboratory ceiling, and then a tension rope is arranged on the fixed pulley, one end of the tension rope is in tethered connection with the inner pipe 1, and the other end of the tension rope is tethered with a balancing weight which is 5 times of the self weight of the inner pipe 1, so that an upward tension force (tension force) is applied to the inner pipe 1; checking the experimental device and the connection point, and starting up and debugging after omission is avoided, so that the experimental device has an operation state for collecting accurate data;
calibrating each fiber grating sensor before an experiment, and clearing debugging data to prepare for acquiring data in the experiment process; at the same time, the intermediate liquid is injected from the injection port 24 arranged on the top cover 8 above the outer tube 2 and fills the outer tube 2, and when the intermediate liquid needs to be replaced, the plug 23 on the drain hole 22 can be removed in a rotating way.
Starting a flow regulating pump B14 to enable the space between the outer tube 2 and the experimental cylinder 3 to be filled with fluid (simulated ocean current), then regulating the flow of the flow regulating pump B14 to a set value to enable the speed of the fluid in the experimental cylinder 3 to be 0.2m/s, and starting a flow regulating pump A20 to regulate the flow of the fluid to the set value to enable the speed of the fluid in the inner tube to be 1.5m/s; to simulate sea currents; after the simulated ocean current is stable, the data (the measured data comprises the vibration frequency, displacement, amplitude and the like of the outer tube and the inner tube) measured by each fiber grating sensor are processed by a photoelectric converter, and then transmitted to a data acquisition instrument for data acquisition, and then transmitted to a computer for storage;
the experimental data collection time lasts for more than 5min, and then all the fiber bragg grating sensors are closed, and the flow regulating pump B14 and the flow regulating pump A20 are closed; after the data are stored, resetting the data of the sensor and the acquisition instrument for the next data acquisition; respectively starting a flow regulating pump A20 and a flow regulating pump B14, then increasing the outflow flow rate by 0.08m/s by regulating a second flow control valve 16, starting each fiber bragg grating sensor after the flow rate is stable, and collecting deformation data of 5 points on the inner tube and the outer tube; data corresponding to 5 groups of different outflow flow rates are acquired;
the flow rate of the inner pipe 1 is increased by 0.15m/s by adjusting the first flow control valve 21 through changing different types of the outer pipe 2 and the inner pipe 1, and after the flow rate is stable, each fiber bragg grating sensor is started to collect data of the inner pipe and the outer pipe for different pipe column combinations, so that 5 groups of data corresponding to different flow rates of the inner pipe are required to be collected; recording experimental data acquired by each fiber bragg grating sensor; according to the inner and outer pipe column combinations commonly used in the field, different outer pipe 2 and inner pipe 1 types are replaced, 5 different pipe column combinations are subjected to experiments, the steps 4) to 7) are repeated, and experimental data acquired by the fiber bragg grating sensor are recorded. Changing different guide pipes 13, changing the diameter of a central hole of the guide pipe, changing the length of fluid acting on the pipe column, researching the influence of different depths of action of ocean currents on the pipe column, repeating the steps 4) to 7), recording experimental data acquired by each fiber bragg grating sensor, and carrying out 5 groups of experiments in total; the data obtained through direct measurement in the experiment are light signal wavelength, the strain of the pipe column can be obtained through a conversion formula of the wavelength and the micro strain of the pipe column, the stress of the pipe column can be obtained according to Hooke's law, then the displacement response of the pipe column is obtained through a modal analysis method according to the strain signals of all measurement points on the surface of the pipe column, then the Fast Fourier Transform (FFT) is carried out on the displacement response to obtain a corresponding vibration response frequency spectrum of the pipe column, and finally the vibration frequency, the stress, the strain and the displacement of the pipe column are analyzed, so that the mechanical behavior of the pipe-in-pipe system under the ocean environment and the rule of influence of all factors on the performance of the pipe column are obtained; the method comprises the following steps:
the data obtained by direct measurement in the experiment are the wavelength of the optical signal, the strain of the pipe column can be obtained through a conversion formula of the wavelength and the micro strain of the pipe column, and the stress of the pipe column can be obtained according to Hooke's law.
Modal analysis solves for displacement response: according to structural dynamics theory, a tubular column with a length L is subjected to vibration displacementCan be written as:>wherein->. As the two ends of the experimental pipe column are simply supported, the middle vibration mode function can be taken as a sine function, namely +.>According to the geometrical relationship of deformation in the material mechanics, the strain of a certain point in bending deformation is obtained as follows: />Wherein->Is the distance from the neutral layer; />Is the radius of curvature of the neutral layer. The strain at a point on the surface of the pipe string is related to the radius of curvature as follows: />The method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>Is the radius of the pipe string. From higher mathematics, the plane curve +.>The curvature at any point is:
since the deformation in engineering practice is generally very small, the flexible line is an extremely flat line with very small values of deflection and angle of rotation. In this way, the value is smaller than 1 and can be omitted, thus obtaining the curvatureThe relationship with the second derivative of displacement is:。
from the above, the relationship between strain and displacement second derivative is:substituting the measured strain data into a formula to obtain a modal function +.>Substituting the mode function into the formula +.>And obtaining the displacement response of each point of the tubular column model.
And carrying out frequency spectrum analysis on the displacement response, carrying out Fast Fourier Transform (FFT) on the obtained displacement response by utilizing MATLAB software, wherein the abscissa in the transformed image represents the frequency, the ordinate represents the amplitude, a plurality of peaks exist in the image, and the abscissa corresponding to each peak is the characteristic frequency of the tubular column.
And analyzing the vibration spectrum, stress, strain and displacement of the pipe column by each factor, so as to obtain the mechanical behavior of the pipe-in-pipe system under the marine environment and the rule of influence of each factor on the performance of the pipe column.
Claims (1)
1. A method for testing mechanical and fluid flow properties of a pipe-in-pipe system comprises the following steps:
1) Firstly, a fixed pulley is arranged above an experimental device by means of a mounting frame or a laboratory ceiling, and then a tension rope is arranged on the fixed pulley, one end of the tension rope is in tethered connection with the inner pipe, and the other end of the tension rope is tethered with a balancing weight which is 5 times of the weight of the inner pipe, so that an upward tension is applied to the inner pipe (1);
2) Checking the experimental device and the connection point, and starting up and debugging after omission is avoided, so that the experimental device has an operation state for collecting accurate data; and the outer tube (2) is filled with intermediate liquid;
3) Calibrating each fiber grating sensor before an experiment, and clearing debugging data to prepare for collecting data in the experiment process;
4) Starting a flow regulating pump B (14) to enable the space between the outer tube (2) and the experimental cylinder (3) to be filled with fluid, then regulating the flow of the flow regulating pump B (14) to a set value to enable the speed of the fluid in the experimental cylinder (3) to be 0.2m/s, and starting a flow regulating pump A (20) to regulate the flow of the fluid to the set value to enable the speed of the fluid in the inner tube to be 1.5m/s; in simulated ocean currents;
5) After the simulated ocean current is stable, the data measured by each fiber grating sensor is processed by a photoelectric converter and then transmitted to a data acquisition instrument for data acquisition, and then transmitted to a computer for storage;
6) The experimental data collection time lasts for more than 5min, and then all the fiber bragg grating sensors are closed, and the flow regulating pump B (14) and the flow regulating pump A (20) are closed;
7) After the data are stored, resetting the data of the sensor and the acquisition instrument for the next data acquisition;
8) Respectively starting a flow regulating pump A (20) and a flow regulating pump B (14), then increasing the outflow flow rate by 0.08m/s by regulating a second flow control valve (16), and starting each fiber grating sensor after the flow rate is stable to acquire deformation data of 5 points on the inner tube and the outer tube; data corresponding to 5 groups of different outflow flow rates are acquired;
9) The flow rate of the inner pipe (1) is increased by 0.15m/s by adjusting the first flow control valve (21) through changing different types of the outer pipe (2) and the inner pipe (1), and after the flow rate is stable, all fiber bragg grating sensors are started to collect data of the inner pipe and the outer pipe for different pipe column combinations, and 5 groups of data corresponding to the flow rates of the different inner pipes (1) are required to be collected; recording experimental data acquired by each fiber bragg grating sensor;
10 According to the on-site common inner and outer pipe column combinations, changing different outer pipe (2) and inner pipe (1) types, carrying out experiments on 5 different pipe column combinations, repeating the steps 4) to 7), and recording experimental data acquired by all fiber grating sensors;
11 Changing different guide pipes (13), changing the diameter of a central hole of the guide pipe, changing the length of fluid acting on the pipe column, researching the influence of different depths of action of ocean currents on the pipe column, repeating the steps 4) to 7), recording experimental data acquired by each fiber bragg grating sensor, and carrying out 5 groups of experiments in total;
12 The data obtained by direct measurement of the experiment are light signal wavelength, the strain of the pipe column can be obtained through a conversion formula of the wavelength and the micro strain of the pipe column, the stress of the pipe column can be obtained according to Hooke's law, then the displacement response of the pipe column is obtained through a modal analysis method by strain signals of all measurement points on the surface of the pipe column, then the fast Fourier transformation is carried out on the displacement response to obtain a corresponding vibration response frequency spectrum of the pipe column, and finally the vibration frequency, the stress, the strain and the displacement of the pipe column are analyzed, so that the mechanical behavior of the pipe-in-pipe system under the ocean environment and the rule of influence of all factors on the performance of the pipe column are obtained;
the experimental device of step 1) includes inner tube (1), outer tube (2), experimental drum (3), drum inlet tube (4), bleeder (5) and base (6), its characterized in that: a test cylinder (3) is welded on the base (6) in a sealing way, an outer tube (2) is arranged in the test cylinder (3) through an outer tube adapter (7) fixedly arranged on the base (6) in a threaded way, a top cover (8) is arranged on the test cylinder (3) at the top of the outer tube (2) in a sealing way through a fixing bolt, and the outer tube (2) is fixedly connected with the top cover (8) in a sealing way through a chuck (9); an inner pipe adapter (24) is arranged in the outer pipe adapter (7), and an inner pipe bracket (10) is arranged on the test cylinder (3) above the top cover (8) through a fixing bolt; an inner pipe (1) is arranged in the outer pipe (2), one end of the inner pipe (1) is in threaded connection with an inner pipe adapter (24), the other end of the inner pipe (1) extends to the upper part of the top cover (8), and the inner pipe (1) extending to the upper part of the top cover (8) is connected with an inner pipe bracket (10) through a pipe clamp; a cylinder water inlet pipe (4) is arranged at one side of the test cylinder (3), and one end of the cylinder water inlet pipe (4) is communicated with the test cylinder (3); the other end of the cylinder water inlet pipe (4) is communicated with a water pool (12), the other side of the test cylinder (3) is provided with a bleeder pipe (5), and one end of the bleeder pipe (5) is communicated with the test cylinder (3); the other end of the bleeder tube (5) is communicated with the water pool (12), the lower surface of the base (6) is provided with a water inlet tube (11), and one end of the water inlet tube (11) is communicated with the inner tube (1) through an inner tube conversion joint (24); the other end of the water inlet pipe (11) is communicated with a water tank (12);
the cylinder water inlet pipe (4) is provided with a flow regulating pump B (14) and a second flowmeter (15) at intervals; a second flow control valve (16) is arranged on the cylinder water inlet pipe (4) between the flow regulating pump B (14) and the second flowmeter (15);
the inner pipe (1) extending to the upper part of the top cover (8) is communicated with the water tank (12) through the flow guide pipe (13);
a plurality of first fiber bragg grating sensors (17) are arranged on the outer wall of the inner tube (1) at intervals, and a plurality of second fiber bragg grating sensors (18) are arranged on the outer wall of the outer tube (2) at intervals; each fiber bragg grating sensor is connected with a computer through a photoelectric converter and a data acquisition instrument respectively;
a first flowmeter (19) and a flow regulating pump A (20) are arranged on the water inlet pipe (11) at intervals, and a first flow control valve (21) is arranged on the water inlet pipe (11) between the first flowmeter (19) and the flow regulating pump A (20);
a drain hole (22) is arranged on the base (6) between the outer tube adapter (7) and the inner tube adapter (24), and the drain hole (22) is communicated with the outer tube (2) through the outer tube adapter (7);
a plug (23) is arranged on the drain hole (22) in a threaded way.
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