Fluid-Structure Interaction Experimental Bench

Abstract

The present invention provides a fluid-solid coupling test bench. The fluid-solid coupling test bench of the present invention includes: an aeration device, a pulsating airflow generator and a first connecting pipe; the outlet of the aeration device is respectively connected to the inlet of the pulsating airflow generator and the first end of the first connecting pipe, and the outlet of the pulsating airflow generator and the second end of the first connecting pipe are respectively connected to the inlet of the experimental pipe section; the first connecting pipe is connected with a liquid adding device and a sand adding device, the liquid adding device is used to introduce liquid into the first connecting pipe, and the sand adding device is used to introduce solid into the first connecting pipe; the aeration device is used to output an airflow of a preset pressure, and the pulsating airflow generator is used to convert the airflow of a preset pressure into a pulsating airflow. In this way, when conducting a simulation experiment on the experimental pipe section, not only can an airflow containing impurities such as liquids and solids be generated, but also a pulsating airflow can be generated, thereby improving the accuracy of the simulation experiment results.

Description

Technical Field

[0001] The invention relates to the technical field of pipe column vibration experiments, and in particular to a fluid-solid coupling experimental platform. Background Art

[0002] During the development of gas wells, the high-speed natural gas flowing in the downhole pipe generates additional force on the pipe wall, which causes the pipe string to vibrate. This fluid-solid coupling vibration seriously affects the construction safety. Due to the extreme downhole environment, using traditional experiments to study the status of downhole pipeline equipment is not only risky, time-consuming, but also costly.

[0003] In the prior art, the natural environment downhole is mainly simulated by experimental equipment to simulate the operation of downhole pipe string equipment. The existing experimental equipment simulates the influence of different gas flow rates, different gas pressures and other conditions on the experimental pipe section by filling gas into the experimental pipe section.

[0004] However, during the development of gas wells, the extracted natural gas usually contains impurities such as liquids, sand and gravel solids, and the existing experimental equipment cannot simulate the impact of impure gas on the experimental pipe section, and cannot test the performance impact of impure gas on the experimental pipe section. It is quite different from the actual environment of the pipe string in the well, resulting in inaccurate simulation analysis of the pipe string performance. Summary of the invention

[0005] The invention provides a fluid-solid coupling test bench to solve the technical problem that the existing experimental equipment cannot simulate the influence of impurity-containing gas on the experimental pipe section, thereby causing inaccurate simulation analysis of pipe column performance.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention provides a fluid-solid coupling test bench, which comprises: an aeration device, a pulsating airflow generator and a first connecting pipe; the outlet of the aeration device is respectively connected with the inlet of the pulsating airflow generator and the first end of the first connecting pipe, and the outlet of the pulsating airflow generator and the second end of the first connecting pipe are respectively connected with the inlet of an experimental pipe section; the first connecting pipe is connected with a liquid adding device and a sand adding device, the liquid adding device is used to introduce liquid into the first connecting pipe, and the sand adding device is used to introduce solid into the first connecting pipe; the aeration device is used to output an airflow of a preset pressure, and the pulsating airflow generator is used to convert the airflow of the preset pressure into a pulsating airflow.

[0008] As an improvement of the above-mentioned fluid-solid coupling experimental platform of the present invention, the liquid adding device includes a first pipe joint, a nozzle, a first regulating valve and a liquid storage container, the liquid storage container is connected to the first end of the nozzle through the first regulating valve, the second end of the nozzle is connected to the first pipe joint; the first pipe joint is connected to the first connecting pipe.

[0009] As an improvement of the above-mentioned fluid-solid coupling test bench of the present invention, the sand adding equipment includes a second pipe joint, a sand adding pipe, a sand storage container and a sand adder; the sand adding pipe includes a first port, a second port and a third port, the first port is connected to the second pipe joint, and the second pipe joint is connected to the first connecting pipe; the second port is connected to the sand storage container; the sand adder is installed at the third port, and the sand adder is used to push the solid introduced into the second port into the first port.

[0010] As an improvement of the above-mentioned fluid-solid coupling test bench of the present invention, the sand adding pipe includes a sand conveying pipe section and a sand inlet pipe section, the two ends of the sand conveying pipe section are the first port and the third port respectively, one end of the sand inlet pipe section is connected to the side wall of the sand conveying pipe section, and the other end of the sand inlet pipe section is the second port; the sand adder includes a sand adding motor and a sand adding push rod, and the sand adding push rod includes a rotating shaft extending along the sand conveying pipe section and a spiral blade arranged on the rotating shaft.

[0011] As an improvement of the above-mentioned fluid-solid coupling test bench of the present invention, the pulsating airflow generator includes a second connecting pipe, a third connecting pipe, a second regulating valve and a first switch valve, the inlet of the second connecting pipe and the inlet of the third connecting pipe are respectively connected to the outlet of the gas filling equipment, and the outlet of the second connecting pipe and the outlet of the third connecting pipe are respectively connected to the inlet of the experimental pipe section; the second regulating valve is installed on the second connecting pipe, and the first switch valve is installed on the third connecting pipe; the first regulating valve is opened to a preset opening, and the first switch valve is opened and closed according to a preset time interval to generate the pulsating airflow at the inlet of the experimental pipe section.

[0012] As an improvement of the above-mentioned fluid-solid coupling test bench of the present invention, a second switch valve is installed on the first connecting pipe, and the liquid adding device and the sand adding device are located between the second switch valve and the second end of the first connecting pipe.

[0013] As an improvement of the above-mentioned fluid-solid coupling experimental platform of the present invention, the fluid-solid coupling experimental platform also includes an exciter, which is installed on the outside of the experimental pipe section and is used to apply an exciting force to the experimental pipe section.

[0014] As an improvement of the above-mentioned fluid-solid coupling test bench of the present invention, the fluid-solid coupling test bench also includes a processor and a detection component, and the detection component includes a gas flow meter, a first air pressure detector, a second air pressure detector, three acceleration sensors and a pressure sensor; the gas flow meter is installed at the outlet of the gas filling equipment, and is used to detect the amount of gas output by the gas filling equipment; the first air pressure detector is installed at the inlet of the experimental pipe section, and is used to detect the air pressure at the inlet of the experimental pipe section; the second air pressure detector is installed at the outlet of the experimental pipe section, and is used to detect the pressure at the outlet of the experimental pipe section; the three acceleration sensors are installed on the experimental pipe section at intervals along the length direction of the experimental pipe section, and are used to detect the acceleration of the experimental pipe section; the pressure sensor is installed on the experimental pipe section, and is used to detect the axial force of the experimental pipe section; the processor is electrically connected to the gas flow meter, the first air pressure detector, the second air pressure detector, the three acceleration sensors and the pressure sensor, respectively.

[0015] As an improvement of the above-mentioned fluid-solid coupling test bench of the present invention, the fluid-solid coupling test bench includes a supporting platform, a fourth connecting pipe, a fifth connecting pipe and a pressure relief tank; the supporting platform includes a plurality of connecting components, and the inlets of the plurality of connecting components are respectively connected to the outlet of the pulsating airflow generator and the second end of the first connecting pipe through the fourth connecting pipe; the outlets of the plurality of connecting components are connected to the pressure relief tank through the fifth connecting pipe; and a third switch valve is provided on the fifth connecting pipe.

[0016] As an improvement of the above-mentioned fluid-solid coupling experimental platform of the present invention, the connecting component includes a third pipe joint, a fourth pipe joint, a fourth switch valve and a fifth switch valve; the outlet of the third pipe joint and the inlet of the fourth pipe joint are respectively connected to the two ends of the experimental pipe section; the fourth switch valve is installed between the inlet of the third pipe joint and the outlet of the fourth connecting pipe, and the fifth switch valve is installed between the outlet of the fourth pipe joint and the inlet of the fifth connecting pipe.

[0017] The fluid-solid coupling test bench provided by the present invention includes an aeration device, a pulsating airflow generator and a first connecting pipe; the outlet of the aeration device is respectively connected to the inlet of the pulsating airflow generator and the first end of the first connecting pipe, and the outlet of the pulsating airflow generator and the second end of the first connecting pipe are respectively connected to the inlet of the experimental pipe section; the pulsating airflow generator and the first connecting pipe are respectively connected to the aeration device, and the pulsating airflow generator and the first connecting pipe are respectively connected to the experimental pipe section. When only a pulsating airflow or an airflow containing liquid or solid is required, the pulsating airflow generator and the first connecting pipe do not interfere with each other, which is beneficial to improving the accuracy of the experimental effect. The first connecting pipe is connected with a liquid adding device and a sand adding device, the liquid adding device is used to introduce liquid into the first connecting pipe, and the sand adding device is used to introduce solid into the first connecting pipe; by arranging the liquid adding device and the sand adding device on the first connecting pipe, an airflow containing liquid and solid impurities is generated, so that the simulation experiment is closer to the underground environment, and the accuracy of the simulation experiment is improved. The gas filling device is used to output an airflow of a preset pressure, and the pulsating airflow generator is used to convert the airflow of a preset pressure into a pulsating airflow; by arranging the gas filling device to output the airflow of a preset pressure, the pressure of the airflow can be adjusted within a larger range during the experiment, and thus it can also simulate the situation of higher gas pressure, thereby improving the applicability of the fluid-solid coupling test bench of the present invention; and, by generating a pulsating airflow through the pulsating airflow generator, the unstable state of the gas in the well is simulated, thereby further improving the accuracy of the simulation experiment.

[0018] In addition to the technical problems solved by the present invention, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the fluid-solid coupling test bench provided by the present invention, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments of the present invention or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only part of the embodiments of the present invention. These drawings and text descriptions are not intended to limit the scope of the concept of the present disclosure in any way, but to illustrate the concepts of the present disclosure to those skilled in the art by referring to specific embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of a fluid-solid coupling experimental platform provided in an embodiment of the present invention;

[0021] Figure 2A schematic diagram of the structure of an experimental pipe section provided in an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the structure of a liquid adding device provided in an embodiment of the present invention;

[0023] Figure 4 A schematic structural diagram of a sand adding device provided in an embodiment of the present invention.

[0024] Description of reference numerals:

[0025] 11: air compressor; 12: air storage tank; 13: pressure relief tank; 14: third regulating valve; 2: pulsating air flow generator; 21: second connecting pipe; 211: second regulating valve; 22: third connecting pipe; 221: first switch valve; 3: first connecting pipe; 31: second switch valve; 4: experimental pipe section; 41: exciter; 42: axial force tensioning mechanism; 421: tension anchor; 422: tension bolt; 51: gas flow meter; 52: first air pressure detector; 53: second air pressure detector; 54: acceleration sensor; 55: pressure sensor; 61: third pipe joint; 62: fourth pipe : pipe joint; 63: fourth switch valve; 64: fifth switch valve; 71: fourth connecting pipe; 72: fifth connecting pipe; 721: third switch valve; 8: liquid adding equipment; 81: first pipe joint; 82: nozzle; 83: first regulating valve; 84: liquid storage container; 85: gas filling port; 86: liquid filling port; 9: sand adding equipment; 91: second pipe joint; 92: sand adding pipe; 921: sand conveying pipe section; 922: sand inlet pipe section; 923: first port; 924: second port; 925: third port; 93: sand storage container; 94: sand adder; 941: sand adding motor; 942: sand adding push rod. DETAILED DESCRIPTION

[0026] In the prior art, the natural environment downhole is mainly simulated by experimental equipment to simulate and study the operating conditions of downhole tubular equipment. However, in the process of gas well development, the extracted natural gas usually contains impurities such as liquids, sand and gravel solids, and the existing experimental equipment cannot simulate the impact of impure gas on the experimental pipe section, and cannot test the performance impact of impure gas on the experimental pipe section. It is quite different from the actual environment of the tubular in the well, resulting in inaccurate simulation analysis of tubular performance.

[0027] In view of this, the present invention provides a fluid-solid coupling test bench, which, by arranging a liquid adding device, a sand adding device, a pulsating airflow generator and an exciter, can not only generate an airflow containing impurities such as liquid and solid, but also generate a pulsating airflow when conducting a simulation experiment on an experimental pipe section, and can apply an exciting force to the experimental pipe section, thereby improving the accuracy of the simulation experiment results.

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0029] Figure 1 A schematic diagram of the structure of a fluid-solid coupling experimental platform provided in an embodiment of the present invention, Figure 2 A schematic diagram of the structure of an experimental pipe section provided in an embodiment of the present invention.

[0030] like Figure 1 and Figure 2 As shown, the present invention provides a fluid-solid coupling test bench, which includes: an aeration device 1, a pulsating airflow generator 2 and a first connecting pipe 3; the outlet of the aeration device 1 is connected to the inlet of the pulsating airflow generator 2 and the first end of the first connecting pipe 3 respectively, and the outlet of the pulsating airflow generator 2 and the second end of the first connecting pipe 3 are connected to the inlet of the experimental pipe section 4 respectively; the first connecting pipe 3 is connected with a liquid adding device 8 and a sand adding device 9, the liquid adding device 8 is used to introduce liquid into the first connecting pipe 3, and the sand adding device 9 is used to introduce solid into the first connecting pipe 3; the aeration device 1 is used to output an airflow of a preset pressure, and the pulsating airflow generator 2 is used to convert the airflow of the preset pressure into a pulsating airflow.

[0031] The gas filling device 1 is used to generate the airflow required for the experiment and can discharge the generated airflow. The gas filling device 1 may include an air compressor, which generates an airflow of a preset pressure under the action of the air compressor. The gas filling device 1 may also include a high-pressure gas tank, and a pressure valve is set at the outlet of the high-pressure gas tank to control the output airflow pressure by controlling the pressure valve. In a specific implementation, refer to Figure 1 The gas filling device 1 includes an air compressor 11 and an air tank 12. The air compressor 11 is used to generate compressed gas, and the air outlet of the air compressor 11 is connected to the inlet of the air tank 12. The air compressor 11 stores the generated compressed gas in the air tank 12. The outlet of the air tank 12 is respectively connected to the inlet of the pulsating airflow generator 2 and the first end of the first connecting pipe 3. In this way, the high-pressure gas generated by the air compressor 11 is stored in the air tank 12, which can improve the stability of the airflow output from the outlet of the air tank 12, and avoid the unstable airflow output from the air compressor 11 affecting the experimental effect.

[0032] In order to control the pressure of the airflow output from the gas storage tank 12, a third regulating valve 14 is provided at the outlet of the gas storage tank 12. Optionally, the third regulating valve 14 is a regulating gate valve; the discharge amount of the compressed gas in the gas storage tank 12 can be controlled by the third regulating valve 14, so as to output an airflow of a preset pressure. It can be understood that the third regulating valve 14 can be a mechanical valve, that is, the user can manually adjust the opening of the third regulating valve 14; the third regulating valve 14 can be a solenoid valve, that is, the opening of the third regulating valve 14 can be controlled by the processor of the fluid-solid coupling experimental platform of the present invention.

[0033] The pulsating airflow generator 2 is used to generate pulsating airflow, wherein the so-called "pulsating airflow" refers to the periodic changes in the flow velocity and pressure of the airflow. Production practice shows that pulsating airflow is the main cause of pipeline vibration, so it is particularly important to introduce pulsating airflow when conducting a simulation experiment on the experimental pipe section 4. Since the generation of pulsating airflow requires periodic changes in the airflow, pulsating airflow can be generated by a mechanism that can move periodically. There can be many types of pulsating airflow generators 2, for example, a cam-type pulsating airflow generator, a crank rocker-type pulsating airflow generator, etc.; for another example, two parallel valves are set in the airflow pipeline, and a pulsating airflow is formed by controlling the switch and opening of the valve.

[0034] The first connecting pipe 3 is provided with a liquid adding device 8 and a sand adding device 9. The installation positions of the liquid adding device 8 and the sand adding device 9 are not required. For example, Figure 1 , the liquid adding device 8 is close to the first end of the first connecting pipe 3, and the sand adding device 9 is located between the liquid adding device 8 and the second end of the first connecting pipe 3; for another example, the sand adding device 9 is close to the first end of the first connecting pipe 3, and the liquid adding device 8 is located between the sand adding device 9 and the second end of the first connecting pipe 3.

[0035] It can be understood that the liquid adding device 8 and the sand adding device 9 do not affect each other, that is, the airflow at the preset pressure may contain only liquid; or, the airflow at the preset pressure may contain only solid; or, the airflow at the preset pressure may contain both solid and liquid.

[0036] By setting up the liquid adding device 8, the sand adding device 9 and the pulsating airflow generator 2, when conducting a simulation experiment on the experimental pipe section 4, not only can an airflow containing impurities such as liquid and solid be generated, but also a pulsating airflow can be generated, which not only improves the accuracy of the simulation experiment results, but also has a simple structure and is convenient for production operation.

[0037] Figure 3 The structural diagram of the liquid adding device provided in the embodiment of the present invention is shown in FIG. Figure 3In some embodiments, the liquid adding device 8 includes a first pipe joint 81, a nozzle 82, a first regulating valve 83 and a liquid storage container 84. The liquid storage container 84 is connected to the first end of the nozzle 82 through the first regulating valve 83, and the second end of the nozzle 82 is connected to the first pipe joint 81; the first pipe joint 81 is connected to the first connecting pipe 3.

[0038] Among them, the first pipe joint 81 is connected to the first connecting pipe 3, and there can be multiple connection methods. For example, an external thread is set on one of the first pipe joint 81 and the first connecting pipe 3, and an internal thread is set on the other of the first pipe joint 81 and the first connecting pipe 3, and the first pipe joint 81 and the first connecting pipe 3 are connected by threads; for another example, the first pipe joint 81 and the first connecting pipe 3 are connected by flanges, etc.

[0039] The second end of the nozzle 82 is connected to the first pipe joint 81. Specifically, the second end of the nozzle 82 is provided with an external thread, and the side wall of the first pipe joint 81 is provided with a threaded hole. The second end of the nozzle 82 is threadedly connected to the threaded hole, so that the nozzle 82 is installed on the first pipe joint 81. The connection method is stable and reliable. The nozzle 82 is a tubular body. Figure 3 The opening of the first end of the nozzle 82 is larger and the opening of the second end is smaller, so that the flow area of ​​the liquid in the nozzle 82 is suddenly reduced, which is conducive to increasing the liquid spraying speed. The connection method between the second end of the nozzle 82 and the first pipe joint 81 and the connection method between the first end of the nozzle 82 and the first regulating valve 83 can be threaded connection, welding, etc., which is not limited in this embodiment.

[0040] The first regulating valve 83 can control the amount of liquid added to the first pipe joint 81 by the liquid storage container 84. Optionally, the first regulating valve 83 is a regulating ball valve. The first end of the first regulating valve 83 is connected to the nozzle 82, and the connection method thereof can be welding, threaded connection, etc.; the second end of the first regulating valve 83 is connected to the liquid storage container 84, and the connection method thereof can also be welding, threaded connection, etc. The first regulating valve 83 can also be connected to the processor of the present invention for communication. Controlling the first regulating valve 83 by the processor is not only simple to operate, but also can avoid manual operation errors, making the control of the amount of liquid added to the first pipe joint 81 more accurate.

[0041] The liquid storage container 84 is used to store liquid, and its structure and shape can be various, for example, the liquid storage container 84 can be barrel-shaped, spherical, square barrel-shaped, etc. Optionally, refer to Figure 3 The liquid storage container 84 is a transparent measuring cup, which not only allows the user to directly observe the changes in the liquid in the liquid storage container 84 , but also allows the user to observe and measure the amount of liquid added to the first pipe connector 81 .

[0042] Reference Figure 3The liquid storage container 84 is also provided with an air filling port 85 and a liquid filling port 86. The liquid filling port 86 can facilitate the addition of liquid into the liquid storage container 84. A one-way air inlet valve is also provided at the air filling port 85. When the air pressure in the first pipe joint 81 is higher than the air pressure in the liquid storage container 84, the liquid storage container 84 will be in a negative pressure state, so that liquid cannot be added to the first pipe joint 81. By setting the one-way air inlet valve to fill the liquid storage container 84 with gas, the air pressure in the liquid storage container 84 is greater than or equal to the air pressure in the first pipe joint 81, thereby ensuring that the liquid can be smoothly added to the first pipe joint 81.

[0043] By arranging the first regulating valve 83 between the nozzle 82 and the liquid storage container 84, the amount of liquid added to the first connecting pipe 3 by the liquid adding device 8 can be controlled by only adjusting the opening of the first regulating valve 83, which is simple and convenient to operate.

[0044] Figure 4 The structural diagram of the sand adding device provided by the embodiment of the present invention is shown in FIG. Figure 4 In some embodiments, the sand adding device 9 includes a second pipe joint 91, a sand adding pipe 92, a sand storage container 93 and a sand adder 94; the sand adding pipe 92 includes a first port 923, a second port 924 and a third port 925, the first port 923 is connected to the second pipe joint 91, and the second pipe joint 91 is connected to the first connecting pipe 3; the second port 924 is connected to the sand storage container 93; the sand adder 94 is installed at the third port 925, and the sand adder 94 is used to push the solid introduced into the second port 924 into the first port 923.

[0045] Among them, the second pipe joint 91 is connected to the first connecting pipe 3, and there can be multiple connection methods. For example, an external thread is set on one of the second pipe joint 91 and the first connecting pipe 3, and an internal thread is set on the other of the second pipe joint 91 and the first connecting pipe 3, and the second pipe joint 91 and the first connecting pipe 3 are connected by threads; for another example, the second pipe joint 91 and the first connecting pipe 3 are connected by flanges, etc.

[0046] Optionally, the first end of the sand adding pipe 92 is connected to the second pipe joint 91, and the connection method can be threaded connection, welding, plug connection, etc. The sand adding pipe 92 can be a straight pipe, or a curved pipe; the sand adding pipe 92 can be an integral part, or can be welded by multiple short pipes, which is not limited in this embodiment.

[0047] Reference Figure 4The sand adding pipe 92 includes a first port 923, a second port 924 and a third port 925. Optionally, the first port 923 is circular and located at the first end of the sand adding pipe 92. The first port 923 is connected to the second pipe joint 91, that is, the solid in the sand adding pipe 92 is added to the second pipe joint 91 through the first port 923. Optionally, the second port 924 is circular and can be an opening on the side wall of the sand adding pipe 92. The second port 924 is connected to the sand storage container 93, so that the solid in the sand storage container 93 enters the sand adding pipe 92 through the second port 924; refer to Figure 4 A joint may also be provided at the opening on the side wall of the sand adding pipe 92, and the end of the joint away from the side wall of the sand adding pipe 92 is a second port 924; the second port 924 is connected to the sand storage container 93, and the connection method may be welding, socket connection, etc. The third port 925 is located at the second end of the sand adding pipe 92, and a sand adder 94 is installed at the third port 925 of the sand adding pipe 92, and the sand adder 94 is used to push the solid introduced from the second port 924 into the first port 923. Optionally, the third port 925 is circular.

[0048] The sand storage container 93 is used to store solids. The solids in this embodiment specifically refer to solid particles, which can be sand, metal particles, etc. The sand storage container 93 can have various structural shapes. For example, the sand storage container 93 can be in the shape of a barrel, a sphere, a square barrel, etc. Optionally, refer to Figure 4 The sand storage container 93 is a transparent barrel, and a scale mark is set on the sand storage container 93, which is not only convenient for timely adding liquid to the sand storage container 93, but also can accurately count the amount of solid added to the second pipe joint 91. The sand storage container 93 is also provided with a sand adding port to facilitate adding solids to the sand storage container 93. An air inlet can also be set on the sand storage container 93, and a one-way air inlet valve is set on the air inlet to increase the pressure in the sand storage container 93, so that the solid can be smoothly added to the second pipe joint 91.

[0049] The sand adder 94 is fixedly connected to the third port 925 of the sand adding pipe 92, and there are many ways to connect it. For example, the sand adder 94 is welded to the third port 925 of the sand adding pipe 92; for another example, the sand adder 94 is connected to the third port 925 of the sand adding pipe 92 through a flange. The sand adder 94 can not only add the solid in the sand adding pipe 92 to the second pipe joint 91, but also control the amount of solid added to the second pipe joint 91. The sand adder 94 can also be connected to the processor of the present invention in communication. The sand adder 94 is controlled by the processor, which is not only simple to operate, but also can avoid manual operation errors, so that the control of the amount of solid added to the second pipe joint 91 is more accurate.

[0050] By arranging three ports on the sand adding pipe 92 and arranging a sand adding device 94 on one of the ports, the structure is simple and convenient for production and processing.

[0051] In a specific implementation, the sand adding pipe 92 includes a sand conveying pipe section 921 and a sand inlet pipe section 922, the two ends of the sand conveying pipe section 921 are respectively a first port 923 and a third port 925, one end of the sand inlet pipe section 922 is connected to the side wall of the sand conveying pipe section 921, and the other end of the sand inlet pipe section 922 is a second port 924; the sand adder 94 includes a sand adding motor 941 and a sand adding push rod 942, and the sand adding push rod 942 includes a rotating shaft extending along the sand conveying pipe section 921 and a spiral blade arranged on the rotating shaft.

[0052] Optionally, the sand conveying pipe section 921 is a round pipe, and the sand conveying pipe section 921 can be a straight round pipe; Figure 4 The sand conveying pipe section 921 may also be formed by connecting two straight round pipes at a certain angle to each other. Optionally, the first end of the sand conveying pipe section 921 is perpendicular to the side wall of the second pipe joint 91 to facilitate the connection between the sand conveying pipe section 921 and the second pipe joint 91.

[0053] One end of the sand inlet pipe section 922 is connected to the side wall of the sand transporting pipe section 921, that is, the sand inlet pipe section 922 is connected to the sand transporting pipe section 921. The connection between the sand inlet pipe section 922 and the sand transporting pipe section 921 can be welding, threaded connection, etc. The second end of the sand inlet pipe section 922 is a second port 924. Optionally, the shape of the second port 924 is the same as the cross-sectional shape of the sand storage container 93, which is conducive to improving the tightness of the connection between the sand inlet pipe section 922 and the sand storage container 93.

[0054] The sand adding device 94 includes a sand adding motor 941, which is fixedly connected to the second port 924 of the sand feeding pipe section 922. The connection mode can be various, for example, the sand adding motor 941 is connected to the sand feeding pipe section 922 by a flange; for another example, the sand adding motor 941 is connected to the sand feeding pipe section 922 by screws, etc. In addition, a seal is also provided at the connection between the sand adding motor 941 and the sand feeding pipe section 922 to ensure the sealing between the sand adding motor 941 and the sand feeding pipe section 922. The sand adding motor 941 can be a stepping motor, a servo motor, etc. The sand adding motor 941 can also be connected to the processor for communication, and the sand adding motor 941 is controlled by the processor, which is not only simple to operate, but also can avoid manual operation errors, so that the control of the amount of solid added to the second pipe joint 91 is more accurate.

[0055] The sand feeder 94 further includes a sand feeder push rod 942, which can be connected to the sand feeder motor 941 via a coupling, which is beneficial to reducing the vibration of the sand feeder 94 during operation. The sand feeder push rod 942 includes a rotating shaft and a spiral blade disposed on the rotating shaft, and the rotating shaft is optionally a circular shaft. The rotating shaft extends along the sand conveying pipe section 921, that is, referring to Figure 4 The rotating shaft extends along the X direction, which is conducive to conveying the solid in the sand conveying pipe section 921 to the second pipe joint 91. The spiral blades are arranged at intervals along the X direction on the outer side of the rotating shaft. Optionally, the spiral blades are arc-shaped, and the concave surface of the spiral blades is away from the sand adding motor 941, which is conducive to conveying the solid in the sand conveying pipe section 921 to the second pipe joint 91.

[0056] By setting up a sand adding motor 941 and a sand adding push rod 942, and the sand adding push rod 942 includes a rotating shaft extending along the sand conveying pipe section 921 and spiral blades arranged on the rotating shaft, not only can the solids in the sand conveying pipe section 921 be transported to the second pipe joint 91; and, in the process of high-speed rotation driven by the rotating shaft, the spiral blades also have a certain refining effect on larger solid particles, which is beneficial to prevent the sand conveying pipe section 921 from being blocked, thereby further improving the solid conveying efficiency.

[0057] In another specific implementation, the sand adding pipe 92 includes a sand transport pipe section 921 and a sand inlet pipe section 922. The first end of the sand transport pipe section 921 is a first port 923. The second end of the sand transport pipe section 921 is connected to the first end of the sand inlet pipe section 922. The second end of the sand inlet pipe section 922 is a third port 925. A second port 924 is provided on the side wall of the sand inlet pipe section 922. The structure is simple and the processing is convenient.

[0058] In some embodiments, the pulsating airflow generator 2 includes a second connecting pipe 21, a third connecting pipe 22, a second regulating valve 211 and a first switch valve 221. The inlet of the second connecting pipe 21 and the inlet of the third connecting pipe 22 are respectively connected to the outlet of the gas filling equipment 1, and the outlet of the second connecting pipe 21 and the outlet of the third connecting pipe 22 are respectively connected to the inlet of the experimental pipe section 4; the second regulating valve 211 is installed on the second connecting pipe 21, and the first switch valve 221 is installed on the third connecting pipe 22; the second regulating valve 211 is opened to a preset opening, and the first switch valve 221 is opened and closed at a preset time interval to generate a pulsating airflow at the inlet of the experimental pipe section 4.

[0059] The inlet of the second connecting pipe 21 is connected to the outlet of the gas filling device 1, and the outlet of the second connecting pipe 21 is connected to the inlet of the experimental pipe section 4, that is, the airflow of the preset pressure output by the gas filling device 1 can enter the experimental pipe section 4 through the second connecting pipe 21. A second regulating valve 211 is installed on the second connecting pipe 21, and optionally, the second regulating valve 211 is a regulating gate valve. The second regulating valve 211 can be opened to different openings, and the gas flow entering the second connecting pipe 21 can be controlled by adjusting the second regulating valve 211.

[0060] The inlet of the third connecting pipe 22 is connected to the outlet of the gas filling device 1, and the outlet of the third connecting pipe 22 is connected to the inlet of the experimental pipe section 4, that is, the airflow of the preset pressure output by the gas filling device 1 can enter the experimental pipe section 4 through the third connecting pipe 22. The third connecting pipe 22 is equipped with a first switch valve 221. Optionally, the first switch valve 221 is a pneumatic butterfly valve, and the pneumatic butterfly valve has a fast response speed, that is, the time required to open or close the pneumatic butterfly valve is short. The first switch valve 221 can be opened or closed. When the first switch valve 221 is opened, the airflow of the preset pressure can enter the experimental pipe section 4 through the third connecting pipe 22; when the first switch valve 221 is closed, the airflow of the preset pressure cannot enter the experimental pipe section 4 through the third connecting pipe 22.

[0061] When the second regulating valve 211 is opened to a preset opening and the first switch valve 221 is opened, the airflow of the preset pressure can enter the experimental pipe section 4 through the second connecting pipe 21 and the third connecting pipe 22 at the same time; when the second regulating valve 211 is opened to a preset opening and the first switch valve 221 is closed, the airflow of the preset pressure can only enter the experimental pipe section 4 through the second connecting pipe 21. When the first switch valve 221 is opened and closed at a preset time interval, the amount of air entering the experimental pipe section 4 will also increase or decrease according to the preset time, and the air pressure in the experimental pipe section 4 will also increase or decrease accordingly. This periodic change causes the gas entering the experimental pipe section 4 to produce a pulsation phenomenon.

[0062] It should be noted here that the second regulating valve 211 can be a mechanical valve, that is, the user can manually adjust the opening of the second regulating valve 211; the second regulating valve 211 can be a solenoid valve, that is, the opening of the second regulating valve 211 can be controlled by the processor of the fluid-solid coupling experimental platform of the present invention.

[0063] By providing the second regulating valve 211 and the first switch valve 221 , and by the cooperation between the second regulating valve 211 and the first switch valve 221 to generate a pulsating airflow, not only the structure is simple, but also the operation is convenient.

[0064] In some embodiments, a second switch valve 31 is installed on the first connecting pipe 3 , and the liquid adding device 8 and the sand adding device 9 are located between the second switch valve 31 and the second end of the first connecting pipe 3 .

[0065] Optionally, the second switch valve 31 is a stop valve. When the second switch valve 31 is opened, the airflow of the preset pressure output by the gas adding device 1 can enter the experimental pipe section 4 through the first connecting pipe 3, and the liquid adding device 8 can make the airflow flowing through the experimental pipe section 4 contain liquid by passing liquid into the first connecting pipe 3, and the sand adding device 9 can make the airflow flowing through the experimental pipe section contain solid by passing solid into the first connecting pipe 3.

[0066] By setting the second switch valve 31 on the first connecting pipe 3, when there is no need to simulate the influence of the liquid-containing and solid-containing airflow on the experimental pipe section 4, it is avoided that when the pulsating airflow generator 2 generates a pulsating airflow, the airflow generated by the aeration equipment 1 flows through the first connecting pipe 3 and affects the pulsating airflow.

[0067] In some embodiments, the fluid-solid coupling experimental platform further includes a vibrator 41 , which is installed on the outside of the experimental pipe section 4 , and is used to apply an exciting force to the experimental pipe section 4 .

[0068] The vibrator 41 is installed on the outside of the experimental pipe segment 4. There are many ways to install the vibrator 41. For example, the vibrator 41 can be directly connected to the outside of the experimental pipe segment 4 by means of a clamp connection, welding, etc.; for another example, the vibrator 41 can be fixed on the same mounting surface as the supporting mechanism of the experimental pipe segment 4, so that the vibrator 41 is in close contact with the outside of the experimental pipe segment 4. The vibrator 41 can be located at both ends of the experimental pipe segment 4, or the vibrator 41 can be located in the middle of the experimental pipe segment 4. Those skilled in the art can simulate the effects of different external excitation forces on the performance of the experimental pipe segment 4 by changing the position of the vibrator 41. This embodiment does not limit the specific model of the vibrator 41.

[0069] By installing a vibration exciter 41 on the outside of the experimental pipe section 4, the experimental pipe section 4 can obtain a certain amount of vibration, thereby simulating the situation where the pipeline equipment is disturbed by the outside world underground, and further improving the accuracy of the simulation experiment.

[0070] In a specific implementation, the fluid-solid coupling test bench also includes a processor and a detection component, the detection component includes a gas flow meter 51, a first air pressure detector 52, a second air pressure detector 53, three acceleration sensors 54 and a pressure sensor 55; the gas flow meter 51 is installed at the outlet of the gas filling equipment 1, and is used to detect the amount of gas output by the gas filling equipment 1; the first air pressure detector 52 is installed at the inlet of the experimental pipe section 4, and is used to detect the air pressure at the inlet of the experimental pipe section 4; the second air pressure detector 53 is installed at the outlet of the experimental pipe section 4, and is used to detect the pressure at the outlet of the experimental pipe section 4; the three acceleration sensors 54 are installed on the experimental pipe section 4 at intervals along the length direction of the experimental pipe section 4, and are used to detect the acceleration of the experimental pipe section 4; the pressure sensor 55 is installed on the experimental pipe section 4, and is used to detect the axial force of the experimental pipe section 4; the processor is electrically connected to the gas flow meter 51, the first air pressure detector 52, the second air pressure detector 53, the three acceleration sensors 54 and the pressure sensor 55 respectively.

[0071] Optionally, the gas flow meter 51 may be a gas turbine flow meter. Figure 1The gas flow meter 51 is installed at the outlet of the gas filling device 1, and a third regulating valve 14 is provided between the gas filling device 1 and the gas flow meter 51, and the amount of gas passing through the third regulating valve 14 can be measured by the gas flow meter 51. By providing the gas flow meter 51, the amount of gas entering the experimental pipe section 4 can be controlled at any time, and the gas flow rate and gas pressure entering the experimental pipe section 4 can be conveniently controlled.

[0072] Reference Figure 1 , the first air pressure detector 52 is installed on the pipe at the inlet of the experimental pipe section 4, and an installation port is provided on the pipe at the inlet of the experimental pipe section 4. The first air pressure detector 52 is connected to the pipe at the inlet of the experimental pipe section 4 through the installation port, and the connection method can be welding, threaded connection, etc.; the second air pressure detector 53 is installed on the pipe at the outlet of the experimental pipe section 4, and an installation port is provided on the pipe at the outlet of the experimental pipe section 4. The first air pressure detector 52 is connected to the pipe at the outlet of the experimental pipe section 4 through the installation port, and the connection method can be welding, threaded connection, etc. This embodiment does not limit the specific models of the first air pressure detector 52 and the second air pressure detector 53. By setting the first air pressure detector 52 and the second air pressure detector 53, the air pressure at the inlet of the experimental pipe section 4 and the air pressure at the outlet of the experimental pipe section 4 can be measured and compared, which is convenient for understanding the pressure changes of the fluid-solid coupling experimental bench during the experiment.

[0073] Optionally, in this embodiment, at least three acceleration sensors 54 are provided, and at least three acceleration sensors 54 are respectively provided at the two end parts and the middle part of the outer side surface of the experimental pipe section 4 to respectively measure the acceleration of the experimental pipe section 4 when it vibrates. At least three acceleration sensors 54 can be connected to the outside of the experimental pipe section by sleeved at least three clamping rings on the experimental pipe section 4; at least three corresponding mounting grooves can also be provided on the experimental pipe section 4, and at least three acceleration sensors 54 can be clamped in the corresponding mounting grooves, etc. The acceleration of the experimental pipe section 4 is measured, and the result is imported into the processor, and the displacement change of the experimental pipe section 4 can be obtained through a preset algorithm program. Measuring the vibration of the experimental pipe section 4 by the acceleration sensor 54 not only has an accurate result, but also the provision of at least three acceleration sensors 54 further improves the measurement result.

[0074] Optional, see Figure 2 A support frame is arranged outside the test pipe section 4, and there is a gap between the support frame and the joint of the test pipe section 4. The pressure sensor 55 can be clamped in the gap between the support frame and the joint of the test pipe section 4. The test pipe section 4 is also provided with an axial force tensioning mechanism 42, which includes a tension anchor frame 421 and a tensioning bolt 422. Figure 2The top end of the tension anchor 421 is sleeved on the outside of the experimental pipe section 4, and the bottom end of the tension anchor 421 is fixed on the ground or the mounting platform. The tension anchor 421 is provided with a first threaded hole, and the experimental pipe section 4 is provided with a second threaded hole matched with the first threaded hole. When the tensioning bolt 422 is inserted into the first threaded hole and the second threaded hole, the tightening degree of the tensioning bolt 422 can apply different axial forces to the experimental pipe section 4. The pressure sensor 55 is used to measure the axial force on the experimental pipe section 4. By setting the pressure sensor 55 and the axial force tensioning mechanism 42, the simulation experiment is closer to the real environment, which is conducive to improving the accuracy of the simulation experiment.

[0075] The fluid-solid coupling experimental platform also includes a processor, which is electrically connected to the gas flow meter 51, the first air pressure detector 52, the second air pressure detector 53, the three acceleration sensors 54 and the pressure sensor 55, that is, the processor can receive the data measured by the gas flow meter 51, the first air pressure detector 52, the second air pressure detector 53, the three acceleration sensors 54 and the pressure sensor 55, and analyze and process the measurement results, which is not only conducive to controlling the experiment, but also makes the experimental results clearly visible.

[0076] In a specific implementation, the fluid-solid coupling experimental platform includes a supporting platform, a fourth connecting pipe 71, a fifth connecting pipe 72 and a pressure relief tank 13; the supporting platform includes a plurality of connecting components, and the inlets of the plurality of connecting components are respectively connected to the outlet of the pulsating airflow generator 2 and the second end of the first connecting pipe 3 through the fourth connecting pipe 71; the outlets of the plurality of connecting components are connected to the pressure relief tank 13 through the fifth connecting pipe 72; and a third switch valve 721 is provided on the fifth connecting pipe 72.

[0077] The support platform is used to support the various devices of the entire fluid-solid coupling experimental platform. The support platform can be a large platform or a large platform composed of multiple small platforms. The support platform is provided with multiple grooves or protrusions to better support the various devices.

[0078] The supporting platform is also provided with a plurality of connecting components, which are installed on both sides of the experimental pipe section 4 to connect the experimental pipe section 4 to the experimental table. The connecting components can be one, two, three, etc., and one connecting component can connect one experimental pipe section 4 to the experimental table.

[0079] The first end of the fourth connecting pipe 71 is connected to the outlet of the pulsating airflow generator 2 and the second end of the first connecting pipe 3 at the same time, and optionally, the connection method is flange connection; the second end of the fourth connecting pipe 71 can be connected to the inlet of multiple connecting components at the same time, and optionally, the connection method is flange connection. By setting the fourth connecting pipe 71, the overall pipeline connection of the fluid-solid coupling experimental platform is more concise; and, referring to Figure 1, it is only necessary to set a first air pressure detector 52 on the fourth connecting pipe 71 to meet the experimental requirements, which is not only conducive to reducing production costs, but also convenient for operation.

[0080] The first end of the fifth connecting pipe 72 can be connected to the outlets of multiple connecting components at the same time, and optionally, the connection method is flange connection; the second end of the fifth connecting pipe 72 is connected to the pressure relief tank 13, and optionally, the connection method is flange connection. By setting the fifth connecting pipe 72, the overall pipeline connection of the fluid-solid coupling experimental platform is more concise; and, referring to Figure 1 It is only necessary to set a second air pressure detector 53 and a third switch valve 721 on the fifth connecting pipe 72 to meet the experimental requirements, which is not only conducive to reducing production costs, but also convenient for operation.

[0081] The fifth connecting pipe 72 is also provided with a third switch valve 721. Optionally, the third switch valve 721 is a pneumatic butterfly valve, which has a fast response speed, that is, a short time required to open or close the pneumatic butterfly valve. By controlling the instantaneous on and off of the third switch valve 721, the working conditions when the well is switched on and off can be simulated. The instantaneous on and off of the airflow can cause the experimental pipe section 4 to vibrate, making the simulation experiment closer to the actual situation, thereby making the experimental results more accurate.

[0082] The inlet of the pressure relief tank 13 is connected to the outlet of the fifth connecting pipe 72, and there are many ways to connect them. For example, the pressure relief tank 13 is connected to the fifth connecting pipe 72 through an installation interface provided on the pressure relief tank 13; for another example, the pressure relief tank 13 is connected to a section of pipe on its installation interface, and is connected to the fifth connecting pipe 72 through the pipe, etc.; by setting up the pressure relief tank 13, not only can the gas after the experiment be discharged smoothly; but also, in the event of an accident, the pressure relief tank 13 can perform emergency pressure relief to avoid equipment damage and protect the safety of the experimenters.

[0083] In some embodiments, the connecting component includes a third pipe joint 61, a fourth pipe joint 62, a fourth switch valve 63 and a fifth switch valve 64; the outlet of the third pipe joint 61 and the inlet of the fourth pipe joint 62 are respectively connected to the two ends of the experimental pipe section 4; the fourth switch valve 63 is installed between the inlet of the third pipe joint 61 and the outlet of the fourth connecting pipe 71, and the fifth switch valve 64 is installed between the outlet of the fourth pipe joint 62 and the inlet of the fifth connecting pipe 72.

[0084] Optionally, the third pipe joint 61 is in a hollow cylindrical shape. The first end of the third pipe joint 61 is connected to the fourth connecting pipe 71, and the connection method thereof can be threaded connection, flange connection, etc.; the second end of the third pipe joint 61 is connected to the experimental pipe section 4, and the connection method thereof can be threaded connection, flange connection, etc.

[0085] Optionally, the fourth pipe joint 62 is in a hollow cylindrical shape. The first end of the fourth pipe joint 62 is connected to the experimental pipe section 4, and the connection method thereof can be threaded connection, flange connection, etc.; the second end of the fourth pipe joint 62 is connected to the fifth connecting pipe 72, and the connection method thereof can be threaded connection, flange connection, etc.

[0086] The fourth switch valve 63 is installed between the inlet of the third pipe joint 61 and the outlet of the fourth connecting pipe 71, that is, the fourth switch valve 63 can be installed on the third pipe joint 61, and the fourth switch valve 63 can also be installed on the fourth connecting pipe 71. Optionally, the fourth switch valve 63 is installed on the fourth connecting pipe 71, which is simple and convenient to install. By opening or closing the fourth switch valve 63, it can be controlled whether there is airflow passing through the experimental pipe section 4. Optionally, the fourth switch valve 63 is a stop valve, which has a simple structure and low production cost.

[0087] The fifth switch valve 64 is installed between the outlet of the fourth pipe joint 62 and the inlet of the fifth connecting pipe 72, that is, the fifth switch valve 64 can be installed on the fourth pipe joint 62, and the fifth switch valve 64 can also be installed on the fifth connecting pipe 72. Optionally, the fifth switch valve 64 is installed on the fifth connecting pipe 72, which is simple and convenient to install. Optionally, the fifth switch valve 64 is a stop valve with a simple structure and low production cost. The fifth switch valve 64 can be opened or closed. When the airflow flows through the experimental pipe section 4 connected to the fifth switch valve 64, the fifth switch valve 64 is opened so that the airflow can be discharged smoothly; when the airflow does not flow through the experimental pipe section 4 connected to the fifth switch valve 64, the fifth switch valve 64 is closed to prevent the airflow from flowing back into the experimental pipe section 4 connected to the fifth switch valve 64, affecting the experimental results.

[0088] Those skilled in the art can understand that the valves provided in the embodiments of the present invention can be mechanical valves, which can be adjusted manually by the experimenter; the valves provided in the embodiments of the present invention can also be solenoid valves, and the processor of the experimental platform of the present invention can control the working state of the solenoid valves.

[0089] In the above description, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fluid-solid coupling experimental platform, characterized in that: include: Aeration equipment, a pulsating airflow generator and a first connecting pipe; The outlet of the gas filling device is respectively connected to the inlet of the pulsating airflow generator and the first end of the first connecting pipe, and the outlet of the pulsating airflow generator and the second end of the first connecting pipe are respectively connected to the inlet of the experimental pipe section; The first connecting pipe is connected with a liquid adding device and a sand adding device, the liquid adding device is used to introduce liquid into the first connecting pipe, and the sand adding device is used to introduce solid into the first connecting pipe; The gas filling device is used to output an airflow of a preset pressure, and the pulsating airflow generator is used to convert the airflow of the preset pressure into a pulsating airflow. Wherein, the pulsating airflow generator comprises a second connecting pipe, a third connecting pipe, a second regulating valve and a first switch valve, the inlet of the second connecting pipe and the inlet of the third connecting pipe are respectively connected to the outlet of the gas filling equipment, and the outlet of the second connecting pipe and the outlet of the third connecting pipe are respectively connected to the inlet of the experimental pipe section; the second regulating valve is installed on the second connecting pipe, and the first switch valve is installed on the third connecting pipe; the second regulating valve is opened to a preset opening, and the first switch valve is opened and closed according to a preset time interval so that the inlet of the experimental pipe section generates the pulsating airflow; The liquid adding device comprises a first pipe joint, a nozzle, a first regulating valve and a liquid storage container, wherein the liquid storage container is connected to the first end of the nozzle through the first regulating valve, and the second end of the nozzle is connected to the first pipe joint; the first pipe joint is connected to the first connecting pipe; The sand adding equipment comprises a second pipe joint, a sand adding pipe, a sand storage container and a sand adding device; The sand adding pipe comprises a first port, a second port and a third port, the first port is communicated with the second pipe joint, and the second pipe joint is communicated with the first connecting pipe; the second port is communicated with the sand storage container; The sand feeder is installed at the third port, and the sand feeder is used to push the solid introduced into the second port into the first port; The sand adding pipe comprises a sand conveying pipe section and a sand inlet pipe section, the two ends of the sand conveying pipe section are the first port and the third port respectively, one end of the sand inlet pipe section is connected to the side wall of the sand conveying pipe section, and the other end of the sand inlet pipe section is the second port; The sand feeder comprises a sand feeding motor and a sand feeding push rod, and the sand feeding push rod comprises a rotating shaft extending along the sand conveying pipe section and a spiral blade arranged on the rotating shaft.

2. The fluid-solid coupling test bench according to claim 1, characterized in that: A second switch valve is installed on the first connecting pipe, and the liquid adding device and the sand adding device are located between the second switch valve and the second end of the first connecting pipe.

3. The fluid-solid coupling test bench according to claim 1, characterized in that: The fluid-solid coupling experimental platform also includes a vibration exciter, which is installed on the outside of the experimental pipe section and is used to apply an exciting force to the experimental pipe section.

4. The fluid-solid coupling test bench according to claim 1, characterized in that: The fluid-solid coupling test bench also includes a processor and a detection component, wherein the detection component includes a gas flow meter, a first air pressure detector, a second air pressure detector, a pressure sensor, and at least three acceleration sensors; The gas flow meter is installed at the outlet of the gas filling equipment and is used to detect the amount of gas output by the gas filling equipment; The first air pressure detector is installed at the inlet of the experimental pipe section, and is used to detect the air pressure at the inlet of the experimental pipe section; the second air pressure detector is installed at the outlet of the experimental pipe section, and is used to detect the pressure at the outlet of the experimental pipe section; At least three acceleration sensors are installed on the experimental pipe section at intervals along the length direction of the experimental pipe section, and are used to detect the acceleration of the experimental pipe section; the pressure sensor is installed on the experimental pipe section, and is used to detect the axial force of the experimental pipe section; The processor is electrically connected to the gas flow meter, the first air pressure detector, the second air pressure detector, the pressure sensor, and at least three acceleration sensors respectively.

5. The fluid-solid coupling test bench according to claim 1, characterized in that: The fluid-solid coupling experimental platform comprises a supporting platform, a fourth connecting pipe, a fifth connecting pipe and a pressure relief tank; The supporting platform includes a plurality of connecting components, the inlets of the plurality of connecting components are respectively connected with the outlet of the pulsating airflow generator and the second end of the first connecting pipe through the fourth connecting pipe; the outlets of the plurality of connecting components are connected with the pressure relief tank through the fifth connecting pipe; and a third switch valve is provided on the fifth connecting pipe.

6. The fluid-solid coupling test bench according to claim 5, characterized in that: The connecting component includes a third pipe joint, a fourth pipe joint, a fourth switch valve and a fifth switch valve; The outlet of the third pipe joint and the inlet of the fourth pipe joint are respectively connected to two ends of the experimental pipe section; The fourth switch valve is installed between the inlet of the third pipe joint and the outlet of the fourth connecting pipe, and the fifth switch valve is installed between the outlet of the fourth pipe joint and the inlet of the fifth connecting pipe.

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