CN109813523B - Viscoelastic two-phase fluid drag reduction experiment system and experiment method - Google Patents

Abstract

A viscoelastic two-phase fluid drag reduction experiment system and an experiment method are disclosed, wherein a gas-liquid mixer (9) communicated with a gas source (1) through a pipeline is provided, an air compressor (2) is arranged on the communicated pipeline, and a centrifugal pump (5) is arranged on the pipeline communicated with a circulating liquid tank and the gas-liquid mixer; one end of the electronic valve I is connected to a pipeline communicated with the centrifugal pump and the gas-liquid mixer, and the other end of the electronic valve I is connected to a pipeline communicated with the inlet end of the sampling vessel; a flow partition plate is arranged at the outlet end of the sampling vessel, and liquid flows into the rheometer through the flow partition plate; an electronic valve II, an electronic differential pressure gauge and a temperature sensor are arranged on pipelines from the inlet end to the outlet end of the pipeline I, the pipeline II and the pipeline III; the transition water tank is communicated with the circulating liquid tank through a pipeline IV; the invention can realize the gas-liquid two-phase fluid drag reduction experiment, simultaneously can greatly improve the experimental efficiency of the two-phase fluid drag reduction, has accurate experimental data, reduces the deviation rate of the experimental data, and has simple system structure and convenient process operation.

Description

A viscoelastic two-phase fluid drag reduction experimental system and experimental method

technical field

The invention relates to a viscoelastic fluid drag reduction experiment system, in particular to a viscoelastic two-phase fluid drag reduction experiment system and an experiment method, and belongs to the technical field of turbulent drag reduction in fluid mechanics.

Background technique

The control of high gas mines and outburst mines has always been a problem in the world, so gas control is one of the important means to ensure the safety of coal mining. The pumping capacity of gas pumping equipment is one of the important factors affecting the effect of mine pumping. At present, most of the research is considering the pumping equipment itself, and improving the pumping efficiency by improving the structure of the pumping equipment. The method to improve the equipment structure has reached the bottleneck at present. In fluid mechanics, polymer drag reduction as a viscoelastic fluid drag reduction is a relatively reliable and potential research direction, which can greatly improve the efficiency of pumping equipment; since the current pumping equipment is a water ring vacuum pump, its internal operation Based on the flow mechanism of gas-liquid two-phase fluid, the study of drag reduction characteristics of viscoelastic two-phase fluid has important theoretical and practical significance for preventing and controlling coal and gas outbursts.

At present, the most common way to study the drag reduction of viscoelastic fluids is the polymer drag reduction. Due to the exploitation of China's oil, most of the research is based on the turbulent drag reduction efficiency of oil-soluble polymers, and the above researches are basically carried out in experiments. It only contains a viscoelastic fluid, or use a system to monitor the generation of bubbles in the viscoelastic fluid; a Chinese invention patent published on June 19, 2018 with a publication number of CN108181205A "An oil-soluble polymer turbulent drag reduction "Efficiency measuring device", which measures the anti-torque of the disk rotation through the rotation power of the disk, and then calculates the turbulent drag reduction rate of the polymer. This design method is similar to the rotational rheometer; the rotational rheometer measures the rheological properties of viscoelastic fluids , to provide the necessary data for the development of innovative structural and functional materials. Although the functions are relatively comprehensive, it has not been able to measure the relevant drag reduction parameters after mixing the gas-liquid two-phase fluid, and has not yet been able to prove the drag reduction of the viscoelastic two-phase fluid. There is also a turbulent drag reduction measurement method using a capillary rheometer, which can measure the time for a fixed volume of additive-containing and additive-free solutions to flow out of the capillary to calculate the drag reduction efficiency, also not involving two-phase fluids.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a viscoelastic two-phase fluid drag reduction experimental system and experimental method, which can realize the gas-liquid two-phase fluid drag reduction experiment, and at the same time can greatly improve the experimental efficiency of the two-phase fluid drag reduction, and the experimental data is accurate, The deviation rate of experimental data is reduced, and the system is simple in structure and convenient in process operation.

In order to achieve the above object, the present invention provides a viscoelastic two-phase fluid drag reduction experiment system, including a viscoelastic fluid property adjustment system, a gas-liquid mixing system, a viscoelastic fluid rheology test system, a viscoelastic fluid drag reduction test system, a viscoelastic fluid Elastic fluid circulation system, data conversion and control system,

The viscoelastic fluid property adjustment system includes a circulating liquid tank, a stirrer and a constant temperature heating system arranged in the circulating liquid tank,

The gas-liquid mixing system includes a gas source and a gas-liquid mixer that communicates with the gas source through a pipeline, an air compressor is arranged on the pipeline that communicates with the gas-liquid mixer, and a centrifugal pump is arranged on the pipeline that communicates between the circulating liquid tank and the gas-liquid mixer. ;

The viscoelastic fluid rheological test system includes an electronic valve I, a sampling vessel with a baffle plate and a rheometer; one end of the electronic valve I is connected to the pipeline connecting the centrifugal pump and the gas-liquid mixer, and the electronic valve I The other end is connected to the pipeline connected to the inlet end of the sampling pan; the baffle plate is installed at the outlet end of the sampling dish, and the liquid flows into the rheometer through the baffle plate;

The viscoelastic fluid drag reduction test system includes pipeline I, pipeline II and pipeline III;

The viscoelastic fluid circulation system includes transition pool and pipeline IV;

The inlet ends of pipeline I, pipeline II and pipeline III are all connected to the outlet end of the gas-liquid mixer, and their outlet ends are all connected to the transition pool; from the inlet end of pipeline I, pipeline II and pipeline III to the outlet Electronic valve II, electronic differential pressure gauge and temperature sensor I are respectively installed on the end pipeline;

The transition pool is communicated with the circulating liquid tank through the pipeline IV;

A liquid flow meter is installed on the connecting pipeline between the centrifugal pump and the gas-liquid mixer, a gas flow meter is installed on the connecting pipeline between the air compressor and the gas-liquid mixer, and the pipeline connecting the gas-liquid mixer with the electronic valve II is equipped with a gas flow meter. temperature sensor II;

The data conversion and control system includes a central controller and a digital control system. The digital control system transmits control signals to the central controller, and the central controller controls the liquid flowmeter, gas flowmeter, electronic valve I, temperature sensor II, electronic Signal changes of valve II, electronic differential pressure gauge, temperature sensor I and constant temperature heating system;

The TR-PIV particle image velocity field instrument is connected with the digital control system through the central controller for data acquisition and processing, and monitors the instantaneous flow state of the fluid in the system.

As a further improvement of the present invention, pipeline I, pipeline II and pipeline III are all pipelines with variable diameter and shape, and the diameters of pipeline I, pipeline II and pipeline III are all between 8-15 mm. The length is between 3500-4500mm, and the shape is one of linear, wavy, and spiral; a reducing joint pipe is installed on the pipeline at the outlet end of the gas-liquid mixer connected to it; the diameter of pipeline IV is 15mm , there is a 5° inclination angle; the diameters of other pipelines are all 12mm.

As a further improvement of the present invention, the gas-liquid mixer is in the shape of an inverted trapezoid, the upper and lower bottoms are circular, the area of the upper bottom surface is larger than the area of the lower bottom surface, the cross-sectional shape perpendicular to the bottom surface is divided into two parts, and the height of the upper half is 35mm, The height of the lower half is 15mm.

As a further improvement of the present invention, the measurement range of the gas flowmeter is 0-15L/min, and the precision is 0.001L/min; the measurement range of the liquid flowmeter is 0-20L/min, and the precision is 0.01L/min; The measurement range of the electronic differential pressure gauge is 0-10pa, and the accuracy is 0.001pa; the measurement range and temperature adjustment range of temperature sensor I and temperature sensor II are 0-80 °C, and the rotational speed range of the stirrer is 0-1000r/min.

As a further improvement of the present invention, the bottom surface of the transition pool is set in a concave shape.

As a further improvement of the present invention, the electronic valve II is installed at a distance of 800-1000 mm from the outlet end of the gas-liquid mixer, the electronic differential pressure gauge is installed at a distance of 200-500 mm from the outlet end of the electronic valve II; the temperature sensor I is installed at the distance transition 300-800mm from the inlet end of the pool.

A viscoelastic two-phase fluid drag reduction experiment method, comprising the following steps:

①Weigh the polymer materials to be tested, and design polymer solutions with different ratios;

② Add the aqueous solution to the circulating liquid tank, start the stirrer, and set its speed. After the speed is stable, slowly pour the polymer material into the vortex formed by the stirring. After all the pouring is finished, wait for a few more minutes After it is evenly mixed, turn off the agitator;

③ Turn on the central controller and digital control system, adjust the temperature value of the constant temperature heating system, and wait for it to be heated to the specified temperature;

④Turn on the centrifugal pump and electronic valve II, and adjust the designed experimental pumping speed, so that the value of the liquid flow meter in the digital control system reaches the design value;

⑤Close the baffle plate, open the electronic valve I, and close the electronic valve I after the polymer solution flows to a certain height of the sampling dish;

⑥Turn on the air compressor, adjust the designed experimental pumping speed, so that the value of the gas flow meter in the digital control system reaches the design value; at the same time, open the baffle plate to make the polymer solution flow into the rheometer in an appropriate amount, and close the baffle plate ;

⑦After running for two minutes, wait until the pipeline I, pipeline II and pipeline III are filled with the fluid to be tested, that is, after each monitoring value is basically stable, start to record the data, and turn on the TR-PIV particle image velocity field instrument at the same time to record the system fluid Flow state; during operation, the rheometer can be turned on at the same time to test the rheological properties of the polymer solution;

⑧ Observe the values of liquid flow meters, gas flow meters, temperature sensors, and electronic differential pressure gauges in the digital control system; record multiple sets of data at a certain frequency to ensure the smallest data error;

⑨Stop the experiment, close the TR-PIV particle image velocity field instrument, close the experimental system through the digital control system, turn on the air compressor again, and speed up the flow of waste liquid in the experimental system. Wait for pipeline I, pipeline II, pipeline III All the liquid flowing into the transition pool, turn off the air compressor, and clean the baffle plate, sampling vessel and rheometer at the same time;

⑩Wait for all the waste liquid in the experimental system to flow into the circulating water tank, dispose of the internal waste liquid, replace it with clean water, turn on the centrifugal pump, make the clean water circulate in the system, and then clean the experimental system for five minutes, then change the water to clean again , wash three times in total; end the experiment.

Compared with the prior art, the data conversion and control system composed of a central controller and a digital control system uniformly controls the coordinated operation of each system. First, the properties of the fluid in the system are adjusted by adjusting the properties of the viscoelastic fluid. The heating system is heated to a specified temperature to create a stable environment for the experiment; then the centrifugal pump in the gas-liquid mixing system and the electronic valve II in the viscoelastic fluid drag reduction test system are turned on through the digital control system to adjust the designed experimental pumping speed. , so that the value of the liquid flow meter in the digital control system reaches the design value; manually close the baffle, open the electronic valve I through the digital control system, and close the electronic valve I after the polymer solution flows to a certain height of the sampling dish; through the digital control The system turns on the air compressor and adjusts the designed experimental pumping speed, so that the value of the gas flow meter in the digital control system reaches the design value; at the same time, the baffle plate is manually opened, so that the polymer solution flows into the rheometer in an appropriate amount, and the baffle is closed. When the monitored values are basically stable, the values of the liquid flowmeter, gas flowmeter, temperature sensor, and electronic differential pressure gauge are recorded at a certain frequency to ensure the smallest data error; that is, the present invention is controlled by a central controller and a digital control system. The above-mentioned liquid flowmeter, gas flowmeter, temperature sensor II, electronic differential pressure gauge, temperature sensor I, the signal data change of the constant temperature heating system, and the opening and closing of the control electronic valve I, electronic valve II, air compressor, and centrifugal pump are realized. The drag reduction experiment of gas-liquid two-phase fluid, and the drag reduction experiment of viscoelastic fluid under different pipe diameters and different pipe shapes can be carried out at the same time, which can greatly improve the experimental efficiency of drag reduction of two-phase fluid, the experimental data is accurate, and the deviation of experimental data is reduced. The system is simple in structure and convenient in process operation.

Description of drawings

FIG. 1 is a schematic diagram of the working principle of the present invention.

In the picture: 1. Air source, 2. Air compressor, 3. Gas flowmeter, 4. Liquid flowmeter, 5. Centrifugal pump, 6. Circulating liquid tank, 7. Stirrer, 8. Electronic valve I, 9. Gas-liquid mixer, 10, temperature sensor I, 11, pipeline I, 12, pipeline II, 13, pipeline III, 14, electronic valve II, 15, electronic differential pressure gauge, 16, transition pool, 17, central Controller, 18, digital control system, 19, pipeline IV, 20, constant temperature heating system, 21, sampling vessel, 22, baffle, 23, rheometer, 24, TR-PIV particle image velocity field instrument, 25 , temperature sensor II.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1, a viscoelastic two-phase fluid drag reduction experimental system includes a viscoelastic fluid property adjustment system, a gas-liquid mixing system, a viscoelastic fluid rheology test system, a viscoelastic fluid drag reduction test system, and a viscoelastic fluid Circulation system, data conversion and control system,

The viscoelastic fluid property adjustment system includes a circulating liquid tank 6, a stirrer 7 and a constant temperature heating system 20 arranged in the circulating liquid tank 6,

The gas-liquid mixing system includes a gas source 1 and a gas-liquid mixer 9 that communicates with the gas source 1 through a pipeline. An air compressor 2 is arranged on the pipeline that is connected to it, and a centrifugal pump 5 is arranged between the circulating liquid tank 6 and the gas-liquid mixer. on the pipeline connected to the mixer 9;

The viscoelastic fluid rheological testing system includes an electronic valve I8, a sampling vessel 21 with a baffle plate 22 and a rheometer 23; one end of the electronic valve I8 is connected to the pipeline connecting the centrifugal pump 5 and the gas-liquid mixer 9 , the other end of the electronic valve I8 is connected to the pipeline connected with the inlet end of the sampling dish 21; the baffle plate 22 is installed at the outlet end of the sampling dish 21, and the liquid flows into the rheometer 23 through the baffle plate 22;

The viscoelastic fluid drag reduction test system includes pipeline I11, pipeline II12, pipeline III13;

The viscoelastic fluid circulation system includes transition pool 16 and pipeline IV19;

The inlet ends of pipeline I11, pipeline II12 and pipeline III13 are all connected to the outlet end of the gas-liquid mixer 9, and the outlet ends are all connected to the transition pool 16; the inlet ends of pipeline I11, pipeline II12 and pipeline III13 Electronic valve II14, electronic differential pressure gauge 15, and temperature sensor I10 are respectively installed on the pipeline to the outlet end;

The transition pool 16 is communicated with the circulating liquid tank 6 through the pipeline IV19;

A liquid flow meter 4 is installed on the connecting pipeline of the centrifugal pump 5 and the gas-liquid mixer 9, a gas flow meter 3 is installed on the connecting pipeline of the air compressor 2 and the gas-liquid mixer 9, and the gas-liquid mixer 9 and the electronic valve are installed A temperature sensor II25 is installed on the pipeline connected to II14;

The data conversion and control system includes a central controller 17 and a digital control system 18. The digital control system 18 transmits control signals to the central controller 17, and the central controller 17 controls the liquid flowmeter 4, the gas flowmeter 3, and the electronic valve. I8. Signal changes of temperature sensor II25, electronic valve II14, electronic differential pressure gauge 15, temperature sensor I10 and constant temperature heating system 20;

The TR-PIV particle image velocity field instrument 24 is connected to the digital control system 18 through the central controller 17 for data acquisition and processing, and monitors the instantaneous flow state of the fluid in the system.

In order to carry out the drag reduction experiment of viscoelastic fluid under different pipe diameters and different pipe shapes at the same time, and to improve the efficiency of the drag reduction experiment of viscoelastic fluid, the present invention sets pipeline I11, pipeline II12 and pipeline III13 to have any diameter or shape. To change the pipeline, set the diameter of pipeline I11, pipeline II12 and pipeline III13 between 8-15mm and the length between 3500-4500mm. The shape of pipeline I11, pipeline II12 and pipeline III13 can be In the same way, straight line or wave shape or spiral shape are selected for both; the shape of pipeline I11, pipeline II12 and pipeline III13 can also be selected from the shape of one pipeline and the shape of the other two pipelines. For example, set the pipeline I11 as a straight line, set the pipeline II12, the pipeline III13 as a wave shape and other similar combinations; the shapes of the pipeline I11, the pipeline II12 and the pipeline III13 can be different, I11 is set to be straight, pipeline II12 is set to wavy, and pipeline III13 is set to spiral; when selecting the same pipeline, it is only necessary to take the average value; and for the convenience of pipeline I11 and pipeline II12 , Pipeline III13 is communicated with the pipeline at the outlet end of the gas-liquid mixer 9, and a reducing joint pipe is installed on the pipeline at the outlet end of the gas-liquid mixer 9 connected to it; in order to facilitate the fluid in the transition pool 16 to return to the circulation more effectively In the liquid tank 6, to avoid problems such as sedimentation and accumulation of the pipeline caused by the fluid sinking in the pipeline IV19, the diameter of the pipeline IV19 is set to 15mm, and there is an inclination angle of 5°; the diameter of the other pipelines is 12mm.

In order to fully and evenly mix the gas and the liquid and prevent the bubbles from directly condensing into large bubbles, the present invention sets the gas-liquid mixer 9 as an inverted trapezoid shape, the upper and lower bottoms are circular, and the area of the upper bottom surface is larger than that of the lower bottom surface, which is perpendicular to the The cross-sectional shape of the bottom surface is divided into two parts, the upper half is a trapezoid with a height of 35mm, and the lower half is a rectangle with a height of 15mm.

Because the larger the range of the general flowmeter, the lower the accuracy, in order to ensure that the accuracy of the experimental calculation is high enough and at the same time to ensure that the test results are within the range, the range of the temperature sensor and agitator is selected to achieve the maximum range of experimental requirements. Material waste, the present invention sets the measurement range of the gas flowmeter 3 to 0-15L/min, and the precision to 0.001L/min; the measurement range of the liquid flowmeter 4 is set to 0-20L/min, and the precision is set to 0.01L/min min; the measurement range of the electronic differential pressure gauge 15 is set to 0-10pa, and the accuracy is set to 0.001pa; the measurement range and temperature adjustment range of temperature sensor I10, temperature sensor II25 and temperature adjustment range are set to 0-80℃, and the rotational speed range of agitator 7 is set 0-1000r/min.

In order to facilitate the flow of the fluid in the transition pool 16 to the circulating liquid tank 6 and avoid the fluid in the transition pool 16 from being deposited around, the bottom surface of the transition pool 16 is set in a concave shape.

In order to prevent the electronic valve II14 from being damaged due to excessive impact by the gas-liquid mixed fluid, the electronic valve II14 is installed at a distance of 800-1000 mm from the outlet end of the gas-liquid mixer 9 in the present invention; in order to ensure that the pressure difference measurement range is fully developed In the section, remove the influence of insufficient development, and install the electronic differential pressure gauge 15 at a distance of 200-500mm from the 14 end of the electronic valve II; in order to prevent the temperature sensor from being too close to the outlet end, it is not easy to install, and at the same time avoid contact with the electronic valve. The connection section of the differential pressure gauge is too close, which will have an unstable influence on the experimental data.

A viscoelastic two-phase fluid drag reduction experiment method, comprising the following steps:

①Weigh the polymer materials to be tested, and design polymer solutions with different ratios;

② Add the aqueous solution into the circulating liquid tank 6, start the stirrer 7, set its rotational speed, and after the rotational speed is stable, slowly pour the polymer material into the vortex formed by the stirring, and wait for a few more minutes after all the pouring is finished. After minutes to make it evenly mixed, turn off the mixer 7;

③ Turn on the central controller 17 and the digital control system 18, adjust the temperature value of the constant temperature heating system 20, and wait for it to be heated to the specified temperature;

④ Turn on the centrifugal pump 5 and the electronic valve II 14, and adjust the designed experimental pumping speed, so that the numerical value of the liquid flow meter 4 in the digital control system 18 reaches the design value;

⑤Close the baffle plate 22, open the electronic valve I8, and close the electronic valve I8 after the polymer solution flows to a height of 100mm in the sampling dish 21;

⑥ Turn on the air compressor 2, adjust the designed experimental pumping speed, so that the value of the gas flow meter 3 in the digital control system 18 reaches the design value; at the same time, open the baffle plate 22, so that the polymer solution flows into the rheometer 23 in an appropriate amount , close the baffle 22;

⑦After running for two minutes, when pipeline I11, pipeline II12, and pipeline III13 are filled with the fluid to be measured, that is, after each monitoring value is basically stable, start recording data, and turn on TR-PIV particle image velocity field instrument 24 at the same time, the recording system Fluid flow state; during operation, the rheometer 23 can be turned on at the same time to test the rheological properties of the polymer solution;

⑧ Observe the values of the liquid flow meter 4, the gas flow meter 3, the temperature sensor 10, and the electronic differential pressure gauge 15 in the digital control system 18; record multiple sets of data at a certain frequency to ensure the smallest data error;

⑨ Stop the experiment, close the TR-PIV particle image velocity field instrument 24, close the experimental system through the digital control system 18, turn on the air compressor 2 again, and speed up the flow of waste liquid in the experimental system. Wait for pipeline I11, pipeline II12, All the liquid in the pipeline III13 flows into the transition tank 16, the air compressor 2 is turned off, and the baffle plate 22, the sampling vessel 21, and the rheometer 23 are cleaned at the same time;

⑩Wait for all the waste liquid in the experimental system to flow into the circulating liquid tank 6, process the internal waste liquid, replace it with clean water, turn on the centrifugal pump 5, make the clean water form a circulation in the system, and then clean the experimental system for five minutes, then replace it with The water was washed again for three times in total; the experiment was ended.

Example

①Weigh the polymer material to be tested, such as 200g of saponin powder, to make a polymer solution;

② Add the aqueous solution into the circulating liquid tank 6, start the stirrer 7, set the rotational speed of the stirrer 7 to 600 r/min, and after the stirring is stable, slowly pour the polymer material into the vortex formed by the stirring until all the pouring is completed. After waiting for a few minutes and 5-8 minutes to make it evenly mixed, turn off the mixer 7;

③ Turn on the central controller 17 and the digital control system 18, adjust the temperature value of the constant temperature heating system 20, and wait for it to be heated to a specified temperature of 35°C;

④Turn on the centrifugal pump 5 and the electronic valve II 14, and adjust the designed experimental pumping speed of 0.5m/s, so that the value of the liquid flow meter 4 in the digital control system 18 reaches the design value of 10.18L/min;

⑤Close the baffle plate 22, open the electronic valve I8, and close the electronic valve I8 after the polymer solution flows to a height of 100 mm in the sampling dish 21;

⑥Turn on the air compressor 2, and adjust its designed experimental pumping speed to 0.15m/s, so that the value of the gas flow meter 3 in the digital control system 18 reaches the design value of 1.018L/min; An appropriate amount of molecular solution flows into the rheometer 23, and the baffle plate 22 is closed;

⑦After running for two minutes, when pipeline I11, pipeline II12, and pipeline III13 are filled with the fluid to be measured, that is, after each monitoring value is basically stable, start recording data, and turn on TR-PIV particle image velocity field instrument 24 at the same time, the recording system Fluid flow state; during operation, the rheometer 23 can be turned on at the same time to test the rheological properties of the polymer solution;

⑧ Observe the values of the liquid flow meter 4, the gas flow meter 3, the temperature sensor 10, and the electronic differential pressure gauge 15 in the digital control system 18; record multiple sets of data at a certain frequency to ensure the smallest data error;

⑨ Stop the experiment, close the TR-PIV particle image velocity field instrument 24, close the experimental system through the digital control system 18, turn on the air compressor 2 again, and speed up the flow of waste liquid in the experimental system. Wait for pipeline I11, pipeline II12, All the liquid in the pipeline III13 flows into the transition tank 16, the air compressor 2 is turned off, and the baffle plate 22, the sampling vessel 21, and the rheometer 23 are cleaned at the same time;

⑩Wait for all the waste liquid in the experimental system to flow into the circulating liquid tank 6, process the internal waste liquid, replace it with clean water, turn on the centrifugal pump 5, make the clean water form a circulation in the system, and then clean the experimental system for five minutes, then replace it with The water was washed again for three times in total; the experiment was ended.

The above system can be used for drag reduction experiments of single-phase viscoelastic fluids and viscoelastic two-phase fluids, and can also be used for drag reduction experiments of gas-liquid two-phase Newtonian fluids. Just turn it off.

Claims (7)

1. a viscoelastic two-phase fluid drag reduction experiment system, is characterized in that, comprises viscoelastic fluid property adjustment system, gas-liquid mixing system, viscoelastic fluid rheology test system, viscoelastic fluid drag reduction test system, viscoelastic fluid Circulation system, data conversion and control system, The viscoelastic fluid property adjustment system comprises a circulating liquid tank (6), an agitator (7) and a constant temperature heating system (20) arranged in the circulating liquid tank (6), The gas-liquid mixing system comprises a gas source (1) and a gas-liquid mixer (9) communicated with the gas source (1) through a pipeline, and an air compressor (2), a centrifugal pump (5) are arranged on the connected pipeline ) is arranged on the pipeline communicating with the circulating liquid tank (6) and the gas-liquid mixer (9); The viscoelastic fluid rheological testing system includes an electronic valve I (8), a sampling dish (21) with a baffle plate (22), and a rheometer (23); one end of the electronic valve I (8) is connected to the centrifugal On the pipeline connecting the pump (5) with the gas-liquid mixer (9), the other end of the electronic valve I (8) is connected to the pipeline connected with the inlet end of the sampling vessel (21); At the outlet end of the dish (21), the liquid flows into the rheometer (23) through the baffle plate (22); The viscoelastic fluid drag reduction test system includes pipeline I (11), pipeline II (12), pipeline III (13); The viscoelastic fluid circulation system includes a transition pool (16) and a pipeline IV (19); The inlet ends of pipeline I (11), pipeline II (12), and pipeline III (13) are all connected to the outlet end of the gas-liquid mixer (9), and the outlet ends are all connected to the transition pool (16); Electronic valve II (14), electronic differential pressure gauge (15), temperature sensor I ( 10); The transition pool (16) is communicated with the circulating liquid tank (6) through the pipeline IV (19); A liquid flow meter (4) is installed on the connecting pipeline of the centrifugal pump (5) and the gas-liquid mixer (9), and a gas flow meter (4) is installed on the connecting pipeline of the air compressor (2) and the gas-liquid mixer (9). 3), a temperature sensor II (25) is installed on the pipeline connecting the gas-liquid mixer (9) with the electronic valve II (14); The data conversion and control system includes a central controller (17) and a digital control system (18), the digital control system (18) transmits control signals to the central controller (17), and the central controller (17) controls the liquid flow Gauge (4), gas flow meter (3), electronic valve I (8), temperature sensor II (25), electronic valve II (14), electronic differential pressure gauge (15), temperature sensor I (10) and constant temperature heating The signal change of the system (20); The TR-PIV particle image velocity field instrument (24) is connected with the digital control system (18) through the central controller (17) to perform data acquisition and processing, and monitor the instantaneous flow state of the fluid in the system. 2. A viscoelastic two-phase fluid drag reduction experiment system according to claim 1, characterized in that, pipeline I (11), pipeline II (12), pipeline III (13) are all variable diameters , the shape of the pipeline, the diameter of the pipeline I (11), the pipeline II (12), the pipeline III (13) is between 8-15mm, the length is between 3500-4500mm, the shape is straight, One of the wave shape and the spiral shape; a reducing joint pipe is installed on the pipeline at the outlet end of the gas-liquid mixer (9) connected to it; the diameter of the pipeline IV (19) is 15mm, and there is an inclination angle of 5°; other The diameter of the pipes is all 12mm. 3. a kind of viscoelasticity two-phase fluid drag reduction experiment system according to claim 1 and 2, it is characterized in that, gas-liquid mixer (9) is a kind of inverted truncated truncated shape, and the upper and lower bottoms are circular, and the upper bottom surface area is greater than The area of the lower bottom surface and the cross-sectional shape perpendicular to the bottom surface are divided into two parts, the upper half is a truncated cone with a height of 35mm, and the lower half is a cylindrical shape with a height of 15mm. 4. a kind of viscoelastic two-phase fluid drag reduction experiment system according to claim 3, is characterized in that, the measuring range of described gas flowmeter (3) is 0-15L/min, and the precision is 0.001L/min ; The measuring range of the liquid flow meter (4) is 0-20L/min, and the accuracy is 0.01L/min; the measuring range of the electronic differential pressure gauge (15) is 0-10pa, and the accuracy is 0.001pa; The temperature sensor I (10) , The measurement range and temperature adjustment range of the temperature sensor II (25) are 0-80°C, and the rotational speed range of the stirrer (7) is 0-1000r/min. 5. A viscoelastic two-phase fluid drag reduction experiment system according to claim 4, wherein the bottom surface of the transition pool (16) is set in a concave shape. 6. A viscoelastic two-phase fluid drag reduction experiment system according to claim 4, wherein the electronic valve II (14) is installed at 800-1000mm from the outlet end of the gas-liquid mixer (9) , the electronic differential pressure gauge (15) is installed at 200-500mm from the outlet end of the electronic valve II (14); the temperature sensor I (10) is installed at 300-800mm from the inlet end of the transition pool (16). 7. the experimental method of a kind of viscoelastic two-phase fluid drag reduction experimental system according to claim 1, is characterized in that, comprises the following steps: ①Weigh the polymer materials to be tested, and design polymer solutions with different ratios; ②Add the aqueous solution into the circulating liquid tank (6), start the stirrer (7), set its rotational speed, and after the rotational speed is stable, pour the polymer material into the circulating liquid tank (6) and stir it evenly, Turn off the agitator (7); 3. Turn on the central controller (17) and the digital control system (18), adjust the temperature value of the constant temperature heating system (20), and wait for it to be heated to a specified temperature; ④Turn on the centrifugal pump (5) and the electronic valve II (14), adjust the designed experimental pumping speed, so that the value of the liquid flow meter (4) in the digital control system (18) reaches the design value; ⑤Close the baffle plate (22), open the electronic valve I (8), and close the electronic valve I (8) after the polymer solution flows to a certain height in the sampling vessel (21); ⑥Turn on the air compressor (2), adjust its designed experimental pumping speed, so that the value of the gas flow meter (3) in the digital control system (18) reaches the design value; An appropriate amount of the solution flows into the rheometer (23), and the baffle plate (22) is closed; ⑦After running for two minutes, when pipeline I (11), pipeline II (12), and pipeline III (13) are filled with the fluid to be tested, start recording data, and turn on the TR-PIV particle image velocity field instrument (24) at the same time. , record the fluid flow state of the system; during operation, the rheometer (23) can be turned on at the same time to test the rheological properties of the polymer solution; ⑧ Observe the values of the liquid flowmeter (4), gas flowmeter (3), temperature sensor I (10), and electronic differential pressure gauge (15) in the digital control system (18); ⑨ Stop the experiment, close the TR-PIV particle image velocity field instrument (24), close the experimental system through the digital control system (18), turn on the air compressor (2) again, speed up the flow of waste liquid in the experimental system, wait for the pipeline All the liquids in I (11), pipeline II (12), and pipeline III (13) flow into the transition pool (16), turn off the air compressor (2), and clean the baffle plate (22) and sampling vessel (21) at the same time. ), rheometer (23); ⑩Wait for all the waste liquid in the experimental system to flow into the circulating liquid tank (6), dispose of the internal waste liquid, replace it with clean water, turn on the centrifugal pump (5), make the clean water form a circulation in the system, and then clean the experimental system 5. minutes, then changed the water to wash again, and washed three times in total; the experiment was ended.

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