CN114323553A - System and method for generating and testing effect of high-pressure gas-liquid two-phase jet flow pattern - Google Patents
System and method for generating and testing effect of high-pressure gas-liquid two-phase jet flow pattern Download PDFInfo
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Abstract
The invention provides a system and a method for generating a high-pressure gas-liquid two-phase jet flow pattern and testing an effect, wherein the system comprises: the device comprises a two-phase jet flow type generating system, a flow type observing system and a flow type effect testing system; the two-phase jet flow pattern generation system comprises a liquid phase generation unit, a gas phase generation unit and a blender; the liquid phase generation unit and the gas phase generation unit are both communicated with a blender, and the blender is sequentially communicated with a two-phase flow pressure transmitter and a nozzle through a pipeline; the flow pattern observation system comprises a flow pattern observation tube and a camera; the flow pattern observation pipe is arranged on a pipeline between the blender and the two-phase flow pressure transmitter; the flow pattern effect test system comprises a pressure detection unit and a thermal imager. The system for generating the high-pressure gas-liquid two-phase jet flow pattern and testing the effect not only can explore the generation rules of different flow patterns of the high-pressure gas-liquid two-phase jet flow, but also can test and test the jet flow structures and the jet flow effects of different flow patterns.
Description
Technical Field
The invention belongs to the technical field of coal seam permeability improvement, and particularly relates to a system and a method for generating and testing an effect of a high-pressure gas-liquid two-phase jet flow pattern.
Background
Through development of many years, the water jet permeability increasing technology has remarkable effects in pressure relief and permeability increase of coal seams and gas extraction strengthening, and is widely applied to various large mining areas. However, the water jet permeability-increasing technology has corresponding defects, such as large water consumption, high equipment pressure and 'water lock effect' which can occur. In order to enhance the overall impact effect of the jet and improve the hydraulic rock breaking efficiency, high-efficiency jets represented by pulse jet, cavitation jet, abrasive jet and the like are generated in succession in the later stage of the 20 th century. On the basis of previous research, a forest Bo spring team provides a mode of forming high-pressure gas-liquid two-phase jet flow permeability increase by quantitative gas-phase mixing, and carries out preliminary experimental research. The structure of the gas-liquid two-phase jet flow is directly influenced by the amount of the gas doping amount in the gas-liquid two-phase jet flow, and different jet flow structures have specific striking effects, so that the study on the relationship between the gas doping amount of the gas-liquid two-phase jet flow and the flow pattern and striking effects of the gas-liquid two-phase jet flow is very important.
Disclosure of Invention
The present invention is based on the discovery and recognition by the inventors of the following facts and problems:
at present, gas-liquid two-phase jet flow is taken as a new anti-reflection technology, and corresponding theoretical research is not deep enough. What is the difference between the generation of a different flow pattern of a high-pressure gas-liquid two-phase jet and the low-pressure case? What is the difference between the jet structure and the jet effect for different flow patterns? The problems are of great significance to the further application of the high-pressure gas-liquid two-phase jet flow in coal mines or other fields.
In view of the above, an object of the present invention is to provide a system for generating and testing an effect of a high-pressure gas-liquid two-phase jet flow pattern, which mainly includes a two-phase jet flow pattern generating system, a flow pattern observing system and a flow pattern effect testing system, and can not only explore the generation rules of the high-pressure gas-liquid two-phase jet flow with different flow patterns, but also test and examine the jet flow structures and jet flow effects of different flow patterns, and provide a theoretical support for the future application of different flow patterns.
The second purpose of the invention is to provide a method for generating and testing the effect of a high-pressure gas-liquid two-phase jet flow pattern.
In order to achieve the above object, a first embodiment of the present invention provides a system for generating and testing a high-pressure gas-liquid two-phase jet flow pattern, comprising: the device comprises a two-phase jet flow type generating system, a flow type observing system and a flow type effect testing system; the two-phase jet flow pattern generation system comprises a liquid phase generation unit, a gas phase generation unit and a blender; the liquid phase generating unit and the gas phase generating unit are both communicated with a blender, and the blender is sequentially communicated with a two-phase flow pressure transmitter and a nozzle through a pipeline; the flow pattern observation system comprises a flow pattern observation tube and a camera; the flow pattern observation pipe is arranged on a pipeline between the blender and the two-phase flow pressure transmitter; the flow pattern effect test system comprises a pressure detection unit and a thermal imager; the pressure detection unit is positioned below the nozzle, and the position of the pressure detection unit relative to the nozzle is adjustable; the thermal imaging camera and the camera are independently arranged on the periphery of the pressure detection unit and the nozzle.
The system for generating and testing the flow pattern of the high-pressure gas-liquid two-phase jet flow mainly comprises a two-phase jet flow pattern generating system, a flow pattern observing system and a flow pattern effect testing system, can not only explore the generation rules of different flow patterns of the high-pressure gas-liquid two-phase jet flow, but also test and test the jet flow structures and the jet flow effects of different flow patterns, has the characteristics of intuition and comprehensiveness for researching the jet flow structures of different jet flow patterns, and provides theoretical support for the application of different flow patterns in the future.
In addition, the system for generating and testing the flow pattern of the high-pressure gas-liquid two-phase jet flow provided by the embodiment of the invention can also have the following additional technical characteristics:
in one embodiment of the invention, the liquid phase generation unit comprises a high-pressure water pump, a waterway pressure regulating valve, an overflow valve and a liquid flowmeter which are sequentially communicated by pipelines; the liquid flow meter is in communication with the blender.
In one embodiment of the invention, the gas phase generating unit comprises an air compressor, a gas storage steel cylinder, a pressure reducing valve, a gas flowmeter and a one-way valve which are sequentially communicated by a pipeline; the one-way valve is in communication with the blender.
In one embodiment of the invention, the blender comprises a blending chamber, wherein one end of the blending chamber is provided with a water channel and an air channel, and the other end of the blending chamber is provided with a gas-liquid two-phase outlet; the water channel is communicated with the liquid phase generation unit, and the gas channel is communicated with the gas phase generation unit.
In one embodiment of the invention, the water channel is arranged in parallel with the air channel.
In one embodiment of the invention, the flow pattern observation pipe is a transparent pipe, and two ends of the flow pattern observation pipe are hermetically connected with a pipeline between the blender and the two-phase flow pressure transmitter through a first flange and a second flange; the first flange and the second flange are connected together by bolts.
In one embodiment of the present invention, each of the first flange and the second flange includes a flange plate and a tubular connection portion for connecting the flow pattern observation pipe to the pipe between the blender and the two-phase flow pressure transmitter, and the tubular connection portion is integrally formed on one side surface of the flange plate, and the tubular connection portion is provided with external threads.
In one embodiment of the invention, the pressure detection unit comprises a distributed film pressure sensor and a portal frame; the distributed film pressure sensor is arranged on the portal frame, and the upper surface of the distributed film pressure sensor is over against the position where the nozzle fluid flows out.
In an embodiment of the invention, the system for generating the high-pressure gas-liquid two-phase jet flow pattern and testing the effect further comprises a computer acquisition device; the computer acquisition device is electrically connected with the distributed film pressure sensor.
In order to achieve the above object, a second embodiment of the present invention provides a method for generating and testing a high-pressure gas-liquid two-phase jet flow pattern by using the system, including the following steps:
s1, adjusting the gas phase generating unit and the liquid phase generating unit to enable the gas phase pressure and flow and the liquid phase pressure and flow entering the blender to reach the set values of the experimental scheme;
s2, recording pressure and flow data, observing the flow pattern of the two-phase jet flow in the mixed flow pattern observation pipe, shooting a jet flow form image, and recording the distribution pressure data of the jet flow sprayed out from the nozzle through a distributed film pressure sensor for subsequent analysis;
s3, continuously adjusting the doping amount and pressure of the gas, shooting the change condition of the flow pattern at the nozzle by a camera, and corresponding jet form images and jet pressure data;
and S4, recording the corresponding parameters of the shot gas-liquid two-phase flow pattern and the corresponding gas and liquid, and classifying and contrasting the recorded parameters with image data obtained by the distributed film pressure sensor to obtain conditions generated by different flow patterns and corresponding jet effects.
The advantages of the method for generating and testing the effect of the high-pressure gas-liquid two-phase jet flow pattern and the system for generating and testing the effect of the high-pressure gas-liquid two-phase jet flow pattern in the embodiment of the invention are basically the same as the advantages of the system for generating and testing the effect of the high-pressure gas-liquid two-phase jet flow pattern in the prior art, and therefore, the detailed description is omitted here.
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The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic diagram of a system for generating and testing a high-pressure gas-liquid two-phase jet flow pattern according to an embodiment of the invention.
FIG. 2 is a schematic diagram of the installation position of a flow pattern observation tube in the system for generating and testing the flow pattern of the high-pressure gas-liquid two-phase jet flow according to one embodiment of the invention.
FIG. 3 is a schematic structural diagram of a blender in a system for generating and testing a flow pattern of a high-pressure gas-liquid two-phase jet according to an embodiment of the invention.
Fig. 4 is a graph of data collected by a distributed pressure sensor in an example of a particular testing method of the present invention.
Fig. 5 is a three-dimensional graph of the high-pressure gas-liquid two-phase jet pressure of data collected by the distributed pressure sensor in a specific test method example of the invention.
Reference numerals:
1-a high-pressure water pump; 2-a waterway regulating valve; 3-a liquid flow meter; 4-an air compressor; 5-gas storage steel cylinder; 6-a pressure reducing valve; 7-a gas flow meter; 8-a blender; 801-a blending chamber; 802-water channel; 803-gas channel; 804-a gas-liquid two-phase outlet; 9-flow pattern observation tube; 10-a two-phase flow pressure transmitter; 11-a nozzle; 12-distributed thin film pressure sensors; 13-a portal frame; 14-computer acquisition devices; 15-thermal imaging camera; 16-a camera; 17-an overflow valve; 18-a first flange; 19-a second flange; 20-bolt; 21-piping between the blender and the two-phase flow pressure transmitter.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The system for generating and testing the high-pressure gas-liquid two-phase jet flow pattern and the method for generating and testing the effect of the high-pressure gas-liquid two-phase jet flow pattern according to the embodiment of the invention are described below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a system for generating and testing a high-pressure gas-liquid two-phase jet flow pattern according to an embodiment of the invention.
As shown in fig. 1, a system for generating and testing the effect of a high-pressure gas-liquid two-phase jet flow pattern comprises: the device comprises a two-phase jet flow type generating system, a flow type observing system and a flow type effect testing system; the two-phase jet flow pattern generating system comprises a liquid phase generating unit, a gas phase generating unit and a blender 8 for generating gas-liquid two-phase flow; the liquid phase generating unit and the gas phase generating unit are both communicated with a blender 8, and the blender 8 is sequentially communicated with a two-phase flow pressure transmitter 10 and a nozzle 11 through a pipeline; the flow pattern observation system comprises a flow pattern observation pipe 9 for observing the gas-liquid two-phase jet flow pattern in the pipeline in real time and a camera 16 for testing the jet flow form; the flow pattern observation pipe 16 is installed on a pipeline between the blender 8 and the two-phase flow pressure transmitter 10 for monitoring the pressure of the gas-liquid two-phase flow; the flow pattern effect test system comprises a pressure detection unit for testing the pressure distribution of the jet flow and a thermal imager 15 for testing the energy distribution of the jet flow; the pressure detection unit is positioned below the nozzle 11, and the position of the pressure detection unit relative to the nozzle 1 can be adjusted, so that the structural characteristics of the jet flow with the same flow pattern and different target distances can be obtained. The thermal imaging camera 15 and the camera 16 are independently provided on the periphery of the pressure detecting unit and the nozzle 11.
It will be appreciated that in order to test the energy distribution of the fluidic structure, the thermal imager needs to be facing the fluidic platform, i.e. the position between the nozzle and the pressure sensing unit. The camera takes a picture of the jet pattern at the side of the jet platform (i.e. the location between the nozzle and the pressure detection unit).
The system for generating and testing the flow pattern of the high-pressure gas-liquid two-phase jet flow mainly comprises a two-phase jet flow pattern generating system, a flow pattern observing system and a flow pattern effect testing system, can not only explore the generation rules of different flow patterns of the high-pressure gas-liquid two-phase jet flow, but also test and test the jet flow structures and the jet flow effects of different flow patterns, has the characteristics of intuition and comprehensiveness for researching the jet flow structures of different jet flow patterns, and provides theoretical support for the application of different flow patterns in the future.
It should be noted that the camera is an image capturing device, and in order to obtain a better test effect, the camera is preferably a high-speed camera, and the shooting speed is set to 200 pfs and 600 pfs. It can be understood that the flow pattern observation tube can observe the gas-liquid two-phase jet flow pattern in the pipeline in real time, the camera can test the jet flow form at the nozzle, and the two flow patterns jointly form a flow pattern observation system.
Optionally, in order not to affect the flowing state of the jet flow in the pipeline and to truly reflect the flowing state in the pipeline, the flow pattern observation tube 9 is a high-pressure-resistant transparent tube, preferably a high-strength transparent tube, such as a tube made of a paml plate. As shown in fig. 2, both ends of the flow pattern observing pipe 9 are hermetically connected with a pipeline 21 between the blender 8 and the two-phase flow pressure transmitter 10 through a first flange 18 and a second flange 19; the first flange 18 and the second flange 19 are connected together by bolts 20, more specifically, the flange plates of the first flange 18 and the second flange 19 are uniformly provided with 6 bolt holes along the circumferential direction, the first flange 18 and the second flange 19 are connected together by 6 bolts inserted into the bolt holes, and the ends are fastened by nuts. Preferably, the first flange 18 and the second flange 19 each include a flange and a tubular connection portion for connecting the flow pattern observation pipe 9 to the pipe 21 between the blender 8 and the two-phase flow pressure transmitter 10, and the tubular connection portion is integrally formed on one side surface of the flange, and is provided with an external thread. When the flow type observation pipe is used, the tubular connecting part is inserted into the pipeline of the mixing unit, the flow type observation pipe is connected with the pipeline of the mixing unit, and the outer diameter of the tubular connecting part needs to be equal to the inner diameter of the pipeline of the mixing unit to ensure that fluid does not overflow.
Optionally, the liquid phase generating unit comprises a high-pressure water pump 1 for generating high-pressure water, a waterway pressure regulating valve 2 for monitoring pressure changes, an overflow valve 17 for regulating the water pressure of the pipeline, and a liquid flowmeter 3 for monitoring flow, which are sequentially communicated by a pipeline; the liquid flow meter 3 communicates with the blender 8. The high-pressure water pump is mainly used for pressurization, and for example, a sincerity JC3091 type high-pressure pump and the like can be selected. The liquid flow meter can be selected from turbine flow meter, electromagnetic flow meter, etc., but is preferably an electromagnetic flow meter.
Optionally, the gas phase generating unit includes an air compressor 4 for generating high-pressure air, a gas storage cylinder 5 for buffering and stabilizing pressure, a pressure reducing valve 6, a gas flow meter 7 for monitoring gas flow, and a one-way valve (not shown in the figure) which are sequentially communicated by a pipeline; the one-way valve is in communication with the blender 8. It can be understood that the gas cylinder receives the high pressure air from the air compressor, so the gas cylinder needs to be selected as the high pressure gas cylinder, and the high pressure gas cylinder should be provided with a pressure regulating valve and a pressure gauge for regulating the pressure of the gas cylinder. The gas flowmeter can be a V-cone flowmeter or a vortex flowmeter, but the vortex flowmeter has small pressure loss, large measuring range and high precision, and is hardly influenced by parameters such as fluid density, pressure, temperature, viscosity and the like when measuring the working condition volume flow, so the vortex flowmeter is preferably selected in the embodiment of the invention.
It will be appreciated that the blender is a vessel for mixing liquid and gas phases and that in embodiments of the invention, existing blenders for mixing liquid and gas phases may be used. However, as a preferred embodiment of the present invention, as shown in fig. 3, the blender 8 has the following structure: the blender 8 comprises a blending chamber 801, one end of the blending chamber 801 is provided with a water channel 802 and a gas channel 803, and the other end is provided with a gas-liquid two-phase outlet 804; the water channel 802, the gas channel 803, the mixing chamber 801 and the gas-liquid two-phase outlet 804 are communicated with each other. The water passage 802 communicates with the liquid phase generation unit, and the gas passage 803 communicates with the gas phase generation unit. In order to make the hitting force emitted from the nozzle larger and the loss smaller, both the water passage 802 and the air passage 803 are arranged in parallel. The shape of the mixing chamber 801 is circular truncated cone shape for saving raw material, but is not limited to circular truncated cone shape.
It should be noted that, in the liquid phase generating unit and the gas phase generating unit, the pressure gauge installed on the gas storage cylinder, the pressure regulating valve for regulating the pressure of the gas cylinder, and the gas flow meter for monitoring the flow rate constitute a gas regulation and monitoring system, and the regulating knob for regulating the water pressure of the water pump, the overflow valve for regulating the water pressure, the waterway pressure regulating valve for monitoring the pressure and the flow rate, and the liquid flow meter constitute a liquid regulation and monitoring system. The gas-liquid two-phase jet flow with different gas contents can be regulated by controlling the pressure regulating valve and the overflow valve, and further parameter conditions for generating different two-phase jet flow patterns are explored.
Optionally, the pressure detection unit includes a distributed film pressure sensor 12 and a gantry 13; the distributed film pressure sensor 12 is installed on the portal frame 13, and the upper surface of the distributed film pressure sensor 12 is opposite to the fluid outflow part of the nozzle 11. The distributed film pressure sensor can test the pressure distribution of the jet flow of different flow patterns on the whole jet flow surface to obtain a real-time image of the pressure distribution along with time, can monitor the pressure distribution of the jet flow surface relative to a single-point pressure sensor, and has the characteristics of intuition and comprehensiveness for researching jet flow structures of different jet flow patterns. As shown in fig. 1, the portal frame includes a first transverse plate and a second transverse plate that are parallel to each other, the first transverse plate is located above the second transverse plate, the first transverse plate and the second transverse plate are fixedly connected together through a vertical plate (for example, bolted connection), and the distributed film pressure sensor is tiled and fixed on the first transverse plate and can be fixed through bolts. When the device is used, the portal frame can freely move up and down, left and right, and the distance between the nozzle and the distributed film pressure sensor is adjusted, so that the jet flow structural characteristics of the same flow pattern and different target distances can be obtained.
Optionally, in order to conveniently obtain a real-time image according to the pressure distribution measured by the distributed film pressure sensor, the embodiment of the present invention further includes a computer acquisition device 14, and when in use, the computer acquisition device 14 is electrically connected (for example, electrically connected by a cable) with the distributed film pressure sensor 12. The computer acquisition device is a computer.
The method for generating the high-pressure gas-liquid two-phase jet flow pattern and testing the effect by using the system (namely the use method of the system) comprises the following steps:
s1, adjusting the gas phase generating unit and the liquid phase generating unit to enable the gas phase pressure and flow and the liquid phase pressure and flow entering the blender 8 to reach the set values of the experimental scheme;
s2, recording pressure and flow data, observing the flow pattern of the two-phase jet flow in the mixed flow pattern observation pipe 9, shooting a jet flow form image, and simultaneously recording the distribution pressure data of the jet flow sprayed out from the nozzle 11 through the distributed film pressure sensor 12 for subsequent analysis;
s3, continuously adjusting the doping amount and pressure of the gas, shooting the change condition of the flow pattern at the nozzle by the camera 16, and corresponding jet form images and jet pressure data;
and S4, recording the corresponding parameters of the shot gas-liquid two-phase flow pattern and the corresponding gas and liquid, and classifying and contrasting the recorded parameters with the image data obtained by the distributed film pressure sensor 12 to obtain conditions generated by different flow patterns and corresponding jet flow effects.
Optionally, before step S1, the gas-liquid two-phase jet flow pattern generating system and the flow pattern effect testing system need to be connected completely, and the gas flowmeter 7, the liquid flowmeter 3, the waterway pressure transmitter 2, the two-phase flow pressure transmitter 10, the distributed film pressure sensor 12, the camera 16, the thermal imager 15, and the computer (i.e., the computer) are powered on and started.
Optionally, before step S1, the gantry is adjusted to determine the relative position between the nozzle and the distributed film pressure sensor 12, so as to facilitate the subsequent jet impact experiment.
Optionally, in step S1, the method for adjusting the gas phase generation unit includes: and (3) closing the valve of the gas storage steel cylinder, opening the air compressor, stopping the main engine of the air compressor when the rated pressure is reached, and operating the auxiliary engine. And opening a pressure regulating valve on the gas storage steel cylinder, regulating the pressure reducing valve to change the pressure value, and observing the pressure gauge and the gas flowmeter until reaching the set value of the experimental scheme.
Optionally, in step S1, the method for adjusting the liquid phase generation unit includes: and starting the high-pressure water pump, and adjusting the water pressure of the pipeline by adjusting the overflow valve after the high-pressure water pump runs stably so as to reach the pressure required by the experiment.
Optionally, in step S2, the flow pattern of the two-phase jet flow in the post-blending flow pattern observation pipe 9 is observed and a jet flow pattern image is captured, and this operation may be captured by a mobile phone or a tablet computer with a camera, or by a camera such as the one in the embodiment of the present invention, and only one additional camera needs to be prepared.
Optionally, the method for generating the high-pressure gas-liquid two-phase jet flow pattern and testing the effect further includes, after the experiment is finished, closing the air compressor 4 and the high-pressure water pump 1, and detaching the film sensor to dry the film sensor for the next use.
The method for generating the high-pressure gas-liquid two-phase jet flow pattern and testing the effect of the embodiment of the invention is described by a specific test example, the utilized system is shown in figure 1, a gas flowmeter adopts a vortex flowmeter, and a liquid flowmeter adopts an electromagnetic flowmeter; the camera adopts a high-speed camera, and the shooting speed is set to be 500 pfs; the gas storage steel cylinder adopts a high-pressure gas storage steel cylinder. The flow pattern observation tube 9 is a transparent tube made of a paml plate and has a length of 1.5 cm.
The method for generating and testing the effect of the high-pressure gas-liquid two-phase jet flow pattern comprises the following steps of:
a. after the two-phase jet flow pattern generation system and the flow pattern effect test system are connected, the matched electromagnetic flowmeter, vortex shedding flowmeter 7, waterway pressure transmitter 2, mixed pressure transmitter 10, distributed film pressure sensor 12, camera 16, thermal imager 15 and computer are electrified and started.
b. By adjusting the portal frame 13, the relative position of the nozzle 11 and the distributed film pressure sensor 12 is fixed, the target distance is adjusted, and the subsequent jet impact is facilitated.
c. And closing the pressure regulating valve of the gas storage steel cylinder 5, starting the air compressor 4, and stopping the air compressor 4 when the compressed air in the gas storage steel cylinder 5 reaches the rated pressure of 25 MPa.
d. The high-pressure water pump 1 is started, the overflow valve 17 is adjusted to enable the water path pressure to reach 5MPa, and the flow of the high-pressure water pump is recorded to be 1.4m through the electromagnetic flowmeter3H; then, the pressure regulating valve of the gas storage steel cylinder 5 is opened, the pressure reducing valve is regulated, the pressure is gradually increased to ensure that the gas can be just mixed into the water, and the gas pressure is 3MPa at the moment. After a period of stabilization, the gas pressure at this time was recorded as 3MPa and the flow as 4m3And h, simultaneously shooting the bubbles and the flow pattern in the flow pattern observation tube 9 by adopting a tablet personal computer with a camera, and simultaneously acquiring data of the distributed thin film sensor 12, wherein the data acquisition time lasts for 30s, and the specific data is shown in fig. 4.
e. The water pressure of the fixed water channel is 5MPa, the doping amount of gas is increased by increasing the outlet air pressure of the pressure regulating valve, the change condition of the flow pattern is observed through the camera 16, the thermal imaging instrument 15 captures the change of the energy around the nozzle, and the pressure distribution data under the flow pattern is recorded through the distributed film pressure sensor 12.
f. Setting the pressure increase range of the gas to be 0.5MPa and the highest pressure to be 5.5MPa, respectively recording the flow pattern and the pressure distribution characteristics of gas-liquid two-phase jet flow under different pressure gradients, and analyzing to find out the rule. It was found that at 5.5MPa, almost all of the gas was ejected from the nozzle 11, and the amount of water was small.
g. After the experiment is finished, the air compressor 4 and the high-pressure water pump 1 are closed, and the distributed film pressure sensor 12 is detached and dried for the next use.
h. The photographed gas-liquid two-phase flow pattern and the corresponding parameters of the corresponding gas and liquid are recorded and classified and compared with the image data obtained by the distributed film pressure sensor 12, so that conditions generated by different flow patterns and corresponding jet flow effects are obtained.
As shown in FIG. 4, the Fuprison distributed thin film pressure sensor analysis software can monitor the weight (kg), force (N) and sampling area (mm) of gas-liquid two-phase jet flow2) The sample pressure (kpa) versus time, i.e., the number of frames.
Along with the change of the acquisition time, namely the increase of the frame number, the overall force is fluctuated, which shows that the hitting force of the gas-liquid two-phase jet flow is continuously changed along with the time. The integral sampling area also shows fluctuation change, which shows that the size of the impact surface of the gas-liquid two-phase jet flow is also changed continuously, and when the impact surface is enlarged, the gas is doped in a large amount, so that the impact area is larger than that of pure water. After the data of force and area are collected, the whole striking pressure can be calculated accordingly, for example, the last column of data in the graph shows that the sampled whole pressure is in fluctuation change, the graph can reflect the data conditions of the whole sampling area, pressure and the like, and if the data of specific positions are known, the data can be observed through the graph 5.
The pressure intensity and relative height of each position of the striking face at a certain moment can be intuitively and visually reflected through the graph 4 and the graph 5, and the distribution condition of the whole striking face can be intuitively known.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A system for generating and testing an effect of a high-pressure gas-liquid two-phase jet flow pattern is characterized by comprising: the device comprises a two-phase jet flow type generating system, a flow type observing system and a flow type effect testing system;
the two-phase jet flow pattern generating system comprises a liquid phase generating unit, a gas phase generating unit and a blender (8), wherein the liquid phase generating unit and the gas phase generating unit are both communicated with the blender (8), and the blender (8) is sequentially communicated with a two-phase flow pressure transmitter (10) and a nozzle (11) through a pipeline;
the flow pattern observation system comprises a flow pattern observation tube (9) and a camera (16); the flow pattern observation pipe (16) is arranged on a pipeline between the blender (8) and the two-phase flow pressure transmitter (10);
the flow pattern effect testing system comprises a pressure detection unit and a thermal imager (15); the pressure detection unit is positioned below the nozzle (11), and the position of the pressure detection unit relative to the nozzle (1) is adjustable; the thermal imaging camera (15) and the camera (16) are independently arranged on the periphery of the pressure detection unit and the nozzle (11).
2. The system for generating and testing the effect of the high-pressure gas-liquid two-phase jet flow pattern according to claim 1, wherein the liquid phase generating unit comprises a high-pressure water pump (1), a waterway pressure regulating valve (2), an overflow valve (17) and a liquid flowmeter (3) which are sequentially communicated by a pipeline; the liquid flow meter (3) is communicated with the blender (8).
3. The system for generating and testing the effect of the high-pressure gas-liquid two-phase jet flow pattern according to claim 1, wherein the gas phase generating unit comprises an air compressor (4), a gas storage steel cylinder (5), a pressure reducing valve (6), a gas flowmeter (7) and a one-way valve which are sequentially communicated by a pipeline; the one-way valve is communicated with the blender (8).
4. The system for generating and testing the effect of the high-pressure gas-liquid two-phase jet flow pattern according to any one of claims 1 to 3, wherein the blender (8) comprises a blending chamber (801), one end of the blending chamber (801) is provided with a water channel (802) and an air channel (803), and the other end of the blending chamber is provided with a gas-liquid two-phase outlet (804); the water channel (802) is communicated with the liquid phase generation unit, and the gas channel (803) is communicated with the gas phase generation unit.
5. The system for generating and testing the effect of a high-pressure gas-liquid two-phase jet flow pattern according to claim 4, wherein the water channel (802) and the air channel (803) are arranged in parallel.
6. The system for generating and testing the effect of the high-pressure gas-liquid two-phase jet flow pattern according to claim 1, wherein the flow pattern observation pipe (9) is a transparent pipe, and two ends of the flow pattern observation pipe are hermetically connected with a pipeline (21) between the blender (8) and the two-phase flow pressure transmitter (10) through a first flange (18) and a second flange (19); the first flange (18) and the second flange (19) are connected together by bolts (20).
7. The system for generating and testing the effect of the high-pressure gas-liquid two-phase jet flow pattern according to claim 6, wherein the first flange (18) and the second flange (19) each comprise a flange plate and a tubular connecting portion for connecting the flow pattern observation pipe (9) to the pipeline (21) between the mixer (8) and the two-phase flow pressure transmitter (10), and the tubular connecting portion is integrally formed on one side surface of the flange plate and is provided with external threads.
8. The system for generating and testing the effect of the high-pressure gas-liquid two-phase jet flow pattern according to claim 1, wherein the pressure detection unit comprises a distributed film pressure sensor (12) and a portal frame (13); the distributed film pressure sensor (12) is installed on the portal frame (13), and the upper surface of the distributed film pressure sensor (12) is over against the fluid outflow part of the nozzle (11).
9. The system for generating and testing the effect of the high-pressure gas-liquid two-phase jet flow pattern according to claim 1, further comprising a computer acquisition device (14); the computer acquisition device (14) is electrically connected with the distributed film pressure sensor (12).
10. A method for generating and testing the effect of a high-pressure gas-liquid two-phase jet flow pattern by using the system as claimed in any one of claims 1 to 9, which comprises the following steps:
s1, adjusting the gas phase generating unit and the liquid phase generating unit to enable the gas phase pressure and flow and the liquid phase pressure and flow entering the blender (8) to reach the set values of the experimental scheme;
s2, recording pressure and flow data, observing the flow pattern of two-phase jet flow in the mixed flow pattern observation pipe (9), shooting a jet flow form image, and recording the distribution pressure data of the jet flow sprayed out from the nozzle (11) through the distributed film pressure sensor (12) for subsequent analysis;
s3, continuously adjusting the doping amount and pressure of the gas, shooting the change condition of the flow pattern at the nozzle by a camera (16), and corresponding jet form images and jet pressure data;
and S4, recording the corresponding parameters of the shot gas-liquid two-phase flow pattern and the corresponding gas and liquid, and classifying and contrasting the recorded parameters with the image data obtained by the distributed film pressure sensor (12) to obtain conditions generated by different flow patterns and corresponding jet flow effects.
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| CN115012925A (en) * | 2022-08-08 | 2022-09-06 | 西南石油大学 | Experimental determination method for vertical gas well shaft flow pattern under high pressure condition |
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