CN113503291B - Flow regulator for measuring flow field behind bent pipe - Google Patents
Flow regulator for measuring flow field behind bent pipe Download PDFInfo
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- CN113503291B CN113503291B CN202110645646.5A CN202110645646A CN113503291B CN 113503291 B CN113503291 B CN 113503291B CN 202110645646 A CN202110645646 A CN 202110645646A CN 113503291 B CN113503291 B CN 113503291B
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- pipe
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- passageway
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/001—Flow of fluid from conduits such as pipes, sleeves, tubes, with equal distribution of fluid flow over the evacuation surface
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/02—Influencing flow of fluids in pipes or conduits
Abstract
The invention discloses a flow regulator for measuring a flow field after bending a pipe, which comprises radial blades, a pipeline and a central pipe, wherein the central pipe and the pipeline are coaxially arranged; the central tube is a closed structure of a through hole; the spacing angle of the radial blades positioned on the inner arc of the bent pipe is smaller than that of the radial blades positioned on the outer arc of the bent pipe; the flow regulator provided by the invention adopts an asymmetric structure of the inner side and the outer side of the bent pipe, and the flow state of the inner side is mainly regulated, so that the vortex in the flow is reduced, and a more uniform flow field after the bent pipe is realized; under the condition of lower pressure loss, the vortex and flow field speed distortion generated by liquid flowing after the elbow pipe is eliminated to the maximum extent, and the method has important significance for improving the accuracy and stability of the measurement result of the measuring instrument.
Description
Technical Field
The invention belongs to the technical field of flow measuring devices, and particularly relates to a flow regulator for measuring a flow field behind a bent pipe.
Background
Fluid machines such as compressors, water pumps, ventilators and the like play an important role in the key industry fields such as metallurgy, petrochemical industry, water conservancy and the like. According to statistics, the fluid machinery consumes more than 30% of the total national electric energy every year, so the running efficiency, reliability and economy of the system directly influence the economic and social development of China. In order to enable the whole system to be more efficient and energy-saving, the fluid mechanical equipment needs to provide matched parameters such as flow and pressure according to the parameters required by the system in the operation process of the system, so that accurate measurement is carried out on the whole system to obtain more accurate performance parameters in the factory test and actual field operation of the equipment, and the method has important significance for energy conservation, emission reduction and process control. The stringency of the measurement system directly has an important influence on the correctness and rationality of the results. The flowmeter and the pressure measuring instrument are used as important sensing equipment for energy metering and industrial system control, and the accuracy and the reliability of the measuring result are directly related to the safety and the reliability of the testing result.
Commonly used flow meters include differential pressure flow meters, electromagnetic flow meters, coriolis mass flow meters, and the like, and pressure is mainly measured by providing pressure measurement holes in the pipe wall at the measurement section. The accuracy and reliability of flow and pressure measurement are directly related to the flowing state of fluid in the pipeline, the cross section needs to have the requirements of axisymmetric speed distribution, isostatic pressure distribution, no vortex caused by a device and the like, a longer straight pipe section cannot be arranged to eliminate flow field distortion due to site limitation in an actual test system and an actual field pipeline system, pipe fittings such as a bent pipe cannot be avoided, and the fluid flows through the bent pipe to cause the generation of the non-constant flow phenomena such as larger speed distribution distortion, rotational flow and the like in the pipeline, so that the accuracy and reliability of the measurement result of the flowmeter and the pressure tapping hole are influenced. Flow regime distortion generated and extending from the upstream bend of the measuring device is therefore reduced or eliminated by installing a flow conditioner upstream of the measuring device.
International standard ISO5167 recommends several flow regulators with better regulation effect on straight pipe sections, including a pipe bundle type, a perforated plate type and a square grid type, but because the flow states of the inner side and the outer side of the elbow are different, the flow distortion of the flow field is more serious because the inner side of the elbow generates stronger secondary flow, pulsating flow and speed distortion in the cross section under the action of centrifugal force, so that the regulation effect of the existing flow regulator on the flow state of fluid after the elbow is not as good as that of the straight pipe, and further development on the prior art is needed.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a flow regulator for measuring a flow field after bending a pipe, which has the advantages of simple structure, strong universality, simple processing and manufacturing, small pressure loss and the like, and can overcome the problem that the precision, the accuracy and the reliability of a measuring instrument are reduced due to flow state distortion generated after bending the pipe in a pipeline.
In order to achieve the purpose, the invention adopts the technical scheme that: a flow regulator for measuring a flow field after bending a pipe comprises radial blades, a pipeline and a central pipe, wherein the central pipe and the pipeline are coaxially arranged, the radial blades are arranged along the circumference of the pipeline and the central pipe in an array mode, the radial blades divide the space between the pipeline and the central pipe into a plurality of channels, and the length direction of each channel is along the axial direction of the pipeline; the central tube is a closed structure of a through hole; the spacing angle of the radial blades positioned on the inner arc of the bent pipe is smaller than that of the radial blades positioned on the outer arc of the bent pipe.
The channel includes A district's passageway, B district's passageway and C district's passageway, and the interval angle between the radial blade of A district's passageway is greater than the interval angle between the radial blade of B district's passageway, and the interval angle between the radial blade of B district's passageway is greater than the interval angle between the radial blade of C district's passageway, and A district's passageway and B district's passageway are installed in the crooked outer arc direction of return bend, and C district's passageway is installed in the crooked inner arc direction of return bend.
The sector of the channel in zone a is set at 60 °, each blade is separated by an angle of 30 °, the channel in zone B is located on both sides of the channel in zone a, the sector of the channel in zone B on one side is set at 60 °, each blade is separated by an angle of 20 °, the sector of the channel in zone C is set at 180 °, and each blade is separated by an angle of 15 °.
A plurality of radial separating pipes are coaxially arranged between the central pipe and the pipeline, and the separating pipes and the radial blades separate the pipeline into a plurality of channels.
The radial separating pipes are uniformly arranged along the radius of the pipeline, and the axial length of the radial separating pipes is the same as that of the radial blades at the radius of the radial separating pipes.
The radial blades, the central pipe, the pipeline and the radial separating pipe are integrally extruded and molded, or the radial blades, the central pipe and the pipeline are molded in a welding mode, and the radial blades and the radial separating pipe are molded in a welding mode.
The axial length of the pipeline is greater than the axial longest length of the radial vane, and the axial longest length of the radial vane is not less than 80% of the pipeline length.
The end facing the medium is in a horn shape, the inlet end of each radial blade is a circular arc-shaped straight blade, the axial length of each radial blade at the inlet end is reduced along with the reduction of the diameter, the axial length of each radial blade at the inner wall of the pipeline is the longest, and the axial length of each radial blade at the central pipe is the shortest.
The axial longest length of the radial vanes is more than twice the diameter of the pipe, and the diameter of the central pipe is 0.15 times the diameter of the pipe.
Flanges are arranged at two ends of the pipeline.
Compared with the prior art, the invention has at least the following beneficial effects:
because the flow states of the inner side and the outer side of the elbow are different, the inner side of the elbow generates stronger secondary flow in a cross section due to the action of centrifugal force, and the flow distortion is more serious than the outer side, the radial blade provided by the invention divides the cross section of a pipeline into three non-uniform channels with different interval angles, the inner side and the outer side of the elbow are respectively provided with a channel with small interval and a channel with larger interval, and the flow state of the inner side of the elbow is mainly adjusted by arranging the more dense radial blade on the inner side of the elbow, so that large-scale eddy current in the flow is reduced, the pulsation of a flow field is reduced, and the precision, the accuracy and the reliability of a measuring instrument are improved;
furthermore, the radial separating pipe provided by the invention divides the cross section of the pipeline into a plurality of annular channels, further encrypts the fan-shaped channels divided by the radial blades, further enhances the capability of eliminating secondary flow vortexes and velocity nonuniformity in the flow, has reasonable structural design, low processing and manufacturing cost and convenient installation, adopts an asymmetric structure at the inner side and the outer side of the bent pipe, and eliminates the vortexes and flow field velocity distortion generated by the inner side fluid flow after the bent pipe to the maximum extent under the condition of generating lower pressure loss, so that the flow field can be rectified into a uniform and symmetric flow field, and the accuracy and stability of the measuring result of the measuring instrument are improved.
Furthermore, according to the flow characteristics that the flow velocity of the flowing medium is larger at the center of the pipeline and the flow velocity is reduced along the radial direction, the radial blade is arranged into a shape that the axial length is reduced along the reduction of the diameter, namely the front end of the blade is arc-shaped, the flow velocity attack angle at the boundary layer is increased, meanwhile, the attack angle at the position with higher intermediate flow velocity is reduced, the impact loss of the fluid flow process on the radial blade is greatly reduced, the resistance of the whole flow regulator is reduced, and the effect is optimal.
Furthermore, the radial grids, the central pipe and the radial blades are integrally formed, so that the rectifier not only plays a role in rectification, but also supports the rectifier body and increases the strength of the flow regulator, so that the internal structure of the whole rectifier is more stable, and the rectifier can be suitable for systems with larger pipe diameters and larger flow velocities.
Drawings
Other features, objects, and advantages of the invention will become apparent from the following further description of the invention when taken in conjunction with the accompanying drawings and examples in which:
fig. 1 is a schematic perspective view of an embodiment of the present invention.
Fig. 2 is a perspective view of the inner vane and the radial partition pipe of the pipe according to the embodiment of the present invention.
Fig. 3 is a schematic cross-sectional view in the radial direction of an embodiment provided by the present invention.
Fig. 4 is a schematic cross-sectional view of an embodiment of the present invention taken along the axial direction.
FIG. 5 is a radial blade provided by the present invention.
Fig. 6 is a three-dimensional schematic view of a bent tube.
FIG. 7 is a pressure contour plot at the rear cross section of the elbow.
Description of reference numerals: 1-radial blade, 2-pipeline, 3-radial separating pipe, 4-central pipe and 5-flange.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
The flow regulator for measuring the flow field after the bent pipe is suitable for eliminating the speed distribution distortion of the inner side after the bent pipe and the flow field distortion influence of the secondary vortex, and comprises a radial blade 1, a radial separating pipe 3 and a central pipe 4 which are shown in figure 1, wherein the three internal components are arranged in a pipeline 2 shown in figure 1 to jointly form the complete flow regulator. The two ends of the flow adjuster are provided with flanges 5 with screw holes, the flow adjuster is placed between the two sections of pipelines, and the flow adjuster is axially fixed along the pipelines through a plurality of bolts. During use, the flow regulator is arranged behind the pipe elbow and in front of the measuring instrument and has a certain distance with the measuring instrument.
Referring to fig. 1 and 2, a flow regulator for post-elbow flow field measurement comprises radial blades 1, a pipe 2 and a central pipe 4, wherein the central pipe 4 and the pipe 2 are coaxially arranged, the radial blades 1 are arranged in an array along the circumferences of the pipe 2 and the central pipe 4, the radial blades 1 divide the space between the pipe 2 and the central pipe 4 into a plurality of channels, and the length direction of the channels is along the axial direction of the pipe; the central tube 4 is a closed structure of a through hole; the spacing angle of the radial vanes 1 positioned on the inner arc of the elbow is smaller than that of the radial vanes 1 positioned on the outer arc of the elbow.
The passageway includes A district's passageway, B district's passageway and C district's passageway, and the interval angle between the radial blade 1 of A district's passageway is greater than the interval angle between the radial blade 1 of B district's passageway, and the interval angle between the radial blade 1 of B district's passageway is greater than the interval angle between the radial blade 1 of C district's passageway, and A district's passageway and B district's passageway are installed in the crooked outer arc department of return bend, and C district's passageway is installed in the crooked inner arc department of return bend.
As can be seen inside the flow conditioner shown in fig. 2, the radial blades have a certain length in the axial direction of the barrel; the radial vanes are distributed in a circumferential array around the central axis of the pipeline and divide the cross section of the pipeline into a plurality of channels; the radial blades divide a channel of the cross section of the pipeline into an area A, an area B and an area C, the interval angles among the radial blades in the area A, the area B and the area C are sequentially reduced, namely the number of the radial blades in the area A is the minimum, the number of the radial blades in the area C is the maximum, the area A and the area B are arranged in the outer side direction of the bent pipe after bending, and the area C is arranged in the inner side direction of the bent pipe after bending. The C area is positioned on the inner side of the elbow, more dense radial blades are arranged, the flow state of the inner side is adjusted in a stronger mode, secondary flow movement and pulsation of large-scale vortex in the flow are blocked, and the inner fluid moves in the axial direction in a forced mode.
The ratio of the angles of the area A, the area B and the area C to the total cross-sectional area of the pipeline should be increased in sequence, and when the diameter of the pipeline is increased, the number of radial blades and the number of radial separating pipes of the flow regulator should be increased, so that the flow regulation capacity is enhanced.
As shown in fig. 5, the front end of the radial vane 5 is a circular arc-shaped straight vane with equal thickness, the circular arc of the front end is perpendicular to the inner wall of the pipeline 2 and tangent to the central pipe 4, that is, the radial vane is arranged in a shape that the axial length is reduced along with the reduction of the radius, and the axial length of the radial vane 1 at the inner wall of the pipeline 4 is the longest and the axial length of the radial vane 1 at the central pipe 4 is the shortest, which is a structural characteristic that can be easily seen in fig. 5 and 2.
Referring to fig. 2, the dividing pipes are uniformly arranged along the radius of the pipeline, the section of the whole pipeline is divided into a plurality of annular channels, the dividing pipes and the radial blades 1 are vertically connected in a staggered manner, and the axial lengths of the radial dividing pipes and the axial lengths of the radial blades corresponding to different radii are the same.
As shown in fig. 1 and 4, the central tube 4 is a closed structure of a through hole, and the central tube 4 is arranged coaxially with the pipeline; d pipe Is the diameter of the pipe 2.
The axial length of the pipeline 2 is larger than the axial longest length of the radial vane 1, and the axial longest length of the radial vane 1 is not less than 80% of the length of the pipeline 2.
As shown in fig. 1, which is a schematic structural view of a preferred embodiment of the present invention, the flow conditioner according to the present invention includes radial blades 1 having a thickness set in an axial direction, as seen from a left side view in fig. 3, the entire passage is divided into a passage a, a passage B, and a passage C, and a sector area of the passage a is set to 60 °, each blade is spaced apart at an angle of 30 °, the passage B is located at both sides of the passage a, a sector area of the passage B on one side is set to 60 °, each blade is spaced apart at an angle of 20 °, a sector area of the passage C is set to 180 °, and each blade is spaced apart at an angle of 15 °. The radial blades 1 in this embodiment have a duct-side axial length of 2 times the diameter of the duct 2.
The radial separating tubes 3 are uniformly arranged along the radius of the pipeline, as shown in fig. 3, in the embodiment, the diameters of the two inner radial separating tubes 3 are respectively one third and two thirds of the diameter of the pipeline, the section of the pipeline is divided into 3 annular channels for separating the vortex flow at the position and enhancing the rectification capacity of the flow regulator; the diameter of the central tube 4 in this example is 0.15 times the diameter of the tube 2.
Referring to fig. 6, a three-dimensional schematic diagram of the elbow is shown, a flow regulator is arranged at the downstream of the elbow, and after the fluid medium passes through the elbow, the flow regulator adjusts the flow velocity and pressure distribution of the flow field, and then the fluid medium flows through a measuring instrument to measure the pressure and flow.
After passing through the flow regulator, the pressure and speed distribution condition of the fluid in the cross section of the pipeline can be regulated, so that the flow field distribution is more uniform.
The computational fluid dynamics numerical simulation calculation is performed on the elbow system shown in fig. 6, the flow field information after the elbow is intercepted, and reference is made to fig. 7 which is a pressure contour map at the rear cross section of the elbow when no fluid regulator is arranged.
The above embodiments are provided only for illustrating the specific features of the present invention, and not for limiting the present invention, and changes may be made by appropriately adding or subtracting, so that all equivalent technical solutions should also fall within the scope of the present invention and should be defined by the claims.
Claims (9)
1. A flow regulator for measuring a flow field after bending a pipe is characterized by comprising radial blades (1), a pipeline (2) and a central pipe (4), wherein the central pipe (4) and the pipeline (2) are coaxially arranged, the radial blades (1) are arranged in an array along the circumferences of the pipeline (2) and the central pipe (4), the radial blades (1) divide a space between the pipeline (2) and the central pipe (4) into a plurality of channels, and the length direction of each channel is along the axial direction of the pipeline; the central tube (4) is a closed structure of a through hole; the spacing angle of the radial blades (1) positioned on the inner arc of the bent pipe is smaller than that of the radial blades (1) positioned on the outer arc of the bent pipe; the passageway includes A district's passageway, B district's passageway and C district's passageway, and the interval angle between the radial blade (1) of A district's passageway is greater than the interval angle between the radial blade (1) of B district's passageway, and the interval angle between the radial blade (1) of B district passageway is greater than the interval angle between the radial blade (1) of C district passageway, and A district's passageway and B district's passageway are installed in the crooked outer arc direction of return bend, and C district's passageway is installed in the crooked inner arc direction of return bend.
2. The flow conditioner for post-elbow flow field measurement according to claim 1, wherein the sectored area of the channels in area a is set at 60 °, each blade is separated by an angle of 30 °, the channels in area B are located on both sides of the channels in area a, the sectored area of the channels in area B on one side is set at 60 °, each blade is separated by an angle of 20 °, the sectored area of the channels in area C is set at 180 °, and each blade is separated by an angle of 15 °.
3. Flow conditioner for post-elbow flow field measurement according to claim 1, characterized in that a plurality of radial separation tubes (3) are coaxially arranged between the central tube (4) and the pipe (2), said radial separation tubes (3) and radial vanes dividing the pipe into a plurality of channels.
4. Flow conditioner for elbow post flow field measurement according to claim 3, characterized in that radial separator tubes (3) are evenly arranged along the radius of the pipe, radial separator tubes (3) being the same axial length as the radial vanes (1) at the radius where they are located.
5. The flow regulator for flow field measurement after pipe bending according to claim 3, characterized in that the radial blade (1) is integrally extruded with the central pipe (4), the pipe (2) and the radial separation pipe (3), or the radial blade (1) is formed by welding with the central pipe (4) and the pipe (2), and the radial blade (1) is formed by welding with the radial separation pipe (3).
6. The flow conditioner for post-elbow flow field measurement according to claim 1, characterized in that the axial length of the conduit (2) is greater than the axial longest length of the radial blade (1), the axial longest length of the radial blade (1) being not less than 80% of the length of the conduit (2).
7. The flow conditioner for flow field measurement after pipe bending according to claim 1, characterized in that the end facing the media is trumpet shaped, the radial blade (1) is a straight blade with circular arc shape at the inlet end, the axial length of the radial blade (1) at the inlet end is reduced along with the reduction of the diameter, and the axial length of the radial blade (1) at the inner wall of the pipe (2) is the longest, and the axial length of the radial blade (1) at the central pipe (4) is the shortest.
8. Flow conditioner for post-elbow flow field measurement according to claim 1, characterized in that the axially longest length of the radial vanes (1) is more than twice the diameter of the pipe and the diameter of the central tube (4) is 0.15 times the diameter of the pipe (2).
9. Flow conditioner for post-elbow flow field measurement according to claim 1, characterized in that flanges are provided at both ends of the pipe (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110645646.5A CN113503291B (en) | 2021-06-09 | 2021-06-09 | Flow regulator for measuring flow field behind bent pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110645646.5A CN113503291B (en) | 2021-06-09 | 2021-06-09 | Flow regulator for measuring flow field behind bent pipe |
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| CN113503291A CN113503291A (en) | 2021-10-15 |
| CN113503291B true CN113503291B (en) | 2022-08-05 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2583642Y (en) * | 2002-12-06 | 2003-10-29 | 上海航天动力机械有限公司 | Flow regulating apparatus for gas flow measuring probe unit |
| CN102200141A (en) * | 2011-06-02 | 2011-09-28 | 温州市天成密封件制造有限公司 | Energy-saving guide vane device for pump |
| CN109386650A (en) * | 2018-10-18 | 2019-02-26 | 哈尔滨工业大学 | A kind of valve noise optimization method |
| CN112343866A (en) * | 2020-11-03 | 2021-02-09 | 中国北方发动机研究所(天津) | Pipeline airflow rectifier |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MX2009012360A (en) * | 2007-05-18 | 2009-12-16 | Mccrometer Inc | Flow straightening apparatus. |
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2021
- 2021-06-09 CN CN202110645646.5A patent/CN113503291B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2583642Y (en) * | 2002-12-06 | 2003-10-29 | 上海航天动力机械有限公司 | Flow regulating apparatus for gas flow measuring probe unit |
| CN102200141A (en) * | 2011-06-02 | 2011-09-28 | 温州市天成密封件制造有限公司 | Energy-saving guide vane device for pump |
| CN109386650A (en) * | 2018-10-18 | 2019-02-26 | 哈尔滨工业大学 | A kind of valve noise optimization method |
| CN112343866A (en) * | 2020-11-03 | 2021-02-09 | 中国北方发动机研究所(天津) | Pipeline airflow rectifier |
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