Device for improving flow uniformity of right-angle bent pipeline

Abstract

The invention discloses a device for improving the flow uniformity of a right-angle bent pipeline, which comprises a swirler, a connecting pipeline and a honeycomb rectifier, and is characterized in that the swirler and the honeycomb rectifier are respectively arranged at two ends of the connecting pipeline and are welded together, the swirler consists of a swirler outer pipe, blades and a hollow area, the blades adopt a naca6412 blade type, and the hollow area is arranged in the swirler outer pipe. The axial size proportion range of the top and the bottom of each blade is 1: 1-1: 2, the two ends of the cyclone outer pipe are open, the blades surround the cyclone outer pipe in the axial direction at equal intervals, the outer sides of the blades are fixedly connected with an inner pipeline of the cyclone outer pipe, the inner sides of the blades face the axis, and the length of the blades is smaller than the radius of the vertical section of the cyclone outer pipe. The multiple blades surround the axis of the cyclone outer pipe to form a hollow area. The honeycomb device is composed of a honeycomb device outer pipe and regular hexagon through holes, and the regular hexagon through holes are combined, embedded and welded to the honeycomb device outer pipe. According to the invention, the flow tends to be uniform in advance, the measurement precision is improved, and the required pipeline length is reduced.

Description

Technical Field

[0001] The present invention relates to a device for improving the flow uniformity of a pipeline, and in particular to a device for improving the flow uniformity of a right-angle bent pipeline, belonging to the technical field of fluid machinery. Background Art

[0002] In the fields of petroleum, chemical industry, energy and other industries, elbows, as a common pipeline element, occupy an important position in the transportation system. The fluid will show a rich flow phenomenon at the elbow, and the fluid will be forced to change the direction of the flow velocity when flowing through the elbow. The radius of curvature of the elbow is small. Due to the effect of inertial centrifugal force, the pressure on the outer wall increases and the pressure on the inner wall decreases. In this way, a diffusion effect is produced near the outer wall, and a convergence effect is produced on the inner wall. The water flow is separated on one side of the inner wall, forming a vortex area, which reduces the effective cross-section of the mainstream. Under the action of the boundary layer, secondary flow will also be generated at the elbow, which will superimpose with the mainstream to produce a vortex flow, and will disappear very slowly over a long distance in the long straight pipe section. This flow characteristic caused by flowing through the elbow makes the fluid flow in the long straight pipe section no longer uniform, and the various parameters that determine the flow rate are all non-uniformly distributed. If you want to obtain more accurate parameters in the experiment, move the measurement point backward, and at the same time increase the length of the pipeline, thereby increasing the production cost of the pipeline.

[0003] This unevenness will not only reduce the stability of the working fluid flow in the pipeline transportation system, but may also greatly reduce the safety of the pipeline transportation system. The reduced stability of the working fluid flow will reduce the life of the pipeline system to a certain extent, because the generation of flow unevenness will inevitably produce vortices, eddies and other structures, causing vibrations inside the pipeline and changes in pressure. This may cause the pipeline to be blocked or directly damaged, so the maintenance cost of the pipeline system with a bend structure is often higher.

[0004] At present, the commonly used rectification and resistance reduction methods for improving the flow uniformity of right-angle bend pipelines mainly include adding guide vanes, rectifier resistance reduction, changing the camber of the pipeline, etc. However, the method of directly adding a cyclone has not been implemented. Summary of the invention

[0005] The purpose of the present invention is to provide a device for improving the flow uniformity of a right-angle bend pipeline in view of the deficiencies in the prior art, to improve the flow uniformity of a right-angle bend pipeline and to improve the test accuracy. Without changing the shape of the pipeline too much, the present invention can more conveniently reduce the flow unevenness caused by the existence of centrifugal force by adding a specific device, thereby improving the flow stability and the accuracy of the measurement data.

[0006] The technical solution of the present invention is achieved in this way:

[0007] A device for improving the flow uniformity of a right-angled pipe comprises a cyclone, a connecting pipe and a honeycomb rectifier, wherein the cyclone and the honeycomb rectifier are respectively arranged at both ends of the connecting pipe and welded together, and the length ratio of the cyclone, the connecting pipe and the honeycomb rectifier is in the range of 1:2:2-1:10:3; the cyclone is composed of a cyclone outer tube, blades and a hollow area, the blades adopt a naca6412 blade type, the number ranges from 4 to 8, the angle between the blades ranges from 45° to 60°, the axial size ratio between the top and bottom of the blades ranges from 1:1 to 1:2, and the cyclone outer tube is composed of a cyclone blade, a cyclone blade, and a hollow area. The blades are naca6412 blade type, the number ranges from 4 to 8, the angle between the blades ranges from 45° to 60°, the axial size ratio between the top and bottom of the blades ranges from 1:1 to 1:2, and the cyclone outer tube is composed of a cyclone blade, a cyclone blade, and a hollow area. Both ends of the tube are open, the blades are arranged at the same interval around the cyclone outer tube axially, the outer side is fixedly connected to the inner pipe of the cyclone outer tube, the inner side faces the axis, the length of the blade is less than the radius of the vertical section of the cyclone outer tube, and multiple blades (12) surround the axis of the cyclone outer tube to form a hollow area, the radius of the hollow area ranges from 0.2 to 0.33 times the radius of the vertical section of the cyclone outer tube; the honeycomb consists of a honeycomb outer tube and regular hexagonal through holes (32), multiple regular hexagonal through holes are combined and inlaid and welded in the honeycomb outer tube, and the side length of the regular hexagonal through holes ranges from 0.05D to 0.2D.

[0008] Compared with the prior art, the advantages of the present invention are obvious, mainly manifested in:

[0009] The present invention provides a novel device for improving the uniformity of flow in a right-angle bend pipeline and improving the accuracy of the test. When the fluid flows through the bend, a vortex will be formed on the inner side of the bend due to the action of centrifugal force. The guide vanes of the cyclone can break up the vortex and break the upper and lower pressure differences. Compared with existing devices with the same function, it is more convenient to use, and the size can be changed according to the diameter of the pipeline without changing the structure of the pipeline itself. It can effectively improve the uniformity of pipeline flow and make the fluid reach a relatively uniform point in advance in the pipeline. For tests such as measuring the flow rate of fluid in the pipeline, it can cause the flow to become uniform in advance, improve the measurement accuracy, and reduce the required pipeline length. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention has attached Figure 5 Of which:

[0011] Figure 1 It is the installation schematic diagram of the present invention;

[0012] Figure 2 for Figure 1 Left view of

[0013] Figure 3 A schematic diagram of the blade of the invention;

[0014] Figure 4 Comparison of streamline effects of the present invention without using a cyclone and using a cyclone at the vortex;

[0015] Figure 5This is a streamline effect diagram of the device used in the present invention.

[0016] Among them, 1. cyclone, 11. cyclone outer tube, 12. blades, 13. hollow area, 2. connecting pipe, 3. honeycomb rectifier, 31. honeycomb outer tube, 32. regular hexagonal through hole. DETAILED DESCRIPTION

[0017] like Figure 1 , 2 , 3, 4, and 5 show a device for improving the flow uniformity of a right-angle bend pipeline, comprising a cyclone 1, a connecting pipeline 2, and a honeycomb rectifier 3, characterized in that the cyclone 1 and the honeycomb rectifier 3 are respectively arranged at both ends of the connecting pipeline 2 and welded together, and the length ratio of the cyclone 1, the connecting pipeline 2, and the honeycomb rectifier 3 is in the range of 1:2:2-1:10:3; the cyclone 1 is composed of a cyclone outer tube 11, blades 12, and a hollow area 13, the blades 12 adopt a naca6412 blade type, the number ranges from 4 to 8, the angle between each blade 12 ranges from 45° to 60°, and the axial size ratio between the top and bottom of the blade 12 ranges from 1:1 to 1:2 Both ends of the cyclone outer tube 11 are open, the blades 12 are arranged around the cyclone outer tube 11 at the same interval in the axial direction, the outer side is fixedly connected to the inner pipe of the cyclone outer tube 11, and the inner side faces the axis. The length of the blade 12 is less than the radius of the vertical section of the cyclone outer tube 11. Multiple blades 12 surround the axis of the cyclone outer tube 11 to form a hollow area 13, and the radius of the hollow area 13 ranges from 0.2 to 0.33 times the radius of the vertical section of the cyclone outer tube 11; the honeycomb 3 consists of a honeycomb outer tube 31 and a regular hexagonal through hole 32. A plurality of regular hexagonal through holes are combined, inlaid and welded in the honeycomb outer tube 31, and the side length of the regular hexagonal through hole ranges from 0.05D to 0.2D.

[0018] It can be seen from the simulation streamline diagram that the added device can effectively integrate the flow direction of the fluid, reduce the vortex caused by centrifugal force, and reduce energy loss. In order to reduce the swirl degree caused by the presence of the cyclone, a honeycomb rectifier can be added after the cyclone to achieve a better rectification effect.

Claims

1. A device for improving the flow uniformity of a right-angle bend pipeline, comprising a cyclone (1), a connecting pipeline (2), and a honeycomb rectifier (3), characterized in that The cyclone (1) and the honeycomb rectifier (3) are respectively arranged at both ends of the connecting pipe (2) and welded together. The length ratio of the cyclone (1), the connecting pipe (2) and the honeycomb rectifier (3) is in the range of 1:2:2-1:10:

3. The cyclone (1) is composed of a cyclone outer tube (11), blades (12) and a hollow area (13). The blades (12) are of NACA6412 blade type and the number is in the range of 4-8. The angle between each blade (12) is in the range of 45°-60°. The axial dimension ratio between the top and the bottom of the blade (12) is in the range of 1:1-1:

2. Both ends of the cyclone outer tube (11) are open. The blades (12) surround the cyclone. The outer tube (11) of the cyclone is arranged at the same interval in the axial direction, the outer side is fixedly connected to the inner pipe of the outer tube (11) of the cyclone, and the inner side faces the axis. The length of the blade (12) is less than the radius of the vertical section of the outer tube (11) of the cyclone. A plurality of blades (12) surround the axis of the outer tube (11) of the cyclone to form a hollow area (13). The radius of the hollow area (13) is in the range of 0.2-0.33 times the radius of the vertical section of the outer tube (11) of the cyclone. The honeycomb (3) is composed of the outer tube (31) of the honeycomb and regular hexagonal through holes (32). A plurality of regular hexagonal through holes are assembled and welded in the outer tube (31) of the honeycomb, and the side length of the regular hexagonal through holes is in the range of 0.05D-0.2D.

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