CN112173722B

CN112173722B - Fluid conveying device

Info

Publication number: CN112173722B
Application number: CN202010951402.5A
Authority: CN
Inventors: 李国祯; 王筝; 菲利普·赫尔; 尼克·迈尔斯
Original assignee: University of Nottingham Ningbo China
Current assignee: University of Nottingham Ningbo China
Priority date: 2020-08-05
Filing date: 2020-09-10
Publication date: 2022-04-22
Anticipated expiration: 2040-09-10
Also published as: CN112173722A

Abstract

A fluid conveying device is disclosed, in which a first transition section is located on the inner pipe wall near a first end of an input fluid, and has a first length and a first cross section in the longitudinal direction of a vortex flow pipe, the first cross section is smoothly changed from a circular shape with a radius R into a vane shape while the first transition section is twisted by a first predetermined angle in the longitudinal direction, the first cross section is twisted by the first predetermined angle in the longitudinal direction in a non-linear gradual manner, a third cross section is smoothly changed from a vane shape into a circular shape with a radius R while the second transition section is twisted by a third predetermined angle in the longitudinal direction, the third cross section is twisted by the second transition section in a non-linear gradual manner by a third predetermined angle in the longitudinal direction, the cross section area of the third cross section is kept constant, at least one vortex flow pipe is arranged among a plurality of fluid conveying pipes, one end of the second transition section is connected to receive a swirling flow fluid containing suspended solid particles, and the fluid conveying pipe has a fourth cross section.

Description

Fluid conveying device

Technical Field

The invention relates to the technical field of pipeline transportation, in particular to a fluid conveying device.

Background

Pipeline transportation is a method of transporting solid through pipeline by breaking it into powder, preparing slurry (or gas powder mixture) with proper amount of liquid (or gas). The pipeline transportation has the characteristics of large transportation amount, small occupied area, small energy consumption, safety, reliability, no pollution, short transportation distance (relative to truck transportation), low cost and the like, and is not influenced by climate.

It can be divided into liquid delivery pipeline and air delivery pipeline according to the carrier. The carrier of the liquid conveying pipeline is generally water. The air supply pipeline uses compressed air as a carrier. At present, slurry conveying technology is adopted for long-distance and large-output solid slurry pipelines. The efficiency of pipeline transportation is affected by the slurry pipeline flow regime. Under the same flow velocity, because of the difference of particle size, density, concentration, etc., three basic flow states can be formed: homogeneous flow state, namely particles are evenly suspended on the cross section of the pipeline, and the solid concentration of each point is the same; semi-homogeneous flow state, that is, fine particles are uniformly distributed on the upper part of the full section of the pipeline, but large particles move on the lower part, so that the concentration of the lower part is high, the concentration of the upper part is low, but particle precipitation cannot occur; heterogeneous flow state, i.e. very uneven concentration distribution on the full section, solid particle precipitation and a precipitation layer at the bottom of the pipeline. Generally, a pure homogeneous slurry is rare. When the flow rate is varied, the slurry will be converted between a homogeneous flow and a semi-homogeneous flow, or a semi-homogeneous flow and a non-homogeneous flow. The flow rate when the slurry is sedimented becomes the critical flow rate. In order to avoid plugging of the pipeline due to precipitation, the solid pipe section should transport the slurry above the critical speed. The critical flow rate is large and the energy consumption is also large.

Another factor contributing to pipe blockage is pipe slope. The solid slurry pipeline is usually intermittently conveyed to regulate the conveying amount, and solid particles can be precipitated after the transportation is stopped. If the pipe slope is greater than the natural angle of repose of the sediment, the sediment will move downward, forming a blockage. If the stack length is too long, it will cause difficulties in restarting.

Aiming at the problems in the pipeline transportation, the method for improving the uniformity of the solid concentration of the slurry at a lower critical flow speed by changing the flow state of the solid slurry is provided.

The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is well known to those of ordinary skill in the art.

Disclosure of Invention

In order to solve the above problems, the present invention provides a fluid transfer device that generates a vortex flow to improve pipeline transportation efficiency, consumes less energy, and prevents a pipeline from being clogged. The purpose of the invention is realized by the following technical scheme.

A fluid delivery device comprises a fluid delivery device including,

at least one vortex flow tube generating a vortex flow, the vortex flow tube comprising a structural body and an inner tube wall provided in the structural body, the structural body having one end into which a fluid containing suspended solid particles is input and the other end out of which a vortex flow fluid containing suspended solid particles is formed, the inner tube wall comprising,

a first transition section located at a first end of the inner tube wall near the input fluid, the first transition section having a first length in a longitudinal direction of the vortex flow tube and a first cross section smoothly transitioning from a circular shape with a radius R to a vane shape while the first transition section twists in the longitudinal direction by a first predetermined angle, the first cross section non-linearly transitioning in the longitudinal direction by the first predetermined angle as the first transition section twists in the longitudinal direction, the vane shape comprising a square with a side length of 2R and a semicircle with a radius R extending on each side of the square, a cross-sectional area of the first cross section remaining constant,

a swirl flow section connecting the first transition section, the swirl flow section having a second length in a longitudinal direction of the swirl flow tube and a second cross section that is the shape of the vane as the swirl flow section twists by a second predetermined angle in the longitudinal direction,

a second transition section connecting the swirling flow section and located at the inner tube wall near the second end of the fluid conveying tube, the second transition section having a third length and a third cross-section in the longitudinal direction of the swirling flow tube, the third cross-section smoothly changing from the vane shape to a circle with a radius R while the second transition section is twisted by a third predetermined angle in the longitudinal direction, the third cross-section being twisted by a third predetermined angle in the longitudinal direction in a non-linear gradual manner, the cross-sectional area of the third cross-section remaining constant, the cross-sectional areas of the first, second and third cross-sections being the same;

a plurality of fluid conveying pipes, at least one vortex flow pipe is arranged among the fluid conveying pipes, one end of the vortex flow pipe is connected with the second transition section to receive vortex flow fluid containing suspended solid particles, and the fluid conveying pipes have a fourth cross section.

In the fluid delivery device, the first cross-sectional torsion angle is gradually changed based on an alpha transition curve, wherein,

l1 is the first length, and x1 is the position coordinate of the first cross section in the length direction.

In the fluid delivery device, the third cross-sectional torsion angle is gradually changed based on an alpha transition curve, wherein,

l3 is the third length, and x3 is the position coordinate of the third cross-section in the length direction.

In the fluid conveying device, the first cross section torsion angle and/or the third cross section torsion angle are gradually changed based on a Vitoseski curve or a cosine function.

In the fluid conveying device, the structural body is a straight pipe, the radius R is 0.01m to 100m, and the ratio of the sum of the first length, the second length and the third length to the radius R is 8: 1.

In the fluid conveying device, the first length is one fourth of the length of the structural body, the second length is one half of the length of the structural body, and the third length is one fourth of the length of the structural body.

In the fluid delivery device, the first predetermined angle is 90 degrees, the second predetermined angle is 180 degrees, and the third predetermined angle is 90 degrees.

In the fluid transfer device, a ratio of the first length or the third length to the second length is equal to a ratio of the first predetermined angle or the third predetermined angle to the second predetermined angle.

In the fluid conveying device, the fluid conveying pipe is connected with the vortex pipe in a flange mode, and the fluid is gas of suspended solid particles or liquid of the suspended solid particles.

In the fluid conveying device, the fluid conveying pipe is a straight pipe, an expansion pipe, a contraction pipe or an elbow.

In the fluid transfer device, the ratio of the sum of the first length, the second length and the third length to the radius R is 16:1 to 4: 1.

In the fluid conveying device, the vortex flow pipe comprises a first transition section, n vortex flow sections and a second transition section, wherein n is a natural number larger than 1.

In the fluid transfer device, the first predetermined angle is 90 degrees, the second predetermined angles are n 180 degrees, and the third predetermined angle is 90 degrees.

In the fluid delivery device, the sum of the first predetermined angle, the second predetermined angle and the third predetermined angle is n +1 180 degrees.

Technical effects

The invention can generate vortex flow without external energy supply. No part extending out of the pipeline can not block the pipeline. The invention carries out local intervention on the position which is easy to cause particle sedimentation and block the pipeline, improves the conveying efficiency and reduces the energy consumption under the condition of not improving the overall conveying speed, improves the slurry conveying efficiency by taking water as a medium and also can improve the powder conveying efficiency by taking gas as a medium. Vortex flow tube can be at the return bend to and the great part of slope, improve the degree of consistency of granule at the pipeline cross-section, avoid a large amount of granule to concentrate striking specific position, cause the local wear of pipe fitting. The invention has the effect of locally increasing the kinetic energy of particles, can more effectively push the settled particles after shutdown, can recover the flow under the condition of unchanged starting pressure, and obviously improves the uniformity of solid particles suspended in fluid.

The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly apparent, and to make the implementation of the content of the description possible for those skilled in the art, and to make the above and other objects, features and advantages of the present invention more obvious, the following description is given by way of example of the specific embodiments of the present invention.

Drawings

Various other advantages and benefits of the present invention will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. Also, like parts are designated by like reference numerals throughout the drawings.

In the drawings:

FIG. 1 is a schematic diagram of a fluid delivery device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a fluid delivery device according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a fluid delivery device according to an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of an inner wall at a transition stage location in a transition section of a vortex flow tube of a fluid transport device;

FIG. 5 is a schematic cross-sectional view of a complete blade shape after completion of the ramp in the ramp section of the vortex tube of the fluid delivery device;

FIG. 6 is a comparative schematic illustration of different gradations of a fluid delivery device of one embodiment of the present invention;

FIG. 7 is a schematic comparison of particle volume fraction downstream of an eddy current tube and a straight comparison tube according to an embodiment of the present invention;

FIG. 8 is a schematic illustration of a comparison of particle velocity downstream of a vortex flow tube and a comparison straight tube according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of the alpha transition curve and tangential velocity contrast for a non-linear ramp and a normal linear ramp using a Witoshib curve for one embodiment of the present invention;

FIG. 10 is a graph showing a comparison of the alpha transition curve and wall shear using a Witosynsky curve for a non-linear ramp versus a normal linear ramp in accordance with an embodiment of the present invention;

fig. 11 is a graph showing a comparison of pressure loss for an alpha transition curve and a non-linear ramp and a normal linear ramp using a victoris-based curve according to an embodiment of the present invention.

The invention is further explained below with reference to the figures and examples.

Detailed Description

Specific embodiments of the present invention will be described in more detail below with reference to fig. 1 to 11. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the invention, but is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present invention is defined by the appended claims.

It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the accompanying drawings are only used for distinguishing some objects and are not used for describing a specific order or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances for describing embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Furthermore, spatially relative terms such as "above/below … …", "above/below … …", "above/below … …", "above … …", and the like, may be used herein to describe the spatial relationship of one device or feature to another device or feature for ease of description. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the present disclosure. For example, if a device is turned over, devices described as "above" or "above" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "at/at the lower end of … …" can encompass both an orientation of "at the lower end of … …" and "at the upper end of … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, longitudinal, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings or in the conventional placement case, only for the convenience of describing the present invention and simplifying the description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the scope of the present invention; similarly, the terms "inner and outer" refer to the inner and outer contours of the respective component itself.

For the purpose of facilitating understanding of the embodiments of the present invention, the following description will be made by taking specific embodiments as examples with reference to the accompanying drawings, and the drawings are not to be construed as limiting the embodiments of the present invention.

For better understanding, as shown in fig. 1 to 3, a fluid transfer device includes,

at least one vortex tube 1 for generating a vortex flow, the vortex tube 1 comprising a structural body and an inner tube wall arranged on the structural body, one end of the structural body is used for inputting a fluid containing suspended solid particles, the other end of the structural body is used for outputting the fluid to form the vortex flow fluid containing the suspended solid particles, the inner tube wall comprises,

a first transition section 3, which is located at a first end of the inner pipe wall close to the input fluid, and which has a first length in the longitudinal direction of the vortex flow pipe and a first cross section which smoothly transitions from a circular shape with a radius R to a vane shape while twisting the first transition section by a first predetermined angle in the longitudinal direction, the first cross section being twisted by a first predetermined angle in a non-linear transition in the longitudinal direction by the first transition section, the vane shape comprising a square with a side length of 2R and a semicircle with a radius R extending on each side of the square, the cross-sectional area of the first cross section remaining constant,

a swirling flow section 4 connecting the first transition section 3, the swirling flow section 4 having a second length in a longitudinal direction of the swirling flow tube and a second cross section which is the shape of the vane as the swirling flow section twists by a second predetermined angle in the longitudinal direction,

a second transition section 5 connecting the swirling flow section and located at the second end of the inner tube wall near the fluid conveying tube, the second transition section 5 having a third length and a third cross-section in the longitudinal direction of the swirling flow tube, the third cross-section smoothly changing from the vane shape to a circle with a radius R while the second transition section is twisted by a third predetermined angle in the longitudinal direction, the third cross-section being twisted by a third predetermined angle in a non-linear gradual manner in the longitudinal direction, the cross-sectional area of the third cross-section remaining unchanged, the cross-sectional areas of the first, second and third cross-sections being the same;

a plurality of fluid conveying pipes 2, at least one vortex flow pipe 1 is arranged between the fluid conveying pipes 2, one end of the vortex flow pipe 1 is connected with the second transition section 5 to receive vortex flow fluid containing suspended solid particles, and the fluid conveying pipes 2 have a fourth cross section.

In a preferred embodiment of the fluid delivery device, the first cross-sectional twist angle is gradual based on an alpha transition curve, wherein,

In a preferred embodiment of the fluid delivery device, the third cross-sectional twist angle is gradual based on an alpha transition curve, wherein,

In a preferred embodiment of the fluid delivery device, the first cross-sectional torsion angle and/or the third cross-sectional torsion angle is/are graduated based on a victorissis curve or a cosine function.

In a preferred embodiment of the fluid transfer device, the structural body is a straight pipe, the radius R is 0.01m to 100m, and the ratio of the sum of the first length, the second length and the third length to the radius R is 8: 1.

In a preferred embodiment of the fluid transfer device, the first length is one fourth of the length of the structural body, the second length is one half of the length of the structural body, and the third length is one fourth of the length of the structural body.

In a preferred embodiment of the fluid transfer device, the first predetermined angle is 90 degrees, the second predetermined angle is 180 degrees, and the third predetermined angle is 90 degrees.

In a preferred embodiment of the fluid transfer device, the ratio of the first length or the third length to the second length is equal to the ratio of the first predetermined angle or the third predetermined angle to the second predetermined angle.

In the preferred embodiment of the fluid delivery apparatus, the fluid delivery pipe 2 is flange-connected to the vortex pipe, and the fluid is gas or liquid in which solid particles are suspended.

In the preferred embodiment of the fluid delivery device, the fluid delivery tube 2 is a straight tube, an expansion tube, a contraction tube or an elbow.

In a preferred embodiment of the fluid transfer device, the fourth cross-section is smaller than the second cross-section.

In a preferred embodiment of the fluid transfer device, the fourth cross-section is equal to the second cross-section.

In the preferred embodiment of the fluid transport device, one end of a fluid transport pipe 2 having a pipe slope is connected to the vortex pipe 1.

In one embodiment, as shown in fig. 4 to 5, in the process of gradually changing the cross-sectional shape of the inner wall of the tube of the first gradual change section 3 and the second gradual change section 5 from a circular shape to a blade-shaped cross-section, the cross-section is axially rotated clockwise or counterclockwise by a predetermined angle. The cross section of the inner wall of the pipe in a transition stage in the gradual change region is shown in fig. 4, and the cross section of the complete blade shape after the gradual change is shown in fig. 5, wherein Rcs is the diameter of the inner square circumscribed circle after the gradual change is completed. And R is the diameter of the internal square circumscribed circle in the gradual change process. rf is the radius of the blade-shaped fan after the gradual change is finished, and r is the radius of the blade-shaped fan in the gradual change process. A is the center of the blade-shaped fan, O is the center of the circumscribed circle of the inner square after the gradual change is finished, BDEF is four vertexes of the inner square after the gradual change is finished, and C is used for representing the circular arc BCD. y is the distance from A to the center O of the square circumscribed circle.

The angle formed by the radius of the blade-shaped fan and the square vertical side (FB). When the cross-section is circular

At 45 deg., when the cross-section is in the shape of a complete blade,

is 90 deg.. When in use

A series of transition sections may be formed as the angle gradually increases from 45 ° to 90 °. These sections are turned clockwise (or counterclockwise) through a predetermined angle in the course of the axial progression, and are twisted 90 ° clockwise in the illustration. If the change of the spacing between the sections is uniform during the clockwise rotation of the sections in the axial direction, the transition is a linear transition.

As shown in fig. 6, where x is the cross-sectional location coordinate from the circular cross-section in the transition tube, L is the length of the transition tube,

the angle formed by the radius of the blade-shaped fan and the square vertical side FB. When x is located at the circular cross-section, x =0, so x/L =0, when

Is 45 degrees; when x is in the complete blade shape, x = L, so x/L =1, at which time

Is 90 deg. when the cross section is circular

At 45 deg., when the cross-section is in the shape of a complete blade,

is 90 deg.. When in use

A series of transition sections may be formed as the angle gradually increases from 45 ° to 90 °. These sections are turned clockwise or counterclockwise through a predetermined angle during the axial progression, for example, by 90 ° clockwise in the illustration. In order to generate larger vortex intensity and reduce the on-way pressure loss, the invention can design a smoother transition mode at the initial section and the final section of the gradual change section, namely, the angle turned in a unit distance is smaller. Such as an alpha transition curve based on a cosine function, or using a vitoscinski curve (Vitosinski curve). Wherein the content of the first and second substances,

。

in the vortex flow tube 1, the ratio of the sum of the first length, the second length and the third length to the radius R is 8: 1, which is based on the ratio of the strength of the vortex generated by the vortex flow tube 1 to the pressure loss caused by the vortex flow tube. I.e. the maximum intensity of the vortex flow is generated with the minimum pressure loss.

In one embodiment, the vortex flow pipe 1 is used to replace a straight pipe section in a pipeline conveying system, and a clamp or a flange is connected in front of an element which needs to improve the suspension effect of solid particles. These elements may be straight pipes, more sloped pipes, or elbows, etc. When a straight pipe section is connected, the vortex flow pipe 1 is used for replacing a part of straight pipes, vortex flow can be induced and generated at the rear of the vortex flow pipe, the suspension effect of particles at the rear of the vortex flow pipe is enhanced, and therefore the conveying flow speed is reduced, and the energy consumption is reduced. Meanwhile, the particles are suspended, so that the friction erosion of the particles to the pipe wall can be reduced, the pipeline is protected, and the service life of the pipeline is prolonged. When the pipe is connected to the front of a pipeline with a slope, the generated vortex flow can apply tangential and radial velocities to particles deposited on the inclined pipe section, the concentration uniformity of the section of the pipeline is improved, and the wall surface is blocked. Meanwhile, the particles are suspended, so that the friction erosion of the particles to the pipe wall can be reduced, the pipeline is protected, and the service life of the pipeline is prolonged. When the elbow is connected, a vortex flow pipe is used for replacing a part of straight pipe, vortex flow can be induced and generated at the rear of the vortex flow pipe, the suspension effect of particles in the elbow at the rear of the vortex flow pipe is enhanced, and wall particles are deposited at the elbow due to gravity, so that the pipeline is blocked. Meanwhile, the particles are suspended, so that the concentrated friction erosion of the particles to the bent pipe can be reduced, the bent pipe is protected, and the service life of parts is prolonged.

To further understand the present invention, in one embodiment, as shown in fig. 7, a vortex flow tube transports powder through air in a straight tube to increase the suspension effect of particles. CFD simulation result shows that when the gas velocity is 10m/s, at vortex flow pipe and contrast straight tube rear, the concentration distribution of powder appears obvious difference, and vortex flow can make the powder distribution of its rear more even, and the concentration difference is less, belongs to semi-homogeneous flow state. And the deposition phenomenon is concentrated on the lower part of the pipeline after the contrast straight pipe. As shown in fig. 8, in view of the comparison of the volume fractions of solids downstream of the swirl tube and the straight comparison tube, the volume fraction is low after the swirl tube because the particles are mixed more uniformly in the cross-section of the pipe and less sediment is deposited. For the vortex tube with the caliber of 50mm, the effective downstream range is about 3m, namely, the 60D range can play the roles of improving the transmission efficiency and reducing the particle accumulation. In addition, the particle velocity has larger axial velocity at a position far downstream of the vortex flow pipe, which shows that the vortex flow gives larger momentum to the particles, the following performance to the air of a transport medium is better, and the transport efficiency can be improved. The vortex flow pipe can avoid the particle to subside to return bend department, reduces the wearing and tearing of particulate matter pile foundation to the return bend, improves pipeline life's effect.

Compared with linear transition, the nonlinear transition mode can provide smoother transition, avoid local eddy and boundary layer separation generated by larger change of the shape of the section of the pipeline, cause larger local pressure loss, and influence the weakening of wall shearing force caused by boundary layer falling when the circular section is transited to the blade section. To illustrate the non-linear gradient enhanced vortex intensity of the present invention, different flow rates are simulated as shown in fig. 9, which shows a comparison between an α transition curve based on a cosine function and a non-linear gradient using a vittonsiki curve and a normal linear gradient, and the initial tangential velocity values at the outlet of the vortex flow pipe when the transition pipe uses three transition modes. The greater the shear velocity, the greater the eddy current intensity. It can be seen from the figure that as the pipe flow rate increases, the vortex strength increases. At each flow rate, the strength of the generated vortex was induced. The cross section is twisted in a non-linear gradual manner along the longitudinal direction of the gradual change section and is in a preset angle, the Wittonsisky transition mode is superior to the alpha transition mode, and the alpha transition mode is superior to the linear transition mode. There is a significant increase in the vortex flow effect when using a non-linear gradual twist preset angle. The linear transition mode produced cut velocity values 19.1-33.1% lower than the vittonsiki transition. Compared with the Wittonsiki transition, the cutting speed value generated by the alpha transition mode is 6.5 to 18.6 percent lower. Compared with linear transition, the provided non-linear gradual transition of an alpha transition mode, a Wittonsisky curve transition mode and the like generates larger initial tangential velocity, and the stronger vortex effect is also meant. The performance of the vortex tube is obviously improved.

FIG. 10 is a graph showing the comparison of the alpha transition curve and the wall shear force using the non-linear transition of the Witoshib curve and the normal linear transition of one embodiment of the present invention, and the CFD simulation of the inlet flow rate of 3m/s shows that the wall shear force behind the non-linear transition is significantly increased when the non-linear transition is used. Compared with linear transition, when an alpha transition mode is used, the shearing force of the wall surface is increased by 2% -8%; when the Wittonsiki curve transition mode is used, the shearing force of the wall surface is increased by 2% -13%. Fig. 11 is a graph showing a comparison of pressure loss for an alpha transition curve and a non-linear ramp and a normal linear ramp using a victoris-based curve according to an embodiment of the present invention. Meanwhile, compared with a linear transition mode, when the alpha transition mode is used, the pressure loss is reduced by 16% -28%; when the Wittonsiki curve transition mode is used, the pressure loss is reduced by 22-38%. Therefore, when the nonlinear transition is used, due to the fact that the smooth fluid channel is provided, the adverse effects of local turbulence, wall surface boundary layer separation and the like are caused on the wall surface, the pressure loss can be reduced to the maximum extent, and the energy consumption is reduced. Meanwhile, more energy is used for inducing and generating vortex flow, so that the generated vortex flow is higher in strength, and the effect of improving the wall surface shearing force is more obvious. The non-linear transition technology can enable the vortex flow pipe to play a more remarkable role in fluid conveying, reduce energy consumption and prolong the service life of process equipment. Due to the effect improvement brought by the nonlinear transition technology, the cost can be obviously reduced for enterprises, and the overall production efficiency is improved.

The above examples are only intended to illustrate the technical solutions of the present disclosure, not to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present disclosure.

Claims

1. A fluid transfer device, comprising,

a plurality of fluid conveying pipes, at least one vortex flow pipe is arranged between the fluid conveying pipes, one end of the vortex flow pipe is connected with the second transition section to receive vortex flow fluid containing suspended solid particles, the fluid conveying pipes have a fourth cross section, the torsion angle of the first cross section is gradually changed based on an alpha transition curve, wherein,

l1 is a first length, x1 is the position coordinate of the first cross-section in the length direction, and the third cross-section twist angle is gradual based on an alpha transition curve, wherein,

l3 is the third length, x3 is the position coordinate of the third cross section in the length direction, and the fourth cross section is smaller than the second cross section.

2. The fluid delivery device of claim 1, wherein the first cross-sectional twist angle and/or the third cross-sectional twist angle is graded based on a Vitoscinsky curve or a cosine function.

3. The fluid transfer device of claim 1, wherein the structural body is a straight tube, the radius R is 0.01m to 100m, and the ratio of the sum of the first length, the second length, and the third length to the radius R is 8: 1.

4. The fluid delivery device of claim 1, wherein the first length is one-quarter of the length of the structural body, the second length is one-half of the length of the structural body, and the third length is one-quarter of the length of the structural body.

5. The fluid delivery device of claim 1, wherein the first predetermined angle is 90 degrees, the second predetermined angle is 180 degrees, and the third predetermined angle is 90 degrees.

6. The fluid delivery device of claim 1, wherein a ratio of the first or third length to the second length is equal to a ratio of the first or third predetermined angle to the second predetermined angle.

7. The fluid delivery device of claim 1, wherein the fluid delivery tube is flanged to the vortex tube, and the fluid is a gas of suspended solid particles or a liquid of suspended solid particles.

8. The fluid delivery device of claim 1, wherein the fluid delivery tube is a straight tube, an expansion tube, a contraction tube, or an elbow.

9. The fluid delivery device of claim 1, wherein the ratio of the sum of the first length, the second length, and the third length to the radius R is from 16:1 to 4: 1.

10. The fluid delivery device of claim 1, wherein the vortex flow tube comprises a first transition section, n vortex flow sections, and a second transition section, n being a natural number greater than 1.

11. The fluid delivery device of claim 10, wherein the first predetermined angle is 90 degrees, the second predetermined angle is n 180 degrees, and the third predetermined angle is 90 degrees.

12. The fluid delivery device of claim 10, wherein the first, second, and third predetermined angles sum to n +1 180 degrees.