CN102536973B - Mounting position confirming method for guide vanes at joint of pipeline and box - Google Patents
Mounting position confirming method for guide vanes at joint of pipeline and box Download PDFInfo
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- CN102536973B CN102536973B CN 201210040951 CN201210040951A CN102536973B CN 102536973 B CN102536973 B CN 102536973B CN 201210040951 CN201210040951 CN 201210040951 CN 201210040951 A CN201210040951 A CN 201210040951A CN 102536973 B CN102536973 B CN 102536973B
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- pipeline
- guide vane
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- casing
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000012530 fluid Substances 0.000 claims abstract description 36
- 239000007788 liquid Substances 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000284 extract Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
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- 238000009792 diffusion process Methods 0.000 description 1
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Abstract
The invention discloses a mounting position confirming method for guide vanes at the joint of a pipeline and a box. The method includes the steps: firstly, simulating a fluid velocity field at the joint of the box and the pipeline; secondly, drawing a semicircle p by passing through points (-1.33x0, 0), (0, 1.33x0) and (1.33x0, 0); thirdly, extracting velocity values (x, y and vxy) on the semicircle p in the simulated fluid velocity field; fourthly, drawing an x-vxy curve, equally dividing an area enclosed by the x-vxy curve and an x axis into (n+1) parts by the aid of n straight lines perpendicular to the x axis, and recording x-axis coordinates xi respectively corresponding to the n straight lines used for equally dividing the area; fifthly, respectively fixing n guide vanes onto a support, wherein the x-axis coordinates of connecting points of the guide vanes i and the support in a coordinate system M; and sixthly, leading the connecting point of each guide vane and the support, the central point of the bottom of each guide vane and an original point o of the coordinate system M to be positioned on the same straight line. By the aid of the method, the flow rate of fluids flowing into the box from the pipeline can be uniform in all directions.
Description
Technical field
The invention belongs to fluid flow equalize technology field, method is determined in the mounting point that is specifically related to the guide vane of a kind of pipeline and casing joint.
Background technique
Pipeline is connected connection with casing be combination common in fluid system, and the fluid flow skewness on all directions of pipeline and casing joint is also the problem that can not be ignored.Because the size of pipeline is less with respect to casing, both joints certainly exist the process of a direction of flow and change in flow.But the great disparity due to pipeline and casing physical dimension, make ducted fluid in entering the process of casing, flow velocity difference on all directions is very large, the rate of flow of fluid that is the intermediate portion is large, and periphery bit stream speed is little, this is unfavorable for the diffusion of fluid in casing, and sometimes also affects technological effect, does not reach default fluid distribution.
In prior art, even along the flow of all directions in order to make by the fluid of pipeline inflow casing, the guide vane of suitable quantity is installed in the joint of pipeline and casing, the guide vane of installing is more than or equal to 2, its concrete number is different because of the degree that pipe diameter, box sizes and fluid current-sharing require, existing problem is that the mounting point of each guide vane is normally arbitrarily determined, so just farthest convection cell plays the effect of current-sharing.
Summary of the invention
For defective or the deficiency of prior art, the object of the present invention is to provide the mounting point of the guide vane of a kind of pipeline and casing joint to determine method, so that it is even along the flow of all directions to flow into the fluid of casing by pipeline.
For realizing above-mentioned technical assignment, the present invention adopts following technical proposals to be achieved:
Method is determined in the mounting point of the guide vane of a kind of pipeline and casing joint, it is characterized in that, even along the flow of all directions in order to make by the fluid of pipeline inflow casing, at pipeline and casing joint, support is installed, n sheet guide vane is installed on this support, and adopt the following methods step to determine the mounting point of n sheet guide vane on support, wherein: n is the positive integer more than or equal to 2, guide vane i is the guide vane in n sheet guide vane, and i is positive integer and i ∈ [1, n]:
Step 2 is set up a two-dimensional coordinate system M, and the central point that pipeline and casing intersect the cross section is the initial point o of system of coordinates M, appoints a diameter of getting casing and pipeline crossing cross section as the x axle, and the medial axis of pipeline is the y axle, and fluid flow direction is the postive direction of y axle; Casing and pipeline intersect the profile line in cross section and the coordinate of x axle intersection point is (x
0, 0) and (x
0, 0);
Step 5 is drawn x-v
xyCurve uses n bar straight line perpendicular to the x axle with x-v
xyThe area that curve and x axle surround is divided into (n+1) part, and the timesharing such as record n bar straight line used is corresponding x axial coordinate x separately
i
Step 6 is individually fixed in n sheet guide vane on support, and the coordinate of the tie point of guide vane i and support in system of coordinates M is (x
i, y
i), and
x
i∈ [1.33x
0, 1.33x
0], y
i∈ [0,1.33x
0]; And the central point of the tie point of guide vane i and support, guide vane i bottom surface and the initial point o of system of coordinates M are located along the same line.
The edge shape of described guide vane adopts the profile of aerofoil profile NPU-LS 0417.
Adopt method of the present invention can effectively make by the fluid of pipeline inflow casing even along the flow velocity of all directions.
Description of drawings
Fig. 1 is the mounting point schematic diagram of guide vane in embodiment;
Fig. 2 is to x-v in embodiment
xyThe area that curve and x axle surround carries out the result schematic diagram of decile;
Fig. 3 is the front velocity distribution contrast schematic diagram with installing on guide vane rear semicircle p of embodiment's installation guide vane.
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail.
Embodiment
Even along the flow of all directions in order to make by the fluid of pipeline inflow casing, at pipeline and casing joint, support is installed, specifically, this support or be installed on pipeline or be installed on casing is equipped with n sheet guide vane on this support, and adopts the following methods step to determine the mounting point of n sheet guide vane on support, wherein: n is the positive integer more than or equal to 2, guide vane i is the guide vane in n sheet guide vane, and i is positive integer and i ∈ [1, n]:
Step 2 is set up a two-dimensional coordinate system M, and the central point that pipeline and casing intersect the cross section is the initial point o of system of coordinates M, appoints a diameter of getting casing and pipeline crossing cross section as the x axle, and the medial axis of pipeline is the y axle, and fluid flow direction is the postive direction of y axle; Casing and pipeline intersect the profile line in cross section and the coordinate of x axle intersection point is (x
0, 0) and (x
0, 0);
when fluid flows into casing from pipeline, the flow velocity of fluid has a sudden change at the interface place of pipeline and casing, namely the flow velocity at this interface place fluid begins to occur obvious variation, the current-sharing that the application will realize, after making exactly fluid enter casing from pipeline, flow on the same distance all directions in center of the interface of distance pipeline and casing approaches, due to distance interface center equidistant same take the interface center on the hemisphere face of the centre of sphere, so namely will make on take the interface center as the hemisphere face of the centre of sphere flow on all directions close, mainstream speed when fluid flows into casing by pipeline in addition is perpendicular to the interface of pipeline and casing, be that the mainstream speed direction of fluid is in the xoy plane, and the size of mainstream speed is all larger to flow effect than the speed of other any directions, so only need extract the velocity amplitude on xoy plane and hemispherical intersection (being semi-circular line), just can know the velocity distribution of its elsewhere of hemisphere face.
Simultaneously, the radius of semi-circular line is relevant with the flow velocity of the diameter of pipeline and fluid, the design pipeline the time, generally to use the supposition flow velocity method, size through waterpower calculative determination pipeline, that is to say between the size of the flow velocity of fluid and pipeline has certain corresponding relation, therefore mainly consider the size of pipeline and the relation of semicircle p radius when determining semicircle p radius.In order to determine semicircle p radius, the claimant has done a series of analog studies, in the xoy plane, extract the rate of flow of fluid on the semicircle under pipeline radius and the half different ratios of circle radius, the ratio of pipeline radius and semi-circular line radius is taken as respectively 1,0.9,0.75,0.5,0.4,0.25, the speed numerical value that extracts is compared, the ratio of finding pipeline radius and half circle radius is 0.75 o'clock, flow speed value nonuniformity on semicircle is maximum, therefore the radius of the semi-circular line studied is defined as 1.33 times of pipeline radius; Therefore in system of coordinates M, cross point (1.33x
0, 0), (0,1.33x
0) and (1.33x
0, 0) and make semicircle p take initial point o as the center of circle;
Step 5 is drawn x-v
xyCurve uses n bar straight line perpendicular to the x axle with x-v
xyThe area that curve and x axle surround is divided into (n+1) part, and the timesharing such as record n bar straight line used is corresponding x axial coordinate x separately
i
In this step why to x-v
xyThe area that curve and x axle surround carry out decile be because: x-v
xyIn plotted curve, abscissa be x to coordinate, y coordinate is the speed v of fluid
xy, and flow Q equals the speed v of fluid
xyMultiply by circulation area A, in this application, the x that circulation area A equals passage to length a multiply by with system of coordinates M place face Vertical direction on length b, i.e. Q=v
xy* A=v
xy* a * b, if with guide vane, whole passage is divided into (n+1) individual small channel, the b of each small channel is the same so, as long as guarantee v
xy* a (is x-v
xyThe area that curve in plotted curve and x axle surround) consistent, can guarantee that the interior flow Q of each small channel that diversed blade is divided into is consistent, namely guarantee to equate perpendicular to the flow in each runner of mainstream speed direction is intimate, reached the purpose of current-sharing, for guaranteeing x-v in each passage
xyCurve in plotted curve equates with the area that the x axle surrounds, will be with x-v
xyThe area that curve and x axle surround carries out decile;
Step 6 is individually fixed in n sheet guide vane on support, and the coordinate of the tie point of guide vane i and support in system of coordinates M is (x
i, y
i), and
x
i∈ [1.33x
0, 1.33x
0], y
i∈ [0,1.33x
0]; For guaranteeing x-v in each passage
xyCurve in plotted curve equates with the area that the x axle surrounds, and the position of guide vane must be according to the location arrangements of dividing line in step 5, so just can make a value of each passage consistent with setting value in step 5; And for each guide vane, the central point of the tie point of itself and support, this guide vane bottom surface and the initial point o of system of coordinates M are located along the same line.
The edge shape of described guide vane adopts the profile of aerofoil profile NPU-LS 0417.In order to reduce the barrier effect of guide vane Shapes body as far as possible, the claimant is in conjunction with the applicable cases of physics drag reduction technology in automobile and aviation industry field, and the guide vane of 8 kinds of different form structure has been carried out analog study.The form structure of these 8 kinds of guide vanes is respectively: ellipse, wedge shape, the A8L of Audi body contour, Porsche 911 body contours, Porsche 911 body contour improved forms, aerofoil profile NPU-LS 0515 profile, aerofoil profile NPU-LS 0417 profile, aerofoil profile NPU-L72513 profile.Through pipeline and the liquid speed field, casing joint after these 8 kinds of shape guide vanes of contrast installation, the resistance of the guide vane convection cell of discovery use aerofoil profile NPU-LS 0417 profile is minimum.
Embodiment:
The claimant adds before current equalizer to embodiment and the velocity field of pipeline afterwards and casing joint has been carried out numerical simulation study, result as shown in Figure 3, through comparing, after adding the fluid current equalizer of pipeline and casing joint, fluid is obviously even than not adding before current equalizer along the flow velocity of all directions.
Need to prove, in method of the present invention, related fluid is liquid or gas.
Claims (2)
1. method is determined in the mounting point of the guide vane of a pipeline and casing joint, it is characterized in that, even along the flow of all directions in order to make by the fluid of pipeline inflow casing, at pipeline and casing joint, support is installed, n sheet guide vane is installed on this support, and adopt the following methods step to determine the mounting point of n sheet guide vane on support, wherein: n is the positive integer more than or equal to 2, guide vane i is the guide vane in n sheet guide vane, and i is positive integer and i ∈ [1, n]:
Step 1 is utilized the liquid speed field of FLUENT software for calculation analog unit and pipeline junction;
Step 2 is set up a two-dimensional coordinate system M, and the central point that pipeline and casing intersect the cross section is the initial point o of system of coordinates M, appoints a diameter of getting casing and pipeline crossing cross section as the x axle, and the medial axis of pipeline is the y axle, and fluid flow direction is the postive direction of y axle; Casing and pipeline intersect the profile line in cross section and the coordinate of x axle intersection point is (x
0, 0) and (x
0, 0);
Step 3 in system of coordinates M, is crossed point (1.33x
0, 0), (0,1.33x
0) and (1.33x
0, 0) and make semicircle p take initial point o as the center of circle;
Step 4 in the liquid speed field of simulating, is extracted velocity amplitude (x, y, v on semicircle p
xy), wherein: x ∈ [1.33x
0, 1.33x
0], y ∈ [0,1.33x
0];
Step 5 is drawn x-v
xyCurve uses n bar straight line perpendicular to the x axle with x-v
xyThe area that curve and x axle surround is divided into (n+1) part, and the timesharing such as record n bar straight line used is corresponding x axial coordinate x separately
i
Step 6 is individually fixed in n sheet guide vane on support, and the coordinate of the tie point of guide vane i and support in system of coordinates M is (x
i, y
i), and
x
i∈ [1.33x
0, 1.33x
0], y
i∈ [0,1.33x
0]; And the central point of the tie point of guide vane i and support, guide vane i bottom surface and the initial point o of system of coordinates M are located along the same line.
2. method is determined in the mounting point of the guide vane of pipeline as claimed in claim 1 and casing joint, it is characterized in that, the edge shape of described guide vane adopts the profile of aerofoil profile NPU-LS 0417.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210040951 CN102536973B (en) | 2012-02-22 | 2012-02-22 | Mounting position confirming method for guide vanes at joint of pipeline and box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210040951 CN102536973B (en) | 2012-02-22 | 2012-02-22 | Mounting position confirming method for guide vanes at joint of pipeline and box |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102536973A CN102536973A (en) | 2012-07-04 |
| CN102536973B true CN102536973B (en) | 2013-05-08 |
Family
ID=46344698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201210040951 Expired - Fee Related CN102536973B (en) | 2012-02-22 | 2012-02-22 | Mounting position confirming method for guide vanes at joint of pipeline and box |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1243567A (en) * | 1997-09-22 | 2000-02-02 | 川野通彦 | Suction elbow provided with built-in guide blades |
| CN1915474A (en) * | 2005-11-15 | 2007-02-21 | 江苏宇达电站辅机阀门制造有限公司 | Method for adjusting airflow distribution of electricity and fabric combined dust catcher, and equipment |
| CN101389399A (en) * | 2006-02-24 | 2009-03-18 | Lg化学株式会社 | Heat medium distributor for annular duct of reactor and heat exchanger |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2420476C (en) * | 2003-02-28 | 2010-07-27 | Robert Bonthron Durward | Method and apparatus for enhancing fluid velocities in pipelines |
-
2012
- 2012-02-22 CN CN 201210040951 patent/CN102536973B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1243567A (en) * | 1997-09-22 | 2000-02-02 | 川野通彦 | Suction elbow provided with built-in guide blades |
| CN1915474A (en) * | 2005-11-15 | 2007-02-21 | 江苏宇达电站辅机阀门制造有限公司 | Method for adjusting airflow distribution of electricity and fabric combined dust catcher, and equipment |
| CN101389399A (en) * | 2006-02-24 | 2009-03-18 | Lg化学株式会社 | Heat medium distributor for annular duct of reactor and heat exchanger |
Non-Patent Citations (2)
| Title |
|---|
| 李红旗.矿用轴流式主通风机叶片安装尺寸的确定.《煤矿机械》.2009,(第30卷第09期), |
| 矿用轴流式主通风机叶片安装尺寸的确定;李红旗;《煤矿机械》;20090930(第30卷第09期);47－48页 * |
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| Publication number | Publication date |
|---|---|
| CN102536973A (en) | 2012-07-04 |
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Granted publication date: 20130508 |