CN102536973A - 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 PDF

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CN102536973A
CN102536973A CN2012100409512A CN201210040951A CN102536973A CN 102536973 A CN102536973 A CN 102536973A CN 2012100409512 A CN2012100409512 A CN 2012100409512A CN 201210040951 A CN201210040951 A CN 201210040951A CN 102536973 A CN102536973 A CN 102536973A
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pipeline
guide vane
casing
point
support
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CN102536973B (en
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李安桂
陈曦
刘志坚
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Xian University of Architecture and Technology
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Xian University of Architecture and Technology
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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

Method is confirmed in the mounting point of the guide vane of pipeline and casing joint
Technical field
The invention belongs to fluid flow equalize technology field, method is confirmed in the mounting point that is specifically related to the guide vane of a kind of pipeline and casing joint.
Background technique
Being connected of pipeline and casing is combination common in the fluid system, and the fluid flow skewness on all directions of pipeline and casing joint also is 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 because the great disparity of pipeline and casing physical dimension; Make ducted fluid in the process that gets into casing, the flow velocity difference on all directions is very big, and promptly the rate of flow of fluid of intermediate portion is big; And periphery bit stream speed is little; This is unfavorable for the diffusion of fluid in casing, and also influences technological effect sometimes, does not reach preset fluid distribution state.
In the existing technology; To go into the fluid of casing by channel flow even along the flow of all directions in order to make; In the joint of pipeline and casing the guide vane of suitable quantity is installed, the guide vane of being installed is more than or equal to 2, and 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 confirmed, so just farthest convection cell plays the effect of current-sharing.
Summary of the invention
To the defective or the deficiency of existing technology, 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 confirm method, so that gone into the fluid of casing by channel flow even along the flow of all directions.
For realizing above-mentioned technical assignment, the present invention adopts following technical proposals to be achieved:
Method is confirmed in the mounting point of the guide vane of a kind of pipeline and casing joint, it is characterized in that, to go into the fluid of casing by channel flow even along the flow of all directions in order to make; At pipeline and casing joint support is installed, n sheet guide vane is installed on this support, and adopt following method step to confirm 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 the 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 the crossing cross section of pipeline 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 be that semicircle p is made in the center of circle with initial point o;
Step 4 in the liquid speed field of being simulated, is extracted velocity amplitude (x, y, v on the 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 are surrounded is divided into (n+1) part, the pairing separately x axial coordinate of the n bar straight line x that timesharing such as record are used i
Step 6 is individually fixed in n sheet guide vane on the 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
Figure BDA0000137525930000021
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 said guide vane adopts the profile of aerofoil profile NPU-LS 0417.
Adopt method of the present invention to make effectively to go into the fluid of casing even along the flow velocity of all directions by channel flow.
Description of drawings
Fig. 1 is the mounting point schematic representation of guide vane among the embodiment;
Fig. 2 is to x-v among the embodiment XyThe area that curve and x axle are surrounded carries out the schematic representation as a result of five equilibrium;
Fig. 3 is that embodiment's installation guide vane velocity distribution preceding and that install on the guide vane rear semicircle p contrasts schematic representation.
Below in conjunction with embodiment and accompanying drawing the present invention is done further explain.
Embodiment
To go into the fluid of casing by channel flow even along the flow of all directions in order to make, and at pipeline and casing joint support is installed, specifically; This support or be installed on the pipeline or be installed on the casing is equipped with n sheet guide vane, and adopts following method step to confirm the mounting point of n sheet guide vane on support on this support; Wherein: n is the positive integer more than or equal to 2; Guide vane i is the guide vane in the 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; Specifically according to the diameter of pipeline and the length of casing; In gambit software, set up the model of pipeline and casing and the model of being set up is carried out grid dividing; The generating mesh file; Then this grid file is imported in the FLUENT fluid software for calculation, open the material properties of k-epsilon two equation models, definition fluid, pipeline and casing and boundary conditions is set, combine the SIMPLE algorithm simulation to go out the liquid speed field of casing and pipeline junction simultaneously;
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 the crossing cross section of pipeline 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 be that semicircle p is made in the center of circle with initial point o;
When fluid is gone into casing from channel flow; Flow rate of fluid has a sudden change at the interface place of pipeline and casing; Promptly begin to take place obvious variation in this interface place flow rate of fluid, the application the current-sharing that will realize, make fluid get into casing exactly from pipeline after; Flow on the same distance all directions in center of the interface of pipeline and casing is approaching; Since apart from the interface center equidistant same be on the hemisphere face of the centre of sphere with the interface center, so just will make the flow on all directions on the hemisphere face that with the interface center is the centre of sphere close, the mainstream speed when fluid is gone into casing by channel flow in addition is perpendicular to the interface of pipeline and casing; The mainstream speed direction that is fluid is in the xoy plane; And the size of mainstream speed is all bigger to flow effect than the speed of other any directions, so only need extract the velocity amplitude on xoy plane and the 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 diameter of pipeline and flow rate of fluid; The design pipeline the time, generally be utilization supposition flow velocity method, calculate the size of confirming pipeline through waterpower; That is to say between the size of flow rate of fluid and pipeline has certain corresponding relation, so mainly consider the size of pipeline and the relation of semicircle p radius when confirming semicircle p radius.In order to confirm 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 the different ratios of pipeline radius with the semicircle radius, the ratio of pipeline radius and semi-circular line radius is taken as 1,0.9,0.75,0.5,0.4,0.25 respectively; The speed numerical value that extracts is compared; Find that the pipeline radius and the ratio of semicircle radius are at 0.75 o'clock, the flow speed value nonuniformity maximum on the semicircle is so confirm as the radius of the semi-circular line of being studied 1.33 times of pipeline radius; So in system of coordinates M, cross point (1.33x 0, 0), (0,1.33x 0) and (1.33x 0, 0) and be that semicircle p is made in the center of circle with initial point o;
Step 4 in the liquid speed field of being simulated, is extracted velocity amplitude (x, y, v on the 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 are surrounded is divided into (n+1) part, the pairing separately x axial coordinate of the n bar straight line x that timesharing such as record are used i
In this step why to x-v XyThe area that curve and x axle are surrounded carry out five equilibrium be because: x-v XyIn the 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 the plotted curve and x axle are surrounded) consistent; Flow Q in each small channel that then can guarantee to be divided into by guide vane is consistent; Promptly guarantee to equate, reached the purpose of current-sharing, for guaranteeing x-v in each passage perpendicular to the flow in each runner of mainstream speed direction is intimate XyCurve in the plotted curve equates with the area that the x axle is surrounded, will be with x-v XyThe area that curve and x axle are surrounded carries out five equilibrium;
Step 6 is individually fixed in n sheet guide vane on the 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
Figure BDA0000137525930000041
x i∈ [1.33x 0, 1.33x 0], y i∈ [0,1.33x 0]; For guaranteeing x-v in each passage XyCurve in the plotted curve equates with the area that the x axle is surrounded, and the position of guide vane must be according to the location arrangements of dividing line in the step 5, so just can make a value of each passage consistent with setting value in the step 5; And for each guide vane, itself and the tie point of support, the central point of 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 said guide vane adopts the profile of aerofoil profile NPU-LS 0417.In order to reduce the barrier effect of guide vane shape convection cell as far as possible, the claimant combines 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 behind 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:
Pipeline 1 in the present embodiment is for the circular duct of φ 225, casing 3 are of a size of 4 * 3 * 5m, and ducted wind speed is 4m/s, uses five guide vanes 4, and the length of guide vane 4 center lines is 30mm.Defer to technique scheme, guide vane 4 positions that are installed on the support 1 are as shown in Figure 1.
The applicant adds before the current equalizer with afterwards the pipeline and the velocity field of casing junction embodiment and has carried out numerical simulation study; The result as shown in Figure 3; Through comparing; After adding the fluid current equalizer of pipeline and casing junction, fluid is obviously even than not adding before the current equalizer along the flow velocity of all directions.
Need to prove that related fluid is liquid or gas in the method for the present invention.

Claims (2)

1. method is confirmed in the mounting point of the guide vane of pipeline and casing joint, it is characterized in that, to go into the fluid of casing by channel flow even along the flow of all directions in order to make; At pipeline and casing joint support is installed, n sheet guide vane is installed on this support, and adopt following method step to confirm 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 the 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 the crossing cross section of pipeline 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 be that semicircle p is made in the center of circle with initial point o;
Step 4 in the liquid speed field of being simulated, is extracted velocity amplitude (x, y, v on the 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 are surrounded is divided into (n+1) part, the pairing separately x axial coordinate of the n bar straight line x that timesharing such as record are used i
Step 6 is individually fixed in n sheet guide vane on the 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
Figure FDA0000137525920000011
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. the fluid current equalizer of pipeline as claimed in claim 1 and casing joint is characterized in that, the edge shape of said guide vane adopts the profile of aerofoil profile NPU-LS 0417.
CN 201210040951 2012-02-22 2012-02-22 Mounting position confirming method for guide vanes at joint of pipeline and box Expired - Fee Related CN102536973B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
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
US20040247451A1 (en) * 2003-02-28 2004-12-09 Durward Robert Bonthron Method and apparatus for enhancing fluid velocities in pipelines
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
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
US20040247451A1 (en) * 2003-02-28 2004-12-09 Durward Robert Bonthron Method and apparatus for enhancing fluid velocities in pipelines
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 (1)

* Cited by examiner, † Cited by third party
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》 *

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