CN101963169A - 90-degree rectification rectangular bent pipe - Google Patents
90-degree rectification rectangular bent pipe Download PDFInfo
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- CN101963169A CN101963169A CN201010520174.2A CN201010520174A CN101963169A CN 101963169 A CN101963169 A CN 101963169A CN 201010520174 A CN201010520174 A CN 201010520174A CN 101963169 A CN101963169 A CN 101963169A
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- rectification
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Abstract
The invention discloses a 90-degree rectification rectangular bent pipe comprising an inlet section, a 90-degree bent turning section and an outlet section, wherein one end of the inlet section is connected with one end of the 90-degree bent turning section, and the other end of the 90-degree bent turning section is connected with a buffer section; a rectification section connected with the outlet section is arranged below the buffer section; an upper end in the rectification section is provided with rectification vanes; and each rectification vane is provided with a fluid vane which divides the rectification section into five fluid paths with equal flow. The peculiar design of the 90-degree rectification bent pipe eliminates speed stratification formed after fluid flows through the 90-degree rectangular bent pipe so as to realize the purpose of rectifying the fluid which flows through the 90-degree rectangular bent pipe.
Description
Technical field
The present invention relates to the local member in a kind of ventilation and air conditioning system, particularly a kind of 90 ° of rectification rectangular bend.
Background technique
90 ° of rectangular bend are the pipe fittings of change direction of flow very common in the HVAC motive fluid machinery, in fluid delivery pipeline, because the turning of fluid, occurred from the centrifugal force of centre of curvature to the pipe outer arced surface, this with regard to make fluid from the straightway of pipeline carry out the transition to bending tube section (turn round finish before) time, the increased pressure of outer diameter and arc surface and the pressure reduction of interior diameter and arc surface.So diameter and arc surface place flow rate of fluid will reduce outside, and correspondingly increase in interior diameter and arc surface place flow rate of fluid.Therefore, diffusion effect appears in the diameter and arc surface annex outside, and blockage effect occurring near interior diameter and arc surface place.When fluid carries out the transition to straight length (back of turning round) from bending tube section, there is opposite phenomenon to take place again, produces diffusion effect near the promptly interior diameter and arc surface, produce blockage effect near the outer diameter and arc surface.Diffusion effect makes fluid break away from wall, and the bending tube section fluid motion that flows to outer diameter and arc surface owing to inertia has simultaneously more aggravated the separation from interior diameter and arc surface.
Owing to above reason, fluid is after flowing through 90 ° of rectangular bend, and fluid can be because diffusion and blockage effect and layering, and as shown in Figure 1, this flow velocity that can cause fluid right side shown in the figure is greater than the left side.This just means that rate of flow of fluid is inhomogeneous.At field of heating ventilation air conditioning, if this part fluid is directly sent into the room, will influence indoor air flow and distribute, make indoor actual travelling comfort not meet design requirement, thereby influence indoor hot comfort.
Summary of the invention
The purpose of this invention is to provide a kind of 90 ° of rectification rectangular bend, the unique design of these 90 ° of rectification rectangular bend has been eliminated fluid by formed speed layering after 90 ° of rectangular bend, thereby finally reaches the purpose of carrying out rectification to by the fluid after 90 ° of rectangular bend.
To achieve these goals, the present invention adopts following technological scheme to be achieved:
A kind of 90 ° of rectification rectangular bend, comprise entrance, 90 ° of crooked break-in sections and outlet section, entrance one end links to each other with 90 ° of crooked break-in Duan Yiduan, and 90 ° of crooked break-in section the other ends are connected with breeze way, are provided with the rectification section that links to each other with outlet section below breeze way; The upper end is provided with straightener(stator) blade in the described rectification section, has guide vane on each straightener(stator) blade and will be divided into five fluid passages of waiting flow in the rectification section.
Other technologies characteristics of the present invention are:
Described breeze way length is identical with the channel width of entrance.
Described straightener(stator) blade vertically is acute triangle along rectification section, and with coming flow path direction certain inclination angle is arranged, and makes to form five fluid passages that inlet varies in size in the rectification section.
Described guide vane comes flow path direction to be acute triangle dorsad, and vertically is parallel to each other with rectification section.
A kind of inlet size that designs five fluid passages that form between interior each straightener(stator) blade of above-mentioned 90 ° of rectification rectangular bend rectification sections and the rectification section longitudinal direction is determined method, and this method comprises the steps:
Fluid flow fields state in step 1,90 ° of rectangular bend of definite tradition, according to entrance and 90 ° of crooked break-in segment pipe sizes and entrance liquid speed, adopt reynolds stress model and in conjunction with the SIMPLE algorithm, simulation is provided with rectification section 90 ° of interior velocity fields of rectangular bend before then, thereby obtains the velocity distribution value of rectification section position fluid;
As seen from the above, the present invention at first changes fluid flow direction by 90 ° of curved break-in sections, fluid is entered in the breeze way, fluid cushions in breeze way, formation waits the flow cutting by five fluid passage convection cells that vary in size that form between straightener(stator) blade and rectification section inwall and the commutator lug after having metastable fluid characteristics again, and by forming the transverse velocity of five equal-volume fluid passage eliminate fluids between guide vane and the rectification section.Thereby eliminate fluid finally reaches the purpose of carrying out rectification to by the fluid after 90 ° of rectangular bend, as shown in Figure 2 by formed speed layering after 90 ° of rectangular bend.
Description of drawings
Flow velocity isoline map when Fig. 1 passes through 90 ° of rectangular bend of tradition for fluid;
Fig. 2 is the flow velocity isoline map when fluid is by bend pipe after installation 90 ° of rectification rectangular bend of the present invention;
Fig. 3 is a structural representation of the present invention;
Fig. 4 is the velocity distribution integrogram of traditional winding pipe exit section transverse section fluid;
Fig. 5 is 90 ° of rectification rectangular bend of embodiment of the invention pipe outlet section velocity contour;
The following information of each symbolic representation among the figure: 1, entrance; 2,90 ° of crooked break-in sections; 3, breeze way; 4,5, straightener(stator) blade; 7, outlet section; 8,9 straightener(stator) blades; 10 rectification sections, other, the direction of arrow is represented fluid flow direction.
Below in conjunction with accompanying drawing particular content of the present invention is done explanation in further detail.
Embodiment
As shown in Figure 3, a kind of 90 ° of rectification rectangular bend, comprise 1,90 ° of crooked break-in sections 2 of entrance and outlet section 7, entrance 1 one ends link to each other with 90 ° of crooked break-in section 2 one ends, 90 ° of crooked break-in section 2 the other ends are connected with breeze way 3, and being designed for of breeze way 3 guarantees to form in whole 90 ° of rectification rectangular bend the fluid with metastable fluid characteristics herein.Below breeze way 3, be provided with the rectification section 10 that links to each other with outlet section 7; The upper end is provided with straightener(stator) blade (4,5,6,9) in the described rectification section 10, has guide vane 8 on each straightener(stator) blade and will be divided into five fluid passages of waiting flow in the rectification section 10.Thereby realize the fluid in whole 90 ° of rectification rectangular bend pipelines is waited the flow cutting.
Because fluid is becoming unstable through flow characteristic after the break-in, after making its elder generation's formation have metastable fluid characteristics, wait the flow cutting by five fluid passage convection cells that vary in size that form between straightener(stator) blade (4,5,8,9) and the rectification section 10 then, the present invention is provided with the length breeze way 3 identical with entrance 1 channel width before rectification section 10.
The problem that the resistance that causes for fear of cutting fluid increases, and more effectively convection cell cuts, described straightener(stator) blade (4,5,6,9) vertically is acute triangle along rectification section 10, and with coming flow path direction certain inclination angle is arranged, make to form five fluid passages that inlet varies in size in the rectification section 10.Surface of contact area when this type guide vane and fluid collision is littler, and the resistance to impact that has this to produce is also little, because the possibility of collision generation fluid swirling is also little.Can effectively reduce the caused resistance of cutting fluid with this.
The problem that the same resistance that causes for fear of cutting fluid increases, and can carry out water conservancy diversion by effective more fluid to the straightener(stator) blade of flowing through, described guide vane 8 comes flow path direction to be acute triangle dorsad, and vertically is parallel to each other with rectification section 10.Formedly after fluid is by crooked break-in section 2 can eliminate by diversed blade 8, thereby eliminated the possibility that fluid forms vortexs by crooked break-in section 2 backs and increases resistance with coming the perpendicular velocity component of flow path direction.
Because described expansion of background technique and contraction, it is big to form right side speed in position as shown in Figure 1, the speed layering that left side speed is little after fluid flows through 90 ° of rectangular bend.The present invention adopts reynolds stress model and rate of flow of fluid distributes and size after 90 ° of rectangular bend in conjunction with flowing through of being drawn of SIMPLE algorithm, determine the spacing size between straightener(stator) blade and the rectification section inwall, the fluid flow at each passage that makes fluid flow through behind the straightener(stator) blade is identical.Because the straightener(stator) blade convection cell cuts, fluid can be cut back formation vortex.Commutator lug among the present invention is under the big or small constant situation of cross section, and the transverse velocity of convection cell is offset, thereby eliminates its formed vortex, makes fluid only have longitudinal velocity.Thereby, reach the rectification purpose, as shown in Figure 2 in the layering of the speed of elimination.
Therefore the present invention designs the definite method of inlet size of five fluid passages that form between 90 ° of rectification rectangular bend rectification sections, 10 interior each straightener(stator) blade (4,5,6,9) and rectification section 10 longitudinal directions, and this method comprises the steps:
Step 1, determine the fluid flow fields state in 90 ° of rectangular bend,, adopt reynolds stress model and in conjunction with the SIMPLE algorithm according to entrance 1 and 90 ° of crooked break-in section 2 line sizes and entrance liquid speed:
At first, find the solution momentum equation:
Find the solution pressure modified continuous equation then:
Wherein ρ is a fluid density; u
i, u
jBe speed, i, j are the tensor subscript, i, j=1,2,3; μ, μ
tBe dynamic viscosity, subscript t represents that this physical quantity is caused by the turbulent flow pulsation; σ
k, σ
τBe constant; C
μ, C
1, C
2Be empirical coefficient, its value is as shown in the table.
And upgrade pressure, just face mass flow rate and find the solution the Reynolds stress equation with this.And judge whether convergence, if convergence then stop to calculate, if would not do not restrain then continue to find the solution momentum equation.RSM (reynolds stress model) model constants, as shown in table 1:
Table 1. model constants
| Coefficient | C μ | C 1 | C 2 | σ k | σ ε |
| Numerical value | 0.09 | 1.44 | 1.92 | 1.0 | 1.3 |
Simulation is provided with rectification section 10 90 ° of interior velocity fields of rectangular bend before then, thereby obtains the velocity distribution value of rectification section 10 position fluids;
Specific embodiment:
Below provide specific embodiments of the invention, need to prove that the present invention is not limited to following specific embodiment, all equivalents of doing on present techniques scheme basis all fall into protection scope of the present invention.
Defer to technique scheme, the optimizing process that connects 90 ° of rectangular bend with the central air-conditioner airduct is an example, at first determine 90 ° of rectangular bend pipeline each several part sizes, wherein entrance 1 is of a size of 300mm * 300mm, outlet section 7 is of a size of 300mm * 300mm, camber is 1.5, the length of rectification section 10 is 300mm, straightener(stator) blade length in the rectification section is 100mm, guide vane length 300mm, list the discrete scheme of momentum equation and equation of continuity then, use the simple method to find the solution, can draw the velocity distribution of place, rectification section 10 positions fluid when never adding rectification section.Next determine rectification section ingress size, as shown in Figure 4, according to integral principle, the area that the curve among Fig. 4 surrounded reaches and is the flow size, is that 7m/s is an example with the ingress wind speed, and total inlet mentions that flow is 7m/s * 300mm * 300mm=0.63m
3/ s.The present invention is altogether five runners, and then the fluid volume that flows through of each runner planted agent is 0.126m
3/ s.So as long as the left end from Fig. 4 carries out integration along channel width successively to right-hand member, integration stops to get final product when integral value reaches 0.126m3/s.By calculating when width reaches 80mm, 40mm, 50mm, 60mm, 70mm respectively from left to right successively, the volume flowrate integral value in its each runner is all 0.126m
3/ s (at this moment, the mean velocity in five runners is followed successively by 5.25m/s, 10.5m/s, 8.4m/s, 7m/s, 6m/s).The size that so just can determine ingress, five fluid passages is respectively 80mm * 300mm, 40mm * 300mm, 50mm * 300mm, 60mm * 300mm, 70mm * 300mm from left to right.By this fluid cutting, fluid flow in five fluid passages equates, so fluid passage outlet size also equates, its fluid passage outlet size is followed successively by 60mm * 300mm, 60mm * 300mm, 60mm * 300mm, 60mm * 300mm, 60mm * 300mm (at this moment, the mean velocity in five runners is 7m/s) from left to right.
In theory of probability and mathematical statistics, variance (English Variance) is used for measuring the departure degree between stochastic variable and its mathematical expectation (being average).In many practical problems, the departure degree between research stochastic variable and the average has very important meaning.
Therefore, in order to analyze different that 90 ° of rectangular bend exit velocities of the present invention and tradition distribute, introduce the concept of variance here it is carried out the flow speed stability analysis.
The present invention compares with the speed variance of 90 ° of rectangular bend of tradition, and pipeline cross section, 90 ° of rectangular bend exits of tradition speed variance is 1.535657, and exit of the present invention conduit section speed variance is 0.12077. Its velocity-stabilization degree has improved 92.1%.
Meanwhile, by 90 ° of rectangular bend cross section VELOCITY DISTRIBUTION values of arrangement the present invention and tradition, as shown in Figure 5, the VELOCITY DISTRIBUTION in exit of the present invention is obviously more even than traditional bend pipe, so not only avoid tube fluid because of the uneven vibrating noise that causes of velocity flow profile but also can make the steady air current that enters air-conditioned room, improved the comfort level of living space.
Claims (5)
1. 90 ° of rectification rectangular bend, comprise entrance (1), 90 ° of crooked break-in sections (2) and outlet section (7), it is characterized in that: entrance (1) one end links to each other with 90 ° of crooked break-in section (2) one ends, 90 ° of crooked break-in sections (2) the other end is connected with breeze way (3), is provided with the rectification section (10) that links to each other with outlet section (7) in breeze way (3) below; The upper end is provided with straightener(stator) blade (4,5,6,9) in the described rectification section (10), has guide vane (8) on each straightener(stator) blade and will be divided into five fluid passages of waiting flow in the rectification section (10).
2. 90 ° of rectification rectangular bend according to claim 1 is characterized in that: breeze way (3) length is identical with the channel width of entrance (1).
3. 90 ° of rectification rectangular bend according to claim 1, it is characterized in that: described straightener(stator) blade (4,5,6,9) vertically is acute triangle along rectification section (10), and with coming flow path direction certain inclination angle is arranged, make to form five fluid passages that inlet varies in size in the rectification section (10).
4. 90 ° of rectification rectangular bend according to claim 1 is characterized in that: described guide vane (8) comes flow path direction to be acute triangle dorsad, and vertically is parallel to each other with rectification section (10).
In the design 90 ° of rectification rectangular bend rectification sections (10) each straightener(stator) blade (4,5,6,9) and rectification section (10) vertically between the method for inlet of five fluid passages of formation, it is characterized in that this method comprises the steps:
Step 1, determine the fluid flow fields state in 90 ° of rectangular bend: according to entrance (1) and 90 ° of crooked break-in section (2) line sizes and entrance liquid speed, adopt reynolds stress model and in conjunction with the SIMPLE algorithm, simulate then velocity field in the preceding 90 ° of rectangular bend of rectification section (10) is set, thereby obtain the velocity distribution value of rectification section (10) position fluid;
Step 2, determine the inlet size of five fluid passages forming between 90 ° of each straightener(stator) blades of rectification rectangular bend (4,5,6,9) and rectification section (10) are vertically: the velocity distribution value of rectification section (10) the position fluid of trying to achieve according to step 1, utilize area branch principle, try to achieve five fluid passages inlet sizes when satisfying each fluid passage inner fluid flow the same terms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105201742A CN101963169B (en) | 2010-10-26 | 2010-10-26 | 90-degree rectification rectangular bent pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105201742A CN101963169B (en) | 2010-10-26 | 2010-10-26 | 90-degree rectification rectangular bent pipe |
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| Publication Number | Publication Date |
|---|---|
| CN101963169A true CN101963169A (en) | 2011-02-02 |
| CN101963169B CN101963169B (en) | 2012-02-01 |
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ID=43516183
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105201742A Expired - Fee Related CN101963169B (en) | 2010-10-26 | 2010-10-26 | 90-degree rectification rectangular bent pipe |
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| Country | Link |
|---|---|
| CN (1) | CN101963169B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108507408A (en) * | 2018-05-24 | 2018-09-07 | 靖江市华东船舶机械制造有限公司 | A kind of law enforcement water cannon peculiar to vessel |
| CN110594245A (en) * | 2019-08-27 | 2019-12-20 | 西安建筑科技大学 | Vortex ventilation device for limited space |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1557612A (en) * | 1976-10-04 | 1979-12-12 | Hargreaves & Sons Ltd Henry | Air turning assemblies for ducting |
| US5197509A (en) * | 1990-06-06 | 1993-03-30 | Cheng Dah Y | Laminar flow elbow system and method |
| CN2189230Y (en) * | 1994-02-07 | 1995-02-08 | 王文芳 | Device for guiding and adjusting air flow of electric fan |
| CN1112995A (en) * | 1994-02-10 | 1995-12-06 | 川野通彦 | Elbow provided with guide vanes |
| US5529084A (en) * | 1994-03-24 | 1996-06-25 | Koch Engineering Company, Inc. | Laminar flow elbow system and method |
-
2010
- 2010-10-26 CN CN2010105201742A patent/CN101963169B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1557612A (en) * | 1976-10-04 | 1979-12-12 | Hargreaves & Sons Ltd Henry | Air turning assemblies for ducting |
| US5197509A (en) * | 1990-06-06 | 1993-03-30 | Cheng Dah Y | Laminar flow elbow system and method |
| CN2189230Y (en) * | 1994-02-07 | 1995-02-08 | 王文芳 | Device for guiding and adjusting air flow of electric fan |
| CN1112995A (en) * | 1994-02-10 | 1995-12-06 | 川野通彦 | Elbow provided with guide vanes |
| US5529084A (en) * | 1994-03-24 | 1996-06-25 | Koch Engineering Company, Inc. | Laminar flow elbow system and method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108507408A (en) * | 2018-05-24 | 2018-09-07 | 靖江市华东船舶机械制造有限公司 | A kind of law enforcement water cannon peculiar to vessel |
| CN110594245A (en) * | 2019-08-27 | 2019-12-20 | 西安建筑科技大学 | Vortex ventilation device for limited space |
| CN110594245B (en) * | 2019-08-27 | 2024-05-03 | 西安建筑科技大学 | Vortex ventilation device for limited space |
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| Publication number | Publication date |
|---|---|
| CN101963169B (en) | 2012-02-01 |
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