CN101963170B - Rectangular section cross type shunting rectification cross joint - Google Patents
Rectangular section cross type shunting rectification cross joint Download PDFInfo
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- CN101963170B CN101963170B CN2010105203042A CN201010520304A CN101963170B CN 101963170 B CN101963170 B CN 101963170B CN 2010105203042 A CN2010105203042 A CN 2010105203042A CN 201010520304 A CN201010520304 A CN 201010520304A CN 101963170 B CN101963170 B CN 101963170B
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Abstract
The invention discloses a cross type shunting rectification cross joint, which comprises an inlet section, a first outlet section, a second outlet section and a third outlet section, wherein the first outlet section is positioned on one side of the inlet section and on the same horizontal plane as the inlet section; the second outlet section and the third outlet section are symmetrically positioned on upper side and lower side of the inlet section, and the plane on which the connection of extension lines of the second outlet section and the third outlet section is and the plane on which the inlet section is are vertical to each other to form a cross type structure; the inlet section is connected with the first outlet section through a horizontal connection end of a four-way shunting section; two longitudinal connection ends of the four-way shunting section are symmetrically connected with a buffer section; the other end of the buffer section is symmetrically provided with a rectification section which is connected with the second outlet section and the third outlet section; and the upper end in the rectification section is provided with rectification vanes, and each rectification vane is provided with guide vanes which divide the interior of the rectification section into five equal-flow fluid passages. The unique design of the cross type shunting rectification cross joint eliminates velocity stratification formed after fluid passing through the cross type cross joint, thereby finally fulfilling the aim of rectifying the fluid passing through the cross type cross joint.
Description
Technical field
The present invention relates to a kind of local member in a kind of ventilation and air conditioning system, the cross shunting rectification of particularly a kind of rectangular cross section four-way.
Background technique
Cross four-way pipe is the change direction of flow very common in the HVAC motive fluid machinery and the pipe fitting of shunting.In hydrokinetics; 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 arced surface and the pressure reduction of intrados.So flow rate of fluid will reduce at the outer arced surface place, and flow rate of fluid correspondingly increases at the intrados place.Therefore, diffusion effect near outer arced surface, occurs, and blockage effect occurring near the intrados 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, promptly produces diffusion effect near the intrados, produce blockage effect near the outer arced surface.Diffusion effect makes fluid break away from wall, and the bending tube section fluid has been owing to the motion that inertia flows to outer arced surface has more aggravated the separation from intrados simultaneously, and produces strong momentum transfer.
Owing to above reason, fluid is after flowing through cross four-way shunting, and fluid can be because diffusion produces the liquid speed layering with blockage effect, and is as shown in Figure 1, and the flow velocity on branch road right side was greater than the left side about this can cause after the fluid shunting shown in the figure.This just means that rate of flow of fluid is inhomogeneous, at field of heating ventilation air conditioning, can vibration take place and produce noise at pipe interior on the one hand; On the other hand, if this part fluid is directly sent into the room, influence indoor comfort thereby can cause indoor air flow tissue and design to run counter to.
Summary of the invention
The object of the present invention is to provide a kind of cross shunting rectification four-way; This cross shunting rectification four-way according to its structure adopt unique design eliminated fluid through cross four-way after formed speed layering, thereby finally reach carry out the purpose of rectification through the fluid behind the cross four-way.
In order to realize above-mentioned technical assignment, the present invention adopts following technological scheme to be achieved:
The cross shunting rectification of a kind of rectangular cross section four-way; Comprise entrance, first outlet section, second outlet section, the 3rd outlet section; Wherein first outlet section is positioned at entrance one side and entrance is in same horizontal plane; Second outlet section and the 3rd outlet section symmetry are positioned at entrance both sides up and down; And link to each other with the elongation line of the 3rd outlet section plane, plane and entrance place at place of second outlet section is vertical each other, constitutes cross structure, and the horizontal connecting end that entrance passes through the four-way shunting section links to each other with first outlet section; Vertical two connecting ends of four-way shunting section are symmetrically connected with an end of breeze way, are arranged with the rectification section that links to each other with the 3rd outlet section with second outlet section at the breeze way the other end; Upstream extremity is provided with straightener(stator) blade in the described rectification section, has guide vane on each straightener(stator) blade with being divided into five fluid passages of waiting flow in the rectification section.
Other technologies characteristics of the present invention are:
Said breeze way length is identical with the entrance channel width.
It vertically is acute triangle to described straightener(stator) blade 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.
In addition, design the inlet size of five fluid passages that form between interior each straightener(stator) blade of the cross shunting rectification of above-mentioned rectangular cross section four-way rectification section and the rectification section longitudinal direction and confirm method, this method comprises the steps:
Step 1, confirm the fluid flow fields state in the cross shunting four-way; Size and entrance liquid speed according to first outlet section, second outlet section and the 3rd outlet section pipeline; The operation reynolds stress model also combines the SIMPLE algorithm; Simulate then traditional font shunting four-way velocity field before the rectification section is set, thereby obtain the velocity distribution value of rectification section position fluid.
The inlet size of step 2, five fluid passages confirming to form between cross each straightener(stator) blade of shunting rectification four-way and the rectification section longitudinal direction; The velocity distribution value of the rectification section 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.
By above visible; The present invention at first shunts through the shunting section convection cell; Fluid is got in the breeze way; Fluid cushions in breeze way, and formation waits the flow cutting through five passage convection cells that vary in size that form between straightener(stator) blade and the rectification section after having metastable fluid characteristics again, and through forming the transverse velocity of five equal and opposite in direction passage eliminate fluids between guide vane and the housing.Thereby eliminate fluid finally reaches the purpose of carrying out rectification to through the fluid behind the cross four-way through formed speed layering behind the cross four-way, and is as shown in Figure 2.
Description of drawings
Fig. 1 is the flow velocity isoline map during through traditional cross four-way for fluid;
Fig. 2 installs the flow velocity isoline map when fluid is through the cross four-way behind the cross shunting rectification four-way of the present invention;
Fig. 3 is a structural representation of the present invention;
Fig. 4 is the velocity distribution integrogram of traditional cross four-way outlet section transverse section fluid;
Fig. 5 is the cross shunting four-way outlet section velocity contour of the embodiment of the invention
The following information of each symbolic representation among the figure: 1, entrance; 2,3,4,5, straightener(stator) blade; 6, guide vane; 7, second outlet section; 8, breeze way; 9, four-way shunting section; 10, first outlet section, 11, rectification section; 12 the 3rd outlet 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; The cross shunting rectification of rectangular cross section of the present invention four-way; Comprise entrance 1, first outlet section 10, second outlet section 7, the 3rd outlet section 12; Wherein first outlet section 10 is positioned at entrance 1 one sides and entrance 1 is in same horizontal plane, and second outlet section 7 and the 3rd outlet section 12 symmetries are positioned at entrance about in the of 1 both sides, and link to each other with the elongation line of the 3rd outlet section 12 plane and the plane, entrance 1 place at place of second outlet section 7 is perpendicular; Constitute cross structure; It is characterized in that: entrance 1 links to each other with first outlet section 10 through the horizontal connecting end of four-way shunting section 9, and vertical two connecting ends of four-way shunting section 9 are symmetrically connected with an end of breeze way 8, and being designed for of breeze way 8 guarantees to form in the three-way pipe of whole interflow the fluid with metastable fluid characteristics here.Be arranged with the rectification section 11 that links to each other with the 3rd outlet section 12 with second outlet section 7 at breeze way 8 the other ends; Upstream extremity is provided with straightener(stator) blade (2,3,4,5) in the described rectification section 11, has guide vane 6 on each straightener(stator) blade with being divided into five fluid passages of waiting flow in the rectification section 11.
Because fluid is becoming unstable through flow characteristic after the break-in; For after it can being formed have metastable fluid characteristics; And then waiting flow cutting through five fluid passage convection cells that vary in size that form between straightener(stator) blade and the rectification section, the present invention is provided with the length breeze way 3 identical with entrance 1 channel width before rectification section 11.
The problem that the resistance that causes for fear of cutting fluid increases; And more effectively convection cell cuts; Straightener(stator) blade (2,3,4,5) is provided with certain inclination angle along rectification section 11 its longitudinal directions, makes to form five fluid passages that inlet varies in size in the rectification section 11; Described straightener(stator) blade (2,3,4,5) be acute triangle and with come flow path direction relative.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 resistance that causes for fear of cutting fluid equally increases, and can carry out water conservancy diversion by effective more fluid to the straightener(stator) blade of flowing through, guide vane 6 comes flow path direction to be acute triangle dorsad, and vertically is parallel to each other with rectification section 11.After fluid is through four-way shunting section 9 formed with come the perpendicular velocity component of flow path direction to be eliminated by guide vane 6, thereby eliminated that fluid forms vortexs through four-way shunting section 9 backs and increase resistance maybe.
Owing to expansion and the contraction described in the background technique, 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 the cross four-way.The present invention through reynolds stress model and combine that the SIMPLE algorithm drawn flow through the cross four-way after rate of flow of fluid distribute and size; Confirm the spacing size between straightener(stator) blade and the housing, 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 in transverse 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 in the layering of the speed of elimination.
Therefore design the definite method of inlet size of five fluid passages that each straightener(stator) blade (2,3,4,5) and rectification section 11 in the cross shunting rectification four-way rectification section 11 form between vertically, it is characterized in that this method comprises the steps:
Step 1, confirm the fluid flow fields state in the cross shunting four-way, get size and entrance liquid speed, adopt reynolds stress model also to combine the SIMPLE algorithm according to first outlet section 10, second outlet section 7 and the 3rd outlet section 12 pipelines.
At first, find the solution momentum equation:
Find the solution pressure modified continuous property equation then:
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 representes 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.The RSM 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 |
Simulate then cross shunting rectification four-way velocity field before the rectification section 11 is set, thereby obtain the velocity distribution of rectification section 11 position fluids, referring to Fig. 4.
The inlet size of step 2, five fluid passages confirming to form between cross each straightener(stator) blade of shunting rectification four-way (2,3,4,5) and rectification section 11 longitudinal directions, the velocity distribution of the rectification section 11 position fluids of trying to achieve according to step 1, as shown in Figure 4.Obtain the velocity magnitude of each point in the cross section, position of rectification section 11; From left to right the distance of flow velocity and fluid and rectification section inwall is carried out integration; When flow satisfy total discharge 1/5 the time stop integration, the distance of being tried to achieve is the spacing that is provided with between distance and each straightener(stator) blade that is provided with of straightener(stator) blade and rectification section 10 inwalls.So just satisfy these five fluid passage inner fluid flows and all be identical 1/5 of the total discharge that is all.Utilize area branch principle, thereby accomplish the setting of the size of five fluid passages inlets when satisfying each fluid passage inner fluid flow the same terms.
Specific embodiment:
Below provide specific embodiment of the present invention, need to prove that the present invention is not limited to following specific embodiment, all equivalents of on present techniques scheme basis, doing all fall into protection scope of the present invention.
Follow technique scheme, connect with the central air-conditioner airduct and use the optimizing process of cross shunting rectification four-way to be example, at first confirm cross shunting rectification four-way pipeline each several part size; Wherein the rectification entrance is of a size of 300mm * 300mm, and first outlet section is of a size of 600mm * 300mm, and second and third outlet section size is 300mm * 300mm; Camber is 1.5; Rectification section length is 300mm, and the commutator lug 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 value of place, rectification section 11 positions fluid when never adding rectification section.Confirm rectification section ingress size, as shown in Figure 4, according to integral principle, the area that the curve among Fig. 4 surrounded and big or small for flow 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.Therefore, 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.Through calculating when width reaches 80mm, 40mm, 50mm, 60mm, 70mm respectively successively from left to right, 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.Through 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 each exit velocity of the present invention and traditional cross shunting rectification four-way distributes, introduce the notion of variance here it is carried out the analysis of flow speed stability property.
The speed variance of the present invention and traditional cross shunting rectification four-way compares, and pipeline transverse section, traditional cross shunting rectification four-way outlet port speed variance is 0.593803, and pipeline transverse section, outlet port of the present invention speed variance is 0.107068.Its velocity-stabilization degree carries 82.0%.
Meanwhile, through arrangement the present invention and traditional cross shunting rectification four-way transverse section velocity distribution value, as shown in Figure 5.The velocity distribution in outlet port of the present invention is obviously more even than traditional bend pipe, has so not only avoided tube fluid because of the uneven vibrating noise that causes of velocity flow profile but also can make the steady air current that gets into air-conditioned room, improves the comfort level of living space.
Claims (5)
1. the cross shunting rectification of rectangular cross section four-way; Comprise entrance (1), first outlet section (10), second outlet section (7), the 3rd outlet section (12); Wherein first outlet section (10) is positioned at entrance (1) one side and entrance (1) is in same horizontal plane; Second outlet section (7) is positioned at entrance (1) both sides up and down with the 3rd outlet section (12) symmetry; And second outlet section (7) links to each other with the elongation line of the 3rd outlet section (12), and to belong to the plane vertical each other for plane and the entrance (1) at place; Constitute cross structure; It is characterized in that: entrance (1) links to each other with first outlet section (10) through the horizontal connecting end of four-way shunting section (9), and vertical two connecting ends of four-way shunting section (9) are symmetrically connected with an end of breeze way (8), are arranged with the rectification section (11) that links to each other with the 3rd outlet section (12) with second outlet section (7) at breeze way (8) the other end; The interior upstream extremity of described rectification section (11) is provided with straightener(stator) blade (2,3,4,5), has guide vane (6) on each straightener(stator) blade with being divided into five fluid passages of waiting flow in the rectification section (11).
2. the cross shunting rectification of rectangular cross section according to claim 1 four-way is characterized in that: breeze way (8) length is identical with entrance (1) channel width.
3. the cross shunting rectification of rectangular cross section according to claim 1 four-way; It is characterized in that: it vertically is acute triangle to described straightener(stator) blade (2,3,4,5) along rectification section (11); 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 (11).
4. the cross shunting rectification of rectangular cross section according to claim 1 four-way, it is characterized in that: described guide vane (6) comes flow path direction to be acute triangle dorsad, and vertically is parallel to each other with rectification section (11).
5. the method for the inlet of five fluid passages that form between each straightener(stator) blade (2,3,4,5) and rectification section (11) longitudinal direction in the design described rectangular cross section of the claim 1 cross shunting rectification four-way rectification section (11); It is characterized in that this method comprises the steps:
Step 1, confirm the fluid flow fields state in the cross shunting four-way of rectangular cross section: according to first outlet section (10), second outlet section (7) and the 3rd outlet section (12) line size and entrance liquid speed; The operation reynolds stress model also combines the SIMPLE algorithm; Simulate then rectification section (11) the cross shunting four-way of rectangular cross section velocity field before is set, thereby obtain the velocity distribution value of rectification section (11) position fluid;
The inlet size of step 2, five fluid passages confirming to form between each straightener(stator) blade of the cross shunting rectification of rectangular cross section four-way (2,3,4,5) and rectification section (11) longitudinal direction: the velocity distribution value of rectification section (11) 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 |
|---|---|---|---|
| CN2010105203042A CN101963170B (en) | 2010-10-26 | 2010-10-26 | Rectangular section cross type shunting rectification cross joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105203042A CN101963170B (en) | 2010-10-26 | 2010-10-26 | Rectangular section cross type shunting rectification cross joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101963170A CN101963170A (en) | 2011-02-02 |
| CN101963170B true CN101963170B (en) | 2012-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105203042A Expired - Fee Related CN101963170B (en) | 2010-10-26 | 2010-10-26 | Rectangular section cross type shunting rectification cross joint |
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| CN (1) | CN101963170B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106885083A (en) * | 2017-04-11 | 2017-06-23 | 武汉海博瑞科技有限公司 | A kind of vibration-damping noise-reduction type pipe fitting and its manufacture method |
Family Cites Families (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 |
| EP0667460B1 (en) * | 1994-02-10 | 2001-04-18 | Michihiko Kawano | Elbow provided with guide vanes |
| US5529084A (en) * | 1994-03-24 | 1996-06-25 | Koch Engineering Company, Inc. | Laminar flow elbow system and method |
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