CN101975205A - Rectangular section Z-shaped rectifier bent pipe - Google Patents
Rectangular section Z-shaped rectifier bent pipe Download PDFInfo
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- CN101975205A CN101975205A CN 201010520267 CN201010520267A CN101975205A CN 101975205 A CN101975205 A CN 101975205A CN 201010520267 CN201010520267 CN 201010520267 CN 201010520267 A CN201010520267 A CN 201010520267A CN 101975205 A CN101975205 A CN 101975205A
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Abstract
The invention discloses a rectangular section Z-shaped rectifier bent pipe. The rectangular section Z-shaped rectifier bent pipe comprises an inlet section, a Z-shaped deflecting section and an outlet section, wherein one end of the inlet section is connected with one end of the Z-shaped deflecting section; the other end of the Z-shaped deflecting section is connected with a buffer section; a rectifier section connected with the outlet section is arranged on one side of the buffer section; rectifier vanes are arranged at the inner upper end of the rectifier section; and each rectifier vane is provided with a guide vane which divides the rectifier section into five fluid channels with equal flow. Speed stratification formed by the fluid flowing through the Z-shaped rectangular bent pipe is eliminated through the unique design of the rectangular section Z-shaped rectifier bent pipe, so that the aim of rectifying the fluid flowing through the Z-shaped rectangular bent pipe is fulfilled finally.
Description
Technical field
The present invention relates to the local member in a kind of ventilation and air conditioning system, particularly a kind of rectangular cross section Z type rectification bend pipe.
Background technique
Rectangular cross section Z type bend pipe is the connection pipe fitting of change direction of flow extremely common in the HVAC motive fluid machinery, in the Z type bend pipe, because fluid is through twice turning, the velocity flow profile of the velocity flow profile merchandiser of break-in for the first time 90 ° of bend pipes is identical in the bend pipe: in the break-in for the first time, the inboard skew of mind-set bend pipe in the fluid turbulence, the place reaches the speed maximum value at the inboard near wall of bend pipe; In second bend pipe distance before, turbulent core is near wall place, the bend pipe outside after first bend pipe; Velocity flow profile is roughly the same with first bend pipe trend in second bend pipe and the downstream pipeline section thereof, but strong exchange has taken place for the insides of pipes fluid in second bend pipe and the momentum of outer side liquid.
Owing to above reason, fluid is after flowing through rectangular cross section Z type bend pipe, and fluid is owing to carry out strong momentum transfer in through twice break-in in pipe, and as shown in Figure 1, this can cause fluid rate of flow of fluid skewness shown in the figure.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 novel rectangular section Z type rectification bend pipe, the unique design of this rectangular cross section Z type rectification bend pipe has been eliminated fluid by formed speed layering behind the traditional rectangular section Z type bend pipe, thereby finally reaches the purpose of carrying out rectification to by the fluid behind the rectangular cross section Z type bend pipe.
In order to realize above-mentioned technical assignment, the objective of the invention is to adopt following technological scheme to be achieved:
A kind of rectangular cross section Z type rectification bend pipe comprises entrance, Z type break-in section and outlet section, and entrance one end links to each other with Z type break-in Duan Yiduan, and the Z type break-in section the other end connects breeze way, is provided with the rectification section that links to each other with outlet section in breeze way one side; 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 of the present invention are characterized as:
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.Guide vane comes flow path direction to be acute triangle dorsad, and vertically is parallel to each other with rectification section.
In addition, the inlet of five fluid passages that form between each straightener(stator) blade and the rectification section longitudinal direction in the rectification section of design rectangular cross section Z type rectification bend pipe of the present invention size is determined method, it is characterized in that this method comprises the steps:
Step 1, determine the fluid flow fields state in the rectangular cross section Z type bend pipe: according to entrance and Z type break-in segment pipe size and entrance liquid speed, adopt reynolds stress model and in conjunction with the SIMPLE algorithm, simulation is provided with velocity field in the preceding traditional rectangular cross section Z type bend pipe of rectification section then, thereby obtains the velocity distribution of rectification section position fluid;
As seen from the above, the present invention at first changes fluid flow direction by Z type break-in section, fluid is entered in the breeze way, fluid cushions in breeze way, formation waits the flow cutting by five 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, and by forming the longitudinal velocity of five equal and opposite in direction passage eliminate fluids between guide vane and the housing, thereby eliminate fluid is by formed speed layering behind the rectangular cross section Z type bend pipe, finally reach the purpose of carrying out rectification, as shown in Figure 2 to by the fluid behind the rectangular cross section Z type bend pipe.
Description of drawings
Flow velocity isoline map when Fig. 1 passes through traditional rectangular section Z type bend pipe for fluid.
Fig. 2 is the flow velocity isoline map when fluid is by rectangular cross section Z type bend pipe behind the installation rectangular cross section Z type rectification bend pipe 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 the rectangular cross section Z type bend pipe pipe outlet section velocity contour of the embodiment of the invention.
The following information of each symbolic representation among the figure: 1, entrance; 2, Z type break-in section; 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 content way of the present invention is done explanation in further detail.
Embodiment
As shown in Figure 3, a kind of rectangular cross section Z type rectification bend pipe, comprise entrance 1, Z type break-in section 2 and outlet section 7, entrance 1 one ends link to each other with Z type break-in section 2 one ends, Z type break-in section 2 the other ends connect breeze way 3, and being designed for of breeze way 3 guarantees to form in the whole rectangular cross section Z type rectification bend pipe fluid with metastable fluid characteristics herein.Be provided with the rectification section 10 that links to each other with outlet section 7 in breeze way 3 one sides; 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 the whole rectangular cross section Z type rectification bend pipe pipeline is waited the flow cutting.
Because fluid is becoming unstable through its flow characteristic after the break-in, for can being formed, it has metastable fluid characteristics, wait the flow cutting by five fluid passage convection cells that vary in size that form between straightener(stator) blade and the rectification section then, the present invention is provided with the length breeze way identical with the channel width of entrance before rectification section.
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, guide vane 8 comes flow path direction to be acute triangle dorsad, and vertically be parallel to each other with rectification section 10, formedly after fluid is by Z type break-in section 2 can eliminate by diversed blade 8, thereby eliminated the possibility that fluid forms vortexs by Z type break-in section 2 backs and increases resistance with coming the perpendicular velocity component of flow path direction.
Because the momentum transfer effect described in the background technique, it is big to form downside speed in position as shown in Figure 1, the speed layering that upside speed is little after fluid flows through rectangular cross section Z type bend pipe.Rate of flow of fluid distributes and size behind the rectangular cross section Z type bend pipe by reynolds stress model and in conjunction with flowing through of being drawn of SIMPLE algorithm in the present invention, determine 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.Realized commutator lug among the present invention under the big or small constant situation of cross section, the longitudinal velocity of convection cell is offset, thereby eliminates its formed vortex, makes fluid only have transverse velocity.Thereby, reach the rectification purpose in the layering of the speed of elimination.Referring to Fig. 2.
The present invention states the definite method of inlet size of five fluid passages that each straightener(stator) blade (4,5,6,9) and rectification section 10 in the rectification section 10 of rectangular cross section Z type rectification bend pipe form between vertically in design, it is characterized in that this method comprises the steps:
Step 1, determine the fluid flow fields state in the rectangular cross section Z type bend pipe, according to entrance 1 and Z type break-in section 2 line sizes and entrance liquid speed, operation reynolds stress model and in conjunction with the SIMPLE algorithm.
At first, find the solution momentum equation:
Find the solution pressure modified continuous 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 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.The RSM model constants, as shown in table 1:
Table 1. model constants
Simulation is provided with the rectification section 10 interior velocity field of rectangular cross section Z type rectification bend pipe before then, thereby obtains the velocity distribution of rectification section 10 position fluids, referring to Fig. 4;
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 rectangular cross section Z type rectification bend pipe with the central air-conditioner airduct is an example, at first determine rectangular cross section Z type rectification bend pipe pipeline each several part size, 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.Determine rectification section ingress size then, 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 the different of the present invention and traditional rectangular section Z type rectification winding pipe exit place velocity distribution, introduce the notion of variance here it is carried out the flow speed stability analysis.
The speed variance of the present invention and traditional rectangular section Z type rectification bend pipe compares, and traditional rectangular section Z type rectification winding pipe exit place pipeline transverse section speed variance is 3.67614, and outlet port of the present invention pipeline very section speed variance is 0.589009.Its velocity-stabilization degree has improved 84.0%.
Meanwhile, by arrangement the present invention and traditional rectangular section Z type rectification bend pipe cross 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 enters air-conditioned room, improves the comfort level of living space.
Claims (5)
1. rectangular cross section Z type rectification bend pipe, comprise entrance (1), Z type break-in section (2) and outlet section (7), it is characterized in that: entrance (1) one end links to each other with Z type break-in section (2) one ends, Z type break-in section (2) the other end connects breeze way (3), is provided with the rectification section (10) that links to each other with outlet section (7) in breeze way (3) one sides; 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. rectangular cross section Z type rectification bend pipe according to claim 1, it is characterized in that: described breeze way (3) length is identical with the channel width of entrance (1).
3. rectangular cross section Z type rectification bend pipe 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. rectangular cross section Z type rectification bend pipe according to claim 1, it is characterized in that: 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 rectification section (10) that designs rectangular cross section Z type rectification bend pipe 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 the rectangular cross section Z type bend pipe: according to entrance (1) and Z type break-in section (2) line size and entrance liquid speed, adopt reynolds stress model and in conjunction with the SIMPLE algorithm, simulation is provided with velocity field in the preceding rectangular cross section Z type bend pipe of rectification section (10) then, thereby obtains the velocity distribution value of rectification section (10) position fluid;
Step 2, determine the inlet size of five fluid passages forming between rectangular cross section Z type rectification each straightener(stator) blade of bend pipe (4,5,6,9) and rectification section (10) longitudinal direction: 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 |
|---|---|---|---|
| CN2010105202675A CN101975205B (en) | 2010-10-26 | 2010-10-26 | Rectangular section Z-shaped rectifier bent pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105202675A CN101975205B (en) | 2010-10-26 | 2010-10-26 | Rectangular section Z-shaped rectifier bent pipe |
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| Publication Number | Publication Date |
|---|---|
| CN101975205A true CN101975205A (en) | 2011-02-16 |
| CN101975205B CN101975205B (en) | 2012-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105202675A Expired - Fee Related CN101975205B (en) | 2010-10-26 | 2010-10-26 | Rectangular section Z-shaped rectifier bent pipe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226663A (en) * | 2011-04-21 | 2011-10-26 | 上海板换机械设备有限公司 | Abrasion-resistant flow guide device |
| CN110057092A (en) * | 2019-03-26 | 2019-07-26 | 淮南市知产创新技术研究有限公司 | A kind of nesting coiled Total heat exchange core |
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 CN2010105202675A patent/CN101975205B/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 (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226663A (en) * | 2011-04-21 | 2011-10-26 | 上海板换机械设备有限公司 | Abrasion-resistant flow guide device |
| CN110057092A (en) * | 2019-03-26 | 2019-07-26 | 淮南市知产创新技术研究有限公司 | A kind of nesting coiled Total heat exchange core |
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| Publication number | Publication date |
|---|---|
| CN101975205B (en) | 2012-02-01 |
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