CN108506622A - A kind of lower resistance threeway component based on arc flow deflector - Google Patents
A kind of lower resistance threeway component based on arc flow deflector Download PDFInfo
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- CN108506622A CN108506622A CN201810119619.2A CN201810119619A CN108506622A CN 108506622 A CN108506622 A CN 108506622A CN 201810119619 A CN201810119619 A CN 201810119619A CN 108506622 A CN108506622 A CN 108506622A
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- flow deflector
- pipe
- threeway
- collateral branch
- lower resistance
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/02—Branch units, e.g. made in one piece, welded, riveted
- F16L41/021—T- or cross-pieces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/027—Throttle passages
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
- Pipe Accessories (AREA)
Abstract
The invention discloses a kind of lower resistance threeway component based on arc flow deflector, it is managed including straight pipe and collateral branch, collateral branch's pipe is arranged in straight pipe side and is connected to straight pipe, the position of collateral branch's pipe setting is formed with straight pipe to be shunted, it is characterized in that, the threeway component further includes flow deflector, it is identical as the outer wall radian of collateral branch pipe that the flow deflector is an arc panel and its radian, the flow deflector is arranged in collateral branch's pipe, and its bending direction is consistent with the bending direction of collateral branch pipe.The present invention installs a flow deflector in collateral branch's pipe of traditional threeway component, and it is identical as the outer wall radian of collateral branch pipe which is an arc panel and its radian, and bending direction is consistent with the bending direction of collateral branch's pipe.On the one hand the energy dissipation in flow deflector downstream can be effectively reduced by placing flow deflector, on the other hand the divisible fluid deformation generated by Local Members, to reduce fluid resistance.
Description
Technical field
The invention belongs to air-conditioning duct systems technology fields, and in particular to a kind of threeway component, it is especially a kind of to be based on arc
The lower resistance threeway component of shape flow deflector.
Background technology
According to investigations, the fan energy consumption in central air conditioner system accounts for about the 30% of total energy consumption, section of tubing system resistance compared with
It is even up to 50% in big central air conditioner system, is based on this, how to reduce office in pipe-line system resistance especially pipe-line system
The resistance of portion's component is urgently to be resolved hurrily.It is component part indispensable in pipe-line system by the Local Members of representative of threeway, closely
Nian Laiqi resistance problems have received widespread attention.
Currently, common local resistance drag reduction mode is to install guide vane in threeway component, principle be by
It is vortexed and nearby adds guide vane, the large eddy in fluid can be decomposed into small vortex, to reduce the fluid in Local Members
Resistance.There are many research in recent years about flow deflector drag reduction consumption reduction, but existing research is studied under the premise of single velocity ratio
Influence of the guide vane to drag reduction.And in Practical Project, the velocity ratio before and after different Local Members is not a constant, both
So in this way, so in air conditioner pipeline, whether these previous results of study, which are applicable in, also needs to further study.
In addition, all the time, cognition of the people to the reduction resistance of ducting is all based on Darcy-Weisbach Formula
Pressure drop expression-form；However there are some studies have shown that it is the form of expression of the resistance of ducting that pressure, which reduces,.Resistance of ducting problem
It can also be described with the dissipative function in energy equation.However, how by guide vane reduction energy dissipation, to most
Final decline lower resistance need further to study.
Invention content
For the above-mentioned prior art the problem of, the object of the present invention is to provide one kind being based on arc flow deflector
Lower resistance threeway component.
To achieve the goals above, the present invention, which adopts the following technical scheme that, is practiced：
A kind of lower resistance threeway component based on arc flow deflector, including straight pipe and collateral branch's pipe, collateral branch's pipe setting
It is connected in straight pipe side and with straight pipe, the position of collateral branch's pipe setting is formed with straight pipe to be shunted, and the threeway component also wraps
Include flow deflector, it is identical as the outer wall radian of collateral branch pipe that the flow deflector is an arc panel and its radian, and the flow deflector, which is arranged, to exist
In collateral branch's pipe, and its bending direction is consistent with the bending direction of collateral branch pipe.
Further, the flow deflector is located at a/L in collateral branch's pipe3At=0.3~0.7, wherein a is flow deflector away from side
The distance of branch pipe outer wall；L3For the width of collateral branch's pipe.
Further, the velocity ratio V of the threeway component3/V1≤0.3。
Further, in the velocity ratio V of the threeway component3/V1When=0.1, flow deflector is located at a/L in collateral branch's pipe3=
At 0.3~0.4；Wherein, a is distance of the flow deflector away from threeway collateral branch pipe outer wall；L3For the width of collateral branch's pipe.
Further, in the velocity ratio V of the threeway component3/V1When=0.1, flow deflector is located at a/L in collateral branch's pipe3=
At 0.3.
Further, in the velocity ratio V of the threeway component3/V1When=0.2, the flow deflector is located in collateral branch's pipe
a/L3At=0.4~0.5；Wherein, a is distance of the flow deflector away from threeway collateral branch pipe outer wall；L3For the width of collateral branch's pipe.
Further, in the velocity ratio V of the threeway component3/V1When=0.2, the flow deflector is located at a/ in collateral branch's pipe
L3At=0.4.
Further, in the velocity ratio V of the threeway component3/V1When=0.3, the flow deflector is located in collateral branch's pipe
a/L3At=0.4~0.7；Wherein, a is distance of the flow deflector away from threeway collateral branch pipe outer wall；L3For the width of collateral branch's pipe.
Further, in the velocity ratio V of the threeway component3/V1When=0.3, the flow deflector is located at a/ in collateral branch's pipe
L3At=0.5.
Further, the threeway component for no reducing threeway component.
Compared with prior art, beneficial effects of the present invention are as follows：
The present invention installs a flow deflector in collateral branch's pipe of traditional threeway component, which is an arc panel and its radian
Identical as the outer wall radian of collateral branch pipe, bending direction is consistent with the bending direction of collateral branch's pipe.On the one hand placing flow deflector can have
Effect ground reduces the energy dissipation in flow deflector downstream, on the other hand the divisible fluid deformation generated by Local Members, to reduce
Fluid resistance.The present invention is not only to drag-reduction energy-saving significance, additionally it is possible in the present invention to the basis of the discussion of drag principle
On, thinking is provided for the drag reduction of other Local Members, directive significance is provided for ventilation shaft drag reduction detail design.
Description of the drawings
Fig. 1 is the error comparison diagram of different computation models and experiment in air hose resistance problem；
Fig. 2 is that model meshes each section divides schematic diagram；
Fig. 3 is threeway Pressure Field change schematic diagram under grid different demarcation number.Wherein, (a)~(e) is respectively grid
The case where being 510,000,950,000,1,440,000,1,900,000,2,400,000；
Fig. 4 is shunting T shape threeway on-the-spot test schematic diagrames；
Fig. 5 is the threeway arrangement schematic diagram in typical building corridor；
Fig. 6 is speed cloud atlas in threeway；Wherein, (a) is that Local Members generate fluid deformation；(b) it is that flow deflector forms side
Interlayer；
Fig. 7 is V3/V1Coefficient of partial resistance under=0.1 velocity ratio corresponding to five type threeway difference flow deflector positions
ζ13；
Fig. 8 is flow deflector position more best than lower five types threeway different in flow rate and corresponding drag reducing efficiency；
Fig. 9 is turbulence dissipation rate field in threeway, wherein (a) is vertical section, is (b) cross section；
Figure 10 is fan energy consumption of the five type threeways under ratio different in flow rate；
Figure 11 be threeway it is different in flow rate than when coefficient of partial resistance ζ13。
Specific implementation mode
The present invention Research Thinking be：The influence that the present invention changes dissipative function field by analyzing flow deflector, will divulge information
Coefficient of partial resistance and drag reducing efficiency of the typical threeway of five kinds of pipeline under different flow deflector positions and velocity ratio are compared, and are obtained
The placement rule of flow deflector.It is used in combination full-scale experiment to demonstrate the implementation result for adding flow deflector threeway.
One, numerical simulation
1, turbulence model applicability is verified
It is more for the selective turbulence model of air hose resistance problem in numerical simulation, mainly there are the SST moulds of two equations
The RSM models etc. of type, k-epsilon models, seven equations.The essence of resistance problem is dissipative function, and dissipative function is by speed
Gradient forms, in order to select turbulence model the most suitable, here first under different turbulent models, to changing along pipeline
The most acutely the center line velocity of (velocity gradient is maximum) has carried out experimental verification, as shown in Figure 1.It can be seen from the figure that this
The error of several models and experimental results is all within 8%.But the analogue value of RSM models and experiment value are closest, own
Point tolerance is both less than 2%, so the analogue value and experiment value is closest, the goodness of fit is best.RSM more can be simulated accurately in pipe
The reason of flow field problem may be because, RSM turbulence models it is stringenter considered streamline curvature, vortex, rotation and open
The quick variation of power, has Complex Flows the potentiality of higher accuracy prediction.In addition, in the present invention, the flow field in pipeline exists
There is vortex and secondary flow phenomenon in Local Members position, therefore RSM models are more suitable for the turbulence model of numerical simulation.It is being arranged
When RSM, RSM and the solution that difference of other turbulence models in mathematical computations is to eddy stress equation.There are three parameters
Direct relation
The Numerical accuracy for RSM simulations, is C respectivelyk,C1And C2, take Ck=0.1, C1=1.5, C2=0.4.
2, mesh independent verification and mesh generation
Some studies have shown that Local Members generate wraps correction upstream flow field influence length be 5~7 times of calibers, it is right
The influence length in downstream flow field is 30~50 times of calibers.Therefore the pipeline section 1-2 that threeway model is arranged in the present invention is 35 times of hydraulic diameters,
Pipeline section 3-4, pipeline section 5-6 are 60 times of hydraulic diameters.In grid division, entire pipeline is divided into straight tube 1-2,5-6,3-4 and three
Logical tetra- parts 2-5-3.Due to the effect of boundary layer of fluid, the velocity gradient that near wall goes out is larger, therefore leans near wall to pipeline
The grid at place has carried out local cypher.The present invention carries out grid division using ICEM-CFD16.1, with Fluent14.5 into line number
Value calculates.It due to the flow deflector with the presence of arc shape at threeway, is divided using unstrctured grid, threeway is outer (all straight tubes)
It is divided using structured grid.Model each section mesh generation is as shown in Figure 2.
The efficiency of how much decision grid operations of number of grid：Number of grid is fewer, and computational accuracy is poorer.So into
It when row numerical computations, needs to find suitable lattice number, that is, carries out the independence verification of grid.The present invention is respectively created 51
Ten thousand, the model of 950,000,1,440,000,1,900,000,2,400,000 grids, other conditions are identical, 7000 step of respective iteration.After the completion of iteration,
The pressure cloud charts for observing vertical section in threeway Local Members, are tested according to pressure field situation of change to carry out mesh independent
Card.As it can be seen that when grid progressively increases to 1,900,000 or more, pressure field inside threeway no longer as number of grid increases and
Variation, is shown in Fig. 3.Therefore the present invention selects the model of number of grid 1,900,000, maximum unit mesh volume 0.052cm3, minimum net
Lattice volume 3.42cm3.Meanwhile simulation uses a speed entrance as entrance boundary condition, a speed is exported with one certainly
It is used as export boundary condition, wall surface boundary to be permeated using absolute roughness k=0.15mm, without velocity-slip and without speed by outlet
Condition, governing equation are solved by discrete solution.Coupling between pressure and flow velocity uses SIMPLE algorithms.
Two, model investigation
In the present invention, full-scale experiment platform has been made, as shown in figure 4, including centrifugal blower, connecting hose, plenum chamber, disorderly
Flowing plate, rectangular air duct, arc-shaped standard threeway, reducing, 2 butterfly valves.By connecting hose phase between centrifugal fan and rectangular air duct
Even, flanged joint is used between air hose and air hose and carries out encapsulation process.In installation plenum chamber and turbulent flow at 4 meters of wind turbine
Plate, carrying out rectification to the unstable air-flow sent out from wind turbine makes it uniformly.It can ensure in this way through threeway upstream straight pipe
Air-flow is fully developed flow, it is ensured that experiment is more accurate.
In the present invention, threeway upstream is chosen apart from the positions threeway entrance 25D (D refers to pipe diameter), namely in threeway
The pressure test section as total pipeline section at section 8m is swum, test pressure value is Px1；32D, that is, branch pipe is being exported away from tee branch section
As the pressure test section of branch pipeline section at 8 meters of downstream, test pressure value is Px4.The survey of selected distance threeway farther out when test
Examination section is tested, main to consider that the effect of threeway resistance itself is not limited to threeway itself, also spreads over the upper of threeway
Downstream, and have 10D or more sphere of actions.When test measuring point apart from threeway farther out, so the threeway data finally obtained are actually
It is the numerical value for subtracting straight pipe on-way resistance.With threeway coefficient of partial resistance ζ13For, first, section when test is with threeway
The pressure of Isosorbide-5-Nitrae, is denoted as Px1And Px4.Secondly, it tests without threeway, the i.e. pressure of straight pipe 1-2 and straight pipe 3-4, this pressure
Under air supply velocity with threeway when air supply velocity it is identical.The pressure of section 1,2,3,4 is respectively p 'z1, p 'z2, p 'z3,
p′z4.According to the computational methods in U.S.'s ASHRAE design specifications, coefficient of partial resistance ζ13It can be calculated according to formula (2)：
In formula, (p 'z1-p′z2) and (p 'z3-p′z4) be respectively pipeline section 1-2 and pipeline section 3-4 on-way resistance, Δ p14It is three
Logical local resistance, ρ are atmospheric density, v12For the flow velocity of pipeline section 1-2, Pd12For the dynamic pressure of pipeline section 1-2.
Each measuring point in 15 measuring points of all Measure sections measures 4 data, finds out the first time of each measuring point
Average value.15 measuring point datas of average measurement section again, obtain second of average value, which is then the measurement of the section
Value.Standard error is used to measure the error of coefficient of partial resistance.The standard error for measuring pipeline section 1-4 resistances is as follows：
In addition, the standard error for measuring the coefficient of partial resistance of pipeline section 1-4 is as follows：
σ in formulapx1、σpx4、σ′pz1、σ′pz2、σ′pz3、σ′pz4The standard error of the total head of respectively above-mentioned measurement point, σpd12
For the standard error of the pipeline section 1-2 dynamic pressure measured,The average value of respectively above-mentioned measured value.
Experiment tests wind speed using TSI hot-wire anemometers, and total head is then surveyed using E0-100Pa intelligent digital differential manometers
Examination, the measurement range and precision of two kinds of instruments are shown in Table 1.
1 test equipment measurement range of table and precision
Three, present invention research hypothesis used
The basic assumption that the present invention is based on is, it is only necessary to the ζ of threeway13Drag reduction is carried out, without considering ζ12
Size.Fig. 5 is an air conditioning wind pipe layout drawing in typical L-type corridor.It is well known that there are two local resistance systems for threeway
Number, first, the coefficient of partial resistance ζ of straight tube12, second is that the coefficient of partial resistance ζ of branch pipe13.Water force based on air-line system
Principle, in Figure 5 the resistance of index circuit be branch pipe be connected each section on-way resistance plus three tee branch part resistance
Power.So the resistance caused by threeway a, b, c, actually these three threeways are to the resistance namely ζ caused by branch pipea13,
ζb13,ζc13.As long as so weakening ζa13,ζb13,ζc13Size, you can play the role of drag reduction.And ζa12,ζb12,ζc12Drag reduction exist
Effect is had no in this Engineering Projects.Reason 1：ζa12,ζb12,ζc12It is not belonging to index circuit, is not involved in drag evaluation and wind turbine
Type selecting.Reason 2：Straight tube with branch pipe coefficient of partial resistance not in an order of magnitude, in most cases, the local resistance system of branch pipe
Number is more than ten times even tens times of straight pipe, so it is more meaningful to reduce branch pipeline section resistance.Reason 3, by taking room 1 as an example, i.e.,
Make, by optimization, to reduce ζa12Size, but due to hydraulically balanced requirement, it is also necessary to turn down the air-valve in room to increase
The resistance of branch just can guarantee that the air capacity being sent into room 1 is met the requirements.Such phenomenon is largely present in Practical Project.
Certainly also there is counter-example, when supervisor and branch pipe relationship is reverse, ζ12It will determine threeway drag size.At this moment drag-reduction effect of the invention is not
It sets up,
It only needs to be substituted for traditional threeway, or optimizes ζ with reference to straight pipe12The research of aspect.
In addition, the flowing in pipeline meets Navier-Stokes equations.In the equation, fluid resistance can be expressed as
The volume form-separating of energy dissipation, expression formula are as follows：
In this equation, x, y, z represent three-dimensional coordinate, Ux, Uy, and Uz is the velocity component under this coordinate, and μ is the viscosity of fluid
Coefficient.As can be seen from the above equation, dissipative term is actually the function of velocity gradient.As shown in fig. 6, guide vane, which is added, to be caused
Both sides result：
A, reduce fluid deformation → abatement large eddy → reduction velocity gradient → reduction energy dissipation → drag reduction.
B, increase new wall surface → introducing boundary layer → to increase speed gradient → increase energy dissipation → increasing resistance.
The opposite influence of these two aspects being added caused by flow deflector can carry out game, and fluid generally increases resistance or drag reduction
Just see the result of game.It is different to place flow deflector position, payoff also can be variant.The present invention is by analyzing turbulent dissipation
Rate finds the most suitable position of flow deflector, reaches best drag-reduction effect.The result of last full-scale experiment also demonstrates this
The correctness of theory analysis and analog result.
Four, the analysis of flow deflector is installed in threeway additional
1, threeway type
Following several more typical in shunting T-type threeway type, specific size is as shown in table 2.
Threeway type and its size are commonly used in 2 engineering of table
2, the Analysis on Selecting of best flow deflector position
The present invention is directed to ζ13Drag reduction is carried out, flow deflector is placed in pipeline section 3-4 (collateral branch's pipe), water conservancy diversion plate shape is arc
Template, radian is identical as the outer wall radian of threeway collateral branch pipe, and its bending direction is consistent with collateral branch's pipe bending direction.A is to lead
Distance of the flow away from collateral branch's pipe outer wall, L3For the width of pipeline section 3-4, a/L3=0.1~0.9, a/L3It is equal to be often separated by 0.1 flow deflector
It can place, as shown in Figure 7.a/L3Bigger, flow deflector is just closer to collateral branch's inside pipe wall, therefore with a/L3Size judge flow deflector
Position.In typical rate ratio V3/V1(V under=0.13It is collateral branch's pipe speed, V1It is straight pipe speed), for above five type
The threeway of type, coefficient of partial resistance ζ13Change with flow deflector change in location.It is moved from threeway outer wall inward wall flow deflector position
During, ζ13There are one increased trend after first reducing, when flow deflector position is in a/L3When at=0.3, ζ13It is minimum.This five kinds
Threeway type is in identical flow velocity ratio V3/V1The position of best flow deflector under=0.1 is identical, is all in a/L3At=0.3, and nothing
Threeway (T1) drag reducing efficiency highest of reducing.By such method, work as V3/V1When variation, all types threeway drag reducing efficiency and most preferably lead
Flow position can also be decided therewith.
3, impact analysis of the velocity ratio to best flow deflector position and drag reducing efficiency
By five type threeways in velocity ratio V3/V1Best flow deflector position under=0.1,0.2,0.3,0.4 and corresponding
Drag reducing efficiency is listed, such as Fig. 8.It can be seen that the a/L corresponding to best flow deflector position3Value is with speed ratio V3/V1Increase and increase.
So working as speed ratio V3/V1When increase (≤0.3), the position of best flow deflector is just further away from threeway incoming side.But this five kinds simultaneously
The drag reducing efficiency of threeway all has a declining tendency, and especially works as V3/V1When increasing to 0.4, almost without drag-reduction effect.
4, impact analysis of the velocity ratio to best flow deflector position and dissipative shock wave
The main affecting parameters of threeway internal resistance are actually energy absorbing device caused by fluid deformation.Here in threeway
Type T5 and V3/V1Under the premise of=0.1 typical rate ratio, to no flow deflector and flow deflector in a/L3Cross, section at=0.3 into
It has gone turbulence dissipation rate comparative analysis, has seen Fig. 9.It is found for the dissipative shock wave field in vertical section, not plus at the threeway outer wall of flow deflector
Energy dissipation be apparently higher than other regions, value is in 45m2/s3Left and right.After installation flow deflector is shunted, energy absorbing device
It reduces obviously, is significantly reduced by the near wall fluid length of Turbulent Flow Effects.Although the fluid of downstream straight tube and branch pipe intersection
Energy dissipation improves, but that is to belong to coefficient of partial resistance ζ12, have no effect on ζ13.Pass through the downstream of comparative analysis flow deflector again
Transversal profile adds the energy dissipation intensity of branch pipe side wall after flow deflector to be substantially reduced.Meanwhile dissipation of the section in mainstream region
The minority of fluid being focused under the influence of flow deflector makes the energy dissipation in entire mainstream region reduce.So (a/L here3
=0.3) add flow deflector that can finally reduce the energy dissipation of fluid in threeway, reach drag reduction purpose.
The calculation formula of wind turbine energy expenditure caused by local resistance is as follows in air conditioner pipeline：
N=Q Δs P (6)
In formula, N is wind turbine wasted work, unit：w；Q is the flow of manifold, unit：m3/h；Δ P is the pressure before and after Local Members
Force difference, unit：pa.Behind optimum position plus flow deflector, the dissipative shock wave of fluid reduces, and the energy consumption of threeway also reduces therewith.By propping up
Pipe drag reducing efficiency and formula (6) can calculate, compared with the threeway for being not added with flow deflector originally, when velocity ratio is when between 0.1~0.3,
There is energy-efficient effect.The fractional energy savings of branch pipeline section is 5.2%~38.4%, and the fan energy consumption of wherein T1 is minimum, the fan energy consumption of T3
Maximum is shown in Figure 10.
The present invention continues to give best flow deflector position of several regular size threeways under ratio different in flow rate, Yi Jiyu
Corresponding fractional energy savings, be shown in Table 3.
The best flow deflector position of 3 several regular size threeways of table and fractional energy savings list
5, experimental verification is analyzed
To sum up, the drag-reduction effect of flow deflector, the present invention is added to use full-scale experiment to verify threeway under each velocity ratio
Two-sided inclined threeway T5 is measured respectively in flow deflector in a/L3At=0.6 and do not fill resistance when flow deflector.It also provides a comparison of simultaneously
Simulation, experiment and forefathers have reducing, do not fill flow deflector threeway under conditions of respective coefficient of partial resistance ζ13, see Figure 11.Research
It was found that with the variation of velocity ratio, whether the analogue value, experiment value or forefathers' research, the trend of three's data are completely the same.
In addition, since simulated conditions are identical with the three-port structure size under experiment condition, so property of coincideing is best.
Five, conclusion
The present invention has studied common five kinds typical threeways in engineering, and it is specific than under in different flow to analyze flow deflector
Placement location rule, and compared fan energy consumption of the threeway under with and without flow deflector.It is result of study below：
1, as velocity ratio V3/V1When≤0.3, flow deflector is added in different types of threeway, all to ζ13There are drag-reduction effect, drag reduction
Rate is 5.2% to 38.4%.
2, as velocity ratio V3/V1Bigger, best flow deflector position is at threeway internal face.
3, the velocity ratio V of same threeway3/V1Increase, branch pipe drag reducing efficiency becomes smaller, and works as V3/V1When >=0.4, no drag reduction effect
Fruit.
4, the best flow deflector position rule for the shunting T shape threeways that different dimension combinations are constituted is substantially similar：Work as V3/V1=
When 0.1, the best flow deflector position a/L of recommendation3=0.3；Work as V3/V1When=0.2, the best flow deflector position a/L of recommendation3=
0.4；Work as V3/V1When=0.3, the best flow deflector position a/L of recommendation3=0.6.Work as V3/V1When >=0.4, water conservancy diversion is not recommended
Piece drag reduction.
5, under same velocity ratio, the fan energy consumption of no reducing tee T1 is minimum, can be in the case where other conditions meet
It is preferential to select the threeway without reducing.
6, flow deflector just has energy-saving effect under specific velocity ratio and position, so being needed in the pipe design stage careful
It considers whether to need to place flow deflector again.
Claims (10)
1. a kind of lower resistance threeway component based on arc flow deflector, including straight pipe and collateral branch's pipe, collateral branch's pipe setting exist
Straight pipe side is simultaneously connected to straight pipe, and the position of collateral branch's pipe setting is formed with straight pipe to be shunted, which is characterized in that the threeway
Component further includes flow deflector, and it is identical as the outer wall radian of collateral branch pipe that the flow deflector is an arc panel and its radian, the water conservancy diversion
Piece is arranged in collateral branch's pipe, and its bending direction is consistent with the bending direction of collateral branch pipe.
2. the lower resistance threeway component based on arc flow deflector as described in claim 1, which is characterized in that the flow deflector exists
It is located at a/L in collateral branch's pipe3At=0.3~0.7, wherein a is distance of the flow deflector away from collateral branch's pipe outer wall；L3For the width of collateral branch's pipe
Degree.
3. the lower resistance threeway component based on arc flow deflector as described in claim 1, which is characterized in that the threeway component
Velocity ratio V3/V1≤0.3。
4. the lower resistance threeway component based on arc flow deflector as described in claim 1, which is characterized in that in the threeway structure
The velocity ratio V of part3/V1When=0.1, flow deflector is located at a/L in collateral branch's pipe3At=0.3~0.4；Wherein, a is flow deflector away from three
The distance of logical collateral branch pipe outer wall；L3For the width of collateral branch's pipe.
5. the lower resistance threeway component based on arc flow deflector as claimed in claim 4, which is characterized in that in the threeway structure
The velocity ratio V of part3/V1When=0.1, flow deflector is located at a/L in collateral branch's pipe3At=0.3.
6. the lower resistance threeway component based on arc flow deflector as described in claim 1, which is characterized in that in the threeway structure
The velocity ratio V of part3/V1When=0.2, the flow deflector is located at a/L in collateral branch's pipe3At=0.4~0.5；Wherein, a is flow deflector
Distance away from threeway collateral branch pipe outer wall；L3For the width of collateral branch's pipe.
7. the lower resistance threeway component based on arc flow deflector as claimed in claim 6, which is characterized in that in the threeway structure
The velocity ratio V of part3/V1When=0.2, the flow deflector is located at a/L in collateral branch's pipe3At=0.4.
8. the lower resistance threeway component based on arc flow deflector as described in claim 1, which is characterized in that in the threeway structure
The velocity ratio V of part3/V1When=0.3, the flow deflector is located at a/L in collateral branch's pipe3At=0.4~0.7；Wherein, a is flow deflector
Distance away from threeway collateral branch pipe outer wall；L3For the width of collateral branch's pipe.
9. the lower resistance threeway component based on arc flow deflector as claimed in claim 8, which is characterized in that in the threeway structure
The velocity ratio V of part3/V1When=0.3, the flow deflector is located at a/L in collateral branch's pipe3At=0.5.
10. the lower resistance threeway component based on arc flow deflector as described in claim 1, which is characterized in that the threeway structure
Part for no reducing threeway component.
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| CN108506622B (en) | 2019-10-11 |
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