CN108427822A - Whirlpool for promoting douche performance of anti-blockage washes wall optimization method - Google Patents
Whirlpool for promoting douche performance of anti-blockage washes wall optimization method Download PDFInfo
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- 229940059082 douche Drugs 0.000 title claims abstract description 72
- 238000005457 optimization Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000001737 promoting effect Effects 0.000 title claims abstract description 12
- 239000002245 particle Substances 0.000 claims abstract description 21
- 238000009415 formwork Methods 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000004088 simulation Methods 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims abstract description 9
- 239000007787 solid Substances 0.000 claims abstract description 9
- 230000008685 targeting Effects 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 238000010008 shearing Methods 0.000 claims description 23
- 239000013618 particulate matter Substances 0.000 claims description 11
- 239000012530 fluid Substances 0.000 claims description 10
- 238000009826 distribution Methods 0.000 claims description 8
- 230000005484 gravity Effects 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 3
- 238000000205 computational method Methods 0.000 claims description 3
- 238000002405 diagnostic procedure Methods 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 238000012913 prioritisation Methods 0.000 claims description 3
- 230000035939 shock Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 8
- 230000002262 irrigation Effects 0.000 description 8
- 238000003973 irrigation Methods 0.000 description 8
- 238000011161 development Methods 0.000 description 7
- 230000000903 blocking effect Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 6
- 206010019233 Headaches Diseases 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 231100000869 headache Toxicity 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
The whirlpool that the present invention relates to a kind of for promoting douche performance of anti-blockage washes wall optimization method, includes the following steps：1) by implementing three-dimensional structure scanning to douche, the threedimensional model of its inner flow passage structure is obtained；2) the quasi- computation model of the defeated shifting formwork of douche runner internal particle object under the influence of the first film of foundation；3) the model progress solid, liquid, gas Three-phase Flow simulation of douche runner section under the conditions of first film attachment is finally inversed by step 1) using the computation model in step 2), is diagnosed to be the position to be optimized that may be blocked in runner；4) targeting circular arc optimization is carried out to the position to be optimized being diagnosed to be in step 3), i.e., will be connected by the way of circular arc between its boundary.
Description
Technical field
The whirlpool that the present invention relates to a kind of for promoting douche performance of anti-blockage washes wall optimization method, belongs to agricultural irrigation
Technical field.
Background technology
Development trickle irrigation is to realize agricultural water conservation, highly efficient and productive important channel, for ensureing agricultural product security supply, band
Dynamic peasant programme pushes agricultural modernization significant.And douche is the heart of drip irrigation system, its quality is straight
It connects and influences system job stability and quality height of pouring water, but because its inner flow passage narrow (only 0.5~1.2mm), structure are multiple
It is miscellaneous, therefore easily cause raw block.Douche blockage problem has become the major obstacle for restricting drip irrigation technique application and promoting.Xinjiang
Formation underground drip irrigation development area is forced to fall sharply to 1000 mu of 14 years, Qinghai mutual assistance from 120,000 mu of 05 year because of blocking
2800 mu of drip irrigation projects are scrapped because of blocking, and douche blocks the international headache for having become trickle irrigation field.Israel Netafim etc.
Enterprise carries out continuous structure optimization to achieve the purpose that promote its performance of anti-blockage to existing product, but still fails to obtain
It solves very well, how a hot issue is had become to promote douche anti-blockage capability by douche structure optimization.
In order to meet the requirement of precision and speed of production that douche produces, need to regularly replace mold, this is also to pour water
The upgrading of device provides chance, and how to carry out performance boost to existing douche product is put in face of numerous manufacturers
The problem of.Also there are many experts and scholars to propose douche optimum design method at present, such as：China Agricultural University Li Yun such as opens at (the Shen
It please publication No.：CN106096179A drip emitter flow passage structure design method disclosed in) and its fractal runner douche product,
This method has considered the hydraulic performance and performance of anti-blockage of drip emitter in the design process, includes mainly analogy method
The stages such as foundation, the selection of runner configuration, determining, the flow path boundary optimization of structural parameters；Beijing Inst. of Water Conservancy Science explains dawn
Deng (application publication number：CN101667218) the disclosed douche anti-clogging design for eliminating suspended particle aggregation position in runner
Method, this method go out maximum concentration of suspended particles closest to entrance using computation fluid dynamics solid-liquid two-phase flow model discrimination
The flow channel shape of concentration of suspended particles.But both methods, which focuses on, designs and develops new product, and easy for existing product
The case where blocking, optimizes improvement.
Invention content
In view of the above-mentioned problems, the whirlpool that the object of the present invention is to provide a kind of for promoting douche performance of anti-blockage washes wall
Optimization method, this method are a kind of system sides that the easy blocking position implemented for existing product diagnoses, targets structure optimization
Method.
To achieve the above object, the present invention uses following technical scheme：It is a kind of to be used to promote douche performance of anti-blockage
Whirlpool washes wall optimization method, includes the following steps：1) by implementing three-dimensional structure scanning to douche, its inner flow passage knot is obtained
The threedimensional model of structure；2) the quasi- computation model of the defeated shifting formwork of douche runner internal particle object under the influence of the first film of foundation；3) step is utilized
It is rapid 2) in computation model be finally inversed by the model of douche runner section under the conditions of the attachment of first film to step 1) and carry out solid, liquid, gas
Three-phase Flow is simulated, and the position to be optimized that may be blocked in runner is diagnosed to be；4) to be optimized to what is be diagnosed to be in step 3)
Position carries out targeting circular arc optimization, i.e., will be connected by the way of circular arc between its boundary.
The mistake for the computation model that the defeated shifting formwork of douche runner internal particle object is intended under the influence of the first film of foundation in the step 2)
Journey is as follows：
Filter the big whirlpool equation of momentum such as formula (1) after microvortex：
In view of the influence in the big whirlpool of small vortex pair, the computational methods such as formula (2) of shearing force in formula (1)：
WhereinIt is defined as：
In above-mentioned formula,The respectively component of average speed of the fluid flow rate on the direction i, j；xi、xjRespectively
Component of the x-axis on the direction i, j；ρ is the fluid density of normal atmosphere pressure,For average water head pressure；μ is viscosity；t
For time, τijFor sub- grid power；μtFor the sub- grid coefficient of eddy viscosity；For the deformation-rate tensor of scale can be solved；τkkFor shearing
Power；δijFor laminar flow layer thickness, LsFor tubulence energy and tubulence energy dissipative shock wave,For deformation-rate tensor matrix determinant；
Collision model when elastic restitution coefficient is 0.5 is chosen, such as formula (5)：
Wherein, U is particulate matter general speed value, and u, v are component of the particulate matter speed in two change in coordinate axis direction of x, y, f respectively
For friction factor, α is empirical coefficient；
On this basis, consider additional tension stress, inertia force, gravity, barometric gradient, drag force, buoyancy, Saffman power etc.
The influence of power, i.e.,：
Wherein, u, v are component of the particulate matter speed in two change in coordinate axis direction of x, y, v respectivelypIt is speed v in the directions p
Component；upComponent for speed u in the directions p；P is gross head pressure；ρpIt is the jet density under pressure p； FrFor Froude number；
D is particle diameter；R is particle radius；ρ is the fluid density of normal atmosphere pressure；G is acceleration of gravity；CDFor empirical coefficient.
In the step 3), the method for performance of anti-blockage position to be optimized is as follows inside diagnostic method douche runner：It answers
With the defeated shifting formwork analog model of douche runner internal particle object under the influence of the first film built in step 2), to what is be finally inversed by step 1)
Douche flow passage structure carries out solid, liquid, gas Three-phase Flow simulation, obtains douche near wall shearing force distribution situation, diagnoses it
Whether hydraulic boundary shearing force is in control threshold (τ ∈ (0,0.2Pa) ∪ (0.4Pa ,+∞)) range, if it is in
Between (0.2Pa, 0.4Pa), then the position is the position to be optimized that possible block.
Carrying out the method that targeting circular arc optimizes to position to be optimized in the step 4) is：First to crown backwater area and tooth
Root meets water area or crown meets water, and the 1/3 and 1/2 circular arc optimization that radius is width of flow path is respectively adopted with tooth root backwater area in area flows
Road boundary, in two kinds of optimal ways, select the scheme that near wall shearing force is not in the sections 0.2~0.4Pa as
Final optimization pass scheme；If near wall shearing force is not in the sections 0.2~0.4Pa in the case of two kinds, selection whirlpool is selected
More abundant, high 1/2 of turbulence intensity circular arc optimal way is developed as final optimization pass scheme in whirlpool.
The invention adopts the above technical scheme, which has the following advantages：1, the present invention, which innovatively proposes, pours water
The series methods of device structural scan-defect diagonsis-structure optimization, establish it is a kind of promoted douche performance of anti-blockage whirlpool wash
Wall optimization method has the problem of douche product performance of anti-blockage so as to efficiently solve to be promoted.2, the present invention proposes
It is a kind of reversely obtain by 3-D scanning technology block substance at the beginning of under the conditions of film attachment flow passage structure method, solving can not
Accurate the problem of obtaining douche runner three-dimensional physical model under the conditions of first film adheres to.3, the present invention is by building complicated just film shadow
The defeated shifting characteristic simulation model of douche runner internal particle object under ringing, solves the precision problem of existing modeling.4, originally
Control threshold of the invention based on flow path boundary Osima jacoti, Osima excavata, by carrying out numerical value to the unplugged flow passage structure part being finally inversed by
Simulation calculates, and solves the accurate decision problem in performance of anti-blockage position to be optimized inside douche runner.5, the present invention proposes
The whirlpool for promoting the symmetrical optimization targeting point of matured product performance of anti-blockage washes wall optimum design method, realizes maximum limit
The formation of the complicated just film of control of degree, to solve the problems, such as that position anti-blockage capability to be optimized is poor.
Description of the drawings
Fig. 1 is the flow diagram of the present invention；
Fig. 2 is the parameter schematic diagram of DRIPLINE series douche products；Each meaning of parameters in figure is as follows：H- teeth are high
Degree；θ-tooth angle degree；S- space widths；D- width of flow path；L- flow channel lengths (runner centerline length)；
Fig. 3 is the blocking substance distribution map obtained to DRIPLINE series douche 3-D scannings；
Fig. 4 is to exporting CAD diagram after DRIPLINE series douche 3-D scannings；
Fig. 5 is DRIPLINE series douche runner internal shear power distribution schematic diagrams；
Fig. 6 is the structural schematic diagram that runner uses different boundary optimization；Wherein, figure (a) is optimized using orthodrome, figure
(b) it is to be optimized using small arc-shaped；The meaning of each parameter is as follows in figure：A-crown backwater area；B-crown meets water area；C-tooth root
Backwater area；D-tooth root meets water area；D-width of flow path；R-circular arc optimizes radius；
Fig. 7 is the shearing force distribution map that douche uses different boundary optimization；Wherein, figure (a) is optimized using orthodrome,
Figure (b) is optimized using small arc-shaped；
Fig. 8 is that DRIPLINE series douches select the structural schematic diagram after optimal prioritization scheme；
Fig. 9 is that DRIPLINE series douches select the shearing force distribution schematic diagram after optimal prioritization scheme.
Specific implementation mode
The present invention is described in detail below with reference to the accompanying drawings and embodiments.
As shown in Figure 1, the present invention proposes that a kind of whirlpool for promoting douche performance of anti-blockage washes wall optimization method, wrap
Include following steps：
1) by implementing three-dimensional structure scanning to douche, the threedimensional model of its inner flow passage structure is obtained.
Three-dimensional unperturbed scanning is carried out to douche overall structure using 3 D scanning system, be broadly divided into data acquisition,
Depth data registration, Construction of A Model three parts.
Data acquisition：Mainly inside the 3 D scanning system existing for laser beam emitting device and reality by Laser Detecting Set
It is existing.It can calculate and sweep according to the time difference between radiating laser beams and reception using laser beam sweeping target surface when scanning
The concave-convex degree of portion of runner surface each point is retouched, constantly controls the movement of laser beam in the horizontal direction and the vertical direction, i.e.,
It can complete the scanning of entire runner profile.
The measurement point data for being scanned through acquisition forms point cloud preservation.
Depth data is registrated：Since the visual field of scanner limits, multiple subregional scanning need to be carried out, so to be swept
The splicing of tracing picture need to carry out depth data matching that is, after scan data forms point cloud preservation.Due to twice sweep point cloud
Space coordinates basic point is different, four repetition points need to be searched out between two clouds, to realize the conversion of coordinate system, i.e.,
Point cloud.
Construction of A Model：Realize that the image after point cloud is douche three dimensional physical under the conditions of the first film attachment scanned
Model.3D scanning figures can be converted into the file format of STL by the poster processing soft of 3 D scanning system, it can should
Model is introduced directly into the three-dimensional modeling softwares such as CAD and opens, and is further finally inversed by douche runner under the conditions of just film attachment
Partial threedimensional model.
2) the quasi- computation model of the defeated shifting formwork of douche runner internal particle object under the influence of the first film of foundation.
On the basis of large eddy simulation, large scale eddy is moved to characterize microvortex by introducing sublattice (SGS) model
Influence, and take particulate matter-collision with wall model of wall roughness into consideration, build under the influence of just film inside douche runner
The defeated shifting formwork analog model of particulate matter.
Filter the big whirlpool equation of momentum such as formula (1) after microvortex：
In view of the influence in the big whirlpool of small vortex pair, the computational methods such as formula (2) of shearing force in formula (1)：
WhereinIt is defined as：
In formula,The respectively component of average speed of the fluid flow rate on the direction i, j；xi、xjRespectively x-axis exists
I, the component on the directions j；ρ is the fluid density of normal atmosphere pressure,For average water head pressure；μ is viscosity；When t is
Between, τijFor sub- grid power；μtFor the sub- grid coefficient of eddy viscosity；For the deformation-rate tensor of scale can be solved；τkkFor shearing force；δij
For laminar flow layer thickness, LsFor tubulence energy and tubulence energy dissipative shock wave,For deformation-rate tensor matrix determinant.
Three kinds of elastic collision, inelastic collision and completely inelastic collision situations are compared to particulate matter-collision with wall model
Influence, the final collision model chosen when elastic restitution coefficient is 0.5.
Wherein, U is particulate matter general speed value, and u, v are component of the particulate matter speed in two change in coordinate axis direction of x, y, f respectively
For friction factor, α is empirical coefficient.
On this basis, it is also considered that additional tension stress, inertia force, gravity, barometric gradient, drag force, buoyancy, Saffman
The influence of the power such as power.I.e.：Additional tension stress+inertia force+gravity+difference force+Basset power+resistance+lift+Saffman power=
0, expression is shown in formula (8)：
I.e.：
Wherein, u, v are component of the particulate matter speed in two change in coordinate axis direction of x, y, v respectivelypIt is speed v in the directions p
Component；upComponent for speed u in the directions p；P is gross head pressure；ρpIt is the jet density under pressure p； FrFor Froude number；
D is particle diameter；R is particle radius；ρ is the fluid density of normal atmosphere pressure；G is acceleration of gravity；CDFor empirical coefficient.
3) computation model in step 2) is utilized to be finally inversed by douche runner section under the conditions of first film adheres to step 1)
Model carries out solid, liquid, gas Three-phase Flow simulation, is diagnosed to be the position to be optimized that may be blocked in runner.
Based on the control threshold of flow path boundary Osima jacoti, Osima excavata, propose one kind by Simulation On Flow Characteristics with clear douche
The diagnostic method of performance of anti-blockage position to be optimized inside runner is specially：Applying step 2) in build first film under the influence of
The defeated shifting formwork analog model of douche runner internal particle object carries out solid, liquid, gas to the douche flow passage structure being finally inversed by step 1)
Three-phase Flow is simulated, and obtains douche near wall shearing force distribution situation, whether diagnoses its hydraulic boundary shearing force in control
In threshold value (τ ∈ (0,0.2Pa) ∪ (0.4Pa ,+∞)) range, if it is between (0.2Pa, 0.4Pa), then the position be can
The position to be optimized that can be blocked.
4) targeting circular arc optimization is carried out to the position to be optimized being diagnosed to be in step 3), i.e., will uses circular arc between its boundary
Mode connect.
Targeting circular arc optimization is carried out to the position to be optimized being diagnosed to be in step 3) problem diagnosis, i.e., will be adopted between its boundary
It is connected with the mode of circular arc.In view of the symmetry of whirlpool development, therefore symmetrical optimization, example are taken to the symmetrical region of flow passage unit
If meet water area and tooth root backwater area, crown backwater area and tooth root of crown meets water area, in such cases, whirlpool develop it is the most abundant,
The rotation of its whirlpool is obviously improved near wall flow velocity, and flow is most strong to the scouring capability and the defeated shifting ability of particulate matter of near wall, pours water
The self-cleaning ability highest of device, the formation of the complicated just film of final control.
Its specific optimization method is：It meets water area's (crown meet water area and tooth root backwater area) to crown backwater area and tooth root first
Radius is respectively adopted as 1/3 and 1/2 circular arc optimizing flow passage boundary of width of flow path, in two kinds of optimal ways, selects near wall
Shearing force is not at a scheme in the sections 0.2~0.4Pa as final optimization pass scheme；If near wall in the case of two kinds
Shearing force is not in the sections 0.2~0.4Pa, then selects 1/2 circular arc that selection whirlpool development is more abundant, turbulence intensity is high
Optimal way is as final optimization pass scheme.
After similarly using radius to optimize to all easy blocking positions being diagnosed to be for 1/3 and 1/2 circular arc of width of flow path,
And when determining that its Osima jacoti, Osima excavata is within the scope of control threshold, the optimization that whirlpool development is more abundant, turbulence intensity is high is selected
Mode is as final optimization pass scheme.
After completing above-mentioned optimization, in conjunction with step 1)~4) available new douche structural configuration, thus it can be filled
Hydrophone three-dimensional is shaped, and develops high-precision mold, final according to user's application demand, selectes the keys such as trickle irrigation tube material, wall thickness
Parameter realizes the industrialization of douche new product.Wherein, the progress of the UG NX groupwares can be used in three-dimensional type-approval process, and mold is opened
It sends out precision and is not less than ± 5 μm.
Illustrate the technique effect of the present invention below by a specific embodiment：
Netafim companies DRIPLINE series chip douche product (the specified streams that the present embodiment is 5% with chocking-up degree
Amount is 1.38L/h) it is optimization object, design parameter such as Fig. 2 carries out it performance of anti-blockage optimization, and specific optimization process is such as
Under：
1) by implementing three-dimensional structure scanning to douche, the threedimensional model of its inner flow passage structure is obtained.
This practicality example is used cooperatively with Vxelements softwares using HandySCAN 3D scanners and is carried out to flow passage structure
Scanning, precision is up to 0.02mm.After data acquisition, depth data registration, Construction of A Model process, just film attachment item is obtained
Douche runner three-dimensional physical model (as shown in Figure 3) under part.Vxelements softwares can be acquired the data of scanning,
Optimization and processing, wherein for VXscan modules for acquiring and optimizing 3D scan datas, VXmodel is that a post-processing is soft
Part, data directly directly can be exported STL format charts by it from the data after optimization, and CAD can be opened and used directly, derived
CAD diagram is as shown in Figure 4.
2) the quasi- computation model of the defeated shifting formwork of douche runner internal particle object under the influence of the first film of foundation.
3) utilize step 2) in computation model to step 1) be finally inversed by just film attachment under the conditions of douche runner section into
Row solid, liquid, gas Three-phase Flow is simulated, and the position to be optimized that may be blocked in runner is diagnosed to be.
Applying step 2) in build first film under the influence of the defeated shifting formwork analog model of douche runner internal particle object, to step 1)
In the douche flow passage structure that is finally inversed by carry out solid, liquid, gas Three-phase Flow simulation, show that douche near wall shearing force is distributed feelings
Condition, as shown in Figure 5.It can be seen from the figure that meeting water in meet water area, heel backwater area, heel of the crown backwater area of runner, crown
There is the position that shearing force is between 0.2~0.4Pa at area, then the position is the position to be optimized easily to block.
4) targeting circular arc optimization is carried out to the position to be optimized being diagnosed to be in step 3).
1/3 (0.33mm) and 1/2 that radius is width of flow path is respectively adopted to crown backwater area and the tooth root area that meets water first
The circular arc optimizing flow passage boundary of (0.50mm), concrete form are as shown in Figure 6.Two different optimization forms are compared (such as Fig. 7 institutes
Show), under the conditions of optimizing R=1/2d using orthodrome, flow is with the coarse side wall contact area of viscosity relative to figure small arc-shaped R=1/
3d biggers, whirlpool development it is more abundant, for the index of discharge and flow stance index reduction advantageously.Simultaneously, turbulent flow is strong
Highest is spent, near wall shearing force is not in the sections 0.2~0.4Pa.
Similarly use radius for the circular arc of 1/3 (0.33mm) of width of flow path and 1/2 (0.50mm) to crown meet water area with
Tooth root backwater area optimizes, and can obtain same conclusions：When being optimized using orthodrome, flow path boundary effect of optimization is more notable.
Fig. 8 gives structure chart and interior shearing force distribution map after optimization, as seen from the figure, the runner knot after optimization
Structure, whirlpool development is the most abundant, and whirlpool rotation is obviously improved near wall flow velocity, scouring capability and particle of the flow near wall
The defeated shifting ability of object is most strong, the self-cleaning ability highest of douche, and it is after douche optimizes to take the structure type after symmetrical treatment
Optimum structure form blocks substance and attachment and deposition least easily occurs, thus its performance of anti-blockage is optimal.
The present invention is only illustrated with above-described embodiment, and structure, installation position and its connection of each component are all can have
Changed, based on the technical solution of the present invention, all improvement that individual part is carried out according to the principle of the invention and equivalent
Transformation, should not exclude except protection scope of the present invention.
Claims (4)
1. a kind of whirlpool for promoting douche performance of anti-blockage washes wall optimization method, include the following steps：
1) by implementing three-dimensional structure scanning to douche, the threedimensional model of its inner flow passage structure is obtained；
2) the quasi- computation model of the defeated shifting formwork of douche runner internal particle object under the influence of the first film of foundation；
3) computation model in step 2) is utilized to be finally inversed by the model of douche runner section under the conditions of first film attachment to step 1)
Solid, liquid, gas Three-phase Flow simulation is carried out, the position to be optimized that may be blocked in runner is diagnosed to be；
4) targeting circular arc optimization is carried out to the position to be optimized being diagnosed to be in step 3), i.e., will uses the side of circular arc between its boundary
Formula connects.
2. a kind of whirlpool for promoting douche performance of anti-blockage as described in claim 1 washes wall optimization method, feature
It is：The process for the computation model that the defeated shifting formwork of douche runner internal particle object is intended under the influence of the first film of foundation in the step 2) is such as
Under：
Filter the big whirlpool equation of momentum such as formula (1) after microvortex：
In view of the influence in the big whirlpool of small vortex pair, the computational methods such as formula (2) of shearing force in formula (1)：
WhereinIt is defined as：
In above-mentioned formula,The respectively component of average speed of the fluid flow rate on the direction i, j；xi、xjRespectively x-axis
Component on the direction i, j；ρ is the fluid density of normal atmosphere pressure,For average water head pressure；μ is viscosity；T is
Time, τijFor sub- grid power；μtFor the sub- grid coefficient of eddy viscosity；For the deformation-rate tensor of scale can be solved；τkkFor shearing force；
δijFor laminar flow layer thickness, LsFor tubulence energy and tubulence energy dissipative shock wave,For deformation-rate tensor matrix determinant；
Collision model when elastic restitution coefficient is 0.5 is chosen, such as formula (5)：
Wherein, U is particulate matter general speed value, and u, v are component of the particulate matter speed in two change in coordinate axis direction of x, y respectively, and f is to rub
Factor is wiped, α is empirical coefficient；
On this basis, consider the power such as additional tension stress, inertia force, gravity, barometric gradient, drag force, buoyancy, Saffman power
It influences, i.e.,：
Wherein, u, v are component of the particulate matter speed in two change in coordinate axis direction of x, y, v respectivelypComponent for speed v in the directions p；
upComponent for speed u in the directions p；P is gross head pressure；ρpIt is the jet density under pressure p；FrFor Froude number；D is
Grain diameter；R is particle radius；ρ is the fluid density of normal atmosphere pressure；G is acceleration of gravity；CDFor empirical coefficient.
3. a kind of whirlpool for promoting douche performance of anti-blockage as claimed in claim 2 washes wall optimization method, feature
It is：In the step 3), the method for performance of anti-blockage position to be optimized is as follows inside diagnostic method douche runner：Using step
The defeated shifting formwork analog model of douche runner internal particle object under the influence of rapid 2) the middle first film built, pours water what is be finally inversed by step 1)
Device flow passage structure carries out solid, liquid, gas Three-phase Flow simulation, obtains douche near wall shearing force distribution situation, diagnoses its boundary
Hydraulic shear whether in control threshold (τ ∈ (0,0.2Pa) ∪ (0.4Pa ,+∞)) range, if its be in (0.2Pa,
Between 0.4Pa), then the position is the position to be optimized that possible block.
4. a kind of whirlpool for promoting douche performance of anti-blockage as claimed in claim 3 washes wall optimization method, feature
It is：Carrying out the method that targeting circular arc optimizes to position to be optimized in the step 4) is：First to crown backwater area and tooth root
It meets water area or the 1/3 and 1/2 circular arc optimizing flow passage that radius is width of flow path is respectively adopted with tooth root backwater area in the crown area that meets water
Boundary in two kinds of optimal ways, selects the scheme that near wall shearing force is not in the sections 0.2~0.4Pa as most
Whole prioritization scheme；If near wall shearing force is not in the sections 0.2~0.4Pa in the case of two kinds, selection whirlpool is selected
Develop more abundant, high 1/2 of turbulence intensity circular arc optimal way as final optimization pass scheme.
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