CN102880757A - Micro-irrigation pressure adjuster design method based on fluid-solid coupling numerical calculation - Google Patents
Micro-irrigation pressure adjuster design method based on fluid-solid coupling numerical calculation Download PDFInfo
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- CN102880757A CN102880757A CN2012103707782A CN201210370778A CN102880757A CN 102880757 A CN102880757 A CN 102880757A CN 2012103707782 A CN2012103707782 A CN 2012103707782A CN 201210370778 A CN201210370778 A CN 201210370778A CN 102880757 A CN102880757 A CN 102880757A
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Abstract
The invention discloses a micro-irrigation pressure adjuster design method based on fluid-solid coupling numerical calculation. The method includes: adopting CAD (computer-aided design) software to establish a fluid area parametric geometric model and an adjusting component geometric model in a micro-irrigation pressure adjuster according to design requirements of the micro-irrigation pressure adjuster; respectively guiding fluid and the adjusting component CAD model into corresponding fluid and structure calculation module in ADINA of the CAD software, and setting boundary conditions and solving control parameters for fluid-solid coupling numerical calculation; timely performing grid reconfiguration during the numerical calculation to guarantee quality of grid calculated, adjusting geometric model parameters according to calculation results until the calculation results meet design accuracy requirements, and making quick forming testing parts for pressure adjusting performance tests; and comparing test results with design requirements, and modifying models or finishing design. The micro-irrigation pressure adjuster design method based on fluid-solid coupling numerical calculation overcomes defects of long development circle, high cost and the like in conventional design, so that design accuracy and efficiency of the micro-irrigation pressure adjuster are improved.
Description
Technical field
The present invention relates to a kind of method for designing of slight irrigation pressure governor, particularly a kind of method of utilizing the slight irrigation pressure governor rapid Design of the solid Coupled Numerical computing technique realization of stream.
Background technology
Pressure governor is one of main voltage adjusting device in the present irrigation system, and when intake pressure changed, its runner automatically became large or diminishes, and made top hole pressure keep stable.That pressure governor has is simple in structure, range of adjustment is wide, the characteristics of stable performance, usually be installed in slight irrigation engineering arm or hollow billet import, every arm or hollow billet intake pressure head are equated, reduced calculating loaded down with trivial details when designing, simplified design of pipe networks, improved the irrigation system uniformity of irrigation water appilcation, and guaranteed that each bar drip irrigation zone all works in the design effort pressure limit. avoided the excessive drip irrigation zone Decrepitation Phenomena that causes of pressure that causes because designing the factors such as improper or misoperation, prolong the serviceable life of drip irrigation project, ensured security of system.Mostly slight irrigation pressure governor on the market is that adjusting part moves axially in the cavity by regulating under hydraulic pressure now, changes runner flow section size and plays the effect that adjusts mouth pressure.Wherein adjusting part move axially and fluid motion between exist stronger Dynamics Coupling relation, use traditional CFD analytical approach to be difficult to obtain slight irrigation pressure governor inner fluid dynamic flow characteristic.
Traditional slight irrigation pressure governor design, the main CFD of employing calculates the method with the experiment combination, the axial deflection of adjusting part, the relation of inlet and outlet pressure are not easy to arrive exactly, the model pre-estimating resultant error is larger, model parameter mainly relies on the physical member experiment, and by experiment is finally to product approval repeatedly, it is large to design and develop blindness, construction cycle is long, and development cost is high.
Summary of the invention
Defective or deficiency for above-mentioned prior art exists the object of the invention is to, and propose a kind of slight irrigation pressure governor method for designing of calculating based on the solid Coupled Numerical of stream.
In order to realize above-mentioned task, the technical solution used in the present invention is:
A kind of slight irrigation pressure governor method for designing of calculating based on the solid Coupled Numerical of stream, it is characterized in that, at first according to the designing requirement of slight irrigation pressure governor, adopt CAD software to set up fluid mass Parametric geometric model and adjusting part geometric model in the slight irrigation pressure governor.Then fluid and adjusting part cad model are imported respectively corresponding fluid and structural calculation module among the CAE software ADINA, conditions setting and find the solution the control parameter after, flow solid Coupled Numerical and calculate; In numerical procedure, carry out grid reconstruction to guarantee the quality of computing grid in good time, adjust the geometric model parameter according to result of calculation, until result of calculation satisfies design accuracy require after, produce the rapid shaping testpieces, carry out the pressure regulating performance experiment, if experimental result and designing requirement deviation are in design accuracy requires allowed band, then complete design is not then revised model if do not satisfy.
The method has overcome the coupling that CFD calculates ignorance fluid and adjusting part in traditional slight irrigation pressure governor design, model parameter mainly relies on estimation, and then by experiment is definite repeatedly, construction cycle is long, the shortcoming that development cost is high has significantly improved design accuracy and the efficient of slight irrigation pressure governor.
Description of drawings
Fig. 1 is the technology of the present invention route map;
Fig. 2 is structure and the calculation of boundary conditions synoptic diagram of slight irrigation pressure governor example model of the present invention; Mark among the figure represents respectively: 1, pressure inlets, 2, the solid coupling surface of stream, 3, contact position.4, pressure export.
Fig. 3 is slight irrigation pressure governor fluid domain geometric model figure of the present invention;
Fig. 4 is slight irrigation pressure governor fluid domain grid model figure of the present invention;
Fig. 5 is adjusting part of the present invention and contact wall geometric model figure;
Fig. 6 is adjusting part of the present invention and contact wall grid model figure;
Fig. 7 is that the present invention regulates cavity region and moves axially the fluid deformation grid sections figure that causes of distortion by adjusting part;
Fig. 8 is that the present invention regulates cavity region fluid grid and heavily divides rear sectional view.
Below in conjunction with accompanying drawing the present invention is described in further detail.
Embodiment
Referring to Fig. 1, present embodiment provides a kind of slight irrigation pressure governor method for designing of calculating based on the solid Coupled Numerical of stream, and its main design procedure is as follows:
1) at first according to the designing requirement of slight irrigation pressure governor, adopt CAD software to set up the adjusting part geometric model of fluid mass Parametric geometric model and solid area in the slight irrigation pressure governor;
2) then cad model is imported among the CAE software ADINA, after setting the boundary condition identical with actual condition and finding the solution the control parameter, flow solid Coupled Numerical and calculate;
3) adjust the geometric model parameter according to result of calculation, until result of calculation and designing requirement deviation require in design accuracy 10% within, produce the rapid shaping testpieces, carry out pressure regulating performance and test;
4) contrast pressure regulating performance experimental result and designing requirement, if experimental result and designing requirement deviation design accuracy require 10% within, if complete design then is the satisfied adjusting part geometric model of then not revising.
Below provide its specific design process of the method:
(1) geometric model is set up
Tentatively determine slight irrigation pressure governor structural parameters according to the designing requirement of slight irrigation pressure governor, namely use CAD software to set up respectively slight irrigation pressure governor fluid mass geometric model and adjusting part geometric model, and guarantee that the fluid mass is consistent with the coordinate of solid area; Because adjusting part axially-movable distortion is larger on the impact of slight irrigation pressure governor serviceability, and the set pressure of spring is the key factor that has determined pressure regulation power, contact so set up with the contact portion of shell wall side at adjusting part.
The structure of slight irrigation pressure governor example model and calculation of boundary conditions synoptic diagram as shown in Figure 2, the slight irrigation pressure governor is set up fluid model as shown in Figure 3.
(2) model imports and is discrete
Fluid domain and adjusting part geometric model are imported respectively corresponding fluid and structural calculation module among the CAE software for calculation ADINA, and the material parameter of fluid, adjusting part is set respectively, the fluid major parameter is incompressible viscous fluid, density 1000kg/m
3, kinetic viscosity 0.001Ns/m
2, turbulence model is selected K-ε high reynolds number turbulence model.Adjusting part adopts the associated materials model, determines model parameter and Poisson ratio μ according to material therefor, the used adjusting part density of material of the design 2000kg/m
3, Poisson ratio μ is 0.3.The contact wall model adopts the surface how much that sets up in ADINA software, and is made as rigid contact surfaces.
It is discrete to carry out geometry in ADINA software, grid division.Fluid model adopts 4 node tetrahedral grid mesh discretizations, and grid as shown in Figure 4.The adjusting part model adopts 8 node hexahedral mesh mesh discretizations, and the contact wall model adopts 4 node surface grids, and adjusting part and contact wall grid are as shown in Figure 5;
(3) boundary condition setting
Fluid analysis adopts pressure entrance (position shown in 1 among Fig. 2) and exit condition, and the top hole pressure value is atmospheric pressure, position shown in 4 among reference value 0kPa(Fig. 2), fluid-adjusting part interface is for flowing the border (position shown in 2 among Fig. 2) that admittedly is coupled.Consider the not intellectual of contact analysis in the structure field, the transient state method for solving that adopts process of iteration to combine with method of addition, porch pressure progressively increment load.The controlled pressure heap(ed) capacity to avoid the excessive mesh overlay that causes of adjusting part distortion, guarantees computational convergence simultaneously.Adjusting part and shell wall side surface of contact are Contact Boundary (position shown in the mark 3 among Fig. 2), and friction factor is recorded by experiment, and adjusting part-fluid interface is for flowing the border (position shown in the mark 2 among Fig. 2) that admittedly is coupled.
(4) the solid Coupled Numerical of stream calculates
The solid coupling of stream adopts the iteration coupling analytical method, and governing equation is found the solution and adopted complete Newton iteration method, and displacement and pressure convergence criterion---relative residual error is less than 1 * 10
-5The fluid governing equation is found the solution the employing Finite Volume Method, adopts second order composite time integral form, adopts the simple Algorithm for Solving, the variable convergence criterion---and residual error is less than 1 * 10 relatively
-5Solid analysis adopts the implicit expression method of dynamic analysis, and Finite Element Method is discrete, second order accuracy Bathe composite time integral form, and Newton iteration method is calculated fully, the displacement convergence criterion---and residual error is less than 1 * 10 relatively
-5, constraint function algorithm is adopted in adjusting part and the analysis of wall Contact.
(5) adaptive mesh reconstruct with restart analysis
Axially-movable distortion (such as Fig. 6) occurs in adjusting part under fluid pressure action, thereby causes the change of fluid geometric configuration and cause fluid mesh distortion (such as Fig. 7).Fluid grid distorted can affect computational convergence, and when mesh distortion caused coupling calculating not restrain within 50 steps, termination of computations was carried out the fluid domain grid reconstruction, and the fluid grid as shown in Figure 8 after the reconstruct.Result before the termination of computations is applied on the new grid model after the reconstruct as starting condition, returned for the 5th step and continue the solid Coupled Numerical of stream and calculate, until the inlet pressure value that loads reaches required pressure.
(6) aftertreatment
Top hole pressure corresponding to the different inlet pressures of statistics after calculating is finished, draw the inlet and outlet pressure relation curve, and compare with designing requirement: if result of calculation and designing requirement deviation require then to finish calculating within 10% in design accuracy, carry out the work of the 7th step; Otherwise return the first step, revise model parameter and recomputate until meet design requirement, and record finished model parameter and the result of calculation of calculating, provide foundation for revising model parameter.
(7) Quick formed part is made
Determined slight irrigation pressure governor structural parameters are calculated in solid coupling according to stream, make its rapid shaping experimental piece, and finish the experimental piece assembling.
(8) pressure regulating performance experiment
With the experimental piece access slight irrigation pressure governor combination property bench of making, test.Experimental result and designing requirement are compared, according to the result slight irrigation pressure governor model parameter is made amendment, turn back to the first step and recomputate, until experimental result and designing requirement deviation are finished slight irrigation pressure governor fast shaping in design accuracy requires allowed band.
Claims (2)
1. a slight irrigation pressure governor method for designing of calculating based on the solid Coupled Numerical of stream is characterized in that, follows these steps to design:
1) at first according to the designing requirement of slight irrigation pressure governor, adopt CAD software pro/e to set up the adjusting part geometric model of fluid mass Parametric geometric model and solid area in the slight irrigation pressure governor;
2) then cad model is imported among the CAE software ADINA, after setting the boundary condition identical with actual condition and finding the solution the control parameter, flow solid Coupled Numerical and calculate;
3) adjust the geometric model parameter according to the solid Coupled Numerical result of calculation of stream, until result of calculation and designing requirement deviation design accuracy require 10% within, produce the rapid shaping testpieces, carry out pressure regulating performance and test;
4) contrast pressure regulating performance experimental result and designing requirement, if experimental result and designing requirement deviation design accuracy require 10% within, if complete design then is the satisfied model of then not revising.
2. the method for claim 1 is characterized in that, the specific design step is as follows:
1) geometric model is set up
Tentatively determine slight irrigation pressure governor structural parameters according to the designing requirement of slight irrigation pressure governor, namely use CAD software to set up respectively the adjusting part geometric model of slight irrigation pressure governor fluid domain geometric model and solid area, and guarantee that the fluid mass is consistent with the coordinate of solid area;
2) model imports and is discrete
Fluid domain and adjusting part geometric model are imported respectively corresponding fluid and structural calculation module among the CAE software for calculation ADINA, and the material parameter of fluid, adjusting part is set respectively, fluid is incompressible viscous fluid, density 1000kg/m
3, kinetic viscosity 0.001Ns/m
2, turbulence model is selected K-ω high reynolds number turbulence model; Adjusting part adopts isotropic linear elastic material material model, determines model parameter according to material therefor, and the adjusting part density of material is 2000kg/m
3, Poisson ratio μ is 0.3, determines that the contact wall model adopts contact boundary condition, carries out geometry and disperses grid division in ADINA software; Fluid model adopts 4 node tetrahedral grid mesh discretizations; Solid model adopts 8 node hexahedral mesh mesh discretizations, and the contact wall model adopts 4 node surface grids discrete;
3) boundary condition setting
Fluid analysis adopts pressure entrance and exit condition, and the top hole pressure value is atmospheric pressure, and the relative pressure value is 0.Fluid-adjusting part interface is for flowing the border that admittedly is coupled; Consider the not intellectual of contact analysis in the structure field, select method for solving, porch pressure form, the transient state method for solving that adopts process of iteration to combine with method of addition; Determine boundary condition, the friction factor of adjusting part and shell wall side surface of contact and flow the border that admittedly is coupled;
4) the solid Coupled Numerical of stream calculates
The solid coupling of stream adopts the iteration coupling analytical method, and governing equation is found the solution and adopted complete Newton iteration method, and displacement and pressure convergence criterion---relative residual error is less than 1 * 10
-5, the fluid governing equation is found the solution the employing Finite Volume Method, and form is selected the second order spatial spreading, and time integral adopts second order composite Integration Scheme, finds the solution and adopts the simple algorithm, the variable convergence criterion---and residual error is less than 1 * 10 relatively
-5, solid analysis adopts the implicit expression method of dynamic analysis, and Finite Element Method is discrete, and Newton iteration method is calculated fully, the displacement convergence criterion---and residual error is less than 1 * 10 relatively
-5, contact analysis adopts constraint function algorithm;
5) adaptive mesh reconstruct with restart analysis
Axially-movable distortion occurs in adjusting part under fluid pressure action, thereby causes the change of fluid geometric configuration and cause the fluid mesh distortion; Fluid grid distorted can affect computational convergence, therefore needs to determine suitable calculating step number, and this paper was set to for 50 steps, if do not restrain, termination of computations is carried out the fluid domain grid reconstruction;
Result before the termination of computations is applied on the new grid model after the reconstruct as starting condition, returned for the 5th step and continue the solid Coupled Numerical of stream and calculate, until the inlet pressure value that loads reaches required pressure;
6) aftertreatment
Top hole pressure corresponding to the different inlet pressures of statistics after calculating is finished drawn the inlet and outlet pressure relation curve, and compares with designing requirement:
If result of calculation and designing requirement deviation design accuracy require 10% within, then finish calculating, carry out the work of the 7th step; Otherwise return the first step, revise model parameter and recomputate until meet design requirement, and record finished model parameter and the result of calculation of calculating, provide foundation for revising model parameter;
7) Quick formed part is made
Determined slight irrigation pressure governor structural parameters are calculated in solid coupling according to stream, make its rapid shaping experimental piece, and finish the experimental piece assembling;
8) pressure regulating performance experiment
With the experimental piece access slight irrigation pressure governor combination property bench of making, test, and experimental result and designing requirement are compared, determine whether to finish the design of slight irrigation pressure governor fast shaping.
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| CN104794356A (en) * | 2015-04-28 | 2015-07-22 | 河海大学 | Wind resistance analysis method of high-rise ship lift tower column structure |
| CN105205269A (en) * | 2015-09-25 | 2015-12-30 | 宝鸡石油钢管有限责任公司 | Analysis method for predicting fluid-solid interaction characteristics of special threaded connector oil casing |
| CN105653783A (en) * | 2015-12-28 | 2016-06-08 | 哈尔滨工业大学 | Method for improving fluid-solid coupling calculation precision of composite material propeller |
| CN106396078A (en) * | 2016-06-24 | 2017-02-15 | 中国科学院重庆绿色智能技术研究院 | A constructing method of a biological process system concentration field |
| CN109711017A (en) * | 2018-12-14 | 2019-05-03 | 国网陕西省电力公司电力科学研究院 | A kind of micro-inertia device pipe range Hydraulic Design Method based on flow deviational coefficient |
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| CN104794356B (en) * | 2015-04-28 | 2017-07-18 | 河海大学 | A kind of towering shiplifter tower structure Wind resistant analysis method |
| CN105205269A (en) * | 2015-09-25 | 2015-12-30 | 宝鸡石油钢管有限责任公司 | Analysis method for predicting fluid-solid interaction characteristics of special threaded connector oil casing |
| CN105205269B (en) * | 2015-09-25 | 2018-05-15 | 宝鸡石油钢管有限责任公司 | A kind of analysis method for predicting Special threading connector tubing and casing fluid structurecoupling characteristic |
| CN105653783A (en) * | 2015-12-28 | 2016-06-08 | 哈尔滨工业大学 | Method for improving fluid-solid coupling calculation precision of composite material propeller |
| CN106396078A (en) * | 2016-06-24 | 2017-02-15 | 中国科学院重庆绿色智能技术研究院 | A constructing method of a biological process system concentration field |
| CN111191390A (en) * | 2018-10-26 | 2020-05-22 | 中国航发商用航空发动机有限责任公司 | Part modeling method and device with concave part on surface and electronic device |
| CN111191390B (en) * | 2018-10-26 | 2023-09-01 | 中国航发商用航空发动机有限责任公司 | Method and equipment for modeling part with concave part on surface and electronic equipment |
| CN109711017A (en) * | 2018-12-14 | 2019-05-03 | 国网陕西省电力公司电力科学研究院 | A kind of micro-inertia device pipe range Hydraulic Design Method based on flow deviational coefficient |
| CN109711017B (en) * | 2018-12-14 | 2022-09-27 | 国网陕西省电力公司电力科学研究院 | Micro-irrigation capillary pipe length hydraulic design method based on flow deviation coefficient |
| CN111062141A (en) * | 2019-12-29 | 2020-04-24 | 浪潮商用机器有限公司 | Computer component vibration degree prediction method, device and medium |
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