CN102542100A - Method and device for acquiring flow uniformity coefficient of three-way catalytic converter - Google Patents
Method and device for acquiring flow uniformity coefficient of three-way catalytic converter Download PDFInfo
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- CN102542100A CN102542100A CN2011104240759A CN201110424075A CN102542100A CN 102542100 A CN102542100 A CN 102542100A CN 2011104240759 A CN2011104240759 A CN 2011104240759A CN 201110424075 A CN201110424075 A CN 201110424075A CN 102542100 A CN102542100 A CN 102542100A
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Abstract
The invention discloses a method and a device for acquiring a flow uniformity coefficient of a three-way catalytic converter and belongs to the technical field of an exhaust system of an automobile engine. The method comprises the following steps of: acquiring a three-dimensional model of the three-way catalytic converter and related parameter values of the three-way catalytic converter; partitioning the three-dimensional model of the three-way catalytic converter; carrying out mesh division on the partitioned three-dimensional model of the three-way catalytic converter to obtain a three-way catalytic converter mesh model; according to the related parameter values of the three-way catalytic converter, adding boundary conditions in the three-way catalytic converter mesh model; and according to flow uniformity coefficient related parameters acquired from the three-way catalytic converter mesh model added with the boundary conditions, calculating to obtain the flow uniformity coefficient of the three-way catalytic converter by utilizing a calculation formula of the flow uniformity coefficient of the three-way catalytic converter. The device comprises an acquiring module, a partitioning module, a meshing module, an adding module and a calculating module. According to the invention, the cost and the time can be saved.
Description
Technical field
The present invention relates to the automobile engine exhaust system technical field, particularly a kind of method and apparatus that obtains ternary catalyzing unit flow uniformity coefficient.
Background technology
Along with the pay attention to day by day to environmental protection, China's automobile emission regulation is also strict day by day, and the harmful gas that how to reduce motor vehicle emission has received concern.At present, mainly be through the harmful gas that ternary catalyzing unit reduces motor vehicle emission is installed in automobile engine exhaust system.And the homogeneity (be called for short ternary catalyzing unit flow uniformity) of gas flow distribution can influence the serviceable life of ternary catalyzing unit and the transformation efficiency of the catalyzer in the ternary catalyzing unit in the ternary catalyzing unit, and to the heat transfer of ternary catalyzing unit inside and chemical reaction also important influence.Therefore, when the design ternary catalyzing unit, ternary catalyzing unit flow uniformity coefficient need be obtained, whether actual needs can be satisfied to judge this ternary catalyzing unit.
At present, when obtaining ternary catalyzing unit flow uniformity coefficient, the method for employing is following: at first, confirm the design proposal of ternary catalyzing unit; Secondly, make the exemplar of ternary catalyzing unit; Then, the exemplar of ternary catalyzing unit is carried out the gas flow distribution uniformity test in the ternary catalyzing unit, obtain the test figure of ternary catalyzing unit flow uniformity.
In realizing process of the present invention, the inventor finds that there is following problem at least in prior art:
Existing method need be made the ternary catalyzing unit exemplar and make an experiment and just can be got access to ternary catalyzing unit flow uniformity coefficient, has wasted a large amount of costs and time.
Summary of the invention
In order to practice thrift cost and time, the embodiment of the invention provides a kind of method and apparatus that obtains ternary catalyzing unit flow uniformity coefficient.Said technical scheme is following:
A kind of method of obtaining ternary catalyzing unit flow uniformity coefficient, said method comprises:
Obtain the related parameter values of the three-dimensional model and the ternary catalyzing unit of ternary catalyzing unit;
Three-dimensional model to said ternary catalyzing unit carries out subregion;
Three-dimensional model to the ternary catalyzing unit behind the subregion is divided grid, obtains ternary catalyzing unit volume mesh model;
According to the related parameter values of said ternary catalyzing unit, in said ternary catalyzing unit volume mesh model, add boundary condition;
Flow uniformity coefficient correlation parameter according to obtaining the ternary catalyzing unit volume mesh model after adding boundary condition utilizes ternary catalyzing unit flow uniformity coefficient formulas, calculates ternary catalyzing unit flow uniformity coefficient.
A kind of device that obtains ternary catalyzing unit flow uniformity coefficient, said device comprises:
Acquisition module is used to obtain the related parameter values of the three-dimensional model and the ternary catalyzing unit of ternary catalyzing unit;
Division module, the three-dimensional model of the ternary catalyzing unit that is used for said acquisition module is obtained carries out subregion;
Divide module, the three-dimensional model of the ternary catalyzing unit behind the subregion that is used for said division module is obtained is divided grid, obtains ternary catalyzing unit volume mesh model;
Add module, be used for related parameter values, in the ternary catalyzing unit volume mesh model that said division module obtains, add boundary condition according to said ternary catalyzing unit;
Computing module; Be used for the flow uniformity coefficient correlation parameter that obtains according to the ternary catalyzing unit volume mesh model behind the interpolation boundary condition that obtains from said interpolation module; Utilize ternary catalyzing unit flow uniformity coefficient formulas, calculate ternary catalyzing unit flow uniformity coefficient.
The beneficial effect of the technical scheme that the embodiment of the invention provides is:
Through the three-dimensional model of the ternary catalyzing unit that obtains and the related parameter values of ternary catalyzing unit; Obtain adding the ternary catalyzing unit volume mesh model behind the boundary condition; According to ternary catalyzing unit flow uniformity coefficient formulas; The flow uniformity coefficient correlation parameter that obtains the ternary catalyzing unit volume mesh model of utilization after adding boundary condition; Can calculate ternary catalyzing unit flow uniformity coefficient, need not make the ternary catalyzing unit exemplar and make an experiment, can practice thrift a large amount of costs and time.
Description of drawings
Fig. 1 is a kind of method flow diagram that obtains ternary catalyzing unit flow uniformity coefficient that the embodiment of the invention 1 provides;
Fig. 2 is a kind of method flow diagram that obtains ternary catalyzing unit flow uniformity coefficient that the embodiment of the invention 2 provides;
Fig. 3 is the subregion synoptic diagram of the three-dimensional model of a kind of ternary catalyzing unit of providing of the embodiment of the invention 2;
Fig. 4 is a kind of ternary catalyzing unit volume mesh illustraton of model that the embodiment of the invention 2 provides;
Fig. 5 is a kind of apparatus structure synoptic diagram that obtains ternary catalyzing unit flow uniformity coefficient that the embodiment of the invention 3 provides;
Fig. 6 is the apparatus structure synoptic diagram that another kind that the embodiment of the invention 3 provides obtains ternary catalyzing unit flow uniformity coefficient.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.
Embodiment 1
Referring to Fig. 1, the embodiment of the invention provides a kind of method of obtaining ternary catalyzing unit flow uniformity coefficient, comprising:
101: the related parameter values of obtaining the three-dimensional model and the ternary catalyzing unit of ternary catalyzing unit.
102: the three-dimensional model to ternary catalyzing unit carries out subregion.
103: the three-dimensional model to the ternary catalyzing unit behind the subregion is divided grid, obtains ternary catalyzing unit volume mesh model.
104:, in ternary catalyzing unit volume mesh model, add boundary condition according to the related parameter values of ternary catalyzing unit.
105: the flow uniformity coefficient correlation parameter according to obtaining the ternary catalyzing unit volume mesh model after adding boundary condition, utilize ternary catalyzing unit flow uniformity coefficient formulas, calculate ternary catalyzing unit flow uniformity coefficient.
Further, the three-dimensional model of ternary catalyzing unit is carried out subregion, specifically comprises:
The three-dimensional model of ternary catalyzing unit is divided into following several zone: the import of ternary catalyzing unit exhaust manifold, the outlet of ternary catalyzing unit exhaust manifold, ternary catalyzing unit exhaust manifold wall, the import of ternary catalyzing unit carrier, the outlet of ternary catalyzing unit carrier and ternary catalyzing unit carrier wall.
Further, the three-dimensional model of the ternary catalyzing unit behind the subregion is divided grid, obtains ternary catalyzing unit volume mesh model, specifically comprise:
Three-dimensional model to the ternary catalyzing unit behind the subregion is divided the veil lattice, obtains ternary catalyzing unit veil lattice model;
Ternary catalyzing unit veil lattice model is divided volume mesh, obtain ternary catalyzing unit volume mesh model.
Further, ternary catalyzing unit flow uniformity coefficient formulas is following:
Wherein, γ representes ternary catalyzing unit flow uniformity coefficient; I is a positive integer, the quantity of the unit that comprises in the expression ternary catalyzing unit volume mesh model; A representes to add the sectional area of ternary catalyzing unit carrier in the ternary catalyzing unit volume mesh model behind the boundary condition; A
iThe area of i unit in the ternary catalyzing unit volume mesh model behind the boundary condition is added in expression; V
iThe axial gas flowing velocity of i unit in the ternary catalyzing unit volume mesh model behind the boundary condition is added in expression;
The mean value of expression axial gas flowing velocity.
Further, calculate after the ternary catalyzing unit flow uniformity coefficient, this method also comprises:
Ternary catalyzing unit flow uniformity coefficient that calculates and preset ternary catalyzing unit flow uniformity coefficient are compared, judge the performance of ternary catalyzing unit according to comparative result.
The described method of obtaining ternary catalyzing unit flow uniformity coefficient of the embodiment of the invention; Through the three-dimensional model of the ternary catalyzing unit that obtains and the related parameter values of ternary catalyzing unit; Obtain adding the ternary catalyzing unit volume mesh model behind the boundary condition; According to ternary catalyzing unit flow uniformity coefficient formulas, utilize the flow uniformity coefficient correlation parameter that obtains the ternary catalyzing unit volume mesh model after adding boundary condition, can calculate ternary catalyzing unit flow uniformity coefficient; Need not make the ternary catalyzing unit exemplar and make an experiment, can practice thrift a large amount of costs and time.Ternary catalyzing unit flow uniformity coefficient and preset ternary catalyzing unit flow uniformity coefficient are compared, can judge the performance of ternary catalyzing unit, improved the efficient of exploitation ternary catalyzing unit according to comparative result.
Referring to Fig. 2, the embodiment of the invention provides a kind of method of obtaining ternary catalyzing unit flow uniformity coefficient, comprising:
201: the related parameter values of obtaining the three-dimensional model and the ternary catalyzing unit of ternary catalyzing unit.
Wherein, The related parameter values of ternary catalyzing unit comprises: 1) ternary catalyzing unit exhaust manifold parameter value: the gas flow L and the temperature of the import of ternary catalyzing unit exhaust manifold; The pressure of ternary catalyzing unit exhaust manifold outlet, the temperature of ternary catalyzing unit exhaust manifold wall (the whole wall of ternary catalyzing unit (comprising ternary catalyzing unit exhaust manifold wall and ternary catalyzing unit carrier wall) is adiabatic).2) ternary catalyzing unit carrier parameter value: ternary catalyzing unit carrier dimensions (the length I (mm (millimeter)) of the sectional area S of ternary catalyzing unit carrier (mm (millimeter)), ternary catalyzing unit carrier); The porosity N of ternary catalyzing unit carrier; Ternary catalyzing unit is at gas with various flow L (L/min (rise/minute)) under crushing Δ p (pa (handkerchief)) (can provide several groups) more; The density p of the air in the ternary catalyzing unit carrier (kg/m^3 (kilograms per cubic meter)), the kinetic viscosity μ of ternary catalyzing unit carrier (kg/sm (Kilograms Per Second rice).
Particularly, can obtain the three-dimensional model of ternary catalyzing unit according to the applicable cases of reality through CAD software designs such as (Computer Aided Design, computer-aided design (CAD)s).And the value of the correlation parameter of ternary catalyzing unit is set according to the applicable cases of reality.
202: the three-dimensional model to ternary catalyzing unit carries out subregion.
Particularly; Referring to Fig. 3, the three-dimensional model with ternary catalyzing unit in the embodiment of the invention is divided into following several zone: ternary catalyzing unit exhaust manifold import (inlet) 1, ternary catalyzing unit exhaust manifold outlet (outlet) 2, ternary catalyzing unit exhaust manifold wall (wall) 3, ternary catalyzing unit carrier import (BC-inlet) 4, ternary catalyzing unit carrier outlet (BC-outlet) 5 and ternary catalyzing unit carrier wall (BC-wall) 6.
203: the three-dimensional model to the ternary catalyzing unit behind the subregion is divided grid, obtains ternary catalyzing unit volume mesh model.
Wherein, Ternary catalyzing unit volume mesh model specifically is made up of the individual hexahedral mesh of i (i is a positive integer) (hexahedral mesh is represented a unit); The concrete value size of i is relevant with the size of the hexahedral mesh of the size of ternary catalyzing unit volume mesh model and setting; Can this not done qualification according to the size of concrete application setting hexahedral mesh.
Particularly, earlier the three-dimensional model of the ternary catalyzing unit behind the subregion is divided the veil lattice, obtain ternary catalyzing unit veil lattice model; Again ternary catalyzing unit veil lattice model is divided volume mesh, obtain ternary catalyzing unit volume mesh model.
Particularly, can divide grid, divide,, be the ternary catalyzing unit volume mesh model that adopts the CFD software demarcation to obtain referring to Fig. 4 as adopting CFD (Computer FluidDynamics, Fluid Mechanics Computation) software through corresponding software.
204:, in ternary catalyzing unit volume mesh model, add boundary condition according to the related parameter values of ternary catalyzing unit.
In the embodiment of the invention, the boundary condition that in ternary catalyzing unit volume mesh model, adds is following: 1) add gas flow and temperature (consistent with corresponding value in the related parameter values) in the import of ternary catalyzing unit exhaust manifold; 2) add pressure (consistent) in the outlet of ternary catalyzing unit exhaust manifold with corresponding value in the related parameter values; 3) add temperature (consistent) at ternary catalyzing unit exhaust manifold wall with corresponding value in the related parameter values; 4) with the import of ternary catalyzing unit carrier, outlet, and pipeline connection formation interface (connection) face that is connected with the import of ternary catalyzing unit carrier, outlet, to guarantee that whole pipe communicates in the ternary catalyzing unit volume mesh model; 5) add adiabatic condition at ternary catalyzing unit carrier wall; 6) the ternary catalyzing unit carrier is regarded as porous medium, in the ternary catalyzing unit carrier, adds inertia resistance alpha and viscous resistance coefficient ζ.
Particularly, when calculating inertia resistance alpha and viscous resistance coefficient ζ, can adopt following method:
Utilize formula
wherein, Δ p representes the crushing of ternary catalyzing unit under gas with various flow L; I representes the length of ternary catalyzing unit carrier; μ representes the kinetic viscosity of ternary catalyzing unit carrier; ρ representes the density of the air in the ternary catalyzing unit carrier; ω representes the gas velocity of ternary catalyzing unit exhaust manifold import; ω=L/ (3600SN ρ); Wherein, L representes the gas flow of ternary catalyzing unit exhaust manifold import, and S representes the sectional area of ternary catalyzing unit carrier; N representes the porosity of ternary catalyzing unit carrier, and ρ representes the density of the air in the ternary catalyzing unit carrier.
Get in the corresponding related data substitution formula (1) of 2 groups of gas with various flow L, obtain the binary quadratic equation group, find the solution this binary quadratic equation group and obtain α, ζ.
205: the flow uniformity coefficient correlation parameter according to obtaining the ternary catalyzing unit volume mesh model after adding boundary condition, utilize ternary catalyzing unit flow uniformity coefficient formulas, calculate ternary catalyzing unit flow uniformity coefficient.
Wherein, ternary catalyzing unit flow uniformity coefficient formulas is following:
Wherein, γ representes ternary catalyzing unit flow uniformity coefficient; I is a positive integer, the quantity of the unit that comprises in the expression ternary catalyzing unit volume mesh model; A representes to add the sectional area of ternary catalyzing unit carrier in the ternary catalyzing unit volume mesh model behind the boundary condition; A
iThe area of i unit in the ternary catalyzing unit volume mesh model behind the boundary condition is added in expression; V
iThe axial gas flowing velocity of i unit in the ternary catalyzing unit volume mesh model behind the boundary condition is added in expression;
The mean value of expression axial gas flowing velocity.
Wherein, A, A
i, V
i,
Relevant with the calculating of ternary catalyzing unit flow uniformity coefficient, can be referred to as flow uniformity coefficient correlation parameter.And, A, A
i, V
iConcrete value can from the ternary catalyzing unit volume mesh model after adding boundary condition, measure,
Can be through calculating all V
iMean value obtain.
206: ternary catalyzing unit flow uniformity coefficient that calculates and preset ternary catalyzing unit flow uniformity coefficient are compared, judge the performance of ternary catalyzing unit according to comparative result.
Wherein, can the concrete value of preset ternary catalyzing unit flow uniformity coefficient be set according to concrete ternary catalyzing unit model and actual application need.
Particularly; In the embodiment of the invention; Ternary catalyzing unit flow uniformity coefficient that calculates and preset ternary catalyzing unit flow uniformity coefficient are compared; If the ternary catalyzing unit flow uniformity coefficient that calculates judges then that greater than preset ternary catalyzing unit flow uniformity coefficient the performance of ternary catalyzing unit is relatively good, can satisfy practical application; Otherwise; If the ternary catalyzing unit flow uniformity coefficient that calculates is smaller or equal to preset ternary catalyzing unit flow uniformity coefficient; The performance of then judging ternary catalyzing unit is poor, cannot satisfy practical application, need be optimized improvement to ternary catalyzing unit.
The described method of obtaining ternary catalyzing unit flow uniformity coefficient of the embodiment of the invention; Through the three-dimensional model of the ternary catalyzing unit that obtains and the related parameter values of ternary catalyzing unit; Obtain adding the ternary catalyzing unit volume mesh model behind the boundary condition; According to ternary catalyzing unit flow uniformity coefficient formulas, utilize the flow uniformity coefficient correlation parameter that obtains the ternary catalyzing unit volume mesh model after adding boundary condition, can calculate ternary catalyzing unit flow uniformity coefficient; Need not make the ternary catalyzing unit exemplar and make an experiment, can practice thrift a large amount of costs and time.Ternary catalyzing unit flow uniformity coefficient and preset ternary catalyzing unit flow uniformity coefficient are compared, can judge the performance of ternary catalyzing unit, improved the efficient of exploitation ternary catalyzing unit according to comparative result.
Referring to Fig. 5, the embodiment of the invention provides a kind of device that obtains ternary catalyzing unit flow uniformity coefficient, and this device comprises:
Add module 304, be used for related parameter values, in the ternary catalyzing unit volume mesh model that division module 303 obtains, add boundary condition according to ternary catalyzing unit;
Further; Division module 302 specifically is used for the three-dimensional model of ternary catalyzing unit is divided into following several zone: the import of ternary catalyzing unit exhaust manifold, the outlet of ternary catalyzing unit exhaust manifold, ternary catalyzing unit exhaust manifold wall, the import of ternary catalyzing unit carrier, the outlet of ternary catalyzing unit carrier and ternary catalyzing unit carrier wall.
Further, dividing module 303 specifically comprises:
First division unit, the three-dimensional model of the ternary catalyzing unit behind the subregion that is used for division module 302 is obtained is divided the veil lattice, obtains ternary catalyzing unit veil lattice model;
Second division unit, the ternary catalyzing unit veil lattice model that is used for first division unit is obtained is divided volume mesh, obtains ternary catalyzing unit volume mesh model.
Further, ternary catalyzing unit flow uniformity coefficient formulas is specially:
Wherein, γ representes ternary catalyzing unit flow uniformity coefficient; I is a positive integer, the quantity of the unit that comprises in the expression ternary catalyzing unit volume mesh model; A representes to add the sectional area of ternary catalyzing unit carrier in the ternary catalyzing unit volume mesh model behind the boundary condition; A
iThe area of i unit in the ternary catalyzing unit volume mesh model behind the boundary condition is added in expression; V
iThe axial gas flowing velocity of i unit in the ternary catalyzing unit volume mesh model behind the boundary condition is added in expression;
The mean value of expression axial gas flowing velocity.
Further, referring to Fig. 6, this device also comprises:
The described device that obtains ternary catalyzing unit flow uniformity coefficient of the embodiment of the invention; Through the three-dimensional model of the ternary catalyzing unit that obtains and the related parameter values of ternary catalyzing unit; Obtain adding the ternary catalyzing unit volume mesh model behind the boundary condition; According to ternary catalyzing unit flow uniformity coefficient formulas, utilize the flow uniformity coefficient correlation parameter that obtains the ternary catalyzing unit volume mesh model after adding boundary condition, can calculate ternary catalyzing unit flow uniformity coefficient; Need not make the ternary catalyzing unit exemplar and make an experiment, can practice thrift a large amount of costs and time.Ternary catalyzing unit flow uniformity coefficient and preset ternary catalyzing unit flow uniformity coefficient are compared, can judge the performance of ternary catalyzing unit, improved the efficient of exploitation ternary catalyzing unit according to comparative result.
All or part of content in the technical scheme that above embodiment provides can realize that through software programming its software program is stored in the storage medium that can read, storage medium for example: the hard disk in the computing machine, CD or floppy disk.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a method of obtaining ternary catalyzing unit flow uniformity coefficient is characterized in that, said method comprises:
Obtain the related parameter values of the three-dimensional model and the ternary catalyzing unit of ternary catalyzing unit;
Three-dimensional model to said ternary catalyzing unit carries out subregion;
Three-dimensional model to the ternary catalyzing unit behind the subregion is divided grid, obtains ternary catalyzing unit volume mesh model;
According to the related parameter values of said ternary catalyzing unit, in said ternary catalyzing unit volume mesh model, add boundary condition;
Flow uniformity coefficient correlation parameter according to obtaining the ternary catalyzing unit volume mesh model after adding boundary condition utilizes ternary catalyzing unit flow uniformity coefficient formulas, calculates ternary catalyzing unit flow uniformity coefficient.
2. the method for obtaining ternary catalyzing unit flow uniformity coefficient according to claim 1 is characterized in that, the three-dimensional model of said ternary catalyzing unit is carried out subregion, specifically comprises:
The three-dimensional model of said ternary catalyzing unit is divided into following several zone: the import of ternary catalyzing unit exhaust manifold, the outlet of ternary catalyzing unit exhaust manifold, ternary catalyzing unit exhaust manifold wall, the import of ternary catalyzing unit carrier, the outlet of ternary catalyzing unit carrier and ternary catalyzing unit carrier wall.
3. the method for obtaining ternary catalyzing unit flow uniformity coefficient according to claim 1 is characterized in that, the three-dimensional model of the ternary catalyzing unit behind the subregion is divided grid, obtains ternary catalyzing unit volume mesh model, specifically comprises:
Three-dimensional model to the ternary catalyzing unit behind the subregion is divided the veil lattice, obtains ternary catalyzing unit veil lattice model;
Said ternary catalyzing unit veil lattice model is divided volume mesh, obtain said ternary catalyzing unit volume mesh model.
4. the method for obtaining ternary catalyzing unit flow uniformity coefficient according to claim 1 is characterized in that, said ternary catalyzing unit flow uniformity coefficient formulas is specially:
Wherein, γ representes ternary catalyzing unit flow uniformity coefficient; I is a positive integer, the quantity of the unit that comprises in the expression ternary catalyzing unit volume mesh model; A representes to add the sectional area of ternary catalyzing unit carrier in the ternary catalyzing unit volume mesh model behind the boundary condition; A
iThe area of i unit in the ternary catalyzing unit volume mesh model behind the boundary condition is added in expression; V
iThe axial gas flowing velocity of i unit in the ternary catalyzing unit volume mesh model behind the boundary condition is added in expression;
The mean value of expression axial gas flowing velocity.
5. according to the described method of obtaining ternary catalyzing unit flow uniformity coefficient of any claim of claim 1-4, it is characterized in that calculate after the ternary catalyzing unit flow uniformity coefficient, said method also comprises:
Ternary catalyzing unit flow uniformity coefficient that calculates and preset ternary catalyzing unit flow uniformity coefficient are compared, judge the performance of ternary catalyzing unit according to comparative result.
6. a device that obtains ternary catalyzing unit flow uniformity coefficient is characterized in that, said device comprises:
Acquisition module is used to obtain the related parameter values of the three-dimensional model and the ternary catalyzing unit of ternary catalyzing unit;
Division module, the three-dimensional model of the ternary catalyzing unit that is used for said acquisition module is obtained carries out subregion;
Divide module, the three-dimensional model of the ternary catalyzing unit behind the subregion that is used for said division module is obtained is divided grid, obtains ternary catalyzing unit volume mesh model;
Add module, be used for related parameter values, in the ternary catalyzing unit volume mesh model that said division module obtains, add boundary condition according to said ternary catalyzing unit;
Computing module; Be used for the flow uniformity coefficient correlation parameter that obtains according to the ternary catalyzing unit volume mesh model behind the interpolation boundary condition that obtains from said interpolation module; Utilize ternary catalyzing unit flow uniformity coefficient formulas, calculate ternary catalyzing unit flow uniformity coefficient.
7. the device that obtains ternary catalyzing unit flow uniformity coefficient according to claim 6; It is characterized in that; Said division module specifically is used for the three-dimensional model of said ternary catalyzing unit is divided into following several zone: the import of ternary catalyzing unit exhaust manifold, the outlet of ternary catalyzing unit exhaust manifold, ternary catalyzing unit exhaust manifold wall, the import of ternary catalyzing unit carrier, the outlet of ternary catalyzing unit carrier and ternary catalyzing unit carrier wall.
8. the device that obtains ternary catalyzing unit flow uniformity coefficient according to claim 6 is characterized in that, said division module specifically comprises:
First division unit, the three-dimensional model of the ternary catalyzing unit behind the subregion that is used for said division module is obtained is divided the veil lattice, obtains ternary catalyzing unit veil lattice model;
Second division unit, the ternary catalyzing unit veil lattice model that is used for said first division unit is obtained is divided volume mesh, obtains said ternary catalyzing unit volume mesh model.
9. the device that obtains ternary catalyzing unit flow uniformity coefficient according to claim 6 is characterized in that, said ternary catalyzing unit flow uniformity coefficient formulas is specially:
Wherein, γ representes ternary catalyzing unit flow uniformity coefficient; I is a positive integer, the quantity of the unit that comprises in the expression ternary catalyzing unit volume mesh model; A representes to add the sectional area of ternary catalyzing unit carrier in the ternary catalyzing unit volume mesh model behind the boundary condition; A
iThe area of i unit in the ternary catalyzing unit volume mesh model behind the boundary condition is added in expression; V
iThe axial gas flowing velocity of i unit in the ternary catalyzing unit volume mesh model behind the boundary condition is added in expression;
The mean value of expression axial gas flowing velocity.
10. according to the described device that obtains ternary catalyzing unit flow uniformity coefficient of any claim of claim 6-9, it is characterized in that said device also comprises:
Comparison module, the ternary catalyzing unit flow uniformity coefficient that is used for said computing module is calculated compares with preset ternary catalyzing unit flow uniformity coefficient, judges the performance of ternary catalyzing unit according to comparative result.
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| CN104281744A (en) * | 2014-09-26 | 2015-01-14 | 安徽江淮汽车股份有限公司 | Method for analyzing engine catalyst |
| CN104732015A (en) * | 2015-02-27 | 2015-06-24 | 柳州职业技术学院 | Simulation analysis method for analyzing ternary catalytic converter based on CFD technology |
| CN106055840A (en) * | 2016-06-30 | 2016-10-26 | 重庆长安汽车股份有限公司 | Three-way catalytic converter lectotype design method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104281744A (en) * | 2014-09-26 | 2015-01-14 | 安徽江淮汽车股份有限公司 | Method for analyzing engine catalyst |
| CN104732015A (en) * | 2015-02-27 | 2015-06-24 | 柳州职业技术学院 | Simulation analysis method for analyzing ternary catalytic converter based on CFD technology |
| CN104732015B (en) * | 2015-02-27 | 2017-11-03 | 柳州职业技术学院 | A kind of analog analysing method based on CFD technical Analysis three-way catalytic converters |
| CN106055840A (en) * | 2016-06-30 | 2016-10-26 | 重庆长安汽车股份有限公司 | Three-way catalytic converter lectotype design method |
| CN106055840B (en) * | 2016-06-30 | 2019-03-22 | 重庆长安汽车股份有限公司 | A kind of design method of ternary catalyzing unit type selecting |
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| CN102542100B (en) | 2014-01-22 |
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