CN112270143B - Parameterized design method for EGR valve runner - Google Patents
Parameterized design method for EGR valve runner Download PDFInfo
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- CN112270143B CN112270143B CN202011159580.0A CN202011159580A CN112270143B CN 112270143 B CN112270143 B CN 112270143B CN 202011159580 A CN202011159580 A CN 202011159580A CN 112270143 B CN112270143 B CN 112270143B
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- 238000013461 design Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000005457 optimization Methods 0.000 claims abstract description 17
- 238000004458 analytical method Methods 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims description 3
- 238000011161 development Methods 0.000 abstract description 11
- 238000004364 calculation method Methods 0.000 abstract description 4
- 230000018109 developmental process Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The invention discloses a parameterized design method of an EGR valve runner, which comprises the steps of preliminary design, preliminary calculation of flow resistance, judgment of whether the flow resistance requirement is met, completion or next step, definition of optimizable parameters, selection of a plurality of groups of design parameters and size optimization, calculation of flow resistance of a multi-condition flow field, and optimization of size combination meeting the flow resistance requirement. According to the invention, the flow field analysis and the optimization design are integrated, so that the calculation and analysis of a plurality of design schemes can be completed quickly, the development efficiency of the EGR valve is improved, and the development cost is reduced.
Description
Technical Field
The invention relates to the technical field of engine recirculation systems, in particular to a parameterized design method of an EGR valve runner.
Background
An EGR valve (exhaust gas recirculation valve) is an electro-mechanical integrated product mounted on a diesel engine for controlling the amount of exhaust gas recirculation fed back to the intake system. The main function of the EGR valve is to shunt part of exhaust gas discharged by the engine to the air inlet of the engine, so that the exhaust gas is re-mixed with fresh air and then enters the cylinder for combustion, thereby reducing the combustion temperature and reducing the emission of pollutant NOx.
In the development process of the EGR valve, the flow resistance of the flow channel is an important technical index. In early developments, a variety of models and tests were used to screen and refine the EGR valve flow passages and finally set. With the continuous development of Computational Fluid Dynamics (CFD), CFD technology provides a new means for designing and optimizing EGR valve flow paths.
Generally, when an EGR valve flow channel is designed by adopting CFD technology, a process of 'primary design-flow field analysis-optimization design' is necessary to be carried out. In the existing design of the flow passage of the EGR valve, CAD software is adopted to initially design the EGR valve, and a three-dimensional model of the EGR valve is built; calculating the flow resistance of the flow channel by adopting a CFD technology, and if the flow resistance requirement is met, putting into trial production to enter a test stage; if the flow resistance requirement cannot be met, the three-dimensional design and modification of the EGR valve flow passage need to be repeated multiple times. The design mode greatly increases the development period of the EGR valve, and has lower development efficiency.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a parameterized design method of an EGR valve runner, so as to solve the problem that the existing EGR valve development needs to be designed and modified for many times by adopting CAD software and CFD technology, improve the development efficiency of the EGR valve and reduce the development cost.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows.
A parameterized design method of an EGR valve runner comprises the following steps:
s1, performing preliminary design according to arrangement requirements;
s2, carrying out flow field analysis and primarily calculating flow resistance;
s3, judging whether the flow resistance requirement is met;
s4, if the requirements are met, finishing the design, and if the requirements are not met, performing the next step;
s5, defining optimizable parameters;
s6, selecting a plurality of groups of design parameters and performing size optimization;
s7, calculating flow resistance of the multi-working-condition flow field;
and S8, preferably meeting the size combination required by the flow resistance, and completing the design.
In the step S1, preliminary designs of the flow channel inlet diameter D1, the flow channel outlet diameter D3 and the flow channel throat diameter D2 are performed according to the arrangement of the EGR valve and the requirements of the interface.
In the step S2, flow field analysis is carried out by adopting CFD software, and the flow resistance of the initially designed EGR valve is calculated; the flow loss sources of the flow paths are analyzed in the CFD aftertreatment software according to the streamline shape of the EGR valve flow paths.
In a further optimization technical scheme, in the step S5, an EGR valve optimizable parameter is defined in CFD preprocessing software;
the parameters mainly comprise: the EGR valve comprises a runner inlet diameter D1 diameter, a runner outlet diameter D3 diameter, a runner throat diameter D2 diameter, a runner throat height H1, a runner corner chamfer R1, a runner outlet corner R2 and a runner throat chamfer C1.
In the further optimized technical scheme, in the step S6, when the design parameters are selected, the following steps are maintained: the flow channel outlet corner R2 is smaller than the height H1-1mm of the flow channel throat.
In the further optimization technical scheme, in the step S7, flow resistance calculation of a plurality of size optimization working conditions is finished in batches by adopting CFD software.
In a further optimized technical solution, in the step S8, a method for preferably satisfying the size combination required by the design flow resistance is as follows: when a plurality of models meeting the flow resistance requirement exist, the EGR valve model is selected by combining the requirements of the structural strength of the valve body of the EGR valve, the sealing performance of the valve body and the valve core, and the process realizability, so that the optimization of the EGR valve is completed.
By adopting the technical scheme, the invention has the following technical progress.
The parameterized design and optimization of the EGR valve flow channel in the invention are characterized in that the key size of the EGR valve flow channel is represented by parameters instead of definite numerical values, and the size related to the key size is automatically changed by changing design parameters.
Drawings
FIG. 1 is a schematic flow chart of the present invention;
FIG. 2 is a cross-sectional view of an EGR valve of the present invention;
wherein: 1. a runner inlet, 2, a runner outlet, 3 and a runner throat.
Detailed Description
The invention will be described in further detail with reference to the drawings and the specific embodiments.
The parameterized design method of the EGR valve runner is shown in combination with fig. 1 and 2, and comprises the following steps:
s1, preliminary designs of the diameter D1 of the runner inlet 1, the diameter D3 of the runner outlet 2 and the diameter D2 of the runner throat 3 are carried out according to the arrangement of the EGR valve and the requirements of the interface.
S2, carrying out flow field analysis by adopting CFD software, and calculating the flow resistance of the initially designed EGR valve; the flow loss sources of the flow paths are analyzed in the CFD aftertreatment software according to the streamline shape of the EGR valve flow paths.
S3, judging whether the design of the EGR valve meets the flow resistance requirement.
And S4, if the requirements are met, finishing the design, and if the requirements are not met, performing the next step.
S5, defining optimizable parameters of an EGR valve in CFD preprocessing software: the diameter D1 of the runner inlet 1, the diameter D3 of the runner outlet 2, the diameter D2 of the runner throat 3, the height H1 of the runner throat 3, the runner corner chamfer R1, the runner outlet 2 corner R2 and the runner throat 3 chamfer C1.
S6, selecting a plurality of groups of design parameters: if the diameter D1 of the runner inlet 1, the diameter D2 of the runner throat 3 and the diameter D3 of the runner outlet 2 are required by arrangement and interfaces, the optimizable range is smaller or cannot be changed. The four key parameters of the height H1 of the runner throat 3, the runner corner chamfer R1, the runner outlet 2 corner R2 and the runner throat 3 chamfer C1 are parameterized.
And (3) performing size optimization: since the angle R2 > H1 of the flow channel outlet 2 affects the height H1 of the flow channel throat 3, the predefined diameter D2 of the flow channel throat 3 is affected. In selecting the design parameters, hold: the corner R2 of the flow channel outlet 2 is smaller than the height H1-1mm of the throat 3 of the convection channel, so that the diameter of the throat of the flow channel is ensured, and the strength of the valve body at the throat is considered.
And S7, calculating flow resistance of a plurality of size optimization working conditions in batches by adopting CFD software.
And S8, when a plurality of models meeting the flow resistance requirement exist, the EGR valve model is optimized by combining the requirements of the structural strength of the valve body of the EGR valve, the sealing performance of the valve body and the valve core, the process realizability and the like, and the optimization of the EGR valve is completed.
The key parameters of the EGR valve profile in the invention are as follows:
| parameters (parameters) | Meaning of |
| D1 | Flow channel inlet diameter |
| D2 | Diameter of flow channel throat |
| D3 | Diameter of flow channel outlet |
| H1 | Flow channel throat height |
| R1 | Runner corner chamfer |
| R2 | Flow channel outlet corner |
| C1 | Runner throat chamfer |
In practical development, it was found that: according to the EGR valve optimized by the method provided by the invention, after optimization, the flow of the EGR valve is improved by 35% under 5kpa pressure drop.
Claims (1)
1. The parameterized design method of the EGR valve runner is characterized by comprising the following steps of:
s1, performing preliminary design according to arrangement requirements;
in the step S1, preliminary designs of the diameter D1 of the runner inlet (1), the diameter D3 of the runner outlet (2) and the diameter D2 of the runner throat (3) are carried out according to the arrangement of the EGR valve and the requirements of the interface;
s2, carrying out flow field analysis and primarily calculating flow resistance;
carrying out flow field analysis by adopting CFD software, and calculating the flow resistance of the initially designed EGR valve; analyzing flow loss sources of the flow channels according to streamline shapes of the flow channels of the EGR valve in CFD post-processing software;
s3, judging whether the flow resistance requirement is met;
s4, if the requirements are met, finishing the design, and if the requirements are not met, performing the next step;
s5, defining optimizable parameters;
defining an EGR valve optimizable parameter in CFD pre-processing software; the parameters mainly comprise: the diameter D1 of a runner inlet (1), the diameter D3 of a runner outlet (2), the diameter D2 of a runner throat (3), the height H1 of the runner throat (3), a runner corner chamfer R1, a runner outlet (2) corner R2 and a runner throat (3) chamfer C1 of the EGR valve;
s6, selecting a plurality of groups of design parameters and performing size optimization;
in the step S6, when the design parameters are selected, the following steps are maintained: the rotation angle R2 of the flow passage outlet (2) is smaller than the height H1-1mm of the convection passage throat (3);
s7, calculating flow resistance of the multi-working-condition flow field; calculating flow resistance of a plurality of size optimization working conditions in batches by adopting CFD software;
s8, selecting size combinations meeting the flow resistance requirement to finish design; when a plurality of models meeting the flow resistance requirement exist, the EGR valve model is selected by combining the requirements of the structural strength of the valve body of the EGR valve, the sealing performance of the valve body and the valve core, and the process realizability, so that the optimization of the EGR valve is completed.
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| CN113283196B (en) * | 2021-06-03 | 2022-09-30 | 宁波吉利罗佑发动机零部件有限公司 | Method and device for determining engine exhaust gas circulation rate and computer storage medium |
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| CN102777293A (en) * | 2011-05-10 | 2012-11-14 | 通用汽车环球科技运作有限责任公司 | Intake manifold assembly for dedicated exhaust gas recirculation |
| CN102979645A (en) * | 2012-12-14 | 2013-03-20 | 宜宾天瑞达汽车零部件有限公司 | Sealing device applied to EGR (Exhaust Gas Recirculation) valve |
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2020
- 2020-10-27 CN CN202011159580.0A patent/CN112270143B/en active Active
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| CN102777293A (en) * | 2011-05-10 | 2012-11-14 | 通用汽车环球科技运作有限责任公司 | Intake manifold assembly for dedicated exhaust gas recirculation |
| CN102979645A (en) * | 2012-12-14 | 2013-03-20 | 宜宾天瑞达汽车零部件有限公司 | Sealing device applied to EGR (Exhaust Gas Recirculation) valve |
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