CN105930597A - Porous fuel injector and design method therefor - Google Patents
Porous fuel injector and design method therefor Download PDFInfo
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- CN105930597A CN105930597A CN201610269737.2A CN201610269737A CN105930597A CN 105930597 A CN105930597 A CN 105930597A CN 201610269737 A CN201610269737 A CN 201610269737A CN 105930597 A CN105930597 A CN 105930597A
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- atomizer
- perforated plate
- plate type
- injection process
- type atomizer
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000013461 design Methods 0.000 title claims abstract description 30
- 239000000446 fuel Substances 0.000 title claims abstract description 13
- 238000004088 simulation Methods 0.000 claims abstract description 37
- 238000002347 injection Methods 0.000 claims abstract description 33
- 239000007924 injection Substances 0.000 claims abstract description 33
- 230000008569 process Effects 0.000 claims abstract description 29
- 238000005457 optimization Methods 0.000 claims abstract description 7
- 238000002474 experimental method Methods 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 claims description 2
- 230000004044 response Effects 0.000 claims description 2
- 238000012360 testing method Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 239000012530 fluid Substances 0.000 abstract description 5
- 238000000889 atomisation Methods 0.000 abstract description 4
- 239000002912 waste gas Substances 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 17
- 238000005507 spraying Methods 0.000 description 7
- 239000000295 fuel oil Substances 0.000 description 6
- 238000011160 research Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 238000012827 research and development Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 241001212789 Dynamis Species 0.000 description 1
- -1 atomizing effect Substances 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
- G06F30/367—Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Engines (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
The present invention provides a design method for a porous fuel injector. The method comprises: S1. based on CFD software, establishing a model of fuel-injection process simulation of a porous fuel injector; and S2. based on the model of fuel-injection process simulation of the porous fuel injector, performing optimization design on the porous fuel injector. Based on a design flow guided by computational fluid dynamics CFD (Computational Fluid Dynamics), the present invention develops a novel gasoline engine porous fuel injector model, which can achieve the best fuel injection and atomization effect and reduce waste gas emission.
Description
Technical field
The present invention relates to Gasoline engine developments field, specifically, relate to a kind of perforated plate type atomizer and
Method for designing.
Background technology
The design of petrol engine atomizer in the market is based primarily upon industry experience, uses simple thing
Reason experimental technique drives design and the optimization of atomizer.This method for designing needs the research and development week grown very much
Phase, the R & D Cost of great number, can only be analyzed by minority measurement indexes such as the distributive values in the unit interval
With instruct research and development, the atomizer of flowing and states of matter change after and ejection internal at to(for) fuel oil are difficult to observation,
More can not quantitative analysis.Such as, current industrial quarters and academia are for the reason of atomizer inside cavitation phenomenons
Solve the most extremely limited, and cavitation phenomenons on fuel flow, be atomized and the impact burnt is the hugest.Cause
This, traditional atomizer designs through development for many years, for the lifting ten of fuel-oil atmozation and efficiency of combustion
Divide limited.The exploitation of high-precision simulation numerical algorithm and high performance CFD simulation software provides for us
The instrument of a kind of brand-new research atomizer performance, its simulation result can reboot the most again spray
The design of oil nozzle and optimization.
The CFD simulation software of main flow has been able to comprise the calculation of major part simulation atomizer injection process at present
Method.However, it should use which kind of phantom, and these relate to liquid flowing, the thing of gasification of fuel oil
Reason model and carry out numerical computations mathematical model this how to coordinate, thus carry out CFD correct, reliable
Emulation, industrial quarters is also unable to decide which is right.
The part achievement in research that the present invention has published based on academia and industrial quarters, develops a set of
Completely, reliable CFD simulation flow, including wherein involved various mathematical modeies and physical model
Arrange, defined the theory and technology basis of the present invention.
Summary of the invention
The present invention provides a kind of perforated plate type atomizer and method for designing thereof, to be solved technical problem is how
Design and the problem of optimization of atomizer is driven with simple physical experimental method.
The technical scheme is that
The present invention provides the method for designing of a kind of perforated plate type atomizer, including:
S1, sets up perforated plate type atomizer simulation injection process model based on CFD software；
S2, carries out the optimization design of perforated plate type atomizer based on perforated plate type atomizer simulation injection process model.
Preferably, being implemented as of S1: the structure of perforated plate type atomizer simulation injection process model and porous
The checking of atomizer simulation injection process model.
Preferably, the structure of described perforated plate type atomizer simulation injection process model comprises the following steps:
S1-1-1, choose the required CFD model used of perforated plate type atomizer simulation injection process and arrange；
S1-1-2, by the perforated plate type atomizer chosen simulation injection process model carry out stress and strain model；
Preferably, the checking of described perforated plate type atomizer simulation injection process model comprises the following steps:
S1-2-1, carrying out Physical Experiment based on the design of existing atomizer, the experiment that record obtains is measured
As a result, as the basis of checking simulation result reliability；
S1-2-2, according to above-mentioned Physical Experiment, the input quantity needed for determining injection process and described input quantity
Corresponding output；
S1-2-3, the perforated plate type atomizer simulation spray input quantity obtained in previous step imported in S1-1-2
Oil process model grid, and carry out CFD calculating, and the output result needed for record, obtain CFD and calculate
Result；
S1-2-4, comparative experiments measurement result and CFD result of calculation, determine that CFD calculates and the most correctly may be used
Lean on, be, obtain reliable perforated plate type atomizer simulation injection process model；No, adjust modelling and lay equal stress on
Multiple step S1.
Preferably, being implemented as of S2:
S2-1, based on have verified that for reliable perforated plate type atomizer simulate injection process model, to more
Atomizer design carries out CFD calculating；
S2-2, the result that above-mentioned CFD calculates is formed corresponding curve chart and the response surface figure；
S2-3, the result calculated based on above-mentioned CFD, comprehensive analysis show that the optimum structure of atomizer sets
Meter.
The present invention has the beneficial effects that: based on computation fluid dynamics (Computational Fluid
Dynami cs) guide design cycle, have developed a novel petrol engine perforated plate type atomizer model,
The fuel oil that can reach best sprays, atomizing effect, drops low exhaust gas emission.The design master of perforated plate type atomizer
Relate to three geometric parameters, nozzle length, tapering and deflection angle.Different groups of these geometric parameters
Crossed belt carrys out different nozzle designs can be with extreme influence gasoline in the flowing within atomizer, the effect of injection
Really, and finally the atomizing effect of gasoline, efficiency of combustion and waste gas discharge are affected.At this R & D of complex
In, by different atomizer designs is carried out Fluid Mechanics Computation simulation calculation, simulate and analyze oil spout
The multinomial performance index of the oil spout of mouth, thus analyze this three respective impacts of geometric parameter, infer them
Each change is the variation tendency of oil spout effect, both can be as the reference of following atomizer design with refer to
Lead, it is also possible to draw the parameter combination of optimum, thus invent the design of this money new and effective atomizer.
The invention still further relates to a kind of perforated plate type atomizer, the method for designing of claim 1-5 design and draw,
Including oil injector body, needle-valve and at least one atomizer, described oil injector body is set in needle-valve, described
Atomizer is connected on needle-valve, and described atomizer is multiple, forms hydraulic oil between needle-valve and oil injector body
Road, controls pressing valve under needle valve spring by electromagnetic valve, by gasoline force feed to becoming 120 angles symmetrically and evenly
The atomizer ejection of distribution, forms spraying, with air mixing after-combustion.
Preferably, described atomizer is 3, and the tapering CF of each described atomizer is-10, length system
Number L/D is 1.0 and deflection angle B is 35 °.
The invention has the beneficial effects as follows: the design of this atomizer can be that gasoline is scattered at nozzle exit
More open, form bigger preferably spraying, in order to gasoline is more abundant with the oxygen mix in combustor,
Thus burn more abundant, improve fuel oil utilization ratio, drop low exhaust gas emission.
Accompanying drawing explanation
Fig. 1 is the atomizer structural model of the present invention；
Fig. 2 is the atomizer geometric parameter explanation of the present invention；
Fig. 3 is the atomizer CFD phantom of the present invention.
Detailed description of the invention
Being described principle and the feature of the present invention below in conjunction with accompanying drawing, example is served only for explaining this
Invention, is not intended to limit the scope of the present invention.
Being described principle, step and the feature of the present invention below in conjunction with accompanying drawing, example is served only for
Explain the present invention, be not intended to limit the scope of the present invention.
Based on the technical foundation before the present invention it is known that nozzle length, tapering and deflection angle are to spray
The oil spout efficiency of oil nozzle, fuel flow situation impact huge, therefore the present invention also from these three parameter set about into
Row design and optimization.The atomizer structural representation of the present invention as it is shown in figure 1, include oil injector body 1,
Needle-valve 2 and atomizer 3, form high-pressure oil duct, by electromagnetic valve control between needle-valve 2 and oil injector body 1
Pressing valve 2 under needle valve spring processed, by gasoline force feed to the atomizer 3 becoming 120 angles to be distributed symmetrically and evenly
Ejection, forms spraying, with air mixing after-combustion.
Because the 3 of atomizer nozzle designs are symmetrical, in order to save simulation time and resource, only
Wherein 1/3rd models are modeled and emulate, as shown in Figure 3.Atomizer structure 3 in Fig. 3
The part of top is the certain oil-filled space formed after needle-valve opens certain space.
The geometric parameters such as atomizer degree, tapering and deflection angle are as shown in Figure 2.Wherein L is atomizer
Length, B is the atomizer deflection angle relative to whole nozzle axis, DinFor atomizer inlet diameter,
In the design, inlet diameter is invariable, for constant.DoutFor atomizer outlet diameter.Therefore oil spout
Mouth tapering CF is defined as follows
It addition, for the convenience compared and analyze, the length of atomizer the most directly uses initial value, but adopts
The parameter analyzed it is used as with its this non dimensional coefficient of ratio L/D with atomizer inlet diameter:
Based on measurement scheme commonly used in electromotor injection system R&D process, to existing a gasoline
In its single atomizer unit interval of engine measuring, ejection quality of gasoline, is defined as fuel injection rate, and
Use identical statement in the following description.It addition, also will be long according to this kind of its nozzle of atomizer design record
Degree, tapering and deflection angle.
The pressure that input is atomizer gateway needed for CFD simulation injection process and the relevant genus of gasoline
Property value；Input is ejected in the speed of all directions under local coordinate system for fuel injection rate, atomizer exit gasoline
Component, pressure and corresponding kinetic energy.
CFD phantom:
Turbulence model: SST K-ω model
Cavitation model: Rayleigh Plesset model
In addition to Equations of Turbulence uses single order precision, other all mathematical modeies use the discrete of second order accuracy.
Use the modeling tool in ANSYS Workbench and stress and strain model instrument, generate corresponding three-dimensional
Cad model and hexahedral mesh.In this CAD grid, atomizer inlet diameter fixed bit 200 μm, go out
Mouth diameter correspondingly changes according to the tapering CF value needed for research, and length is according to the L/D value needed for research
Correspondingly changing, deflection angle is according to the required change of research.
Grid model previous step generated imports Fluent, carries out according to the setting illustrated by S2 and S3
CFD simulation calculation, and record S2 explanation output result (S2 and S3 explanation be CFD emulation in adopt
By which type of initial condition and model it can be understood as real simulation operations step is to open from S4
Begin.But it is logically to consider this two step of S2 and S3 the most first listing, it is simply that making
How the most first explanation will be done)；
Through compareing with experimental result, the error between fuel injection rate and the experiment out of CFD simulation calculation is 3%
In.In view of measuring atomizer machining accuracy, experiment certainty of measurement and the CFD simulation calculation error used,
The error that emulation and experiment are measured is in the zone of reasonableness allowed.It follows that S2 to S5 is entered
The CFD emulation of row is correct reliable, and this phantom also will continue on for follow-up atomizer emulation
Research；If unreliable, check one by one the parameters in S2 to S5 the most correct it can be understood as
Change cad model, grid, emulation setting and parameter, then repeat the above steps.
Based on having verified that as reliable CFD model, the design of more atomizer is carried out simulation calculation,
It is concluded that
1), in the case of other conditions are constant, longer atomizer reinvents interior flow field due to it, makes
Obtain gasoline flowing regional rule, be unfavorable for the atomization after its ejection, thus be also unfavorable for vapour
The abundant burning of oil.
2) deflection angle B is the biggest, on the one hand can form bigger cavitation zone in nozzle interior, make
Gasoline flowing is more dispersed and unstable, and gasoline ejection on the other hand can be made to divide the when of going
Dissipate more opens, thus forms bigger spraying.These 2 be all conducive to vapour oil atomization and
The burning in later stage.
3) convergence type atomizer can extrude gasoline flow field, makes the gasoline after cavitation again liquefy, makes stream
The motion of field tends to rule, forms less spraying during jetting nozzle.In contrast, send out
The nozzle dissipating type can be easy to dissipating of flow field, causes bigger spraying, thus is formed more preferably
Atomization, beneficially gasoline fully burns.
In conjunction with Simulation result data and above-mentioned analysis result, tapering CF is-10, and length factor L/D is 1.0
It is optimal design with the atomizer that deflection angle B is 35 °.The design of this atomizer can be that gasoline is at nozzle
Exit is scattered more opens, and forms bigger preferably spraying, in order to gasoline mixes with the oxygen in combustor
That closes is more abundant, thus burn more abundant, improve fuel oil utilization ratio, drop low exhaust gas emission.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all in the present invention
Spirit and principle within, any modification, equivalent substitution and improvement etc. made, should be included in this
Within bright protection domain.
Claims (7)
1. a method for designing for perforated plate type atomizer, described in it is characterized in that:
S1, sets up perforated plate type atomizer simulation injection process model based on CFD software；
S2, the optimization carrying out perforated plate type atomizer based on perforated plate type atomizer simulation injection process model sets
Meter.
The method for designing of perforated plate type atomizer the most according to claim 1, it is characterised in that:
S1 is implemented as: the structure of perforated plate type atomizer simulation injection process model and porous oil spout
The checking of mouth simulation injection process model.
The method for designing of perforated plate type atomizer the most according to claim 2, it is characterised in that:
The structure of described perforated plate type atomizer simulation injection process model comprises the following steps:
S1-1-1, choose the perforated plate type atomizer required CFD model used of simulation injection process and set
Put；
S1-1-2, by the perforated plate type atomizer chosen simulation injection process model carry out stress and strain model.
The method for designing of perforated plate type atomizer the most according to claim 2, it is characterised in that:
The checking of described perforated plate type atomizer simulation injection process model comprises the following steps:
S1-2-1, carry out Physical Experiment, the reality that record obtains based on the design of existing atomizer
Test measurement result, as the basis of checking simulation result reliability；
S1-2-2, according to above-mentioned Physical Experiment, input quantity needed for determining injection process and described
The output that input quantity is corresponding；
Perforated plate type atomizer in S1-2-3, the input quantity importing S1-1-2 that will obtain in previous step
Simulation injection process model meshes, and carry out CFD calculating, and the output result needed for record,
Obtain CFD result of calculation；
S1-2-4, comparative experiments measurement result and CFD result of calculation, determine whether CFD calculates
Correct reliable, it is to obtain reliable perforated plate type atomizer simulation injection process model；No, adjust
Modelling also repeats step S1.
The method for designing of perforated plate type atomizer the most according to claim 1, it is characterised in that:
S2 is implemented as:
S2-1, based on have verified that for reliable perforated plate type atomizer simulate injection process model, right
More atomizer design carries out CFD calculating；
S2-2, the result that above-mentioned CFD calculates is formed corresponding curve chart and the response surface figure；
S2-3, the result calculated based on above-mentioned CFD, comprehensive analysis draws the optimum of atomizer
Structure designs.
6. a perforated plate type atomizer, it is characterised in that: set by the method for designing of claim 1-5
Meter draws, including oil injector body (1), needle-valve (2) and atomizer (3), described fuel injector
Body (1) is set in needle-valve (2), and described atomizer (3) is connected on needle-valve (2), institute
It is multiple for stating atomizer (3).
Perforated plate type atomizer the most according to claim 6, it is characterised in that: described atomizer
(3) being 3, the tapering CF of each described atomizer (3) is-10, length factor L/D
It is 1.0 and deflection angle B is 35 °.
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| CN201610269737.2A CN105930597B (en) | 2016-04-27 | 2016-04-27 | A kind of perforated plate type atomizer and its design method |
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| CN201610269737.2A CN105930597B (en) | 2016-04-27 | 2016-04-27 | A kind of perforated plate type atomizer and its design method |
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| CN105930597B CN105930597B (en) | 2019-05-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109902363A (en) * | 2019-02-11 | 2019-06-18 | 大连理工大学 | A kind of parameter designing and its method for numerical simulation of injecting type ditching machine nozzle |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2781022Y (en) * | 2005-04-01 | 2006-05-17 | 容生 | Fuel spray nozzle |
-
2016
- 2016-04-27 CN CN201610269737.2A patent/CN105930597B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2781022Y (en) * | 2005-04-01 | 2006-05-17 | 容生 | Fuel spray nozzle |
Non-Patent Citations (3)
| Title |
|---|
| B BEFRUI ET AL: "GDI multi-hole injector internal flow and spray analysis", 《ANALYSIS》 * |
| 朱希 等: "GDI多孔喷油器喷雾特性的试验与仿真研究", 《内燃机工程》 * |
| 程强 等: "喷孔结构对多孔GDI喷油器喷雾特性的影响", 《内燃机学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109902363A (en) * | 2019-02-11 | 2019-06-18 | 大连理工大学 | A kind of parameter designing and its method for numerical simulation of injecting type ditching machine nozzle |
| CN109902363B (en) * | 2019-02-11 | 2020-12-11 | 大连理工大学 | Parameter design and numerical simulation method of jet trencher nozzle |
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| CN105930597B (en) | 2019-05-31 |
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