CN106129445B - A kind of assignment of traffic uniformity optimum design method in branch manifold flow field - Google Patents
A kind of assignment of traffic uniformity optimum design method in branch manifold flow field Download PDFInfo
- Publication number
- CN106129445B CN106129445B CN201610652485.1A CN201610652485A CN106129445B CN 106129445 B CN106129445 B CN 106129445B CN 201610652485 A CN201610652485 A CN 201610652485A CN 106129445 B CN106129445 B CN 106129445B
- Authority
- CN
- China
- Prior art keywords
- air flue
- assignment
- fluid
- flow field
- uniformity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
- H01M8/2465—Details of groupings of fuel cells
- H01M8/2484—Details of groupings of fuel cells characterised by external manifolds
- H01M8/2485—Arrangements for sealing external manifolds; Arrangements for mounting external manifolds around a stack
-
- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16Z—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS, NOT OTHERWISE PROVIDED FOR
- G16Z99/00—Subject matter not provided for in other main groups of this subclass
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
- H01M8/249—Grouping of fuel cells, e.g. stacking of fuel cells comprising two or more groupings of fuel cells, e.g. modular assemblies
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Abstract
The present invention relates to a kind of assignment of traffic uniformity optimum design methods in branch manifold flow field, it is characterised in that：Design scheme can be adaptively designed flow field geometric parameter according to operating mode and operating condition, improve the uniformity of assignment of traffic.Present invention optimizes the assignment of traffic in flow field, make up to the high uniformity, can be widely used in chemical industry and energy industry (such as solid-oxide fuel cell stack) field.
Description
Technical field
The present invention relates to a kind of assignment of traffic uniformity optimum design methods in branch manifold flow field, belong to chemical industry, new energy
Industrial technical field.
Background technology
In Channels-Manifolds-Channels, i.e., ' input end sprue-branch manifold-outlet end sprue '
In type flow field, fluid is flowed into via input end runner, after flowing through branch manifold, then is discharged by outlet end runner.In this flowing
In the process, complicated hydrodynamics transporting mechanism frequently results in flow and distributes unevenness in branch manifold.For example, if lacking accurate
Design, assignment of traffic usually shows the phenomenon that successively decreasing with a direction in different branch manifolds.Flow in branch manifold
Distribution is uneven, can usually reduce the working efficiency of whole system.
One typical example is exactly solid-oxide fuel cell stack.Multi-layer cell piece stacks structure in the height direction
At battery pile, outlet/inlet end air flue is connected to these cell pieces constitutes complete current path.Sub- air flue in cell piece exists
The effect for playing the part of branch manifold in this whole flow field, the cell piece to different layers is guided by the fuel flowed into from input end air flue
Middle distribution.Electrochemical reaction, chemical reaction occur in cell piece for air-flow, and battery is discharged eventually by outlet end air flue is discharged into
Heap.Since cell piece stacks in a series arrangement in entire battery pile, in this flow process, the electricity of minimum discharge is obtained
Pond piece operating mode decides the fuel availability of whole system.It is whole that air-flow distributes the uneven serious system for restricting of meeting in different batteries
Energy conversion efficiency.It is many study found that point of inlet and outlet cross section of fluid channel product and the ratio between the two to flow in branch manifold
With influence highly significant.It is found importantly, being calculated by the Three-dimensional full coupling of superhigh precision, fluid is sent out in transmission process
Raw physics, chemical change also influence its evenly distributed degree.Therefore, accurate efficient design scheme is developed, optimization flow field is equal
Evenness is extremely important for improving system effectiveness.
Document 1：Wuxi Bi,Daifen Chen,Zijing Lin,A key geometric parameter for
the flow uniformity in planar solid oxide fuel cell stacks,International
Journal of Hydrogen Energy, 34 (2009), 3873-3884. authors establish a series of three-dimensional ' input end stream
The numerical model in road-branch manifold-outlet end runner ' type flow field, in optimization flat-plate-type solid-oxide fuel battery stack
Distribution of air flow has done systematic Optimized Simulated work, and gives runner design scheme for reference, shows as outlet, import
The fixed value of flow area ratio.The limitation of the design：(1) it is found by more accurate unity couping condition calculating, since this sets
Meter cannot consider the influence of electrochemistry, chemical reaction to assignment of traffic, and the accuracy of design parameter is inadequate, is suitable only for putting down
There is a situation where (process flowed merely, it is anti-that electrochemistry, chemistry do not occur in battery pile for gas when cold flow in plate battery pile
It answers).For the battery pile of steady-state operation (power generation), design is not enough to provide the assignment of traffic of high evenness.(2) design is
Optimization air passage outlet area is removed based on fixed tracheal entrance area, does not adapt to changeable operating condition, and cannot quantify
Design tracheal entrance area.(3) applicability is narrow, only for flat-plate-type solid-oxide fuel battery stack, it is impossible to be used in other
Energy conversion system.
Document 2：M.Peksen,A coupled 3D thermofluide-thermomechanical analysis of
a planar type production scale SOFC stack,International Journal of Hydrogen
Energy, 36 (2011), 11914-11928. authors illustrate 36 layers of plate fuel electricity of an actual motion in simulations
Chi Dui, the inlet and outlet air flue of the battery pile is distributed as the design of two import/tri- outlet, with the suggestion one in above chapter document
It causes.The battery pile air flue design faintly implys that potential design direction, quantitatively can not provide standard according to different operating modes
True design parameter.
There are two big major defects for existing technology：
(1) design accuracy is insufficient.Due to cannot the physics occurred in flowing, chemical change accurately be taken into account design scheme
In, the high evenness of assignment of traffic when these designs are not sufficient to ensure that steady-state operation.
(2) applicability is very limited.Different systems, operating mode and fluid type cannot be faced to be adjusted with being in harmony certainly.
For example once change cell stack or fuel type, design will be no longer applicable in.
Invention content
The technology of the present invention solves the problems, such as：Overcome the shortcomings of that existing design in accuracy and the scope of application, provides one
The assignment of traffic uniformity optimum design method in kind branch manifold flow field, in chemical industry and energy industry (such as solid oxide fuel
Battery pile) in it is widely used ' input end runner-branch manifold-outlet end runner ' propose improvement design scheme, optimization stream
Assignment of traffic in makes up to expected high evenness, the efficiency of lifting system work.The applicable condition of the design：Stream
Energy-flux density of the body in the runner of outlet end has visible increase or fluid in flow field compared to it in arrival end runner
Physics, chemical change do not occur.
The technology of the present invention solution：The improvement to 1 design scheme of document in the technical spirit, be allowed to it is more flexible and
It accurately, and can be towards more extensive system type.In the design it is the most key be the inlet -duct area of Exact Design runner with
And the value of α.The assignment of traffic uniformity is promoted by scaling α, is the common characteristic of the present invention and existing design.Difference lies in this
Invention provides a kind of more accurate and extremely wide applicability design scheme.The design method of this innovation can incite somebody to action
The factor that following four influences assignment of traffic is included into design scheme：
(1) inlet -duct area of runner.
(2) ratio-α of runner exit area and inlet -duct area.
(3) physical and chemical process that fluid is subjected in the transmission.
(4) different type of fluid.
These influence factors are accurately included in design scheme in the form of parameter so that this design method being capable of basis
Expected operating mode and operating condition adaptively determine appropriate design parameter.
Design philosophy is as follows：
/ ratio the α of input end cross section of fluid channel product and the two is quantitatively improved out by adaptive design principle.When towards
When certain a kind of system is designed, take under simple flow regime the characteristic parameter of some known system and operating mode as canonical reference
Value (is referred to) with subscript ' 0 '.In system as reference, the assignment of traffic uniformity is U in flow field0, outlet end cross section of fluid channel
The ratio of product and input end cross section of fluid channel product is α0,Unevenness degree is in frame of reference
(1-U0), it is expected the flow field uniformity of new system at least promoting δ (1-U by the design scheme0)。
The technology of the present invention includes two design schemes to complement one another and a set of execution method.
Design scheme 1：When designing α, adaptive design scheme is：
Subscript 0 represents reference value.SubscriptOUT,INOutlet end air flue, arrival end air flue are indicated respectively.K indicates fluid in air flue
The kinetic energy rejection coefficient of middle flowing.ekIndicate fluid dynamic energy density, viAnd μiBranch manifold inner fluid speed and viscosity are indicated respectively.
The physicochemical change occurred in process fluid flow can be by ek、vi、μiCharacterization.δ characterizations are expected by the opposite ginseng of flow uniformity
The degree that test system is promoted is annotated please refer to ' design philosophy ' part in detail.
To improve system bulk power density, α also can use near the minimum value that design formula obtains.If without being limited to
System bulk problem, α can use near its maximum value.
It is that reference value can be by very as the meaning with reference to value using the characteristic parameter of arbitrary system under pure flowing
Convenient means obtain, including simple numerical simulation, simple experiment or known normal data.SubscriptOUT,INIt indicates respectively
Outlet end air flue, arrival end air flue.K indicates the kinetic energy rejection coefficient that fluid flows in air flue.ekIndicate fluid dynamic energy density,
viAnd μiBranch manifold inner fluid speed and viscosity are indicated respectively.The physicochemical change occurred in process fluid flow can be by ek、
vi、μiCharacterization.As long as parsing these processes by corresponding physical chemistry equation, so that it may accurately to set airway parameters.Meanwhile
The influence and inlet -duct area of fluid properties, the variation of inlet velocity, energy conversion regime to fluid can at tunnel inlets
It is reflected in these three parameters.For example, electrochemical process can cause fluid in the increase of outlet end density, chemical reaction process meeting
Change speed, the viscosity of fluid in branch manifold.
The area factor at tunnel inlets end can be illustrated by mass flux.fluxIN=ρ vSINIf type of fluid is constant,
When maintaining same import mass flux,Then fluid is in the variation of entrance kinetic energy density：
Design scheme 2：When quantitative design inlet -duct area, adaptive design scheme is
Subscript 0 represents reference value.SubscriptOUT,INOutlet end air flue, arrival end air flue are indicated respectively.K indicates fluid in air flue
The kinetic energy rejection coefficient of middle flowing.ekIndicate fluid dynamic energy density, viAnd μiBranch manifold inner fluid speed and viscosity are indicated respectively.
The physicochemical change occurred in process fluid flow can be by ek、vi、μiCharacterization.δ characterizations are expected by the opposite ginseng of flow uniformity
The degree that test system is promoted is annotated please refer to ' design philosophy ' part in detail.
Unlike α, the no theoretic upper limit of increase of inlet -duct area.But need to balance it and system power is close
The relationship of degree.
In the design, three kinds of execution methods may be used：
(1) suitable tunnel inlets end area is determined according to expected volumetric power density, substitutes into design scheme 1, obtain α
Value.
(2) system optimum a-value allowed is substituted into design scheme 2, obtains SIN。
(3) according to different operating conditions, with α andUniformity distribution curve is established for coordinate, determines best stream
Road parameter.
The advantages of the present invention over the prior art are that：
The present invention is more accurate, and the scope of application is more extensive, can be according to different inlet and outlet conditions, different fluids, stream
The physical and chemical process occurred in physical efficiency amount conversion regime and flow process provides accurate design, to promote flow point
With the uniformity.By the amendment of the design scheme, the deficiency and error of 1 prioritization scheme of document can be eliminated, flow is obviously improved
The uniformity of distribution, and have more wide applicability, it is applicable to all using ' input end runner-branch manifold-outlet
Hold the energy conversion device in runner ' type flow field.Meanwhile tunnel inlets area can also pass through the design quantitative optimization.
Description of the drawings
Fig. 1 is according to the present invention, includes the branch manifold flow field model X-Y scheme of outer flue；
Fig. 2 is the geometrical model of entire battery pile.
Specific implementation mode
As shown in Figure 1, the complete branch manifold flow field comprising outer flue includes input end runner 1, branch manifold 2 and outlet end
Runner 3.
As shown in Fig. 2, the simulation of high accuracy three-dimensional coupling Simulation is found, 30 layers of flat-plate-type solid-oxide is fired
Expect battery pile, when the design inlet and outlet air flues of parameter alpha ≈ 1.65 suggested using document 1, starts moment (fluid in battery pile
The variation on physical chemistry does not occur when being transmitted in battery pile) the assignment of traffic uniformity about 99%, and in steady-state operation
The assignment of traffic uniformity is reduced to 90% or so.
It is calculated and is found by accurate unity couping, in the solid-oxide fuel cell stack of steady-state operation, assignment of traffic
The uniformity can decay with the generation of electrochemical reaction and chemical reaction.The air flue design of this decaying is inhibited to join in order to obtain
Number α, it is contemplated that close under the fuel availability limit stable state stack current, gas component variation, viscosity change, in sub- air flue
Gas velocity plugs these values into adaptive design scheme 1, obtains new design parameter --- α >=2.Entire battery pile
Geometrical model is as shown in Figure 2：
After this design, the battery flow field uniformity in steady-state operation is kept at hydrogen and methane fuel
96% or more.
In short, the present invention can be directed to different operating conditions, energy conversion regime optimizes air flue design, in ' input end
It realizes that the fluid flow transmission of the high uniformity distributes in runner-branch manifold-outlet end runner ' type flow field, is to improve
The efficiency of system.In New Energy Industry, which can be applied to the distribution of air flow in solid-oxide fuel cell stack (SOFC)
Optimization, the distribution of air flow of high evenness is provided for battery stack operation, to realize uniform operating mode and Gao Ran in entire battery pile
Expect utilization rate.
Above example is provided just for the sake of the description purpose of the present invention, and is not intended to limit the scope of the present invention.This
The range of invention is defined by the following claims.It does not depart from spirit and principles of the present invention and the various equivalent replacements made and repaiies
Change, should all cover within the scope of the present invention.
Claims (2)
1. a kind of assignment of traffic uniformity optimum design method in branch manifold flow field, it is characterised in that：The flow field is by input end
Runner, intermediate branch manifold and outlet end runner are constituted；Flow field is adaptively designed exit port end according to operating mode and operating condition
The ratio α of both air flue area and outlet end air flue and input end air flue area, improves the uniformity of assignment of traffic；
The α is：
Subscript 0 represents reference value, subscriptOUT,INIndicate that outlet end air flue, arrival end air flue, K indicate that fluid flows in air flue respectively
Dynamic kinetic energy rejection coefficient, ekIndicate fluid dynamic energy density, viAnd μiBranch manifold inner fluid speed and viscosity, fluid are indicated respectively
The physicochemical change occurred in flow process is by ek、vi、μiCharacterization, δ characterizations are expected to carry flow uniformity with respect to frame of reference
The degree risen, '-' in formula on parameter represent average value.
2. a kind of assignment of traffic uniformity optimum design method in branch manifold flow field according to claim 1, feature exist
In：The input end air flue area SINFor：
Subscript 0 represents reference value, subscriptOUT,INIndicate that outlet end air flue, arrival end air flue, K indicate that fluid flows in air flue respectively
Dynamic kinetic energy rejection coefficient, ekIndicate fluid dynamic energy density, viAnd μiBranch manifold inner fluid speed and viscosity, fluid are indicated respectively
The physicochemical change occurred in flow process is by ek、vi、μiCharacterization, δ characterizations are expected to carry flow uniformity with respect to frame of reference
The degree risen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610652485.1A CN106129445B (en) | 2016-08-10 | 2016-08-10 | A kind of assignment of traffic uniformity optimum design method in branch manifold flow field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610652485.1A CN106129445B (en) | 2016-08-10 | 2016-08-10 | A kind of assignment of traffic uniformity optimum design method in branch manifold flow field |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106129445A CN106129445A (en) | 2016-11-16 |
| CN106129445B true CN106129445B (en) | 2018-10-23 |
Family
ID=57257440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610652485.1A Active CN106129445B (en) | 2016-08-10 | 2016-08-10 | A kind of assignment of traffic uniformity optimum design method in branch manifold flow field |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106129445B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108321455A (en) * | 2017-01-18 | 2018-07-24 | 盾安环境技术有限公司 | Power battery heat exchanger and power battery assembly |
| CN112117512B (en) * | 2020-08-25 | 2022-02-11 | 江苏科技大学 | New energy automobile lithium battery thermal management system based on liquid medium |
| CN115832350B (en) * | 2023-02-20 | 2023-05-12 | 中海储能科技(北京)有限公司 | Method for improving flow distribution uniformity of flow battery |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778377A (en) * | 2012-08-03 | 2012-11-14 | 北京科技大学 | Electrolysis determination method of macro nonmetallic inclusions in steel |
| CN104866646A (en) * | 2015-04-11 | 2015-08-26 | 成都陵川特种工业有限责任公司 | Engine intake manifold optimization method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040265675A1 (en) * | 2003-06-24 | 2004-12-30 | General Electric Company | Fuel Cell Flow Field Design |
-
2016
- 2016-08-10 CN CN201610652485.1A patent/CN106129445B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778377A (en) * | 2012-08-03 | 2012-11-14 | 北京科技大学 | Electrolysis determination method of macro nonmetallic inclusions in steel |
| CN104866646A (en) * | 2015-04-11 | 2015-08-26 | 成都陵川特种工业有限责任公司 | Engine intake manifold optimization method |
Non-Patent Citations (3)
| Title |
|---|
| A coupled 3D thermofluid-thermomechanical analysis of a planar type production scale SOFC stack;M.Peksen;《International Journal of Hydrogen Energy》;20110930;第36卷(第18期);全文 * |
| A key geometric parameter for the flow uniformity in planar solid oxide fuel cell stacks;Wuxi Bi et al.;《Interational Journal of Hydrogen energy》;20090531;第34卷(第9期);第3876页右栏第2-3段，第3877页左栏第1段和右栏第1段，第3881页左栏第1-4段，图2-4，式9-10，式14-16 * |
| 碳基固体氧化物燃料电池理论模拟概述;李家玉等;《中国工程科学》;20130430;第15卷(第2期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106129445A (en) | 2016-11-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Huang et al. | Performance evaluation of commercial-size proton exchange membrane fuel cell stacks considering air flow distribution in the manifold | |
| Pei et al. | Numerical studies on wide-operating-range ejector based on anodic pressure drop characteristics in proton exchange membrane fuel cell system | |
| CN111180767B (en) | Fuel cell stack modeling method with fluid uneven distribution effect | |
| CN106129445B (en) | A kind of assignment of traffic uniformity optimum design method in branch manifold flow field | |
| Chen et al. | Flow distribution in the manifold of PEM fuel cell stack | |
| Yang et al. | Investigation of performance heterogeneity of PEMFC stack based on 1+ 1D and flow distribution models | |
| König et al. | Model based examination on influence of stack series connection and pipe diameters on efficiency of vanadium redox flow batteries under consideration of shunt currents | |
| Costamagna et al. | Fluid dynamic study of fuel cell devices: simulation and experimental validation | |
| CN109902435A (en) | Proton Exchange Membrane Fuel Cells modeling method, storage medium and computer equipment | |
| CN109873186B (en) | Method for establishing proton exchange membrane fuel cell quasi-two-dimensional model | |
| CN106207311B (en) | A kind of distributed bilateral liquid cooling system and flow control methods of electrokinetic cell system | |
| Shao et al. | Modeling and analysis of water droplet dynamics in the dead-ended anode gas channel for proton exchange membrane fuel cells | |
| CN109977615B (en) | Design method for measuring pipeline structure of indentation type electromagnetic flow sensor | |
| Liu et al. | Modeling and design of air-side manifolds and measurement on an industrial 5-kW hydrogen fuel cell stack | |
| Yan et al. | Mass transfer enhancement of a spiral-like interconnector for planar solid oxide fuel cells | |
| Lu et al. | Influence mechanisms of flow channel geometry on water transfer and pressure loss in planar membrane humidifiers for PEM fuel cells | |
| Chen et al. | Optimization and thermal-performance deep learning on carbon/epoxy composite panels with microchannel structure for battery cooling | |
| CN108432019B (en) | Measuring method and measuring device for determining a recirculation rate | |
| Figueredo‐Rodríguez et al. | Current distribution in a rectangular flow channel manufactured by 3‐D printing | |
| CN116125285A (en) | Flow battery performance prediction method based on flow non-uniformity among monomers | |
| CN110442923A (en) | A kind of lithium ion battery liquid cooling heat management system Robust Design Optimization method | |
| Dang et al. | Multiphysics coupling simulation and parameter study of planar solid oxide fuel cell | |
| Dey et al. | Improvement in solid oxide fuel cell performance through design modifications: An approach based on root cause analysis | |
| Barzi et al. | Three dimensional simulation of a counter-flow planar solid oxide fuel cell | |
| CN207441872U (en) | A kind of micro fuel cell apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |