CN106354963A - Research method for fuel oil liquid drop evaporation process in porous medium model structure - Google Patents
Research method for fuel oil liquid drop evaporation process in porous medium model structure Download PDFInfo
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- CN106354963A CN106354963A CN201610807880.2A CN201610807880A CN106354963A CN 106354963 A CN106354963 A CN 106354963A CN 201610807880 A CN201610807880 A CN 201610807880A CN 106354963 A CN106354963 A CN 106354963A
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- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
Abstract
The invention provides a research method for the fuel oil liquid drop evaporation process in a porous medium model structure. The method includes the steps that Gambit software is used for constructing three model structures (including aligned arrangement and interleaved arrangement structure porous medium models instead of a porous medium model), corresponding grids are drawn, and wall surface attribute in the models as well as a fluid region and a solid region are set; grid files of the three kinds of models manufactured by Gambit are guided into Fluent software, and calculation method in the three models and the physical property parameters of fuel oil liquid drops are set by the Fluent software and calculated respectively, and then the fuel oil liquid drop evaporation processes in the three kinds of models are compared to obtain a mass fraction distribution cloud picture of the fuel oil liquid drops. The distribution rule of the mass fraction of the fuel oil liquid drops can be researched and analyzed, which is of great significance in further improving fuel combustion efficiency, reducing pollutant emission and researching and developing a new porous medium model.
Description
Technical field
The present invention relates to porous media is stacking bed and Porous Medium Engine in the prediction of diesel oil evaporation process and optimization, tool
Body is the side that a kind of utilization fluent software is predicted and optimized to droplet evaporation process simulation in porous media model structure
Method.
Background technology
The burning of fuel is the main path that the mankind obtain the energy, and the energy of the world today more than 80% both is from fossil
The burning of fuel.How to reduce burning and exhausting and raising efficiency of combustion has become the two big hot subjects in current combustion field, be
This Chinese scholars proposes various new combustion technologies.Recent two decades come, porous media filtration combustion technology [mujeebu
Ma, abdullah mz, abu bakar mz, et al, journal of environmental managemen, 2009,90:
2287-2312] extensive concern of academia is caused it is possible to become in the recent period, even with outstanding features such as its superadiabatic, low stain
Fuel combustion pollution and an important technology of fossil energy exhaustion problem is solved, for developing and designing new in long duration
High-efficiency cleaning combustion system provides a kind of new way.
Porous media filtration combustion technology can successfully be burnt the liquid fuels such as kerosene, diesel oil, wherein plays a crucial role
Be fuel evaporation process.Because porous media inner structure is complicated, have very big internal surface area, can promote to be ejected into porous
The liquid crushing of medium, be conducive to fuel oil to be uniformly distributed in space and realize secondary-atomizing (m.weclas, j.cypris,
T.m.a.maksoud, diesel spray interaction with highly porous structures for
Supporting of liquid distribution in space and its vaporization, proceedings
(cd)of the 4th international conference on porous media and its applications
In science and engineering icpm4june 17-22,2012, potsdam, germany).When in porous media
EVAP combine with its internal special combustion system after, it will greatly improve fluid combustion stability, combustion
Burn efficiency and Flammability limits.This is to improve the traditional jet atomization of liquid fuel and diffusion combustion mode, realizes prevapourising burning
Provide important direction.
In recent years, it is subject to people's using multi-hole medium combustion technology combustion of liquid fuel as a New combustion technique
Pay attention to, obtained relatively broad practical application at aspects such as Porous Medium Engine, oil burning boiler, oil extractions.Sending out
Porous media is incorporated in engine cylinder in motivation field, can realize liquid and steam in advance in the labyrinth of three-dimensional porous medium
Send out, thermal ignition and homogeneous combustion, make electromotor have the features such as thermal efficiency is high, discharge is low, lean limit is wide (navid
Shahangian, damon honnery, jamil ghojel, the role of porous media in
Homogenization of high pressure diesel fuel spray combustion, journal of
Energy resources technology, copyright by asme 2014,136,012202.).Using porous media
Liquid filtration combustion technology realizes the on-catalytic reforming silicol process of the liquid fuels such as aerial kerosene, heptane, has been subject to foreign scholar
Concern (pastore a, mastorakos e, syngas production from liquid fuels in a non-
Catalytic porous burner, fuel, 90:64-76,2011).
In fields such as industrial chemical industry, pharmacy, using the backheat effect of porous media filtration combustion, can be not required to
Burning (pastore a, mastorakos e, the syngas production of toxic waste liquid is realized in the case of external energy
From liquid fuels in a non-catalytic porous burner, fuel, 90:64-76,2011).In the recent period,
Porous media occurs on minute yardstick liquid burner, for solve micro-scale gas flow (junwei li, jinghuai huang,
Mi yan, dan zhao, experimental study of n-heptane/air combustion in meso-scale
Burners with porous media, experimental thermal and fluid science, 2014,52:47
58.) difficulty being faced and challenge.
In sum, porous media liquid filtration combustion, before having wide application in economic construction and social development
Scape.But current people are also far from enough deeply and comprehensive to the understanding of filtration combustion, particularly many basic problem in science,
Need to be studied and verify.
Content of the invention
The present invention is a kind of research method of porous media model structure intermediate fuel oil droplet evaporation process, this research method
Combined based on modeling software gambit and computational fluid dynamics software fluent, by the steaming to fuel droplets (as diesel oil)
Send out region to be observed and optimize, can effectively study evaporation process in geometric model unit for the fuel droplets, design
Prioritization scheme, can observe in the porous media model building the diameter change process of fuel droplets, temperature changing process and
Change of evaporation rate etc., is to provide using the efficient burning that porous media filtration combustion technology realizes liquid fuel to instruct.
In order to achieve the above object, the technical scheme is that
A kind of research method of porous media model structure intermediate fuel oil droplet evaporation process, the method is first with gambit
Three kinds of models of software building (do not contain porous media model and contain in-line arrangement, insert row structural porous dielectric model), and draw
Corresponding grid, the wall attribute in setting model and fluid mass and solid area.Then three kinds of moulds gambit being made
The grid file of type imports fluent software, using the thing to the computational methods in three kinds of models and fuel droplets for the fluent software
Property parameter set, be then respectively calculated, finally contrast three kinds of model intermediate fuel oil drops evaporation process.Concrete steps
As follows:
The first step, suitable using the two-dimentional planomural geometric model of parametric modeling function foundation of gambit software, porous media
Row's geometric model and porous media insert row geometric model；Described two-dimentional planomural geometric model and porous media in-line arrangement geometric model
For square, a size of 5mm-50mm；Described porous media insert row geometric model is rectangle, and described rectangular dimension is a width of
5.732mm-57.32mm, highly for 9.305mm-93.05mm.Described porous media in-line arrangement geometric model and porous media are inserted
All there is a sector at four angles of row's geometric model, and described sector is porous media high-temperature wall surface, by a quarter
Aluminium oxide or carborundum bead are constituted, and described the small ball's diameter is 4mm-40mm, and described high-temperature wall surface temperature is 800k-1000k.
Border between two high-temperature wall surfaces is taken as exporting, and described exit width is 1mm-10mm.
Three kinds of geometric models are carried out stress and strain model, and derived grid file, as fluid calculation software fluent software
Input file.
Second step, reads, by fluid calculation software fluent, the grid file that the first step obtains, and checks grid, if knot
There is negative volume mesh in fruit, re-start stress and strain model；If not bearing volume mesh in result, carry out next step.
3rd step, carries out the model setting in fluent
3.1) successively the energy equation on start-up operation panel, the k-epsilon equation in Viscosity Model, in radiation patterns
Discrete ordinates equation, more successively activation fuel droplets material category model in concrete option, activation discrete
Option and injection option that discrete phase in item model is interacted with continuous phase；
3.2) design parameter of option is sprayed on guidance panel in setting fluent: in two-dimentional planomural geometric model and porous
In medium in-line arrangement geometric model, the eject position of fuel droplets is set as the midpoint on a border, described border refers to four
Any one in individual border；In porous media insert row geometric model, the eject position of fuel droplets is set as rectangle
One summit, described summit refers to any one in four summits.Reset the diameter of initial fuel drop, temperature, spray
Firing rate degree, injection end time and mass flow, described diameter value is 5.0 × 10-5m-5.0×10-4M, temperature are 300k-
341k, jet velocity are vx=10, vy=5.75m/s or vx=5.75, vy=5.75m/s, injection end time are 1.0 × 10- 6S, mass flow are 5.0 × 10-4kg/s.
3.3) density of setting fuel droplets, specific heat capacity, boiling point parameter in material options, and add new solid material
Material aluminium oxide or carborundum.
4th step, setting boundary condition and computational methods in geometric model
Aluminium oxide or the carborundum high-temperature wall surface of two-dimentional planomural geometric model, described high temperature wall, in geometric model, are set
Face temperature is 800k-1000k, and outlet is disposed as pressure export, and operating pressure is set to a normal atmosphere, described standard
Atmospheric pressure is 101325pa.Setting calculating method successively again, described computational methods adopt simple method；Set space from
Scattered method, in described spatial spreading method, gradient calculation method adopts Green's Gauss algorithm, and calculation of pressure method adopts standard
Option, the computational methods of momentum, tubulence energy and tubulence energy dissipative shock wave and energy equation are all using Second-order Up-wind form.
5th step, model initialization and calculating and setting
The parameter of zoning is initialized, and in porous media in-line arrangement geometric model and porous media insert row geometry
In model, the high-temperature wall surface temperature setting of aluminium oxide or carborundum is 800k 1000k；Calculating activity option in fluent
Middle setting automatically saves dat file, and the described dat file that automatically saves refers to that fluent completes the meter of 10 time steps every time
During calculation, automatically save a dat file to storage location；Time step is set as 1.0 × 10-6s-5.0×10-5s；To walk
Long quantity is set as 5000-50000, and the maximum iteration time in each time step is set as 1000 times, starts to calculate；
6th step, is read the dat file of fluent under corresponding operating mode, is put down using the graphics option in fluent
The mass fraction distribution of wall geometric model, porous media in-line arrangement geometric model and porous media insert row geometric model intermediate fuel oil drop
Cloud atlas.
In the present invention, fluent software can preferably describe the evaporation process of fuel droplets, contrasts three kinds of geometric models, can
Know that under identical operating mode, the geometric model containing porous media is more beneficial for fuel droplets evaporation.
The present invention does not contain porous media model by foundation and contains in-line arrangement, insert row structural porous medium geometric model,
Provide a kind of research method of fuel droplets microcosmic mechanism of evaporation process and physical property change in porous media.The method can
To research and analyse the regularity of distribution of fuel droplets mass fraction, to improving fuel oil efficiency of combustion further, reduce pollutant emission
Have great importance with research and development porous media new model.
Brief description
Fig. 1 is the flow chart of the present invention；
Fig. 2 is the grid schematic diagram of two-dimentional planomural geometric model；
Fig. 3 is the grid schematic diagram of porous media in-line arrangement geometric model；
Fig. 4 is the grid schematic diagram of porous media insert row geometric model；
Fig. 5 is the mass fraction cloud charts of diesel oil drop in two-dimentional planomural geometric model；
Fig. 6 is the mass fraction cloud charts of diesel oil drop in porous media in-line arrangement geometric model；
Fig. 7 is the mass fraction cloud charts of diesel oil drop in porous media insert row geometric model.
Specific embodiment
In order to be that the purpose of the present invention, technical scheme become more apparent, below in conjunction with accompanying drawing, the present invention is entered with traveling one
Step describes in detail.
The research method of diesel oil droplet evaporation process in a kind of porous media geometric model structure, using fluent software pair
The physical parameter of three kinds of geometric model Computational Methods and diesel oil drop is set, and is then respectively calculated, finally contrasts
The evaporation process of diesel oil drop in three kinds of geometric models.The flow chart of the present invention such as Fig. 1, shown, specifically comprise the following steps that
The first step, suitable using the two-dimentional planomural geometric model of parametric modeling function foundation of gambit software, porous media
Row's geometric model and porous media insert row geometric model；Described two-dimentional planomural geometric model and porous media in-line arrangement geometric model
For square, a size of 5mm；Described porous media insert row geometric model is rectangle, a width of 5.732mm of described rectangular dimension,
It is highly 9.305mm.Four angles of described porous media in-line arrangement geometric model and porous media insert row geometric model all have one
Individual sector, described sector is porous media high-temperature wall surface, is made up of the aluminium oxide or carborundum bead of a quarter, institute
The small ball's diameter stated is 4mm.Border between two high-temperature wall surfaces is taken as exporting, and described exit width is 1mm.
The grid schematic diagram of two-dimentional planomural geometric model is as shown in Fig. 2 the grid of porous media in-line arrangement geometric model is illustrated
Figure is as shown in figure 3, the grid schematic diagram of porous media insert row geometric model is as shown in Figure 4.Three kinds of geometric models are carried out grid
Divide, and derived grid file, as the input file of fluid calculation software fluent software.
Second step, reads, by fluid calculation software fluent, the grid file that the first step obtains, and checks grid, if result
In have negative volume mesh, re-start stress and strain model；If not bearing volume mesh in result, carry out next step.
3rd step, carries out the model setting in fluent
3.1) successively the energy equation on start-up operation panel, the k-epsilon equation in Viscosity Model, in radiation patterns
Discrete ordinates equation, the more concrete option in active liquid material kind class model successively, activate discrete items mould
Option and injection option that discrete phase in type is interacted with continuous phase；
3.2) design parameter of option is sprayed on guidance panel in setting fluent: in two-dimentional planomural geometric model and porous
In medium in-line arrangement geometric model, the eject position of fuel droplets is set as the midpoint on a border, described border refers to four
Any one in individual border；In porous media insert row geometric model, the eject position of fuel droplets is set as rectangle
One summit, described summit refers to any one in four summits.Reset the diameter of initial fuel drop, temperature, spray
Firing rate degree, injection end time and mass flow, described diameter value is 5.0 × 10-5m-5.0×10-4M, temperature are 300k-
341k, jet velocity are vx=10, vy=5.75m/s or vx=5.75, vy=5.75m/s, injection end time are 1.0 × 10- 6S, mass flow are 5.0 × 10-4kg/s.
3.3) density of setting fuel droplets, specific heat capacity, boiling point parameter in material options, and add new solid material
Material aluminium oxide or carborundum.
4th step, setting boundary condition and computational methods in geometric model
Aluminium oxide or the carborundum high-temperature wall surface of two-dimentional planomural geometric model, described high temperature wall, in geometric model, are set
Face temperature is 800k, and outlet is disposed as pressure export, and operating pressure is set to a normal atmosphere, described normal atmosphere
Power is 101325pa.Setting calculating method successively again, described computational methods adopt simple method；Set spatial spreading side
Method, in described spatial spreading method, gradient calculation method adopts Green's Gauss algorithm, and calculation of pressure method adopts standard option,
The computational methods of momentum, tubulence energy and tubulence energy dissipative shock wave and energy equation are all using Second-order Up-wind form.
5th step, model initialization and calculating and setting
The parameter of zoning is initialized, and in porous media in-line arrangement geometric model and porous media insert row geometry
In model, the high-temperature wall surface temperature setting of aluminium oxide or carborundum is 800k or 1000k；Calculating activity choosing in fluent
In, setting automatically saves dat file, and the described dat file that automatically saves refers to that fluent completes 10 time steps every time
During calculating, automatically save a dat file to storage location；Time step is set as 1.0 × 10-5s；Number of steps is set
For 10000, the maximum iteration time in each time step is set as 1000 times, starts to calculate.
6th step, by three kinds of geometric models of narration in the first step, the different parameters of setting obtain six kinds of operating modes and are counted
Calculate contrast, six kinds of described operating modes include planomural geometric model, and the aluminium oxide of planomural geometric model or carborundum high-temperature wall surface are
800k, diesel oil drop angle of incidence is 30 °；Including porous media in-line arrangement geometric model, its aluminium oxide or carborundum high-temperature wall surface temperature
Spend for 800k or 1000k, diesel oil drop incident angle is 30 ° or 45 °；Including porous media insert row geometric model, its aluminium oxide
Or carborundum high-temperature wall surface temperature 1000k, diesel oil drop incident angle be 30 °.
7th step, reads three kinds of geometric model difference operating modes respectively by fluent and corresponds to dat file, using in fluent
Graphics option obtain bavin in planomural geometric model, porous media in-line arrangement geometric model and porous media insert row geometric model
The mass fraction cloud charts of oil drops.Read diesel oil drop under identical operating mode for three kinds of geometric models respectively with fluent to reach
To the dat file in saturation temperature moment, described operating mode is that in three kinds of geometric models, aluminium oxide or carborundum high-temperature wall surface are
800k, diesel oil drop angle of incidence is 30 °, obtains diesel oil drop in planomural geometric model using graphics option in fluent
Mass fraction cloud charts as shown in Figure 5, in porous media in-line arrangement geometric model diesel oil drop mass fraction cloud charts such as
As shown in Figure 7 with the mass fraction cloud charts of diesel oil drop in porous media insert row geometric model shown in Fig. 6.
Claims (1)
1. a kind of research method of porous media model structure intermediate fuel oil droplet evaporation process is it is characterised in that following steps:
The first step, sets up two-dimentional planomural geometric model, porous media in-line arrangement geometric model and porous media using gambit software
Insert row geometric model；Described two-dimentional planomural geometric model and porous media in-line arrangement geometric model are square, a size of 5mm-
50mm；Described porous media insert row geometric model is rectangle, a width of 5.732mm-57.32mm of described rectangular dimension, highly
For 9.305mm-93.05mm；Four angles of described porous media in-line arrangement geometric model and porous media insert row geometric model are equal
There is a sector, described sector is porous media high-temperature wall surface, by aluminium oxide or the carborundum bead structure of a quarter
Become, described high-temperature wall surface temperature is 800k-1000k, described aluminium oxide or carborundum the small ball's diameter are 4mm-40mm；Two high
Border between warm wall is taken as exporting, and described exit width is 1mm-10mm；
Three kinds of geometric models are carried out stress and strain model, and derived grid file, defeated as fluid calculation software fluent software
Enter file；
Second step, reads, by fluid calculation software fluent, the grid file that the first step obtains, and checks grid, if having in result
Negative volume mesh, re-starts stress and strain model；If not bearing volume mesh in result, carry out next step；
3rd step, carries out the model setting in fluent
3.1) successively the energy equation on start-up operation panel, the k-epsilon equation in Viscosity Model, in radiation patterns
Discrete ordinates equation, then activate the concrete option in fuel droplets material category model successively, activate discrete items
Option and injection option that discrete phase in model is interacted with continuous phase；
3.2) design parameter of option is sprayed on guidance panel in setting fluent: in two-dimentional planomural geometric model and porous media
The eject position of fuel droplets is set, described droplet jet position is the midpoint of either boundary in in-line arrangement geometric model；Many
The eject position of fuel droplets is set, described droplet jet position is arbitrary top of rectangle in the medium insert row geometric model of hole
Point；Reset diameter, temperature, jet velocity, injection end time and the mass flow of initial fuel drop；
3.3) density of setting fuel droplets, specific heat capacity, boiling point parameter in material options, and add new solid material oxygen
Change aluminum or carborundum；
4th step, setting boundary condition and computational methods in geometric model
Aluminium oxide or the carborundum high-temperature wall surface of two-dimentional planomural geometric model, in geometric model, are set, and outlet is disposed as pressing
Power exports, and operating pressure is set to a normal atmosphere；Set simple computational methods successively again, set spatial spreading method,
Calculation of pressure method adopts standard option, and the computational methods of momentum, tubulence energy and tubulence energy dissipative shock wave and energy equation all adopt
Second-order Up-wind form；In described spatial spreading method, gradient calculation method adopts Green's Gauss algorithm；
5th step, model initialization and calculating and setting
The parameter of zoning is initialized, and in porous media in-line arrangement geometric model and porous media insert row geometric model
In, the high-temperature wall surface temperature setting of aluminium oxide or carborundum is 800k 1000k；The calculating activity option of fluent sets
Put and automatically save dat file, the described dat file that automatically saves refers to that fluent completes the calculating of 10 time steps every time
When, automatically save a dat file to storage location；Time step is set as 1.0 × 10-6s-5.0×10-5s；By step-length
Quantity set is 5000-50000, and the maximum iteration time in each time step is set as 1000 times, starts to calculate；
6th step, reads the dat file of fluent under corresponding operating mode, obtains planomural using the graphics option in fluent several
The mass fraction distribution clouds of what model, porous media in-line arrangement geometric model and porous media insert row geometric model intermediate fuel oil drop
Figure.
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| CN107346353A (en) * | 2017-06-05 | 2017-11-14 | 民政部零研究所 | A kind of solid burning article combustion process emulation mode and server |
| CN109060805A (en) * | 2018-08-22 | 2018-12-21 | 北京理工大学 | A kind of experimental provision and method evaporating kinetic characteristic for studying droplet cluster |
| CN113343450A (en) * | 2021-05-26 | 2021-09-03 | 重庆长安汽车股份有限公司 | Method for determining evaporation rate of single fuel oil liquid drops in internal combustion engine cylinder |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107346353A (en) * | 2017-06-05 | 2017-11-14 | 民政部零研究所 | A kind of solid burning article combustion process emulation mode and server |
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| CN109060805A (en) * | 2018-08-22 | 2018-12-21 | 北京理工大学 | A kind of experimental provision and method evaporating kinetic characteristic for studying droplet cluster |
| CN113343450A (en) * | 2021-05-26 | 2021-09-03 | 重庆长安汽车股份有限公司 | Method for determining evaporation rate of single fuel oil liquid drops in internal combustion engine cylinder |
| CN113343450B (en) * | 2021-05-26 | 2022-08-09 | 重庆长安汽车股份有限公司 | Method for determining evaporation rate of single fuel oil liquid drops in internal combustion engine cylinder |
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