CN107491572A - Fluid emulation computational methods in a kind of cylinder - Google Patents
Fluid emulation computational methods in a kind of cylinder Download PDFInfo
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- CN107491572A CN107491572A CN201610682650.8A CN201610682650A CN107491572A CN 107491572 A CN107491572 A CN 107491572A CN 201610682650 A CN201610682650 A CN 201610682650A CN 107491572 A CN107491572 A CN 107491572A
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Abstract
The present invention discloses fluid emulation computational methods in a kind of cylinder, including：The occluding surface for surrounding each part of fluid in cylinder is modeled in three-dimensional artificial software；Mesh generation is carried out to the model of foundation, and dynamic grid model is formed according to valve motion parameter；To dynamic grid model loading cycle transient state boundary condition, and calculate according to built-in algorithms the transient state tumble flow when concentration distribution of fluid in cylinder.After the present invention is to surrounding the occluding surface modeling of each part of fluid in cylinder, carry out mesh generation and form grid model, the dynamic grid model for motion analysis is formed further according to valve motion parameter, fluid is moved in dynamic grid model by under the promotion of period transient state boundary condition in cylinder, simulates the motion state of engine fluid in cylinder under actual motion state.Period calculates the transient state Tumble and swirl and concentration distribution of fluid in cylinder according to built-in algorithms, reflects cylinder fluid movement during engine actual motion, embodies in cylinder fluid with the change of crank angle.
Description
Technical field
The present invention relates to emulation air flue design technical field, fluid emulation computational methods in more particularly to a kind of cylinder.
Background technology
As constantly rising violently for international oil price is increasingly strict with Abgasgesetz, the I. C engine combustion system of high-efficiency low-pollution
Exploitation receive much concern.Working fluid flow has important meaning to the dynamic property, economy and discharge performance of internal combustion engine in internal combustion engine
Justice because it to air-fuel mixture, delay period, catch fire, burn, flame propagation, emission formation and wet wall suffer from it is important
Influence.Therefore it is necessary means that application software, which calculates related cylinder interior air-flow tissue and spray characteristics,.
Tumble flow is widely used on four-air valve petrol engine, and tumble flow its momentum decay in compression process is less, when piston connects
During nearly top dead centre, the tumble flow of large scale will be broken into the whirlpool of numerous small yardsticks, increases turbulence intensity, provides flame propagation significantly
Speed, improve engine performance.Air flue tumble flow can use steady state test platform to obtain at present, fixed air flue inlet outlet pressure differential, obtain
Obtain the Tumble intensity under different air valve lift.In rating test, injection timing is at interval of 10 DEG C of A, with reference to different fuel injection parameters,
Oil spout experimental matrix is formed, experimental amount is huge.
However, although stable state flow bench can produce the strong of tumble flow with parallel more different air flues to a certain extent
Cylinder fluid movement when spending, but engine actual motion can not be reflected, it is impossible to embody cylinder fluid movement with crank angle
Change.
The content of the invention
It is an object of the invention to provide fluid emulation computational methods in a kind of cylinder, when can reflect engine actual motion
Cylinder fluid movement, embody change of the cylinder fluid movement with crank angle.
In order to solve the above technical problems, the present invention provides fluid emulation computational methods in a kind of cylinder, including：
The occluding surface for surrounding each part of fluid in cylinder is modeled in three-dimensional artificial software；
Mesh generation is carried out to the model of foundation, and dynamic grid model is formed according to valve motion parameter；
To the dynamic grid model loading cycle transient state boundary condition, and according to the wink of fluid in built-in algorithms calculating cylinder
State tumble flow when concentration distribution.
Preferably, the occluding surface for surrounding each part of fluid in cylinder is modeled, specifically included：
To being connect on air intake duct, exhaust duct, inlet valve, exhaust valve, cylinder, piston, fuel injector and spark plug with fluid in cylinder
Tactile surface modeling.
Preferably, before to the dynamic grid model loading cycle transient state boundary condition, in addition to：
In the dynamic grid model, the top surface of the piston is adjusted to the clearance between the end face of the cylinder, so that
The compression ratio of the cylinder reaches preset value.
Preferably, the period transient state boundary condition of dynamic grid model loading is specifically included：
The inlet mouth flow and temperature changed with crank rotation, and the exhaust changed with crank rotation are said
Mouth transient state static pressure and temperature.
Preferably, to also including before the dynamic grid model loading cycle transient state boundary condition：
Spray model is demarcated according to spray characteristics.
Preferably, the spray characteristics include Spray penetration distance, spray discharge pattern and Sauter mean diameter.
Preferably, to also including before the dynamic grid model loading cycle transient state boundary condition：
Set each nozzle opening coordinate of the fuel injector, oily Shu Fangxiang, oil spout bore dia, the oil spout beginning and ending time, distributive value,
Particle diameter distribution and oil droplet jet velocity.
Preferably, when concentration distribution also includes the transient state tumble flow of fluid afterwards in calculating cylinder：
Injection strategy of the fuel injector in the oil spout stage is determined according to the transient state Tumble and swirl.
Preferably, when concentration distribution also includes the transient state tumble flow of fluid afterwards in calculating cylinder：
Concentration at the spark-plug location is calculated according to the concentration distribution of fluid in cylinder.
Preferably, when concentration distribution also includes the transient state tumble flow of fluid afterwards in calculating cylinder：
According to the wet wall of concentration distribution prediction cylinder sleeve of fluid in cylinder and the probability of occurrence of the wet wall of piston.It is provided by the present invention
Fluid emulation computational methods in cylinder, mainly include three steps, be respectively：To each portion of fluid in encirclement cylinder in three-dimensional artificial software
The occluding surface modeling of part；Mesh generation is carried out to the model of foundation, and dynamic grid model is formed according to valve motion parameter；
To the dynamic grid model loading cycle transient state boundary condition, and according to the transient state Tumble and swirl of fluid in built-in algorithms calculating cylinder
And concentration distribution.
Wherein, in the first step, main contents are the modeling of occluding surface.Fluid is not only in gas In-Cylinder Flow in cylinder, and
From its cradle --- inlet valve to its end --- exhaust valve is all present, while to also relate to remaining each in it flows way
The part of fluid in cylinder kind is surrounded, some surface of these parts will be in contact with fluid in cylinder, and fluid also can be by cylinder
The influence of each part, this step are that the occluding surface formed of these parts is modeled by three-dimensional artificial software.
In second step, it is contemplated that in engine actual motion, its valve moves at any time, including valve stroke is with song
The rotation of axle and change, the flowing of fluid is with being actually consistent to make in cylinder, the envelope in this step first to being established in the first step
Closed surface model carries out mesh generation, the grid model with several pieces small volume units is formed, then again to the grid model
It is modified and refines according to the kinematic parameter of valve, forms dynamic grid model.The dynamic grid model is fluid in cylinder
Motion analysis model.
In the third step, main contents are that the relevant parameter of fluid in cylinder calculates.The motion of fluid needs to consider shadow in cylinder
Ring the factor of flowing of driving, the factor is period transient state boundary condition, that is, the physical parameter changed over time, and the time
Change is embodied in the rotation of bent axle, and these physical parameters can always promote and interfere the motion of fluid in cylinder.In this way, flowed in cylinder
Body, by under the promotion of period transient state boundary condition, constantly moves in dynamic grid model, in the process can root
The kinematic parameter of fluid in cylinder, generally transient state Tumble and swirl and concentration distribution are calculated according to the built-in algorithms of three-dimensional artificial software.
In summary, fluid emulation computational methods in cylinder provided by the present invention, to surrounding each part of fluid in cylinder
After occluding surface modeling, mesh generation is carried out, grid model is formed, is formed further according to valve motion parameter for motion analysis
Dynamic grid model, the physical parameter condition then changed to dynamic grid model loading with crank rotation so that in cylinder
Fluid constantly changes, and can calculate the transient state Tumble and swirl and concentration distribution of fluid in cylinder according to built-in algorithms in the process, such as
This reflects cylinder fluid movement during engine actual motion, embodies change of the cylinder fluid movement with crank angle.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is the flow chart of fluid emulation computational methods in cylinder provided by the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Fig. 1 is refer to, Fig. 1 is the flow chart of fluid emulation computational methods in cylinder provided by the present invention.
In a kind of embodiment provided by the present invention, fluid emulation computational methods mainly include three steps in cylinder,
Respectively：The occluding surface for surrounding each part of fluid in cylinder is modeled in three-dimensional artificial software；The model of foundation is carried out
Mesh generation, and dynamic grid model is formed according to valve motion parameter；To the dynamic grid model loading cycle transient state side
Boundary's condition, and calculate according to built-in algorithms the transient state tumble flow when concentration distribution of fluid in cylinder.
Wherein, in the first step, main contents are the modeling of occluding surface.Fluid is not only in gas In-Cylinder Flow in cylinder, and
From its cradle --- inlet valve to its end --- exhaust valve is all present, while to also relate to remaining each in it flows way
The part of fluid in cylinder kind is surrounded, some surface of these parts will be in contact with fluid in cylinder, and fluid also can be by cylinder
The influence of each part, this step are that the occluding surface formed of these parts is modeled by three-dimensional artificial software.
So after modeling, the maximum fluidity scope of fluid is exactly the space that is surrounded of occluding surface of each part in cylinder.And used in modeling
Software can be three-dimensional CAD digital-to-analogue etc..
And surround each part of fluid in cylinder, mainly including air intake duct, exhaust duct, inlet valve, exhaust valve, cylinder, piston,
Fuel injector and spark plug etc..The surface contacted that may connect in theory be present with fluid in cylinder on these parts and belong to this step
The object of middle modeling, such as surface of the inwall of the inwall of the inwall of air intake duct, exhaust duct, displacement, piston etc..
In second step, it is contemplated that in engine actual motion, its valve moves at any time, including valve stroke is with song
The rotation of axle and change, the direction of motion of valve changes etc., the flow regime of fluid is with being actually consistent to make in cylinder, in this step
Mesh generation is carried out to the occluding surface model established in the first step first, forms the grid mould with several pieces small volume units
Type, then the grid model is modified and refined according to the kinematic parameter of valve again, form dynamic grid model.The dynamic
Grid model is the motion analysis model of fluid in cylinder.
In the third step, main contents are that the relevant parameter of fluid in cylinder calculates.The motion of fluid needs to consider shadow in cylinder
Ring the factor of flowing of driving, the factor is period transient state boundary condition, that is, the physical parameter changed over time, and the time
Change is embodied in the rotation of bent axle, and these physical parameters can always promote and interfere the motion of fluid in cylinder.In this way, flowed in cylinder
Body, by under the promotion of period transient state boundary condition, constantly moves in dynamic grid model, in the process can root
The kinematic parameter of fluid in cylinder, generally transient state Tumble and swirl and concentration distribution are calculated according to the built-in algorithms of three-dimensional artificial software.
Herein preferably, the period transient state boundary condition in this implementation mainly includes the air intake duct changed with crank rotation
Inlet flow rate and temperature, and the exhaust duct outlet transient state static pressure and temperature changed with crank rotation.Four physical parameters
It is to start change with the rotation of bent axle, suffered by In-Cylinder Flow spraying when so simulating engine actual motion
The environment as caused by crank rotation influence.Certainly, period transient state boundary condition and aforementioned four physical parameter is not only included, its
It is remaining equally to change with crank rotation and on the influential physical parameter of In-Cylinder Flow spraying, equally may be embodied in interior.
In this way, in cylinder oil droplet in dynamic grid model by constantly spreading, touch under the promotion of period transient state boundary condition
Hit, crush, evaporating and with air mixing etc., simulate engine under actual motion state, the motion state of fluid in cylinder.This
When, in dynamic grid model, the motion state of fluid is clear knowable in cylinder, so can be according to three-dimensional artificial software
Built-in algorithms are calculated motion state parameterses of the fluid in cylinder in dynamic grid model, and the motion state parameterses mainly wrap
Include the transient state Tumble and swirl of fluid in cylinder and the concentration distribution in dynamic grid model.
In summary, fluid emulation computational methods in cylinder provided by the present invention, to surrounding each part of fluid in cylinder
After occluding surface modeling, mesh generation is carried out, grid model is formed, is formed further according to valve motion parameter for motion analysis
Dynamic grid model, the physical parameter condition then changed to dynamic grid model loading with crank rotation so that in cylinder
Fluid constantly changes, and can calculate the transient state Tumble and swirl and concentration distribution of fluid in cylinder according to built-in algorithms in the process, such as
This reflects cylinder fluid movement during engine actual motion, embodies change of the cylinder fluid movement with crank angle.
In addition, to improve the accuracy of fluid emulation result of calculation in cylinder, it is set to be more nearly the actual motion of engine
State, the present embodiment can also carry out step before to dynamic grid model loading cycle transient state boundary condition：In dynamic grid
In model, the top surface of piston is adjusted to the clearance between the end face of cylinder.Clearance refers to due to the side such as structure, manufacture, assembling, operating
The needs in face, certain space or gap are left in some positions in cylinder, and this segment space or gap are referred to as into clearance volume.This
When being that piston movement instroke ends in embodiment, the gap between its end face and cylinder end face.By adjusting the clearance
Value, it can be made to improve or reduce, so as to adjust the compression ratio of cylinder, and reach preset value with the stroke of regulating piston.This is default
It is worth for according to compression ratio during engine actual motion state.
In addition, before to dynamic grid model loading cycle transient state boundary condition, step can be also carried out：It is special according to spraying
Property demarcation spray model.Fluid mainly includes air and fuel droplets, and both formed fuel-air mixtures of mixing in cylinder,
Because partial parameters of the spray model in three-dimensional artificial software are default value, further to improve the accuracy of simulation calculation,
Need to demarcate spray model before loading cycle transient state boundary condition.Specifically, spraying bullet experiment is can refer to, according to
Spray characteristics, Spray penetration distance, Sauter mean diameter, spray discharge pattern etc. are generally comprised, adjust the relevant parameter in spray model,
Spray characteristics are made to be consistent with actual conditions.
Based on same consideration, before to dynamic grid model loading cycle transient state boundary condition, step can be also carried out：
Set each nozzle opening coordinate of fuel injector, oily Shu Fangxiang, oil spout bore dia, the oil spout beginning and ending time, distributive value, particle diameter distribution and
Oil droplet jet velocity.The main contents of this step are the relevant parameter adjustment of the fuel injector in dynamic grid model, make it dynamic
State in state grid model is consistent with actual conditions.
Moreover, the transient state tumble flow of fluid in cylinder is being calculated when after concentration distribution, can also be by calculating
Transient state Tumble and swirl determine Injection strategy of the fuel injector in the oil spout stage, such as injection time, oil injection duration, to Injection strategy
Reference is provided., can also be by the cylinder that calculates in addition, calculating the transient state tumble flow of fluid in cylinder when after concentration distribution
The concentration distribution of interior fluid accurately calculates the concentration at the spark-plug location in dynamic grid model, so as to the igniting for spark plug
The offer reference such as time, it is ensured that theory is lighted a fire successfully.
Meanwhile the transient state tumble flow of fluid in cylinder is being calculated when after concentration distribution, can also be by the cylinder that calculates
The concentration distribution of interior fluid, using wall membrane modle, predict the possibility of wet wall in cylinder, i.e. probability of occurrence.Such as can be according in cylinder
The concentration distribution of fluid judges the probability of occurrence of the wet wall of cylinder sleeve, the wet wall of piston or the wet wall of valve etc..
To the described above of disclosed case study on implementation, professional and technical personnel in the field are enable to realize or use this hair
It is bright.A variety of modifications to these embodiments will be apparent for those skilled in the art, determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, originally
Invention is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein and features of novelty
Consistent most wide scope.
Claims (10)
- A kind of 1. fluid emulation computational methods in cylinder, it is characterised in that including：The occluding surface for surrounding each part of fluid in cylinder is modeled in three-dimensional artificial software；Mesh generation is carried out to the model of foundation, and dynamic grid model is formed according to valve motion parameter；Rolled to the dynamic grid model loading cycle transient state boundary condition, and according to the transient state of fluid in built-in algorithms calculating cylinder Flow when concentration distribution.
- 2. fluid emulation computational methods in cylinder according to claim 1, it is characterised in that each portion to surrounding fluid in cylinder The occluding surface modeling of part, is specifically included：To what is contacted on air intake duct, exhaust duct, inlet valve, exhaust valve, cylinder, piston, fuel injector and spark plug with fluid in cylinder Surface modeling.
- 3. fluid emulation computational methods in cylinder according to claim 2, it is characterised in that add to the dynamic grid model Before load period transient state boundary condition, in addition to：In the dynamic grid model, the top surface of the piston is adjusted to the clearance between the end face of the cylinder, so that described The compression ratio of cylinder reaches preset value.
- 4. fluid emulation computational methods in cylinder according to claim 3, it is characterised in that add to the dynamic grid model The period transient state boundary condition of load specifically includes：The inlet mouth flow and temperature changed with crank rotation, and the exhaust duct outlet wink changed with crank rotation State static pressure and temperature.
- 5. fluid emulation computational methods in cylinder according to claim 4, it is characterised in that add to the dynamic grid model Also include before load period transient state boundary condition：Spray model is demarcated according to spray characteristics.
- 6. fluid emulation computational methods in cylinder according to claim 5, it is characterised in that the spray characteristics include spraying Through away from, spray discharge pattern and Sauter mean diameter.
- 7. fluid emulation computational methods in cylinder according to claim 6, it is characterised in that add to the dynamic grid model Also include before load period transient state boundary condition：Each nozzle opening coordinate, oily Shu Fangxiang, oil spout bore dia, oil spout beginning and ending time, distributive value, the particle diameter of the fuel injector are set Distribution and oil droplet jet velocity.
- 8. fluid emulation computational methods in cylinder according to claim 7, it is characterised in that calculate the transient state rolling of fluid in cylinder When concentration distribution also includes stream afterwards：Injection strategy of the fuel injector in the oil spout stage is determined according to the transient state Tumble and swirl.
- 9. fluid emulation computational methods in cylinder according to claim 8, it is characterised in that calculate the transient state rolling of fluid in cylinder When concentration distribution also includes stream afterwards：Concentration at the spark-plug location is calculated according to the concentration distribution of fluid in cylinder.
- 10. fluid emulation computational methods in cylinder according to claim 9, it is characterised in that calculate the transient state of fluid in cylinder When concentration distribution also includes tumble flow afterwards：According to the wet wall of concentration distribution prediction cylinder sleeve of fluid in cylinder and the probability of occurrence of the wet wall of piston.
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Cited By (3)
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| CN113792449A (en) * | 2021-08-10 | 2021-12-14 | 中国船舶重工集团公司第七一九研究所 | Nuclear reactor monitoring method and system |
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