CN108035814A - A kind of turbulence control method for fast press - Google Patents
A kind of turbulence control method for fast press Download PDFInfo
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- CN108035814A CN108035814A CN201711208586.0A CN201711208586A CN108035814A CN 108035814 A CN108035814 A CN 108035814A CN 201711208586 A CN201711208586 A CN 201711208586A CN 108035814 A CN108035814 A CN 108035814A
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- cylinder
- inlet duct
- tangential inlet
- turbulence
- motion
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D2041/0015—Controlling intake air for engines with means for controlling swirl or tumble flow, e.g. by using swirl valves
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The present invention relates to a kind of turbulence control method for fast press, used controlled turbulent generating means are fixed on fast press cylinder body, the tangential inlet duct being connected including the port with cylinder body, the air inlet pipeline, solenoid electric valve and the control module that are connected with the other end of tangential inlet duct, tangent tangential inlet duct can select to generate the turbulent motion in cylinder in a set of tangential inlet duct for having different angles and having demarcated with combustion chamber；Control method is：According to required turbulence form, the tangential inlet duct of selected corresponding construction simultaneously installs controlled turbulent generating means, with turbulent motion in the different various forms of cylinders based on eddy motion or based on tumble motion of generation.
Description
Technical field
The present invention is a kind of controlled turbulent generating means for fast press, is related to combustion in IC engine and fluid applications, tool
Body is related to the infrastest device for studying fuel characteristic and new combustion mode characteristic.
Background technology
The increase of car ownership, while making tremendous contribution for Chinese society development, also consumes substantial amounts of oil
Resource, gives off a large amount of pernicious gases, so as to produce larger harm to the living environment of people.Vast researcher is for upper
The problem of stating proposes the solution route such as Development of Novel substitute Fuel of Internal Combustion Engine and new combustion mode, and invents and have studied constant volume combustion
Burn the infrastest devices such as bullet, fast press.However, Modern Internal-Combustion Engine combustion process and its optimizing research face many basic science
Problem and technical bottleneck, such as combustion knock abnormal combustion phenomenon.Therefore, as can be the new substitute fuel of internal combustion engine and
New combustion mode provides the fast press experimental provision of theoretical research and experimental vehicle, there is its necessity studied.
IC engine cylinder flow field structure and turbulence characteristic are one of most important factors for controlling combustion process of the internal-combustion engine, inside
Combustion engine is entirely in circulation, and fluid carries out the turbulent motion of extremely complex and strong transition all the time in its cylinder.In IC engine cylinder
Turbulent motion to the biography in cylinder in physical and chemical process, the concentration of combustion mixture, flame propagation velocity and combustion quality, cylinder
The formation of heat and pollutant all has the influence of directly essence.Therefore internal combustion engine is in different turbulence forms and different turbulence intensities
Under combustion process research, to I. C engine combustion system exploitation with research have very important meaning.
Fast press major function is compression and the ignition process simulated inside internal-combustion piston engine, be it is a kind of preferably between
Study of Support between theory analysis and practical application.Therefore, fast press has in research cylinder the problems such as turbulent combustion such as pinking
Significance.Found through consulting literatures data, have no it is related combustion characteristics in cylinder there are turbulent motion is carried out exploitation and
The fast press experimental stand of research.Therefore, design one kind can control turbulence form, and the better simply device of overall system structure,
Exploitation to fast press and research be there is an urgent need to.
The content of the invention
The object of the present invention is to provide a kind of turbulence control method that can control turbulence form and intensity, to based on fast pressure
Machine is developed and studied to the combustion characteristics in cylinder there are turbulent motion.Technical solution is as follows：
A kind of turbulence control method for fast press, used controlled turbulent generating means are fixed on fast press cylinder body
On, including tangential inlet duct, the air inlet pipeline, the electricity that are connected with the other end of tangential inlet duct being connected with the port of cylinder body
Magnetic control valve and control module, tangent tangential inlet duct, can be in a tackling to generate the turbulent motion in cylinder with combustion chamber
Selected in the tangential inlet duct for there are different angles and having demarcated；The control module includes PLC control unit, host computer, on
Position machine by PLC control unit control Electromagnetic Control valve opening so that in control pipeline gas intake velocity, so as to control rapids
Intensity of flow；
The control method of turbulence form is：If α is in the plane perpendicular to cylinder-bore axis, tangential inlet duct axis with into
The angle of stomata axis, its size determine the intensity of eddy motion in cylinder, and angle α is bigger, then strength of vortex is bigger in cylinder；β be
Where cylinder-bore axis and air inlet axially bored line in plane, air intake duct tangential direction and the angle of air admission hole axis direction, its size are determined
Determine the intensity of in-cylinder tumble flow movement, angle beta is bigger, then in-cylinder tumble flow intensity is bigger；According to required turbulence form, phase is selected
Answer the tangential inlet duct of structure and install controlled turbulent generating means, transported with generation difference based on eddy motion or with tumble flow
Turbulent motion in various forms of cylinders based on dynamic.
Preferably, solenoid electric valve is arranged between port and tangential inlet duct.For bi-bit bi-pass closed type gas
High-pressure solenoid valve.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) turbulent motion in IC engine cylinder is introduced in the case of constant present invention can be implemented in swept volume, turbulent flow in cylinder
The formation of movement can make the experimental situation of fast press experiment porch more tend to actual conditions, and the accuracy of experimental data is carried
It is high.
(2) present invention can generate various forms of turbulent motions in fast press combustion chamber, as tumble flow is dominated in gasoline engine
Turbulent motion or diesel engine in be vortexed leading turbulent motion.By tangential admission pipeline and the adjusting of replacing different angle
Intake velocity, it can be achieved that in cylinder turbulence form and turbulence intensity adjusting.
Brief description of the drawings
Fig. 1 is the turbulent flow generating means primary structure simplified schematic diagram that the present invention uses
Fig. 2 (a) is angle α schematic diagram of the tangential inlet duct 4 on y, z faces with y-axis in Fig. 1
Fig. 2 (b) is angle β schematic diagram of the tangential inlet duct 4 on x, y faces with y-axis in Fig. 1
Fig. 3 is fast press combustion chamber unit and other cell schematics of part in the present invention
In figure：
1- air inlet pipeline 2- connecting plate 3- gasket seals
4- tangential inlet duct 5- solenoid electric valve 6- ports
The fast press cylinder body 8- of 7- are by driving cylinder cylinder cap 9- by driving cylinder head
10- is by driving cylinder cylinder body 11- flat-head piston 12- brake piston connecting rods
13- brake cylinder front cover sealing cover 14- silica glass windows
Embodiment
Technical solution of the present invention is described in further detail with reference to the accompanying drawings and detailed description, but it is of the invention
Embodiment is not limited thereto, this description is not intended to limit the invention.
As shown in Figs. 1-3, the controlled turbulent generating means that the present invention uses, including tangential inlet duct 4, solenoid electric valve 5
And control module.The port 6 of the fast press experimental provision combustion chamber unit is connected with the tangential inlet duct 4 shown in Fig. 1.
The tangential inlet duct 4 is circular tube shaped, and tangential inlet duct 4 and the connection of port 6, air inlet pipeline 1 are relied on connecting plate 2
Some through holes are completed, and the arrangement of the through hole meets：Through hole is uniformly distributed around pipeline center.The number of openings is four.
The control module includes PLC control unit, host computer and velocity sensor, and host computer is connected with PLC control unit, PLC controls
Unit processed is connected with velocity sensor；According to different tangential inlet ducts 4, controlled by the test system and PLC that are carried in host computer
Unit processed determines 5 aperture of solenoid electric valve.
Fig. 2 (a) and Fig. 2 (b) represent tangential inlet duct 4 in the drift angle of three-dimensional, and which determine turbulent motion in cylinder
Form.Fig. 2 (a) is angle α schematic diagram of the tangential inlet duct 4 in z, y plane with y-axis, and the size of angle α decides whirlpool in cylinder
The intensity of movement is flowed, angle α is bigger, then strength of vortex is bigger in cylinder；Fig. 2 (b) for tangential inlet duct 4 in x, y plane with y-axis
Angle β schematic diagrames, the size of angle β decide the intensity of in-cylinder tumble flow movement, and angle beta is bigger, then in-cylinder tumble flow intensity is bigger.
Fig. 3 is the schematic diagram of other units of fast press combustion chamber unit with part in the present invention, from left to right to be driven
Cylinder cylinder cap 8, by driving cylinder head 9, port 6, by driving cylinder cylinder body 10, flat-head piston 11, brake piston connecting rod 12 and system
Dynamic cylinder front cover sealing cover 13, the front portion by driving cylinder head 9 is equipped with quartz glass observation window 14.When gaseous mixture is in premixing tank
Inside after mixing, solenoid electric valve 5 is opened, and the pressure difference of premixing tank and combustion chamber makes homogeneous mixture quickly inject, by cutting
The generation of turbulent flow is realized to the guiding role of air intake duct.Solenoid valve is closed by PLC unit control immediately after the completion of air inlet and is carried out
Compression process, makes air pressure form driving force, promotes flat-head piston 11 quickly to move by brake piston connecting rod 12 by unloading load hydraulic
It is dynamic, compress by burning mixture in driving cylinder cylinder body 10, make up to high-temperature high-pressure state and burn, for image and data
Collection.
The present invention operation principle be：It is main to use control module and turbulent flow generating structure, control intake velocity to control
Turbulence intensity；Using the tangential inlet duct 4 of different angle, with the turbulence form in master cylinder.By changing solenoid electric valve 5
Aperture, and different tangential inlet ducts 4 is replaced, reach predetermined target turbulence intensity and turbulence form.
The fast press experiment porch applied using the present invention, after once testing, it is strong need to such as to adjust turbulent flow in cylinder
Degree and turbulence form, optimum efficiency can be obtained using following methods：
After once testing, the residual gas in combustion chamber is emptied, and sheds the air pressure and braking in driving piston rear
Oil pressure in cylinder；Screw off the attachment screw between tangential inlet duct 4 and its both ends port 6, air inlet pipeline 1；If increase whirlpool
Ratio is flowed, then the swirl ratio demarcated according to experiment to different tangential inlet ducts 4, selects the tangential inlet duct 4 of bigger swirl ratio to pacify
Fill and tighten screw, restart experiment.If reducing swirl ratio, the tangential inlet duct 4 of small swirl ratio is selected.Tumble and swirl
Adjusting it is same as above.
Since 4 form of tangential inlet duct and structural parameters are fixed, under compression ignition moment fixing situation, turbulence intensity is only controlled
In intake velocity.Therefore, the adjusting of turbulence intensity size is realized for the fast press test platform in laboratory using the present invention
Cheng Shi, after once testing, empties the residual gas in combustion chamber and sheds air pressure and oil pressure, by changing PLC control unit
In 5 aperture of solenoid electric valve to change intake velocity, achieve the purpose that to adjust turbulence intensity size in cylinder.
After the completion of turbulence intensity and turbulence form are adjusted, follow-up test is carried out.
(1) evaluation of turbulence intensity
Turbulence intensity is equal to the ratio of turbulence pulsation speed and average speed, is also equal to 0.16 with being calculated by hydraulic diameter
The product of minus eight/first power of the Reynolds number arrived.I.e. formula is as follows：
I=0.16 × (Re)-1/8
Wherein：I-expression turbulence intensity；Re-expression Reynolds number；In addition, Reynolds number equation is as follows：
Wherein：ρ-expression fluid density (Kg/m3)；V-expression mean flow rate (international unit m/s)；D-expression pipe
Diameter (generally characteristic length) (m)；μ-expression fluid kinematic viscosity (Pa/S or N.s/m2)；υ-expression kinematic viscosity (υ=
μ/ρ)(m2/s)；A-expression cross-sectional area (m2)。
(2) control method
The test method in advance of the present invention comprises the following steps：
Step 1, start fast press experimental system in host computer, presetting examination is carried out before official testing；
Step 2, pre- debugging is completed, into the official testing stage；Suitable tangential inlet duct 4 is installed as needed, and
The relevant parameters such as 5 aperture of solenoid valve are inputted in fast press experimental system, system is tested by host computer and PLC control unit determines rapids
Intensity of flow and turbulence form.
Detailed process is：Different tangential inlet ducts 4 in advance defined in PLC with numbering, by different turbulence forms be divided into A,
B, C etc. is several.According to the governing equation of turbulence intensityUnder other specification certain condition, Ke Yitong
5 aperture of solenoid electric valve is overregulated, to reach preferable turbulence intensity.
Step 3, tested for the turbulent flow of different target intensity and form, repeat as above step 2；
Step 4, test is completed, and records test data and chart.
It then can obtain the Electromagnetic Control valve opening 5 and tangential admission corresponding to different turbulence intensities and form after the completion of test
Number in road 4.Therefore, only by adjustment parameter and corresponding tangential inlet duct 4 need to be replaced, target turbulence intensity and form can be obtained
Turbulent motion.
To sum up, the controlled turbulent generating means for fast press of the invention, mainly including tangential inlet duct, Electromagnetic Control
Valve and control module etc..Wherein tangential inlet duct is replaceable dog leg piping, is installed on by connecting plate at port, electricity
Magnetic control valve is installed between port and tangential inlet duct.According to artificial settings, controlled using host computer test system, PLC
Electromagnetic Control valve opening processed and artificially replace tangential inlet duct, by reach desired strength and in the form of turbulent flow.Structure letter of the present invention
It is single, it is only necessary to initial stage test experiments, tangential inlet duct is replaced in installation, and by exterior adjustment parameter, it is strong can to reach target
The turbulent flow of degree and form, to study combustion process under different turbulence intensities and different turbulence forms and characteristic play it is important
Effect.
Although above in conjunction with attached drawing, invention has been described, and the invention is not limited in above-mentioned specific implementation
Mode, above-mentioned embodiment is only schematical, rather than restricted.Those of ordinary skill in the art are at this
Under invention enlightenment, without deviating from the spirit of the invention, many variations, modification and replacement can also be made, these belong to
Within the protection of the present invention.
Claims (2)
1. a kind of turbulence control method for fast press, used controlled turbulent generating means are fixed on fast press cylinder body
On, including tangential inlet duct, the air inlet pipeline, the electricity that are connected with the other end of tangential inlet duct being connected with the port of cylinder body
Magnetic control valve and control module, tangent tangential inlet duct, can be in a tackling to generate the turbulent motion in cylinder with combustion chamber
Selected in the tangential inlet duct for there are different angles and having demarcated；The control module includes PLC control unit and host computer, on
Position machine by PLC control unit control Electromagnetic Control valve opening so that in control pipeline gas intake velocity, to generate difference
The turbulent motion of turbulence intensity；
The control method of turbulence form is：If α is in the plane perpendicular to cylinder-bore axis, tangential inlet duct axis and air admission hole
The angle of axis, its size determine the intensity of eddy motion in cylinder, and angle α is bigger, then strength of vortex is bigger in cylinder；β is in cylinder
Where axis and air inlet axially bored line in plane, air intake duct tangential direction and the angle of air admission hole axis direction, its size decide
The intensity of in-cylinder tumble flow movement, angle beta is bigger, then in-cylinder tumble flow intensity is bigger；According to required turbulence form, corresponding knot is selected
The tangential inlet duct of structure simultaneously installs controlled turbulent generating means, with generation difference based on eddy motion or using tumble motion as
Turbulent motion in main various forms of cylinders.
2. control method according to claim 1, solenoid electric valve are arranged between port and tangential inlet duct.For
Bi-bit bi-pass closed type gas high pressure solenoid valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711208586.0A CN108035814A (en) | 2017-11-27 | 2017-11-27 | A kind of turbulence control method for fast press |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711208586.0A CN108035814A (en) | 2017-11-27 | 2017-11-27 | A kind of turbulence control method for fast press |
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| Publication Number | Publication Date |
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| CN108035814A true CN108035814A (en) | 2018-05-15 |
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| CN201711208586.0A Pending CN108035814A (en) | 2017-11-27 | 2017-11-27 | A kind of turbulence control method for fast press |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201614967U (en) * | 2009-10-22 | 2010-10-27 | 浙江吉利汽车研究院有限公司 | High-tumble air passage |
| CN202360235U (en) * | 2011-11-28 | 2012-08-01 | 天津内燃机研究所 | Intake port structure of small general gasoline engine |
| CN103696868A (en) * | 2013-12-10 | 2014-04-02 | 天津大学 | Internal combustion engine cylinder cover with high eddy ratio or high tumble ratio |
| CN104763539A (en) * | 2015-03-12 | 2015-07-08 | 江苏上淮动力有限公司 | Method for improving air movement in natural gas engine cylinder |
| CN105930574A (en) * | 2016-04-15 | 2016-09-07 | 天津大学 | Genetic and neural network algorithm based design method for air intake port model of internal combustion engine |
| CN106884733A (en) * | 2017-04-14 | 2017-06-23 | 无锡开普机械有限公司 | Air inlet guide frame of the air intake duct in cylinder cover bottom surface |
-
2017
- 2017-11-27 CN CN201711208586.0A patent/CN108035814A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201614967U (en) * | 2009-10-22 | 2010-10-27 | 浙江吉利汽车研究院有限公司 | High-tumble air passage |
| CN202360235U (en) * | 2011-11-28 | 2012-08-01 | 天津内燃机研究所 | Intake port structure of small general gasoline engine |
| CN103696868A (en) * | 2013-12-10 | 2014-04-02 | 天津大学 | Internal combustion engine cylinder cover with high eddy ratio or high tumble ratio |
| CN104763539A (en) * | 2015-03-12 | 2015-07-08 | 江苏上淮动力有限公司 | Method for improving air movement in natural gas engine cylinder |
| CN105930574A (en) * | 2016-04-15 | 2016-09-07 | 天津大学 | Genetic and neural network algorithm based design method for air intake port model of internal combustion engine |
| CN106884733A (en) * | 2017-04-14 | 2017-06-23 | 无锡开普机械有限公司 | Air inlet guide frame of the air intake duct in cylinder cover bottom surface |
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Application publication date: 20180515 |
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