CN108072526A - A kind of controlled turbulent generating means for fast press - Google Patents
A kind of controlled turbulent generating means for fast press Download PDFInfo
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- CN108072526A CN108072526A CN201711207311.5A CN201711207311A CN108072526A CN 108072526 A CN108072526 A CN 108072526A CN 201711207311 A CN201711207311 A CN 201711207311A CN 108072526 A CN108072526 A CN 108072526A
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- inlet duct
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
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- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The present invention relates to a kind of controlled turbulent generating means for fast press, the tangential inlet duct being connected including the port with cylinder body, the air inlet pipeline, solenoid electric valve, velocity sensor and the control module that are connected with the other end of tangential inlet duct.The tangential inlet duct can select in a set of tangential inlet duct for having different angles and having demarcated；By selecting the tangential inlet duct of different angles, turbulent motion in different various forms of cylinders based on eddy motion or based on tumble motion is generated；Host computer controls Electromagnetic Control valve opening by PLC control unit, so as to the intake velocity of gas in control pipeline, to generate the turbulent motion of different turbulence intensities；Velocity sensor is measuring the air-flow velocity in cylinder.
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, is had
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 generate larger harm to the living environment of people.Vast researcher is for upper
The problem of stating proposes the solution routes 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 infrastests 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 Xun Huan, and fluid carries out the turbulent motion of extremely complex and strong transition always in 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 the combustion characteristics there are turbulent motion in cylinder is carried out exploitation and
The fast press experimental stand of research.Therefore, design is a kind of can control turbulence form and turbulence intensity, and overall system structure is simpler
Single device, exploitation and research to fast press be there is an urgent need to.
The content of the invention
Turbulence form and turbulence intensity and the better simply device of overall structure can be controlled the object of the present invention is to provide a kind of,
The combustion characteristics there are turbulent motion in cylinder is developed and studied based on fast press.Technical solution is as follows：
A kind of controlled turbulent generating means for fast press are fixed on fast press cylinder body, including with cylinder body into row
Tangential inlet duct that stomata is connected, air inlet pipeline, solenoid electric valve and the control module being connected with the other end of tangential inlet duct,
Wherein,
Tangent tangential inlet duct is to generate the turbulent motion in cylinder with combustion chamber, if α is perpendicular to cylinder-bore axis
Plane on, the angle of tangential inlet duct axis and air inlet axially bored line, β is the plane where cylinder-bore axis and air inlet axially bored line
On, the angle of air intake duct tangential direction and air admission hole axis direction, the tangential inlet duct can it is a set of have different angles and
It is selected in the tangential inlet duct demarcated；By selecting the tangential inlet duct of different angle α angles and β angles, generation is different
Various forms of cylinders based on eddy motion or based on tumble motion in turbulent motion；
The control module includes PLC control unit, host computer, and host computer controls Electromagnetic Control by PLC control unit
Valve opening, so as to the intake velocity of gas in control pipeline, to generate the turbulent motion of different turbulence intensities.
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 the turbulent motion of various form and intensity in fast press combustion chamber, as rolled in gasoline engine
Leading turbulent motion is vortexed in the leading turbulent motion of stream or diesel engine.By replace the tangential admission pipeline of different angle with
And adjust intake velocity, it can be achieved that in cylinder turbulence form and turbulence intensity adjusting.
Description of the drawings
Fig. 1 is turbulent flow generating means primary structure simplified schematic diagram in the present invention
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
Specific 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
Specific 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 for fast press of the invention, including tangential inlet duct 4, electromagnetism
Control valve 5 and control module.The port 6 of the fast press experimental provision combustion chamber unit and tangential admission shown in FIG. 1
Road 4 is connected.The tangential inlet duct 4 is circular tube shaped, and the connection of tangential inlet duct 4 and port 6, air inlet pipeline 1, which relies on, to be connected
Several through holes on fishplate bar 2 are completed, and the arrangement of the through hole meets：Through hole is uniformly distributed around pipeline center.The via count
It measures as four.The control module includes PLC control unit, host computer and velocity sensor, host computer and PLC control unit phase
Even, PLC control unit is connected with velocity sensor；According to different tangential inlet ducts 4, by the test system carried in host computer
And PLC control unit 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 motions 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 vortex intensity 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 forepart 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 by unloading load hydraulic, by brake piston connecting rod 12 flat-head piston 11 is promoted quickly to move
It is dynamic, it compresses by burning mixture in driving cylinder cylinder body 10, makes up to high-temperature high-pressure state and burn, for image and data
Acquisition.
The present invention operation principle be：Mainly using control module and turbulent flow generating structure, intake velocity is controlled 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 duct 4 is replaced, reach predetermined target turbulence intensity and turbulence form.
The fast press experiment porch applied using the present invention is strong if you need to adjust turbulent flow in cylinder after once testing
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
It fills and tightens 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 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)；V-expression kinematic viscosity (v=
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 number, by different turbulence forms be divided into A,
B, C etc. is several.According to the governing equation of turbulence intensityUnder other parameter 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 different turbulence intensities and the Electromagnetic Control valve opening 5 and tangential admission corresponding to form after the completion of test
It numbers 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 which that initial stage test experiments, tangential inlet duct is replaced in installation, and by external 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 implementations
Mode, above-mentioned specific embodiment are 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 controlled turbulent generating means for fast press are fixed on fast press cylinder body, including the intake and exhaust with cylinder body
Tangential inlet duct that hole is connected, air inlet pipeline, solenoid electric valve and the control module being connected with the other end of tangential inlet duct,
In,
Tangent tangential inlet duct is to generate the turbulent motion in cylinder with combustion chamber, if α is perpendicular to the flat of cylinder-bore axis
On face, the angle of tangential inlet duct axis and air inlet axially bored line, β be where cylinder-bore axis and air inlet axially bored line in plane, into
The angle of air flue tangential direction and air admission hole axis direction, the tangential inlet duct can have different angles and demarcated a set of
It is selected in good tangential inlet duct；By selecting the tangential inlet duct of different angle α angles and β angles, generate different with whirlpool
Stream movement based on or various forms of cylinders based on tumble motion in turbulent motion；
The control module includes PLC control unit, host computer, and host computer controls solenoid electric valve to open by PLC control unit
Degree, so as to the intake velocity of gas in control pipeline, to generate the turbulent motion of different turbulence intensities.
2. controlled turbulent generating means according to claim 1, which is characterized in that solenoid electric valve is arranged at port
Between 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 |
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| CN201711207311.5A CN108072526A (en) | 2017-11-27 | 2017-11-27 | A kind of controlled turbulent generating means for fast press |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711207311.5A CN108072526A (en) | 2017-11-27 | 2017-11-27 | A kind of controlled turbulent generating means for fast press |
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| CN108072526A true CN108072526A (en) | 2018-05-25 |
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| CN201711207311.5A Pending CN108072526A (en) | 2017-11-27 | 2017-11-27 | A kind of controlled turbulent generating means for fast press |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5913554A (en) * | 1995-05-15 | 1999-06-22 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Intake system construction for internal combustion engine and manufacturing process of intake passage section of internal combustion engine |
| CN101514941A (en) * | 2009-04-03 | 2009-08-26 | 北京工业大学 | Fast compressing expansion machine in process of studying combustion process of engine |
| CN101694416A (en) * | 2009-08-21 | 2010-04-14 | 重庆长安汽车股份有限公司 | Air way of engine cylinder head and device for detecting and simulating performance of combustion chamber |
| CN105952554A (en) * | 2016-04-15 | 2016-09-21 | 天津大学 | Design method of internal combustion engine tangential air way structure all parameters |
| CN106168540A (en) * | 2016-08-09 | 2016-11-30 | 天津大学 | Can flexible flowing pressure ripple burning interact visualization combustor |
| CN106441911A (en) * | 2016-06-29 | 2017-02-22 | 中国北方发动机研究所(天津) | Diesel engine intake swirl adjustable test device |
-
2017
- 2017-11-27 CN CN201711207311.5A patent/CN108072526A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5913554A (en) * | 1995-05-15 | 1999-06-22 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Intake system construction for internal combustion engine and manufacturing process of intake passage section of internal combustion engine |
| CN101514941A (en) * | 2009-04-03 | 2009-08-26 | 北京工业大学 | Fast compressing expansion machine in process of studying combustion process of engine |
| CN101694416A (en) * | 2009-08-21 | 2010-04-14 | 重庆长安汽车股份有限公司 | Air way of engine cylinder head and device for detecting and simulating performance of combustion chamber |
| CN105952554A (en) * | 2016-04-15 | 2016-09-21 | 天津大学 | Design method of internal combustion engine tangential air way structure all parameters |
| CN106441911A (en) * | 2016-06-29 | 2017-02-22 | 中国北方发动机研究所(天津) | Diesel engine intake swirl adjustable test device |
| CN106168540A (en) * | 2016-08-09 | 2016-11-30 | 天津大学 | Can flexible flowing pressure ripple burning interact visualization combustor |
Non-Patent Citations (1)
| Title |
|---|
| 张红光等: "快速压缩机试验台架设计与性能试验", 《农业机械学报》 * |
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Application publication date: 20180525 |