CN108469342A - The experimental system of wall is hit in simulation high speed drop injection - Google Patents
The experimental system of wall is hit in simulation high speed drop injection Download PDFInfo
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- CN108469342A CN108469342A CN201810269257.5A CN201810269257A CN108469342A CN 108469342 A CN108469342 A CN 108469342A CN 201810269257 A CN201810269257 A CN 201810269257A CN 108469342 A CN108469342 A CN 108469342A
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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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Abstract
The present invention relates to combustion in IC engine technical fields, and in particular to the experimental system and method for wall are hit in simulation high speed drop injection.The experimental system of wall is hit in simulation high speed drop injection, including：Spraying high-pressure gas chamber, high pressure gas spray orifice on spraying high-pressure gas cavity wall face, hollow pinhead in high pressure gas spray orifice, hollow pinhead tail portion connects the fluid path of pressure adjustable section, tablet on hollow pinhead liquid drop movement direction, the tablet simulates wall surface, the high-pressure air source system being connected with spraying high-pressure gas chamber；The progress of the present invention compared with the existing technology is：Drop accelerated mode is driven using air pressure, extends the range of drop exit velocities；Enter spraying high-pressure gas chamber internal gas pressure by adjusting, can get the liquid drop speed under fitting engine truth.
Description
Technical field：
The present invention relates to combustion in IC engine technical fields, and in particular to simulation high speed drop injection hit wall experimental system and
Method.
Background technology：
Direct spray petrol engine in cylinder (Gasoline Direct Injection, GDI) can neatly control fuel oil injection and
Mixed Daqu can effectively improve engine thermal efficiency in conjunction with small-sized reinforcement technique, be the master of conventional gasoline machine future development
Want direction.However as the continuous promotion of small-sized reinforcing degree and oil supply system pressure, the phenomenon that fuel impingement wall surface, can not keep away
Exempt from.Fuel impingement combustion chamber wall surface forms oil film, and liquid oil film is difficult to completely burned in combustion so that directly jetting gasoline engine
It is granular material discharged higher.In addition, the fuel oil impinged upon on casing wall is mixed with machine oil, the oil lubricating performance after gasoline cutback
Decline so that the friction between moving component increases.More seriously, into the machine oil of the bags because burning point is low and easy
Spontaneous combustion forms early combustion phenomenon, and easily leads to super detonation, destroys engine key components and parts.
It is lured as it can be seen that the fuel colliding wall phenomenon in directly jetting gasoline engine is the main of Particulate Emission, oil dilution and super detonation
Because, and by stepping up and getting worse with the following injection system pressure, have become further increase engine at present
The efficiency key restriction factors granular material discharged with reduction.Therefore, it is necessary to study fuel droplets to hit wall mechanism, grasps and reasonable
With wall rule is hit, theoretical foundation is provided for more efficient combustion system exploitation design.
In recent years, domestic and international researcher has carried out numerous studies to drop shock wall surface, it is intended to disclose drop and hit wall surface
Development afterwards and Cracking Mechanism.However before generally obtaining using drop freely falling body mode in the experimental study of early period and hit wall
Initial velocity.When drop release altitude increases, since by surrounding air disturbing influence, drop drop point will deviate predeterminated position
(camera focal position) keeps shooting difficult.Therefore the condition that is put to the test limits, the drop obtained in the experimental study method of early period
Hit wall speed (<2m/s) be far smaller than under engine real working condition hit wall speed (>20m/s).More really to reflect engine
Drop is practical to hit wall situation, obtains higher exit velocities, it is necessary to provide a kind of new experimental study system schema.
Invention content：
The technical problem to be solved in the present invention is to provide a kind of injections of high speed drop to hit the experimental system of wall and the side of method
Case.To solve the above problems, the present invention uses following proposal：
The experimental system of wall is hit in simulation high speed drop injection, including：Spraying high-pressure gas chamber is located at spraying high-pressure gas chamber
High pressure gas spray orifice on wall surface, the hollow pinhead being located in high pressure gas spray orifice, hollow pinhead tail portion connect pressure adjustable section
Fluid path, the tablet being located on hollow pinhead liquid drop movement direction, the tablet simulates wall surface, is connected with spraying high-pressure gas chamber
High-pressure air source system；The experimental method of wall is hit in the simulation high speed drop injection realized in above system, is included the following steps：
The pressure for adjusting the fluid path of pressure adjustable section, generates suitable pressure and drop is pushed to hollow pinhead head；
Then it is connected to high-pressure air source system, high pressure gas enters spraying high-pressure gas chamber, and is sprayed by high pressure gas spray orifice
Go out；
It drives the drop high speed for being adhered to syringe needle to fall, to generate the high speed drop needed for experiment, is produced after colliding tablet
The effect of wall is hit in raw simulation high speed drop injection.
One of the preferred embodiment of realization system, the spraying high-pressure gas chamber are formed by a blind hole, with blind hole center line
There is a pair of of through-hole on vertical and intersection direction, be upper through-hole, lower through-hole respectively, the high pressure gas spray orifice is lower through-hole, institute
It states hollow pinhead to penetrate from upper through-hole, syringe needle end is located in lower through-hole；The high-pressure air source system is connected with blind hole aperture.Into
One step, the aperture of the upper through-hole is less than the aperture of lower through-hole；Or the hole length of the upper through-hole is long more than the hole of lower through-hole.
The fluid path of the two of the preferred embodiment of realization system, the pressure adjustable section includes：Syringe pump connects hollow pinhead tail
The connecting tube in portion and syringe pump liquid outlet.
The three of the preferred embodiment of realization system, the high-pressure air source system include being connected successively with spraying high-pressure gas chamber
Solenoid valve, pressure reducing valve, gas cylinder switch, pressure gauge and gas cylinder.
The four of the preferred embodiment of realization system further include：High speed camera system positioned at tablet side realizes high-pressure air source
The synchronizer of system and high speed camera cooperation.
The progress of the present invention compared with the existing technology is：
(1) it uses air pressure to drive drop accelerated mode, extends the range of drop exit velocities；Enter height by adjusting
Air injection chamber internal gas pressure is pressed, the liquid drop speed under fitting engine truth is can get.
(2) in the technical solution of embodiment, since drive of high-pressure gas droplet effect is preferable so that experimental system is set
Timing can reduce hollow pinhead to the vertical range between tablet, keep drop point more stable, convenient for shooting.
(3) easy to control sensitive in the technical solution of embodiment.
Description of the drawings：
Fig. 1 is the system structure diagram in the embodiment of the present invention.
Fig. 2 is mesohigh of embodiment of the present invention air injection chamber along blind hole axis view.
Fig. 3 is Fig. 2 along A-A sectional views, and placed hollow pinhead in upper through-hole and lower through-hole.
Specific implementation mode：
Embodiment：
The experimental system of wall is hit in simulation high speed drop injection, including：Spraying high-pressure gas chamber is located at spraying high-pressure gas chamber
High pressure gas spray orifice on wall surface, the hollow pinhead being located in high pressure gas spray orifice, hollow pinhead tail portion connect pressure adjustable section
Fluid path, the tablet being located on hollow pinhead liquid drop movement direction, the tablet simulates wall surface, is connected with spraying high-pressure gas chamber
High-pressure air source system, be located at tablet side high speed camera system, realize high-pressure air source system coordinate with high speed camera it is same
Walk device；The hollow pinhead is arranged vertically, and flatbed horizontal is placed, and tablet is located at immediately below hollow pinhead；
The spraying high-pressure gas chamber is formed by a blind hole, the high-pressure air source system include successively with spraying high-pressure gas
The connected solenoid valve of chamber, pressure reducing valve, gas cylinder switch, pressure gauge and gas cylinder, the high-pressure air source system and blind hole aperture phase
Even, pressure gauge is used to refer to compression pressure size in gas cylinder, and after gas cylinder switch is opened, gas port passes through high-pressure air pipe
Connection decompression valve inlet, pressure reducing valve are used for the high pressure gas overpressure before electromagnetic valve for adjusting, that is, enter the gas pressure of nozzle, subtract
Pressure valve outlet connects electromagnetic valve entrance by high-pressure air pipe, and electromagnetic valve outlet is connected to blind hole by high-pressure air pipe；With blind hole
There is a pair of of through-hole on the direction of central axis and intersection, be upper through-hole, lower through-hole respectively, the high pressure gas spray orifice is lower logical
Hole, the aperture of the upper through-hole are less than the aperture of lower through-hole, and the hole length of the upper through-hole is long more than the hole of lower through-hole, upper logical in this way
Hole linear loss and local losses are more than lower through-hole, can prevent the compressed gas entered inside blind hole from being overflowed along upper through-hole,
Have an adverse effect to drop acceleration；The hollow pinhead structure uses the structure similar to medical infusion niidl, middle empty needle
Head is penetrated from upper through-hole, and syringe needle end is located in lower through-hole；The fluid path of the pressure adjustable section includes：Syringe pump, connection are hollow
The connecting tube of syringe needle tail portion and syringe pump liquid outlet；Solenoid valve is connect by cable with synchronizer, and synchronizer also passes through electricity
Cable is connected with the camera of high speed camera system, computer, and each unit coordinates is made to run.
The experimental method of wall is hit in the simulation high speed drop injection realized in above system, and the course of work is as follows：
Syringe pump slowly pushes injector push-rod that drop is pushed to hollow pinhead head；
Then shooting instruction is sent out by the computer of high speed camera system, under the action of synchronizer, solenoid valve is simultaneously
It opens, compressed gas quickly enters spraying high-pressure gas chamber, spraying high-pressure gas cavity pressure is made to increase rapidly, due to upper through-hole
Flow resistance is larger, and high pressure gas is then flowed out along the smaller lower through-hole high speed of gas-flow resistance；
It drives the drop high speed for being adhered to syringe needle to fall, to generate the high speed drop needed for experiment, is produced after colliding tablet
The effect of wall is hit in raw simulation high speed drop injection, and high speed camera record hits the image of wall and stores in a computer.
Claims (10)
1. the experimental system of wall is hit in simulation high speed drop injection, which is characterized in that including：Spraying high-pressure gas chamber is located at high pressure
High pressure gas spray orifice on air injection chamber wall surface, the hollow pinhead being located in high pressure gas spray orifice, the connection of hollow pinhead tail portion
The fluid path of pressure adjustable section, the tablet being located on hollow pinhead liquid drop movement direction, the tablet simulates wall surface, with high pressure gas
The connected high-pressure air source system of spray chamber.
2. the experimental system of wall is hit in the injection of simulation high speed drop according to claim 1, which is characterized in that the high pressure gas
Spray chamber is formed by a blind hole, is having a pair of of through-hole on blind hole central axis and the direction that intersects, be respectively upper through-hole, under
Through-hole, the high pressure gas spray orifice are lower through-hole, and the hollow pinhead is penetrated from upper through-hole, and syringe needle end is located in lower through-hole；
The high-pressure air source system is connected with blind hole aperture.
3. the experimental system of wall is hit in the injection of simulation high speed drop according to claim 2, which is characterized in that the upper through-hole
Aperture is less than the aperture of lower through-hole.
4. the experimental system of wall is hit in the injection of simulation high speed drop according to claim 2, which is characterized in that the upper through-hole
Hole length is long more than the hole of lower through-hole.
5. hitting the experimental system of wall according to simulation high speed drop injection described in claim 1-4 any one, which is characterized in that institute
The fluid path for stating pressure adjustable section includes：Syringe pump connects the connecting tube of hollow pinhead tail portion and syringe pump liquid outlet.
6. hitting the experimental system of wall according to simulation high speed drop injection described in claim 1-4 any one, which is characterized in that institute
It includes solenoid valve, pressure reducing valve, gas cylinder switch, pressure gauge and the height being connected successively with spraying high-pressure gas chamber to state high-pressure air source system
Air bottle.
7. hitting the experimental system of wall according to simulation high speed drop injection described in claim 1-4 any one, which is characterized in that also
Including：High speed camera system positioned at tablet side；Realize the synchronizer of high-pressure air source system and high speed camera cooperation.
8. the experimental system of wall is hit in the injection of simulation high speed drop according to claim 1, which is characterized in that further include：It is located at
The high speed camera system of tablet side realizes the synchronizer of high-pressure air source system and high speed camera cooperation；The hollow pinhead hangs down
Straight arrangement, flatbed horizontal are placed, and tablet is located at immediately below hollow pinhead；
The spraying high-pressure gas chamber is formed by a blind hole, the high-pressure air source system include successively with spraying high-pressure gas chamber phase
Solenoid valve even, pressure reducing valve, gas cylinder switch, pressure gauge and gas cylinder, the high-pressure air source system are connected with blind hole aperture；
There is a pair of of through-hole on blind hole central axis and the direction that intersects, is upper through-hole, lower through-hole, the high pressure gas spray orifice respectively
For lower through-hole, the aperture of the upper through-hole is less than the aperture of lower through-hole, and the hole length of the upper through-hole is long more than the hole of lower through-hole；Institute
It states hollow pinhead to penetrate from upper through-hole, syringe needle end is located in lower through-hole；The fluid path of the pressure adjustable section includes：Syringe pump,
Connect the connecting tube of hollow pinhead tail portion and syringe pump liquid outlet；Solenoid valve is connect by cable with synchronizer, synchronizer
Also it is connected with the camera of high speed camera system, computer by cable, each unit coordinates is made to run.
9. the experimental method of wall is hit in the simulation high speed drop injection realized in the experimental system described in claim 1, feature exists
In comprising the following processes：
The pressure for adjusting the fluid path of pressure adjustable section, generates suitable pressure and drop is pushed to hollow pinhead head；
Then it is connected to high-pressure air source system, high pressure gas enters spraying high-pressure gas chamber, and is sprayed by high pressure gas spray orifice；
It drives the drop high speed for being adhered to syringe needle to fall, to generate the high speed drop needed for experiment, mould is generated after colliding tablet
The effect of wall is hit in quasi- high speed drop injection.
10. the experimental method of wall is hit in the simulation high speed drop injection realized in the experimental system described in claim 8, feature exists
In comprising the following processes：
Syringe pump slowly pushes injector push-rod that drop is pushed to hollow pinhead head；
Then the computer of high speed camera system sends out shooting instruction, and under the action of synchronizer, solenoid valve opens simultaneously, compression
Gas quickly enters spraying high-pressure gas chamber, and spraying high-pressure gas cavity pressure is made to increase rapidly；Due to upper flow therethrough resistance
Larger, high pressure gas is then flowed out along the smaller lower through-hole high speed of gas-flow resistance；
It drives the drop high speed for being adhered to syringe needle to fall, to generate the high speed drop needed for experiment, mould is generated after colliding tablet
The effect of wall is hit in quasi- high speed drop injection, and high speed camera record hits the image of wall and stores in a computer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810269257.5A CN108469342A (en) | 2018-03-28 | 2018-03-28 | The experimental system of wall is hit in simulation high speed drop injection |
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| CN201810269257.5A CN108469342A (en) | 2018-03-28 | 2018-03-28 | The experimental system of wall is hit in simulation high speed drop injection |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109781379A (en) * | 2019-01-14 | 2019-05-21 | 北京理工大学 | The experimental provision and method of oscillating flat plate Fracture law are hit for studying drop |
| CN113588497A (en) * | 2021-08-02 | 2021-11-02 | 安徽工程大学 | Experimental device for be used for studying liquid drop evolution process under impact |
| CN115112651A (en) * | 2022-06-09 | 2022-09-27 | 西北工业大学 | Test method and device for molten aluminum droplet collision behavior pattern based on shadow shooting technology |
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| CN106885686A (en) * | 2017-03-20 | 2017-06-23 | 华中科技大学 | A kind of drop hits at a high speed the experimental rig of wall |
| CN106989933A (en) * | 2017-06-02 | 2017-07-28 | 北京理工大学 | A kind of rebuffed experimental provision of drop and method |
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Patent Citations (6)
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| US4787404A (en) * | 1987-06-12 | 1988-11-29 | International Business Machines Corporation | Low flow rate-low pressure atomizer device |
| WO1995007765A1 (en) * | 1993-09-15 | 1995-03-23 | Mobium Enterprises, Inc. | Hybrid pulsed valve for thin film coating and method |
| CN104729792A (en) * | 2015-02-15 | 2015-06-24 | 北京航空航天大学 | Measuring device for high-speed multi-direction impact loads of liquid drips |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109781379A (en) * | 2019-01-14 | 2019-05-21 | 北京理工大学 | The experimental provision and method of oscillating flat plate Fracture law are hit for studying drop |
| CN113588497A (en) * | 2021-08-02 | 2021-11-02 | 安徽工程大学 | Experimental device for be used for studying liquid drop evolution process under impact |
| CN113588497B (en) * | 2021-08-02 | 2024-02-23 | 安徽工程大学 | Experimental device for be used for studying drop evolution process under impact effect |
| CN115112651A (en) * | 2022-06-09 | 2022-09-27 | 西北工业大学 | Test method and device for molten aluminum droplet collision behavior pattern based on shadow shooting technology |
| CN115112651B (en) * | 2022-06-09 | 2024-05-10 | 西北工业大学 | Method and device for testing wall collision behavior mode of burning aluminum liquid drop based on shadow shooting technology |
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Application publication date: 20180831 |