CN105840381A - Natural gas/diesel oil dual fuel injection mixed characteristic research device and control method thereof - Google Patents
Natural gas/diesel oil dual fuel injection mixed characteristic research device and control method thereof Download PDFInfo
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- CN105840381A CN105840381A CN201610157040.6A CN201610157040A CN105840381A CN 105840381 A CN105840381 A CN 105840381A CN 201610157040 A CN201610157040 A CN 201610157040A CN 105840381 A CN105840381 A CN 105840381A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
- F02M43/04—Injectors peculiar thereto
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6402—Atomic fluorescence; Laser induced fluorescence
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Abstract
The invention belongs to the field of internal combustion engine researches and discloses a natural gas/diesel oil dual fuel injection mixed characteristic research device and a control method thereof. The device comprises an injection combiner, a constant volume bomb, a natural gas injector, a diesel oil injector, a gas supply system, an oil supply system, a computer I, an ECU, a laser, a synchronizer, a camera I, a camera II, a reflector and a spectroscope. The natural gas injector and the diesel oil injector are fixedly installed in the injection combiner. The injection combiner is installed at the top of the constant volume bomb. The gas supply system is connected with the natural gas injector. The oil supply system is connected with the diesel oil injector. The ECU controls the natural gas injector and the diesel oil injector to be started or stopped. The computer I controls the laser, the camera I and the camera II to work synchronously through the synchronizer. According to the natural gas/diesel oil dual fuel injection mixed characteristic research device and the control method thereof, dual fuel injection mixing is achieved, clear mist form images are captured through a laser induced fluorescence technique, and a heating unit, a temperature and pressure sensor and an electromagnetic flowmeter are arranged in a pipeline so as to research the influence of the state of fuel on the mist mixed characteristics.
Description
Technical field
The invention belongs to internal combustion engine research field, be specifically related to a kind of Natural Gas & Diesel Dual Fuel Engine injection mixed characteristic research device and
Its control method.
Background technology
Along with industrial consumption and the expansion of personal consumption, energy demand is persistently risen by China, and fossil resource, such as diesel oil, vapour
The problem caused of excessively developing of oil highlights day by day.The energy, the continuous intensification of environmental crisis, had a strong impact on China's economy and
The healthy and rapid development of society.Additionally, Environmental Protection in China regulation is constantly upgraded, state four discharges and implements in full, to Diesel engine
Industry Effect is the biggest.As can be seen here, development and utilization clean energy resource is imperative.Natural gas as the substitute fuel of a kind of cleaning,
The abundantest at the reserves of China.Its main component is methane, and comparing with diesel oil has higher calorific value.Research (SAE981160)
In show, methane is the temperature of spontaneous combustion 1200K to be reached in 2ms, the temperature that can reach far above conventional diesel
(850K～950K), accordingly, it would be desirable to provide energy by spark ignition or diesel oil ignited technology for combustion of natural gas.The most several
Over 10 years, the research of natural gas engine achieves greater advance.Westport company of Canada, BKM Inc. of the U.S. all carries
Go out that " micro-ignition in hydriding bifuel system, provides energy with a small amount of diesel pilot for natural gas.Research (SAE 1999-01-3556)
Find, utilize diesel oil ignited natural gas to be obtained in that relatively low discharge and the higher thermal efficiency, for sky in high pressure direct injection diesel engine
So gas provides effective foundation in in-engine application.Diesel oil ignited natural gas work process is, the most a small amount of at cylinder injection
Diesel oil is as detonator, and diesel oil is compression-ignited formation flame during piston movement to top dead centre, and main fuel natural gas is with relatively subsequently
High pressure sprays into in-cylinder combustion work done.In document (SAE981400), the spraying system that Ouellette et al. mentions be
Increasing a valve pocket in traditional fuel injector, valve pocket had both served as the valve body of diesel injector, had served as again the needle-valve of natural gas injector.
The patent of Publication No. US5996558 proposes the labyrinth utilizing two set nozzles, and cost is high.Domestic special about this respect
Seldom, patent publication No. is a kind of double fuel injection pump and the patent publication No. of the patent proposition of ZL 200410016233.7 to profit
The dual fuel nozzle proposed for ZL 200510017269.1 all cannot realize CNG/ diesel oil in-cylinder direct-jet technology.Patent publication No. is
The patent of ZL 201310019736.9 proposes a kind of injection apparatus realizing natural gas diesel dual-fuel and method.This patent is at pin
On the basis of the nozzle couple of valve and valve body composition, increase the nozzle that one valve bush part forms, couple each other between three parts,
Achieve the coaxial spraying technique of CNG/Diesel.But the requirement on machining accuracy of this ejector is high, structure is complicated, domestic at present
It is difficulty with.
The dual fuel injection apparatus and method that above-mentioned patent is mentioned, it is impossible to realize diesel oil ignited natural gas in-cylinder direct-jet technology.At present
The core of this technology is all monopolized by overseas enterprise, domestic is still in technological gap.In the face of increasingly serious energy environment crisis,
The application technology of exigence exploitation clean energy resource.Therefore, it is highly desirable to develop that environmental benefit is prominent, power performance is powerful
Diesel oil ignited natural gas in-cylinder direct-jet technology.
Summary of the invention
It is an object of the invention to for the problems referred to above provide a kind of Natural Gas & Diesel Dual Fuel Engine injection mixed characteristic research device and
Control method, the present invention devises a kind of injection combiner being capable of diesel gas dual fuel injection, and is installed on
Constant volume bullet top, and be connected with a set of natural gas supply system and diesel feed system, by a set of ECU control system,
Realize dual-fuel injection mixing, recycle laser Induced Fluorescence Technology, capture spray discharge pattern image clearly, simultaneously at pipeline
Middle installation heater, temperature and pressure transmitter, electromagnetic flowmeter, to study the impact on spraying mixed characteristic of the state of fuel.
The technical scheme is that a kind of Natural Gas & Diesel Dual Fuel Engine injection mixed characteristic research device, including injection combiner
, constant volume bullet, natural gas injector, diesel injector, air supply system, oil supply system, computer I, ECU, laser instrument, with
Step device, camera I, camera II, reflecting mirror and spectroscope；
Described injection combiner is detachably arranged in the top of constant volume bullet, is provided with and constant volume bullet test section in described injection combiner
Installing hole I that territory communicates and installing hole II；Described natural gas injector is fixedly mounted on installing hole I, described diesel injector
It is fixedly mounted on installing hole II；
Described air supply system is connected with the import of natural gas injector；The import phase of described oil supply system and described diesel injector
Connect；
Described reflecting mirror is positioned at the side window of constant volume bullet, and spectroscope is positioned at the front window of constant volume bullet；Described camera I and camera
II faces spectroscopical two minute surfaces respectively；Described computer I electrically connects with the input of lock unit, the outfan of lock unit
Electrically connect with laser instrument, camera I and camera II respectively；
Described ECU includes transceiver module, natural gas injector control module and diesel injector control module；Described transceiver module
Electrically connect with computer I, the signal received from computer I is sent to natural gas injector control module and diesel injector control
Molding block, described natural gas injector control module electrically connects, is used for controlling the switch of natural gas injector with natural gas injector,
Described diesel injector control module electrically connects, is used for controlling the switch of diesel injector with diesel injector, and transceiver module is being given
While natural gas injector and diesel injector launch signal, also transferring the signal to the computer I, computer I is by same
Step device controls laser instrument transmitting laser and camera I and camera II shoot photo simultaneously.
In such scheme, described air supply system includes natural gas tank and acetone generator；Described acetone generator includes air inlet I
And gas outlet；Described air inlet I is connected with natural gas tank by high pressure flexible metallic conduit；High-pressure air pipe and natural gas are passed through in gas outlet
Ejector connects；
The high-pressure air pipe that described gas outlet is connected with natural gas injector is provided with acetone concentration meter, temperature sensor, pressure sensing
Device I and effusion meter；
The bottom of described acetone generator is placed in water-bath heater.
In such scheme, described oil supply system includes high pressure oil rail, high-pressure oil pump, fuel tank and computer II；Described hydraulic oil
One end of pump is connected with fuel tank, and the other end is connected with one end of high pressure oil rail, and the other end of high pressure oil rail passes through high-pressure oil pipe and bavin
Oil ejector connects；Pressure transducer II is installed on described high pressure oil rail；The hydraulic oil that high pressure oil rail is connected with diesel injector
Pressure gauge I is installed on pipe；
Described computer II electrically connects with high-pressure oil pump and pressure transducer II respectively, the high pressure detected according to pressure transducer II
Liquid oil pressure signal in oil rail, controls the high-pressure oil pump fuel delivery to high pressure oil rail.
In such scheme, described injection combiner also includes microchannel；One end of described microchannel and the outlet of natural gas injector
Communicating, the other end communicates with constant volume bullet test zone.
Further, one end that described microchannel and constant volume bullet test zone communicate is 5mm with the distance of shaft centers of diesel injector outlet.
Further, the top of described injection combiner includes that ring-shaped step I, the circumference of described ring-shaped step I are provided with screwed hole,
Described injection combiner passes through screwed hole and the top being bolted to constant volume bullet；
The lower section of described ring-shaped step I is additionally provided with ring-shaped step II, and the bottom of ring-shaped step II is provided with graphite gasket.
In such scheme, described injection combiner also includes fixture；Described fixture is " work " font, and the both sides of described fixture set
Having the draw-in groove of opening, described natural gas injector and diesel injector to be stuck on draw-in groove, described fixture is provided with Liang Ge center
Symmetrical through hole, described fixture is additionally provided with two root length bolts, and after two root length bolts pass described through hole, precession is sprayed bottom combiner
Screwed hole and fasten.
A kind of control method according to above-mentioned Natural Gas & Diesel Dual Fuel Engine injection mixed characteristic research device, comprises the following steps:
S1, the described Natural Gas & Diesel Dual Fuel Engine injection mixed characteristic research device installation connection that will test；
S2, camera I, camera II are demarcated, demarcate and constant volume bullet is installed after terminating, and check air-tightness；
S3, unlatching air supply system and oil supply system so that it is reach experiment value；
S4, by ECU regulation CNG/Diesel injection strategy, in the wink that natural gas injector and diesel injector are started working
Between, ejection pulse signal is transmitted to computer I, computer I controls laser instrument, camera I and camera respectively by lock unit
II starts simultaneously at work；
S5, image according to shooting, the concentration of regulation gas, and camera gain, the image optimal to obtain quality；
S6, acquisition spraying image, after carrying out image procossing with MATLAB software, then carry out the mixed characteristic of double fuel jet
Research and analyse.
In such scheme, described step S3, particularly as follows: open air supply system, opens natural gas tank, and natural gas passes through high-pressure metal
Flexible pipe enters under the acetone liquid level of acetone generator, and natural gas and acetone flow out through gas conduit after being sufficiently mixed, and approach acetone is dense
Degree meter, temperature sensor, pressure transducer I and effusion meter, arrive at natural gas injector, regulate water-bath heater temperature, third
The addition of ketone liquid and supply gas pressure, obtain the natural gas/acetone steam gaseous mixture meeting experimental concentration requirement；
Open oil supply system, the liquid oil pressure signal in the high pressure oil rail that computer II detects according to pressure transducer II, control
The high-pressure oil pump processed fuel delivery to high pressure oil rail, regulation pressure, to experiment value, keeps constant.
In such scheme, described step S4 is particularly as follows: computer I controls ECU regulation natural gas injector and diesel injector
Injection pulse width, injection phase, and injection frequency, in the moment that natural gas injector and diesel injector are started working, will spray
Penetrating pulse signal and be transmitted to computer I, computer I controls laser instrument, camera I and camera II respectively by lock unit and opens simultaneously
Beginning work；The laser that laser instrument is launched injects the pilot region of constant volume bullet by illuminator, and running into diesel spray, to produce Michaelis scattered
Penetrating, when laser runs into natural gas/acetone jet, acetone can be excited and be sent fluorescence, and its fluorescence intensity just becomes with acetone concentration
Ratio, this two bundles different light of wavelength is when constant volume bullet front window sends by spectroscope, by separately respectively by camera I and camera
II receives.
The invention has the beneficial effects as follows:
1, the present invention achieves dual-fuel injection mixed strategy by dual fuel injection combiner, for natural gas in-cylinder direct-jet diesel oil
The exploitation of ignition engines provides experimental data.
2, the present invention is by a kind of acetone generator of design, and can control acetone by the metering of temperature and addition acetone
Concentration, and accurately measure acetone concentration by acetone concentration meter.
3, the present invention uses dual fuel injection combiner, and devises a set of double fuel control ECU system so that it is can control respectively
Preparing natural gas ejector and diesel injector, the stability of whole system, reliability are greatly improved；It is possible not only to carry out double fuel
Relevant experimentation, will also apply to the jet mixing combustion experiment research of diesel oil list fuel and gas as single fuel.
4, the dual fuel injection combiner of present invention design, natural gas spray fan led with diesel oil spray fan by microchannel together with, its
Distance of shaft centers is 5mm, it is possible to the dual fuel injection situation in simulated engine.
Accompanying drawing explanation
Fig. 1 is the structural representation of an embodiment of the present invention；
Fig. 2 is that an embodiment of the present invention sprays combiner tomograph；
Fig. 3 is that an embodiment of the present invention sprays combiner three-dimensional cross-sectional figure；
Fig. 4 is that an embodiment of the present invention sprays combiner two-dimensional section figure；
Fig. 5 is an embodiment of the present invention clamp structure schematic diagram；
Fig. 6 is an embodiment of the present invention acetone generator architecture figure；
Fig. 7 implements the flow chart of the Natural Gas & Diesel Dual Fuel Engine injection mixed characteristic research method provided for an embodiment of the present invention.
In figure: 1, injection combiner；2, constant volume bullet；3, spectroscope；4, camera I；5, camera II；6, laser instrument；7、
Lock unit；8, computer I；9, computer II；10, high pressure oil rail；11、ECU；12, Pressure gauge I；13, pressure
Table II；14, high-pressure oil pipe；15, reflecting mirror；16, effusion meter；17, pressure transducer I；18, temperature sensor；19、
Acetone concentration meter；20, high-pressure air pipe；21, nitrogen cylinder；22, acetone generator；23, natural gas tank；24, pressure sensing
Device II；26, natural gas injector；27, diesel injector；28, fixture；29, draw-in groove；30, through hole；31, installing hole
Ⅰ；32, installing hole II；33, microchannel；34, ring-shaped step I；35, screwed hole；36, ring-shaped step II；37, enter
QI KOU I；38, air inlet II；39, gas outlet；40, standby installing port 41, unload liquid mouth；42, support；43, water-bath adds
Hot device.
Detailed description of the invention
The present invention is described in further detail by detailed description of the invention below in conjunction with the accompanying drawings, but protection scope of the present invention is not limited to
This.
Fig. 1 is a kind of embodiment of Natural Gas & Diesel Dual Fuel Engine of the present invention injection mixed characteristic research device, described natural
Gas/diesel dual-fuel injection mixed characteristic research device, including injection combiner 1, constant volume bullet 2, natural gas injector 26, bavin
Oil ejector 27, air supply system, oil supply system, computer I 8, ECU11, laser instrument 6, lock unit 7, camera I 4,
Camera II 5, reflecting mirror 15 and spectroscope 3.
Described injection combiner 1 is detachably arranged in the top of constant volume bullet 2, is sealed by bolt presses；Described injection combination
The installing hole I 31 and installing hole II 32 communicated with constant volume bullet 2 test zone it is provided with in device 1；Described natural gas injector 26 is solid
Dingan County is contained on installing hole I 31, and described diesel injector 27 is fixedly mounted on installing hole II 32, constitutes dual fuel injection group
Clutch, as shown in Figures 2 and 3.
Described air supply system is connected with the import of natural gas injector 26；Described oil supply system and described diesel injector 27
Import is connected.
Described reflecting mirror 15 is positioned at the side window of constant volume bullet 2, and spectroscope 3 is positioned at the front window of constant volume bullet 2；Described camera
I 4 and camera II 5 face two minute surfaces of spectroscope 3 respectively；Described computer I 8 electrically connects with the input of lock unit 7,
The outfan of lock unit 7 electrically connects with laser instrument 6, camera I 4 and camera II 5 respectively.Camera I 4 and camera II 5 are ICCD
Camera.
Described ECU11 includes transceiver module, natural gas injector control module and diesel injector control module；Described transmitting-receiving mould
Block electrically connects with computer I 8, the signal received from computer I 8 is sent to natural gas injector control module and diesel injection
Device control module, described natural gas injector control module electrically connects with natural gas injector 26, for controlling natural gas injector
The switch of 26, described diesel injector control module electrically connects with diesel injector 27, for controlling opening of diesel injector 27
Closing, transceiver module, while launching signal to natural gas injector 26 and diesel injector 27, also transfers the signal to the meter
Calculation machine I 8, computer I 8 controls that laser launched by laser instrument 6 by lock unit 7 and camera 4 I and camera 5 II shoot photograph simultaneously
Sheet.
Described air supply system includes natural gas tank 23 and acetone generator 22；As shown in Figure 6, described acetone generator 22 includes
Air inlet I 37, air inlet II 38, gas outlet 39, installing port 40 and unload liquid mouth 41；Described air inlet I 37 is by high pressure gold
Belong to flexible pipe to be connected with natural gas tank 23；Gas outlet 39 is connected with natural gas injector 26 by high-pressure air pipe 20；Described give vent to anger
The high-pressure air pipes 20 that mouth 39 is connected with natural gas injector 26 are provided with acetone concentration meter 19, temperature sensor 18, pressure biography
Sensor I 17 and effusion meter 16, can measure the state of working medium；The bottom of described acetone generator 22 is placed in water-bath by support 42
In heater 43.Described air inlet II 38 is standby air inlet, and in this experiment, described air inlet II 38 seals with end socket.
Described installing port 40 is positioned at the top of acetone generator 22, for standby temperature and pressure transmitter installing port；Described unload liquid mouth 41
It is positioned at the bottom of acetone generator 22, acetone can be discharged by unloading liquid mouth 41.
Described oil supply system includes high pressure oil rail 10, high-pressure oil pump, fuel tank and computer II 9；One end of described high-pressure oil pump
Being connected with fuel tank, the other end is connected with one end of high pressure oil rail 10, and the other end of high pressure oil rail 10 passes through high-pressure oil pipe and diesel oil
Ejector 27 connects；On described high pressure oil rail 10, pressure transducer II 24 is installed；High pressure oil rail 10 and diesel injector 27
On the high-pressure oil pipe connected, Pressure gauge I 12 is installed；Described computer II 9 is electric with high-pressure oil pump and pressure transducer II 24 respectively
Connect, according to the liquid oil pressure signal in the high pressure oil rail 10 that pressure transducer II 24 detects, control high-pressure oil pump to height
The fuel delivery of force feed rail 10.
As shown in Figure 4, described injection combiner 1 also includes microchannel 33；One end of described microchannel 33 and natural gas injection
The outlet of device 26 communicates, and the other end communicates with constant volume bullet 2 test zone.In process of the test, diesel oil passes through diesel injector
27 are directly injected in constant volume bullet 2, and natural gas is then sprayed in microchannel 33 enters constant volume bullet 2 by natural gas injector 26.
One end that described microchannel 33 and constant volume bullet 2 test zone communicate is 5mm with the distance of shaft centers of diesel injector 27 outlet, it is possible to
Dual fuel injection situation in simulated engine.
The top of described injection combiner 1 includes that ring-shaped step I 34, the circumference of described ring-shaped step I 34 are provided with screwed hole 35,
Described injection combiner 1 is by screwed hole 35 and the top being bolted to constant volume bullet 2.
The lower section of described ring-shaped step I 34 is additionally provided with ring-shaped step II 35, and the bottom of ring-shaped step II 35 is provided with graphite gasket.Whole
Individual injection combiner 1 is bolted at constant volume bullet 2 top, and is sealed by graphite gasket.
Described injection combiner 1 also includes fixture 28；Described fixture is " work " font, as shown in Figure 5；Described fixture 28
Both sides be provided with the draw-in groove 29 of opening, described natural gas injector 26 and diesel injector 27 are stuck on draw-in groove 29, institute
Stating fixture 28 and be provided with two centrosymmetric through holes 30, described fixture 28 is additionally provided with two root length bolts, and two root length bolts pass
After described through hole 30, precession is sprayed the screwed hole bottom combiner 1 and fastens.
Also needing to use nitrogen cylinder 21 in process of the test, nitrogen cylinder 21 is connected with constant volume bullet 2 by high-pressure air pipe, described nitrogen
On the high-pressure air pipe that gas cylinder 21 is connected with constant volume bullet 2, Pressure gauge II 13 is installed.Nitrogen cylinder 21 provides back pressure for constant volume bullet 2.
Present invention also offers the method for testing of a kind of Natural Gas & Diesel Dual Fuel Engine injection mixed characteristic research, by natural gas injector
26 and diesel injector 27 be respectively arranged in injection combiner 1 compressing, it is fixed to be then arranged on by dual fuel injection combiner 1
Hold bullet 2 top and compress sealing.Connect corresponding pipeline, instrument and circuit as shown in Figure 1.Need I 4 before experiment, camera II
5 demarcate, and are placed in by target below the nozzle of injection combiner 1, regulate camera focus, until target is high-visible.
Before experiment, need first acetone concentration to be demarcated with its fluorescence intensity, method particularly includes: the acetone of variable concentrations is at laser
Irradiation under the fluorescence intensity that sends different, the color of image of ICCD camera capture is also by difference, so the first step, can essence
Really control acetone concentration, by controlling the amount of pressure, temperature and acetone soln in acetone generator 22, use acetone concentration simultaneously
Meter 19 monitors, in real time to reach the acetone concentration accurately controlling in natural gas.Second step, by the natural gas/acetone of variable concentrations
Gaseous mixture imports mix homogeneously in special glass container, and from side-irradiation laser, ICCD phase machine face shoots, and controls to swash simultaneously
Light energy intensity, camera position, focal length, gain are identical with experiment value.3rd step, because after the acetone of variable concentrations is stimulated
The fluorescence intensity sent is different, so demarcating acetone concentration according to this characteristic, making and corresponding fluorescence pattern.
After early-stage preparations terminate, experiment can be carried out.It is illustrated in figure 7 this experiment flow figure, controls ECU11 by computer I 8
Assign open command to ejector, while ejector work, also pulse signal is simultaneously transferred to laser instrument 6 by lock unit 7
With ICCD camera.By changing the time delay of camera, capture descends spray discharge pattern, the most in the same time to carry out double fuel jet mixing characteristic
Research.
The control method of described Natural Gas & Diesel Dual Fuel Engine injection mixed characteristic research device, specifically includes following steps:
S1, the described Natural Gas & Diesel Dual Fuel Engine injection mixed characteristic research device installation connection that will test；
S2, camera I 4, camera II 5 are demarcated, demarcate and constant volume bullet 2 is installed after terminating, and check air-tightness；
S3, unlatching air supply system and oil supply system so that it is reach experiment value；
S4, the injection strategy regulating CNG/Diesel by ECU11, open at natural gas injector 26 and diesel injector 27
The moment of beginning work, ejection pulse signal being transmitted to computer I 8, computer I 8 controls laser instrument respectively by lock unit 7
6, camera I 4 and camera II 5 start simultaneously at work；
S5, image according to shooting, the concentration of regulation gas, and camera gain, the image optimal to obtain quality；
S6, acquisition spraying image, after carrying out image procossing with MATLAB software, then carry out the mixed characteristic of double fuel jet
Research and analyse.
Described step S3, particularly as follows: open air supply system, opens natural gas tank 23, and natural gas is entered by high pressure flexible metallic conduit
Under the acetone liquid level of acetone generator 22, natural gas and acetone flow out through gas conduit after being sufficiently mixed, approach acetone concentration meter
19, temperature sensor 18, pressure transducer I 17 and effusion meter 16, arrive at natural gas injector 26, regulates water-bath heater
43 temperature, the addition of acetone liquid and supply gas pressure, obtain the natural gas/acetone steam gaseous mixture meeting experimental concentration requirement；
Open oil supply system, the liquid oil pressure signal in the high pressure oil rail 10 that computer II 9 detects according to pressure transducer II 24,
Controlling the high-pressure oil pump fuel delivery to high pressure oil rail 10, regulation pressure, to experiment value, keeps constant.
Described step S4 regulates natural gas injector particularly as follows: computer I 8 controls ECU11 by software ECUMonitor
26 and the injection pulse width of diesel injector 27, injection phase, and injection frequency, in natural gas injector 26 and diesel injection
The moment that device 27 is started working, ejection pulse signal being transmitted to computer I 8, computer I 8 is controlled respectively by lock unit 7
Laser instrument 6 processed, camera I 4 and camera II 5 start simultaneously at work；It is fixed that the laser that laser instrument 6 is launched is injected by illuminator 15
Holding the pilot region of bullet 2, run into diesel spray and can produce Mie scattering, when laser runs into natural gas/acetone jet, acetone can be subject to
Sending fluorescence to exciting, its fluorescence intensity is directly proportional to acetone concentration, and the different light of this two bundles wavelength is through constant volume bullet 2 front window
When mouth sends by spectroscope 3, received by camera I 4 and camera II 5 the most respectively.
The present invention devises a kind of injection combiner 1 being capable of diesel gas dual fuel injection, and is installed on constant volume
Bullet 2 top, and be connected with a set of natural gas supply system and diesel feed system, by ECU control system, it is achieved double
The injection mixing of fuel, recycles laser Induced Fluorescence Technology, by a set of optical signalling system to spraying image, simultaneously at pipe
Road is installed heater, temperature sensor, pressure transducer, electromagnetic flowmeter, to study the state of fuel to spraying mixing
The impact of characteristic.
Described embodiment be the present invention preferred embodiment, but the present invention is not limited to above-mentioned embodiment, without departing substantially from this
In the case of the flesh and blood of invention, any conspicuously improved, replacement or modification that those skilled in the art can make are equal
Belong to protection scope of the present invention.
Claims (10)
1. Natural Gas & Diesel Dual Fuel Engine injection mixed characteristic research device, it is characterised in that include spraying combiner (1),
Constant volume bullet (2), natural gas injector (26), diesel injector (27), air supply system, oil supply system, computer I (8),
ECU (11), laser instrument (6), lock unit (7), camera I (4), camera II (5), reflecting mirror (15) and spectroscope (3)；
Described injection combiner (1) is detachably arranged in the top of constant volume bullet (2), is provided with in described injection combiner (1)
The installing hole I (31) communicated with constant volume bullet (2) test zone and installing hole II (32)；Described natural gas injector (26)
Being fixedly mounted on installing hole I (31), described diesel injector (27) is fixedly mounted on installing hole II (32)；
Described air supply system is connected with the import of natural gas injector (26)；Described oil supply system and described diesel injector (27)
Import be connected；
Described reflecting mirror (15) is positioned at the side window of constant volume bullet (2), and spectroscope (3) is positioned at the front window of constant volume bullet (2)
Mouthful；Described camera I (4) and camera II (5) face two minute surfaces of spectroscope (3) respectively；Described computer I (8)
Electrically connect with the input of lock unit (7), the outfan of lock unit (7) respectively with laser instrument (6), camera I (4) and phase
Machine II (5) electrically connects；
Described ECU (11) includes transceiver module, natural gas injector control module and diesel injector control module；Described receipts
Send out module to electrically connect with computer I (8), the signal received from computer I (8) is sent to natural gas injector control mould
Block and diesel injector control module, described natural gas injector control module electrically connects with natural gas injector (26), is used for
Controlling the switch of natural gas injector (26), described diesel injector control module electrically connects with diesel injector (27), uses
In the switch of control diesel injector (27), transceiver module is being sent out to natural gas injector (26) and diesel injector (27)
While penetrating signal, also transferring the signal to the computer I (8), computer I (8) controls laser by lock unit (7)
Laser launched by device (6) and camera (4) I and camera (5) II shoot photo simultaneously.
Natural Gas & Diesel Dual Fuel Engine injection mixed characteristic research device the most according to claim 1, it is characterised in that described
Air supply system includes natural gas tank (23) and acetone generator (22)；
Described acetone generator (22) includes air inlet I (37) and gas outlet (39)；Described air inlet I (37) is by height
Pressure metal hose is connected with natural gas tank (23)；Gas outlet (39) is by high-pressure air pipe (20) and natural gas injector (26)
Connect；
The high-pressure air pipe (20) that described gas outlet (39) is connected with natural gas injector (26) be provided with acetone concentration meter (19),
Temperature sensor (18), pressure transducer I (17) and effusion meter (16)；
The bottom of described acetone generator (22) is placed in water-bath heater (43).
Natural Gas & Diesel Dual Fuel Engine injection mixed characteristic research device the most according to claim 1, it is characterised in that described
Oil supply system includes high pressure oil rail (10), high-pressure oil pump, fuel tank and computer II (9)；
One end of described high-pressure oil pump is connected with fuel tank, and the other end is connected with the one end of high pressure oil rail (10), high pressure oil rail (10)
The other end be connected with diesel injector (27) by high-pressure oil pipe；Described high pressure oil rail is provided with pressure transducer on (10)
Ⅱ(24)；On the high-pressure oil pipe that high pressure oil rail (10) is connected with diesel injector (27), Pressure gauge I (12) is installed；
Described computer II (9) electrically connects with high-pressure oil pump and pressure transducer II (24) respectively, according to pressure transducer II (24)
Liquid oil pressure signal in the high pressure oil rail (10) detected, controls the high-pressure oil pump fuel delivery to high pressure oil rail (10).
Natural Gas & Diesel Dual Fuel Engine injection mixed characteristic research device the most according to claim 1, it is characterised in that described
Injection combiner (1) also includes microchannel (33)；One end of described microchannel (33) goes out with natural gas injector (26)
Mouth communicates, and the other end communicates with constant volume bullet (2) test zone.
Natural Gas & Diesel Dual Fuel Engine injection mixed characteristic research device the most according to claim 4, it is characterised in that described
The distance of shaft centers that one end that microchannel (33) and constant volume bullet (2) test zone communicate and diesel injector (27) export is 5mm.
Natural Gas & Diesel Dual Fuel Engine injection mixed characteristic research device the most according to claim 4, it is characterised in that described
The top of injection combiner (1) includes that ring-shaped step I (34), the circumference of described ring-shaped step I (34) are provided with screwed hole (35),
Described injection combiner (1) passes through screwed hole (35) and the top being bolted to constant volume bullet (2)；
The lower section of described ring-shaped step I (34) is additionally provided with ring-shaped step II (35), and the bottom of ring-shaped step II (35) is provided with stone
Tampon circle.
Natural Gas & Diesel Dual Fuel Engine injection mixed characteristic research device the most according to claim 4, it is characterised in that described
Injection combiner (1) also includes fixture (28)；Described fixture is " work " font, and the both sides of described fixture (28) are provided with out
The draw-in groove (29) of mouth, described natural gas injector (26) and diesel injector (27) are stuck on draw-in groove (29), described
Fixture (28) is provided with two centrosymmetric through holes (30), and described fixture (28) is additionally provided with two root length bolts, two root length spiral shells
Bolt is through the screwed hole bottom described through hole (30) precession afterwards injection combiner (1) and fastens.
8. Natural Gas & Diesel Dual Fuel Engine sprays a control method for mixed characteristic research device according to claim 1, its
It is characterised by, comprises the following steps:
S1, the described Natural Gas & Diesel Dual Fuel Engine injection mixed characteristic research device installation connection that will test；
S2, camera I (4), camera II (5) are demarcated, demarcate and constant volume bullet (2) is installed after terminating, and check air-tightness；
S3, unlatching air supply system and oil supply system so that it is reach experiment value；
S4, by ECU (11) regulation CNG/Diesel injection strategy, in natural gas injector (26) and diesel injection
The moment that device (27) is started working, ejection pulse signal being transmitted to computer I (8), computer I (8) passes through lock unit
(7) control laser instrument (6), camera I (4) and camera II (5) respectively and start simultaneously at work；
S5, image according to shooting, the concentration of regulation gas, and camera gain, the image optimal to obtain quality；
S6, acquisition spraying image, after carrying out image procossing with MATLAB software, then carry out the mixed characteristic of double fuel jet
Research and analyse.
Control method the most according to claim 8, it is characterised in that described step S3 particularly as follows: open air supply system,
Opening natural gas tank (23), natural gas enters under the acetone liquid level of acetone generator (22) by high pressure flexible metallic conduit, natural gas
Flow out through gas conduit after being sufficiently mixed with acetone, approach acetone concentration meter (19), temperature sensor (18), pressure transducer
I (17) and effusion meter (16), arrive at natural gas injector (26), regulate water-bath heater (43) temperature, acetone liquid
Addition and supply gas pressure, obtain and meet the natural gas/acetone steam gaseous mixture of experimental concentration requirement；
Open oil supply system, the liquid in the high pressure oil rail (10) that computer II (9) detects according to pressure transducer II (24)
Oil pressure signal, controls the high-pressure oil pump fuel delivery to high pressure oil rail (10), and regulation pressure, to experiment value, keeps constant.
Control method the most according to claim 8, it is characterised in that described step S4 is particularly as follows: computer I (8)
Control ECU (11) regulation natural gas injector (26) and the injection pulse width of diesel injector (27), injection phase, and
Injection frequency, in the moment that natural gas injector (26) and diesel injector (27) are started working, sends out ejection pulse signal
Penetrating to computer I (8), computer I (8) controls laser instrument (6), camera I (4) and phase respectively by lock unit (7)
Machine II (5) starts simultaneously at work；The laser that laser instrument (6) is launched injects the test of constant volume bullet (2) by illuminator (15)
Region, runs into diesel spray and can produce Mie scattering, and when laser runs into natural gas/acetone jet, acetone can be excited and send
Fluorescence, its fluorescence intensity is directly proportional to acetone concentration, and this two bundles different light of wavelength sends through constant volume bullet (2) front window and passes through
During spectroscope (3), received by camera I (4) and camera II (5) the most respectively.
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| CN106194538A (en) * | 2016-08-17 | 2016-12-07 | 江苏大学 | A kind of back pressure that can regulate realizes the assay device of fuel injector Visualization |
| CN106593718A (en) * | 2016-11-14 | 2017-04-26 | 江苏大学 | Dual-fuel jet research device combining schlieren technology and PIV technology and method thereof |
| CN107605634A (en) * | 2017-08-15 | 2018-01-19 | 江苏大学 | A kind of diesel/natural gas dual-fuel directly spray device |
| CN110220878A (en) * | 2019-06-27 | 2019-09-10 | 中国科学院力学研究所 | A kind of measurement method and system of liquid fuel primary fragmentation |
| CN111058985A (en) * | 2020-01-16 | 2020-04-24 | 无锡威孚高科技集团股份有限公司 | Measuring device for a dual fuel injector |
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| CN106194538A (en) * | 2016-08-17 | 2016-12-07 | 江苏大学 | A kind of back pressure that can regulate realizes the assay device of fuel injector Visualization |
| CN106593718A (en) * | 2016-11-14 | 2017-04-26 | 江苏大学 | Dual-fuel jet research device combining schlieren technology and PIV technology and method thereof |
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| CN111434916A (en) * | 2019-01-14 | 2020-07-21 | 中国船舶重工集团公司第七一一研究所 | Simplified testing device suitable for mechanical oil sprayer capacity bullet spraying test |
| CN110220878A (en) * | 2019-06-27 | 2019-09-10 | 中国科学院力学研究所 | A kind of measurement method and system of liquid fuel primary fragmentation |
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| CN111648896A (en) * | 2020-06-08 | 2020-09-11 | 一汽解放汽车有限公司 | Flow test system of integrated oil-gas control dual-fuel direct injection injector |
| CN111648896B (en) * | 2020-06-08 | 2021-07-16 | 一汽解放汽车有限公司 | Flow test system of integrated oil-gas control dual-fuel direct injection injector |
| CN112943500A (en) * | 2021-03-11 | 2021-06-11 | 西华大学 | Device and method for simulating influence of plateau environment on spraying characteristic of aviation piston engine |
| CN113340602A (en) * | 2021-07-06 | 2021-09-03 | 天津大学 | Visual variable capacitance bomb device and method capable of realizing multi-directional observation |
| CN113267456A (en) * | 2021-07-20 | 2021-08-17 | 中国人民解放军国防科技大学 | Spray field local mixing ratio measuring method based on image processing |
| CN113267456B (en) * | 2021-07-20 | 2021-09-17 | 中国人民解放军国防科技大学 | Spray field local mixing ratio measuring method based on image processing |
| CN113586301A (en) * | 2021-07-27 | 2021-11-02 | 北京工业大学 | Dual-fuel injection device and method capable of adjusting angle and relative position |
| CN114993686A (en) * | 2022-05-30 | 2022-09-02 | 武汉理工大学 | Dual-fuel experimental system based on constant-volume combustion bomb |
| CN116220983A (en) * | 2023-03-20 | 2023-06-06 | 一汽解放汽车有限公司 | Injector testing system and testing method |
| CN116220983B (en) * | 2023-03-20 | 2024-06-04 | 一汽解放汽车有限公司 | Injector testing system and testing method |
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