CN109164204A - A kind of multi-functional CONSTANT VOLUME MODEL COMBUSTION CHAMBER of multi-point spark - Google Patents
A kind of multi-functional CONSTANT VOLUME MODEL COMBUSTION CHAMBER of multi-point spark Download PDFInfo
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- CN109164204A CN109164204A CN201811115936.3A CN201811115936A CN109164204A CN 109164204 A CN109164204 A CN 109164204A CN 201811115936 A CN201811115936 A CN 201811115936A CN 109164204 A CN109164204 A CN 109164204A
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- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/12—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using combustion
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Abstract
The invention discloses it is a kind of can multi-point spark multi-functional CONSTANT VOLUME MODEL COMBUSTION CHAMBER, constant volume bullet main body including Horizontal tubular, the radial top intermediate coaxial of constant volume bullet main body is equipped with cylindrical boss and sleeve mounting hole, and axial ends is respectively equipped with observation window, a set of igniting electric-control system is separately arranged；Be also laid with 7 spark-plug holes on the same sagittal plane of sleeve mounting hole, have several accessory mounting holes on the shaft section of body；The observation window construction at both ends is identical, and observation window includes sequentially connected ring flange, glass base, quartz glass and gland, and ring flange is connected through a screw thread constant volume bullet main body；Its advantage mainly has: can carry out the various experimental studies such as being sprayed, premix laminar combustion and multi-point spark；And in multi-point spark, ignition count, energy and position, and control igniting sequential can be changed；Two sets of observation windows of optimization design, can switch according to experiment content, reach optimal observing effect, and be easy to integral disassembly, assembly, convenient for cleaning.
Description
Technical field
The present invention relates to dynamic power machine field of combustion technology, in particular to one kind can carry out premix laminar combustion, fuel spray
The CONSTANT VOLUME MODEL COMBUSTION CHAMBER of the multiple types experimental study such as mist characteristic and multi-point spark.
Background technique
Instantly in order to make engine energy-saving emission reduction, the thermal efficiency is improved, internal combustion engine researchers are improving engine cylinder internal combustion
Burning process and reinforce having done many researchs to fuel combustion mechanism understanding etc., wherein obtaining the spray characteristics of fuel and its pre-
Mixed laminar combustion data are a very important basic research.The experimental study of this part is usually to test in visual Simulation
It is carried out on device.Constant volume combustion bomb is exactly a kind of good engine combustion research simulator, and it is different just to be generally used for research
Beginning condition (environment and temperature) and different combustion atmospheres (inert gas dilution, oxygen-enriched and lean-burn) are to the shadow of fuel combustion process
It rings.
The premix laminar combustion or injected fuel spray characteristic that traditional constant volume combustion bomb is mainly used under single-point igniting are ground
Study carefully, be generally only suitable for carrying out the research of one of type, moreover, traditional constant volume combustion bomb can seldom carry out multi-point spark
Experimental study.
In addition, traditional especially cylindric constant volume combustion bomb, although in the leakproofness and experiment of optical observation window
The design of enough optimization is done in terms of safety, but often because in the inner cavity of cleaning constant volume combustion bomb and the inside of glass mirror
When need to dismantle window member respectively, for example first remove outmost flange gland, then further remove by inner glass view
Mirror and glass mounting base.This way separately dismounted be easy to cause the damage of glass mirror after multi-pass operation, can also allow light
The leakproofness for learning watch window is deteriorated, and is unfavorable for going on smoothly for experiment.
Summary of the invention
Spraying, premix a plurality of types of experimental studies such as laminar combustion or multi-point spark are concentrated on into a kind of reality in order to realize
Carried out on experiment device, the present invention provide it is a kind of can multi-point spark multi-functional CONSTANT VOLUME MODEL COMBUSTION CHAMBER.
A kind of multi-functional CONSTANT VOLUME MODEL COMBUSTION CHAMBER of multi-point spark includes the constant volume bullet main body 1 of Horizontal tubular, the constant volume bullet
Sleeve mounting hole 2.1 is equipped among the radial top of main body 1, axial ends is respectively equipped with observation window, and improvement is:
Constant volume bullet main body 1 corresponding with sleeve mounting hole 2.1 is equipped with cylindrical boss 2.2, the cylindrical boss 2.2 and set
Cylinder mounting hole 2.1 coaxially penetrates through；
In addition to sleeve mounting hole 2.1, constant volume bullet main body 1 is radially also laid with 7 spark-plug holes 2, the sleeve installation
The hole axle in hole 2.1 and the hole axle of 7 spark-plug holes 2 are in the same sagittal plane；
The top of constant volume bullet main body 1 is equipped with safety valve by safety valve mounting hole 3.5；One fire of 1 one side of constant volume bullet main body
The two sides of flower consent 2 offer air inlet pipe mounting hole 3.1 and exhaust pipe mounting hole 3.2 respectively；Another opposite side of constant volume bullet main body 1
The two sides of one spark-plug hole 2 in face offer temperature sensor fixing hole 3.3 and pressure sensor mounting hole 3.4 respectively；
The observation window construction at both ends is identical, and the observation window includes sequentially connected ring flange 4, glass base and gland, glass
Cooperation is equipped with quartz glass between pedestal and gland；The ring flange 4 is connected through a screw thread constant volume bullet main body 1；
When for injected fuel spray attribute testing, installed on the sleeve mounting hole 2.1 of the cylindrical boss 2.2 by oil injector seat
Other 7 spark-plug holes 2 are sealed and are closed by fuel injector；Mounting temperature sensor at temperature sensor fixing hole 3.3, pressure pass
Pressure sensor is installed at sensor mounting hole 3.4, air inlet pipeline is installed at air inlet pipe mounting hole 3.1, at exhaust pipe mounting hole 3.2
Gas exhaust piping is installed, to realize 1 internal temperature of intake and exhaust and constant volume bullet main body, the pressure monitoring function of CONSTANT VOLUME MODEL COMBUSTION CHAMBER；
When for ignition test, the sleeve mounting hole 2.1 of the cylindrical boss 2.2 is used as spark-plug hole, totally 8 sparks
Consent selects ignition count and position according to requirement of experiment, and seals the spark-plug hole closed and wouldn't used, time of ignition,
Igniting sequential and ignition energy are by electric control system controls of lighting a fire accordingly；Temperature sensing is installed at temperature sensor fixing hole 3.3
Device installs pressure sensor at pressure sensor mounting hole 3.4, and air inlet pipeline, exhaust pipe peace are installed at air inlet pipe mounting hole 3.1
It fills and gas exhaust piping is installed at hole 3.2, to realize 1 internal temperature of intake and exhaust and constant volume bullet main body, the pressure of CONSTANT VOLUME MODEL COMBUSTION CHAMBER
Monitoring function.
The technical solution further limited is as follows:
The wall thickness of the cylindrical boss 2.2 is 2cm, is highly 3cm；And the outer diameter of cylindrical boss 2.2 is installed greater than sleeve
The aperture in hole 2.1；The ring flange 4, glass base and gland are coaxially fixedly installed togather, and are mounted on quartz glass compression
Between glass base and gland.
When common premixed combustion development test for single-point igniting, the diameter of the quartz glass 7 is less than constant volume bullet master
The diameter of body 1 is 110mm；The glass base 5 is equipped with double-round hole, and outer ring is through-hole, with the bolt on the ring flange 4
Hole is connected by bolt fastening, and inner ring is bolt hole, is connect with the through-hole on the gland 6 by bolt fastening；The gland 6
Diameter is less than glass base 5.
When common premixed combustion or spray testing development test for multi-point spark, the diameter of the quartz glass 11 is big
It is 180mm in the diameter of constant volume bullet main body 1.The glass base 9 is equipped with the through-hole of individual pen；10 diameter of gland and institute
It is consistent to state 9 diameter of glass base；The gland 10 is equipped with through-hole with through-hole corresponding position in the glass base 9；The flange
4 upper bolt hole of disk is connect with through-hole on the glass base 9 and the gland 10 by bolt fastening.
The glass base is consistent with 4 diameter of ring flange；The glass base outer end face is equipped with interior concave ring groove, is used for
Quartz glass is born, the indent diameter of ring groove matches with the quartz glass diameter；The gland inner face is equipped with protrusion
End cap land, for compressing quartz glass.
The two sides of quartz glass respectively with the glass base and flange gland contact position and the glass base
With the ring flange 4, it is placed with pressure-resistant high-temperature resistant seal ring gasket.
The igniting electric-control system is made of hardware components and software section；Hardware components be controller, 8 groups it is identical can
It programs ignition drive circuit and computer, the controller includes MC9S12DG128BCPV main control chip, every group of ignition drive circuit
Including omnipotent igniter, inductance type high voltage package and resistor plug；Software section includes bottom code and host computer, realizes electricity
The communication of brain and controller.
The programmable ignition drive circuit includes two parts, and first part is by clamp circuit, RC parallel circuit and switch
Circuit composition, realizes the positive and negative separation to step signal of controller, and second part may be programmed Ignition chip and periphery by TN003
Circuit composition realizes different igniting Curve Design requirements.
Advantageous effects of the invention embody in the following areas:
1. apparatus of the present invention collection injected fuel spray characteristic, the premix multiple types such as laminar combustion and multi-point spark experimental study function
In one.By opening up multiple spark-plug holes in constant volume bullet main body, multi-point spark function is realized, difference fire number can be studied
Amount, the influence of ignition energy and ignition location to combustion process；Cylindrical boss is provided on body, it can be by changing thereon
Sealing flange sleeve switching installation spark plug or fuel injector, for example installation fuel injector and connected with corresponding oil-servicing facilities
Afterwards, injected fuel spray characteristic test research can be carried out.The present invention not only studies type diversification, also improves constant volume bullet main body
Utilization rate, while reducing experimental cost.
2. multi-point spark function of the invention realizes the development multi-point spark class experiment on internal combustion engine simulator and grinds
Study carefully, and the position of multi-point spark, ignition count, ignition energy and igniting sequential are adjustable.Multi-point spark can shorten combustion
The time is burnt, greatly improves efficiency of combustion and lean flammability limit, simultaneously, moreover it is possible to influence the transmission path of combustion pressure wave, reduce internal combustion
The probability of machine generation malcombustion.
3. two sets of optical observation windows of optimization design of the present invention, there are two types of form diameters, can be selected according to experiment content
Installation, keeps observing effect more preferable；In addition, compared to traditional especially cylindric constant volume combustion bomb, optical observation window can be with
Integral demounting convenient for cleaning the inside of body inner cavity and quartz glass, and can reduce when repeatedly individually splitting to quartz glass
Damage and CONSTANT VOLUME MODEL COMBUSTION CHAMBER leakproofness adverse effect.
Detailed description of the invention
Fig. 1 is a kind of overall apparatus sectional view of observation window setting of the present invention；
Fig. 2 is the right view of Fig. 1；
Fig. 3 is the A-A cross-sectional view of Fig. 1；
Fig. 4 is the perspective view of constant volume bullet main body in Fig. 1；
Fig. 5 is the cross-sectional view of ring flange in Fig. 1；
Fig. 6 is the cross-sectional view of glass base in Fig. 1；
Fig. 7 is the cross-sectional view of gland in Fig. 1；
Fig. 8 is the overall apparatus sectional view of another observation window of the present invention；
Fig. 9 is the cross-sectional view of glass base in Fig. 8；
Figure 10 is the cross-sectional view of gland in Fig. 8；
Figure 11 is ignition system composition block diagram；
Figure 12 is programmable ignition drive circuit figure；
Figure 13 is the hardware circuit diagram based on Freescale MC9S12DG128BCPV main control chip；
Figure 14 is multi-point spark primary control program flow chart.
Serial number in upper figure: constant volume bullet main body 1, spark-plug hole 2, sleeve mounting hole 2.1, cylindrical boss 2.2, air inlet pipe peace
Fill hole 3.1, exhaust pipe mounting hole 3.2, temperature sensor fixing hole 3.3, pressure sensor mounting hole 3.4, safety valve mounting hole
3.5, ring flange 4, the first glass base 5, the first gland 6, the first quartz glass 7, sealing ring gasket 8, the second glass base 9
(wherein: interior concave ring groove 5.1 or 9.1), the second gland 10 (wherein: end cap land 6.1 or 10.1), the second quartz glass 11.
Specific embodiment
With reference to the accompanying drawing, the present invention is further described by embodiment.
Referring to Fig. 1 and Fig. 2, a kind of multi-functional CONSTANT VOLUME MODEL COMBUSTION CHAMBER of multi-point spark includes the constant volume bullet main body of Horizontal tubular
1, the radial top centre of the constant volume bullet main body 1 is equipped with sleeve mounting hole 2.1, and axial ends is respectively equipped with observation window, improves
It is:
Referring to Fig. 3, constant volume bullet main body 1 corresponding with sleeve mounting hole 2.1 is equipped with cylindrical boss 2.2, described cylindric convex
Platform 2.2 and sleeve mounting hole 2.1 coaxially penetrate through；The wall thickness of cylindrical boss 2.2 is 2cm, is highly 3cm, and cylindrical boss
2.1 outer diameter is greater than the aperture of sleeve mounting hole 2.2.In addition to sleeve mounting hole 2.1, constant volume bullet main body 1 it is radially also uniformly distributed
Equipped with 7 spark-plug holes 2, the hole axle of the sleeve mounting hole 2.2 and the hole axle of 7 spark-plug holes 2 are in the same sagittal plane
It is interior.
Referring to fig. 4, the top of constant volume bullet main body 1 is equipped with safety valve by safety valve mounting hole 3.5；Constant volume bullet main body 1 one
The two sides of one spark-plug hole 2 of side offer air inlet pipe mounting hole 3.1 and exhaust pipe mounting hole 3.2 respectively；Constant volume bullet master
The two sides of one spark-plug hole 2 of another opposite sides of body 1 offer temperature sensor fixing hole 3.3 and pressure sensor respectively
Mounting hole 3.4.
The observation window construction at both ends is identical, and observation window includes sequentially connected ring flange 4, glass base and gland, glass
Cooperation is equipped with quartz glass between pedestal and gland；Ring flange 4 is connected through a screw thread constant volume bullet main body 1.
Embodiment 1
For common premix laminar combustion
Referring to Fig. 1, when the common premixed combustion for single-point igniting is tested, the diameter of the quartz glass 7 is less than constant volume bullet master
The diameter of body 1 is 110mm.CONSTANT VOLUME MODEL COMBUSTION CHAMBER of the invention is when carrying out common premix laminar combustion, with high temperature and pressure item
It based on combustion test under part, is heated by the heating shell (not shown) being separately arranged to device, heating shell and constant volume burning fill
Entire CONSTANT VOLUME MODEL COMBUSTION CHAMBER when carrying out premix laminar flow assays, need to only be placed in heating shell, add by shape and the size matching set
The heating and thermal insulation of CONSTANT VOLUME MODEL COMBUSTION CHAMBER can be realized in hot shell after being powered, 1 inner cavity temperature of constant volume bullet main body can be in 100~400 DEG C
It adjusts.In addition, by the initial pressure of high pressure gas cylinder distribution mode adjustable constant volume bullet inner cavity, initial pressure adjustable range is
1~5bar.The primary condition of high temperature and pressure can make the pressure of combustion process higher, therefore the stone that design diameter is smaller and thicker
English glass the safety of guarantee test and is gone on smoothly as observation visor.
Ignition location repacks at 1 lumen centers of constant volume bullet main body by elongated wire is welded at spark plug positive and negative electrode
Ignitor is provided with external screw thread, matches with the internal screw thread in spark-plug hole 2, so that the positive and negative anodes of ignitor be led to
It crosses threaded connection to be mounted in symmetrical spark-plug hole 2, is preferably mounted in the positive back side symmetrically in a pair of of spark-plug hole, and
The length in constant volume bullet main body 1 is protruded by changing steel wire, and keeps steel wire opposite in parallel, adjustment electrode discharge is in constant volume bullet
1 lumen centers position of main body.The spacer bolt of remaining spark-plug hole corresponding size is sealed simultaneously.
Referring to Fig. 1 and Fig. 3,2.1 internal diameter of sleeve mounting hole is bigger compared with remaining mounting hole, but is no more than in constant volume bullet main body 1
Chamber radius, and the outer surface of cylindrical boss 2.2 is equipped with bolt hole, is bolted and 2.1 internal diameter phase of sleeve mounting hole
Matched sealing flange sleeve can need to open up different types of mounting hole according to different on flange sleeve, install spark plug or
Person's fuel injector.In the premix laminar combustion test for carrying out single-point igniting, flange sleeve is preferably made enclosed type.
Referring back to Fig. 1 and Fig. 4, the accessory mounting hole 3 opened up in constant volume bullet main body 1 is distributed mainly on device as shown in the figure
Front, the back side and top surface, and the both sides of corresponding spark-plug hole 2 are mainly symmetrically distributed in, so that entire constant volume bullet main body 1
On aperture it is more neat.Particularly a kind of band internal thread mounting hole, mounting hole pass through conduit and its to accessory mounting hole 3
The connection of its equipment.Accessory mounting hole 3 shares 5, including air inlet pipe mounting hole 3.1, exhaust pipe mounting hole 3.2, temperature sensing
Device mounting hole 3.3, pressure sensor mounting hole 3.4 and safety valve mounting hole 3.5.Air inlet pipe mounting hole 3.1 and air inlet pipe and phase
The air distribution system connection answered, realizes accurate distribution by voltage divider principle and conveys into inside constant volume bullet main body 1；Exhaust pipe installation
Exhaust system of the hole 3.2 with exhaust pipe and including vacuum pump is connect, and premixed combustion after the test arranges exhaust gas each time
Out, generally first 1 inner cavity exhaust gas of constant volume bullet main body is vented to normal pressure, then is vacuumized by vacuum pump；Temperature sensor fixing hole 3.3
With pressure sensor mounting hole 3.4 corresponding sensor is installed respectively, and connects data collecting card and display instrument, it is aobvious to monitor
Show 1 internal temperature of constant volume bullet main body and pressure；Safety valve is installed on safety valve mounting hole 3.5, when 1 chamber pressure of constant volume bullet main body
Pressure release when higher than a certain limit value ensures the safety of test.Either in traditional or of the invention CONSTANT VOLUME MODEL COMBUSTION CHAMBER,
Accessory mounting hole is all that entire experimental system is indispensable, is that CONSTANT VOLUME MODEL COMBUSTION CHAMBER connects relevant accessory facility to constitute
The important setting of full experiment platform；In multi-functional CONSTANT VOLUME MODEL COMBUSTION CHAMBER of the invention, common premix laminar combustion needs
Carry out partial pressure distribution air inlet, exhaust vacuumize, and test in temperature, pressure real-time monitoring etc..
Referring back to Fig. 1, Fig. 2 and Fig. 5,1 both ends of constant volume bullet main body are provided with groove and which is provided with external screw thread, while in method
Blue 4 inner ring surface of disk is equipped with internal screw thread 4.1, can match connection with the external screw thread on 1 both ends groove of constant volume bullet main body, ring flange 4,
Glass base 5 and gland 6 be then coaxially securedly mounted to together, make the compression of quartz glass 7 be mounted on glass base 5 and gland 6 it
Between.And in watch window shown in Fig. 1,7 diameter of quartz glass is smaller, is no more than 1 intracavity diameter of constant volume bullet main body, is
110mm.Glass base 5 is equipped with inner ring bolt hole and outer ring through hole at this time, and 6 diameter of gland is less than glass base 5, sets thereon
There is individual pen through-hole.Through-hole on gland 6 is bolted connection with the inner ring bolt hole in glass base 5, in glass base 5
Outer ring through hole be bolted connection with the bolt hole on ring flange 4.
Referring back to Fig. 6 and Fig. 7, glass base 5 and gland 6 shown in respectively Fig. 1.5 outer end face of glass base is set
There is interior concave ring groove 5.1, for bearing quartz glass 7, interior 5.1 diameter of concave ring groove matches with 7 diameter of quartz glass；Gland 6 is then
It is the end cap land 6.1 that inner face is equipped with protrusion, for compressing quartz glass 7.Ring flange 4 is threaded in constant volume bullet main body 1
Upper not dismantle generally, after glass base 5, gland 6 and quartz glass 7 are then connected together, general whole and ring flange 4 is carried out
Disassembly separation.Integral demounting was not only convenient for changing, but also convenient for the inside and 1 inner cavity of constant volume bullet main body of cleaning optical observation window；It is whole
Body disassembly also can avoid when quartz glass 7 is without any damage, repeatedly split glass base 5, flange gland 6 and quartz glass 7
The problems such as poorly sealed and glass breakage that may cause.
Referring back to Fig. 1, the two sides of quartz glass 7 and contact position and the glass base 5 of glass base 5 and flange gland 6
With the contact position of annular flange disk 4, it is intended to be placed with pressure-resistant high-temperature resistant seal ring gasket 8 --- Graphite pad.Connected by fastening
Connecting bolt compress gasket can fully ensure that the sealing problem at 1 both ends of constant volume bullet main body, ensure that going on smoothly for experiment.
Embodiment 2
For multi-point spark or injected fuel spray characteristic research
Referring to Fig. 8, Fig. 9 and Figure 10, when common premixed combustion or spray characteristics development test for multi-point spark, the quartz
The diameter of glass 11 is greater than the diameter of constant volume bullet main body 1, is 180mm；The ring flange 4, glass base 9 and gland 10 are coaxially solid
Dingan County is fitted together, and makes quartz glass 11
Compression is mounted between glass base 9 and gland 10.
It is equipped with individual pen through-hole on glass base 9 and gland 10 at this time, and tight by bolt with the bolt hole on ring flange 4
It is solidly connected, 10 diameter of gland and glass base 9 are consistent.The range of observation of this window setting is big, when can observe multi-point spark
Combustion process in constant volume bullet main body 1 near each ignition point, or when studying spray characteristics, convenient for the whole of observation sprayed oil beam
Body structure.Since watch window form shown in Fig. 8 is relatively large in diameter, be not suitable for directly being bolted with constant volume bullet main body 1,
Constant volume bullet main body 1 is connected by ring flange 4.4 diameter of ring flange is greater than 1 diameter of constant volume bullet main body, and with glass base 9 or
The diameter of glass base 5 is consistent.
With continued reference to Fig. 9 and Figure 10, glass base 9 respectively shown in fig. 8 and gland 10.9 outer end of glass base
Face is equipped with interior concave ring groove 9.1, and for bearing quartz glass 11, interior 9.1 diameter of concave ring groove matches with 11 diameter of quartz glass；Pressure
Lid 10 is then the end cap land 10.1 that inner face is equipped with protrusion, for compressing quartz glass 11.Ring flange 4 is threaded in constant volume
It plays and is not dismantled generally in main body 1, after glass base 9, gland 10 and quartz glass 11 are then connected together, general entirety and method
Blue disk 4 carries out disassembly separation, is not only convenient for changing in this way, but also in the inside and constant volume bullet main body 1 convenient for cleaning optical observation window
Chamber.Integral demounting also can avoid when quartz glass 11 is without any damage, because repeatedly splitting glass base 9, gland 10 and quartz
The problems such as poorly sealed and glass breakage that glass 11 may cause.
Referring back to Fig. 1 and Fig. 3, marked spark-plug hole 2 is only one of them in spark-plug hole 2(figure, remaining spark-plug hole is not
Repetition marks) it is 1~8, therefore ignition point quantity can achieve 1~8.2 quantity of spark-plug hole is specifically arranged in the present invention
Eight, and be arranged circumferentially on wall surface at 1 center of constant volume bullet main body, this arrangement can ignore both ends of the surface pressure wave
The influence to flame propagation is reflected, influence of the pressure wave of each ignition location ignition generation to combustion process is paid close attention to.
When carrying out multi-point spark test, an installation is preferably opened up on the flange sleeve on cylindrical boss 2.2
The hole of spark plug, totally 8 spark-plug holes are for selection.The quantity of multi-point spark be 2~8, ignition location can internal chamber wall face,
Center or other different locations.Spark plug can be installed directly into spark-plug hole 2, light a fire at wall surface, can also be by spark plug just
Elongated wire is welded at negative electrode and repacks ignitor into, external screw thread is provided with, with the internal screw thread in spark-plug hole 2
Match, be mounted in symmetrical spark-plug hole 2 so that the positive and negative anodes of ignitor are connected through a screw thread, and can be by changing steel
Silk protrudes into the length in constant volume bullet main body 1, and keeps steel wire opposite in parallel, and adjustment electrode discharge is in 1 inner cavity of constant volume bullet main body
In position, can also lean near wall at 1 center of constant volume bullet main body.Other 7 sparks in addition to sleeve mounting hole 2.1
Consent 2 all matches the obturator for being machined with corresponding size, close after ignition count and ignition location being selected according to test requirements document
The spark-plug hole 2 that wouldn't be used in testing sealing.If such as two-point ignition, first ignition location is in 1 inner cavity of constant volume bullet main body
Center at this time can amputate the cathode of a spark plug, and the steel wire of certain length is welded at anode, spark-plug thread is screwed into
One spark-plug hole 2 guarantees steel wire end just in the lumen at the heart, and twists in another symmetrical spark-plug hole 2 therewith
Tight sealing bolt, bolt tail equally weld certain length steel wire and protrude at 1 center of constant volume bullet main body as ground connection cathode；Second
One spark plug directly can be installed into spark-plug hole 2 near wall by a ignition location, can also be led to by first method
Crossing adjustment steel wire length makes it light a fire at wall surface.The i.e. available spacer bolt of remaining spark-plug hole 2 that wouldn't be used seals up.
When specific progress multi-point spark test, 8 waypoints fire is realized by igniting electric-control system.The igniting initial time on each road,
Ignition energy is independently adjustable, can form the igniting sequential of needs by configuring each spark plug difference time of ignition.It lights a fire automatically controlled system
Composition block diagram of uniting is made of referring to Figure 11 hardware components and software section.Hardware components mainly have controller circuitry, point fireflood
Dynamic circuit and bottom software.Controller uses Freescale MC9S12DG128BCPV main control chip, and hardware circuit diagram is referring to figure
13, the MAX3232ESE chip in left side realizes the connection communication of controller and computer, MC9S12DG128BCPV main control chip in figure
On PA cause for gossip show the pulse signal of controller and ignition drive circuit and transmit；Since this ignition system is fought using inductance type point
And in order to simplify hardware design, ignition drive circuit uses the omnipotent igniter of sky dragon intelligence point mini, inductance type high voltage package and resistance
Formula spark plug, to realize that 8 waypoint fire need 8 groups of identical driving circuits.Software section is made of bottom code and host computer, real
The communication of existing computer and controller.
Ignition drive circuit uses TN003 Ignition chip referring to Figure 12, which is encapsulated using TSSOP20 patch, nothing
External crystal-controlled oscillation is needed, 3.3V, 5.5V operating voltage is supported, can be used for exchanging CDI, direct current CDI and PEI inductance type ignition control.
Realize single boss triggering igniting, double polarizing keys triggering igniting and square wave triggering igniting.Ignition drive circuit mainly has two parts, and first
Portion is made of clamp circuit, RC parallel circuit and switching circuit, the realization positive and negative separation to step signal of controller, and second
Point Ignition chip may be programmed by TN003 and peripheral circuit forms, realizes that different igniting Curve Designs require.
First part: PA receives the pulse signal that controller issues, and the pulse signal is by direct impulse and negative-going pulse group
At the AC compounent of pulse signal is transmitted to Q5 grid via C8, and former pulse signal and the signal for being split into C8 are clamped electricity
The voltage difference of upper and lower circuit is maintained at 3.3V by road clamper, Schottky diode DZ3 and DZ6, prevents pulse signal voltage excessive
Damage rear class metal-oxide-semiconductor.R11, C6 and R16, C9 form two parallel RC circuits, and capacitor C6 and C9 guarantee that pulse step signal can
It is quickly transmitted to Q3 grid and Q5 source electrode respectively, capacitor R11 and R16 can weaken the energy of low-frequency signals, guarantee that metal-oxide-semiconductor can
It completely closes.When pulse signal positive step is come temporarily, Q3 grid is high level, and metal-oxide-semiconductor is connected, and P1 becomes low from former high level
Level, MOS ends after positive step, and P1 level becomes high level from low level.With should negative sense step to come when, Q5 grid
Pole and source voltage difference are more than conducting voltage, and metal-oxide-semiconductor is opened, and P2 becomes low-voltage from high voltage at this time, at the end of negative sense step
P2 becomes high voltage from low-voltage.More than, controller positive step signal is drawn by P1, and negative sense step signal is drawn by P2.
Second part: the ignition signal of TN003 chip reception P1, P2 transmitting, according to TX, the received setting of RX serial ports pin
Ignition curve normal ignition.C19, C20 are used for power filter, and stable voltage signal is provided for VDD, and RST is reset pin, on
VCC is drawn, forbids resetting.The PEI pin inner portions of chip are push-pull output, have stronger driving capability, realize PEI inductance point
Fire is directly connected with external inductors formula high voltage package.
Igniting sequential and energy implementation method are as follows: light a fire for single channel, the pulse signal for generating certain time length can realize drive
In dynamic circuit inductance high voltage package fill can, pulse signal starting point be high voltage package fill can starting point, pulse signal ends point is
High voltage package is filled can end point.Because of electromagnetic induction, the electric current at the end of signal in inductance declines suddenly causes high voltage package both ends to generate
Very high inverse electromotive force, and the spark plug the two poles of the earth being connected with high voltage package are passed to, puncture air ignition.Pulse signal it is effective
Duration (starting point to end point) is the high voltage package charging time, therefore ignition energy and effective time are positively correlated, actual ignition
Moment is the time where pulse signal ends point.
Multi-point spark principle is similar with single-point igniting, and primary control program flow chart is referring to Figure 14.Controller utilizes I/O mouthfuls of controls
System igniting, MC9S12DG128BCPV-PA mouthfuls are one group I/O mouthfuls, totally 8 I/O pins, meet the control of 8 tunnels and require.It is upper first
Machine transmits each spark plug pulse signal initial time and pulse signal effective time (ignition energy) to slave computer, disposable to send out
It send.Format is such as: t1, μ 1, t2, μ 2, t3, μ 3, t4, μ 4, t5, μ 5, t6, μ 6, t7, μ 7, t8, μ 8.Ti, μ i correspond to certain spark plug arteries and veins
Signal initial time and pulse signal effective time are rushed, if not needing certain plug ignition, corresponding i=0 μ is set.At the beginning of controller
Beginningization sets master timer clock frequency 1000Hz, count initial value 0.1 millisecond of count of every mistake, can by count value from adding 1
Judge the real time.Every 1ms that crosses compares count value and 8 ti values, 8 ti+ μ i values, if count=ti corresponding I/O by
Low level jumps to high level, and charging starts, and otherwise keeps low level constant, and corresponding I/O is by high electricity if count=ti+ μ i
Flat to jump value low level, charging terminates, and otherwise keeps high level constant.
When carrying out injected fuel spray attribute testing, be made on flange sleeve with the matched mounting hole of oil injector seat, will spray
Oily device is mounted on oil injector seat, and reasonable design size exposes fuel injector just a little in 1 inner cavity of constant volume bullet main body
In, avoid sprayed oil beam by constant volume bullet wall interaction, fuel injector is connected with corresponding oil-servicing facilities in test, it is contemplated that common rail
The popularity of injection system application, preferably connect with a common-rail injector testing stand, can carry out injected fuel spray characteristic test
Research.The setting of sleeve mounting hole 2.1 improves constant volume bullet so that this CONSTANT VOLUME MODEL COMBUSTION CHAMBER can carry out diversified experimental study
The utilization rate of main body 1, reduces experimental cost.
In multi-point spark or spray testing, accessory mounting hole 3 in embodiment 1 single-point light a fire when the case where it is identical.Into
Tracheae mounting hole 3.1 and air inlet pipe and corresponding air distribution system connect, by voltage divider principle realize accurate distribution and convey into
Inside constant volume bullet main body 1；Exhaust system of the exhaust pipe mounting hole 3.2 with exhaust pipe and including vacuum pump is connect, each
Exhaust gas is discharged after the test, usually first 1 inner cavity exhaust gas of constant volume bullet main body is vented to normal pressure, then true by vacuum pumping
It is empty；Temperature sensor fixing hole 3.3 and pressure sensor mounting hole 3.4 install corresponding sensor respectively, and connect data and adopt
Truck and display instrument, with monitoring display 1 internal temperature of constant volume bullet main body and pressure；Safety valve mounting hole 3.5 then installs safety
Valve, the pressure release when constant volume bullet 1 chamber pressure of main body is excessively high, fully ensures that the safety of test.Therefore, Examples 1 and 2 require
Carry out partial pressure distribution air inlet, exhaust vacuumize, and test in temperature, pressure real-time monitoring etc..
Referring back to Fig. 8, the two sides of quartz glass 11 and contact position and the glass bottom of glass base 9 and flange gland 10
The contact position of seat 9 and annular flange disk 4, is intended to be placed with pressure-resistant high-temperature resistant seal ring gasket 8 --- Graphite pad.Pass through fastening
Bolt is connected, gasket is pressed, can fully ensure that the sealing problem at body both ends, ensure that going on smoothly for experiment.
Although the preferred embodiment of the present invention is described above in conjunction with attached drawing, the invention is not limited to upper
The specific embodiment stated, the above mentioned embodiment is only schematical, is not restrictive, the common skill of this field
Art personnel under the inspiration of the present invention, in the case where not departing from present inventive concept and scope of the claimed protection, may be used also
To make the transformation of many concrete forms, these all belong to the scope of protection of the present invention interior.
Claims (9)
1. a kind of multi-functional CONSTANT VOLUME MODEL COMBUSTION CHAMBER of multi-point spark, the constant volume bullet main body (1) including Horizontal tubular, the constant volume bullet
Sleeve mounting hole (2.1) are equipped among the radial top of main body (1), axial ends is respectively equipped with observation window, it is characterised in that:
Constant volume bullet main body (1) corresponding with sleeve mounting hole (2.1) is equipped with cylindrical boss (2.2), the cylindrical boss
(2.2) it is coaxially penetrated through with sleeve mounting hole (2.1)；
In addition to sleeve mounting hole (2.1), constant volume bullet main body (1) is radially also laid with 7 spark-plug holes (2), the set
The hole axle of cylinder mounting hole (2.1) and the hole axle of 7 spark-plug holes (2) are in the same sagittal plane；
The top of constant volume bullet main body (1) is equipped with safety valve by safety valve mounting hole (3.5)；Constant volume bullet main body (1) one side
The two sides of one spark-plug hole (2) offer air inlet pipe mounting hole (3.1) and exhaust pipe mounting hole (3.2) respectively；Constant volume bullet master
The two sides of one spark-plug hole (2) of body (1) another opposite sides offer temperature sensor fixing hole (3.3) and pressure respectively
Sensor mounting hole (3.4)；
The observation window construction at both ends is identical, and the observation window includes sequentially connected ring flange (4), glass base and gland, glass
Cooperation is equipped with quartz glass between glass pedestal and gland；The ring flange (4) is connected through a screw thread constant volume bullet main body (1)；
When for injected fuel spray attribute testing, pass through oil injector seat on the sleeve mounting hole (2.1) of the cylindrical boss (2.2)
Fuel injector is installed, other 7 spark-plug holes (2) sealings are closed；Mounting temperature sensor at temperature sensor fixing hole (3.3),
Pressure sensor is installed at pressure sensor mounting hole (3.4), air inlet pipeline, exhaust pipe are installed at air inlet pipe mounting hole (3.1)
Gas exhaust piping is installed, to realize the intake and exhaust and the internal temperature of constant volume bullet main body (1) of CONSTANT VOLUME MODEL COMBUSTION CHAMBER at mounting hole (3.2)
Degree, pressure monitoring function；
When for ignition test, the sleeve mounting hole (2.1) of the cylindrical boss (2.2) is used as spark-plug hole, and totally 8
Spark-plug hole selects ignition count and position according to requirement of experiment, and seals the spark-plug hole closed and wouldn't used, when igniting
It carves, igniting sequential and ignition energy are by electric control system controls of lighting a fire accordingly；Temperature is installed at temperature sensor fixing hole (3.3)
Sensor installs pressure sensor at pressure sensor mounting hole (3.4), installs air inlet pipeline at air inlet pipe mounting hole (3.1),
Gas exhaust piping is installed, in the intake and exhaust and constant volume bullet main body 1 to realize CONSTANT VOLUME MODEL COMBUSTION CHAMBER at exhaust pipe mounting hole (3.2)
Portion's temperature, pressure monitoring function.
2. a kind of multi-functional CONSTANT VOLUME MODEL COMBUSTION CHAMBER of multi-point spark according to claim 1, it is characterised in that: the cylinder
The wall thickness of shape boss (2.2) is 2cm, is highly 3cm；And the outer diameter of cylindrical boss (2.2) is greater than sleeve mounting hole (2.1)
Aperture.
3. a kind of multi-functional CONSTANT VOLUME MODEL COMBUSTION CHAMBER of multi-point spark according to claim 1, it is characterised in that: the flange
Disk (4), glass base and gland are coaxially fixedly installed togather, make quartz glass compression be mounted on glass base and gland it
Between.
4. a kind of multi-functional CONSTANT VOLUME MODEL COMBUSTION CHAMBER of multi-point spark according to claim 3, it is characterised in that: be used for single-point
When the common premixed combustion development test of igniting, the diameter of the quartz glass (7) is less than the diameter of constant volume bullet main body (1), is
110mm；The glass base (5) is equipped with double-round hole, and outer ring is through-hole, relies on spiral shell with the bolt hole on the ring flange (4)
Bolt is fastenedly connected, and inner ring is bolt hole, is connect with the through-hole on the gland (6) by bolt fastening；Gland (6) diameter
Less than glass base (5).
5. a kind of multi-functional CONSTANT VOLUME MODEL COMBUSTION CHAMBER of multi-point spark according to claim 3, it is characterised in that: be used for multiple spot
When the common premixed combustion or spray testing development test of igniting, the diameter of the quartz glass (11) is greater than constant volume bullet main body
(1) diameter is 180mm；
The glass base (9) is equipped with the through-hole of individual pen；Gland (10) diameter and the glass base (9) diameter one
It causes；Through-hole corresponding position is equipped with through-hole on the gland (10) and the glass base (9)；Ring flange (4) upper bolt hole
It is connect with through-hole in the glass base (9) and the gland (10) by bolt fastening.
6. a kind of multi-functional CONSTANT VOLUME MODEL COMBUSTION CHAMBER of multi-point spark according to claim 3, it is characterised in that: the glass
Pedestal is consistent with the ring flange (4) diameter；The glass base outer end face is equipped with interior concave ring groove, for bearing quartz glass,
The indent diameter of ring groove matches with the quartz glass diameter；The gland inner face is equipped with the end cap land of protrusion, uses
In compression quartz glass.
7. a kind of multi-functional CONSTANT VOLUME MODEL COMBUSTION CHAMBER of multi-point spark according to claim 6, it is characterised in that: quartz glass
Two sides respectively with the glass base and flange gland contact position and the glass base and the ring flange (4)
Contact position is placed with pressure-resistant high-temperature resistant seal ring gasket.
8. a kind of multi-functional CONSTANT VOLUME MODEL COMBUSTION CHAMBER of multi-point spark according to claim 1, it is characterised in that: the igniting
Electric-control system is made of hardware components and software section；Hardware components are controller, 8 groups of identical programmable ignition drive circuits
And computer, the controller include MC9S12DG128BCPV main control chip, every group of programmable ignition drive circuit includes omnipotent point
Firearm, inductance type high voltage package and resistor plug；Software section includes bottom code and host computer, realizes computer and controller
Communication.
9. a kind of multi-functional CONSTANT VOLUME MODEL COMBUSTION CHAMBER of multi-point spark according to claim 8, it is characterised in that: described to compile
Journey ignition drive circuit includes two parts, and first part is made of clamp circuit, RC parallel circuit and switching circuit, realizes control
The positive and negative separation to step signal of device, second part may be programmed Ignition chip by TN003 and peripheral circuit forms, and realizes different
Ignition curve design requirement.
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| CN201811115936.3A CN109164204B (en) | 2018-09-25 | 2018-09-25 | Multi-functional constant volume burner of multiple spot ignition |
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| CN201811115936.3A CN109164204B (en) | 2018-09-25 | 2018-09-25 | Multi-functional constant volume burner of multiple spot ignition |
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