CN101793206B - Direction-injection diesel engine combustion chamber - Google Patents
Direction-injection diesel engine combustion chamber Download PDFInfo
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- CN101793206B CN101793206B CN201010126631XA CN201010126631A CN101793206B CN 101793206 B CN101793206 B CN 101793206B CN 201010126631X A CN201010126631X A CN 201010126631XA CN 201010126631 A CN201010126631 A CN 201010126631A CN 101793206 B CN101793206 B CN 101793206B
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- Prior art keywords
- diesel engine
- combustion chamber
- convex arc
- injection
- guiding convex
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 32
- 238000002347 injection Methods 0.000 title claims abstract description 28
- 239000007924 injection Substances 0.000 title claims abstract description 28
- 239000007921 spray Substances 0.000 claims abstract description 33
- 238000010304 firing Methods 0.000 claims description 15
- 230000006698 induction Effects 0.000 claims description 3
- 210000003141 lower extremity Anatomy 0.000 claims description 2
- 238000002156 mixing Methods 0.000 abstract description 10
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 238000013517 stratification Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 14
- 239000007789 gas Substances 0.000 description 12
- 239000003570 air Substances 0.000 description 11
- 239000000446 fuel Substances 0.000 description 9
- 239000000295 fuel oil Substances 0.000 description 7
- 239000000779 smoke Substances 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000004071 soot Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009510 drug design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 239000010721 machine oil Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
The invention discloses a direction-injection diesel engine combustion chamber, belonging to the technical field of internal combustion engine structures and combustion devices. The invention is characterized in that guide convex arcs and small steps are arranged on the wall surface of the combustion chamber. The guide convex arcs and the small steps are arranged fully circumferentially, intermittently or locally. The positions of the guide convex arcs and the small steps on the wall surface are related to the shape of the combustion chamber, the size of injection holes, the angle of the injection holes, oil injection pressure, intake swirl ratio and other parameters. The cross section of each guide convex arc is semicircular, elliptic and the like. The technology adopts the guide bundle spray and stratification theory, adopts 'double wall surface injection' method to inhibit the generation of high-concentration NO at the tips of flames and promotes the mixing of the spray tips. The invention has the advantages that the even mixed gas can be formed at the premixing combustion step, the rapid mixing of oil and gas is realized, the travel time of carbon granules is shortened and thereby the oxidization time of the carbon granules is increased.
Description
Technical field
The invention belongs to internal-combustion engine structure and firing unit technical field, relate to a kind of firing chamber of direct injection diesel engine.
Background technique
Existing diesel engine with direct injection is a feature with uneven astable spray burning, the very sufficient neighboring area of air supply reaches a high temperature in the fuel spray, and, on the other hand, generate PM in the superfluous zone of the fuel oil of air quantity deficiency because of remaining oxygen generates NOx in a large number.In occasion based on the traditional diesel combustion of turbulent diffusion combustion, from having only zone that air exists to the zone of having only fuel oil to exist, the mixing air parcel that has various concentration, and mixed gas is present in NOx simultaneously and the carbon granules formation speed is regional faster.This also just becomes and reduces NOx and the comparatively difficult reason of PM simultaneously.Homogeneous compression-ignition (HCCI) is a kind of more attracting new combustion manner, has the potentiality that reduce NOx and soot growing amount.But, before the motor that adopts HCCI becomes a kind of matured product, also have many problems to wait to solve.The for example control of the control of combustion phase and rate of heat release is compared working zone little (low to moderate duty) with conventional diesel engine with spark-ignition engine, and HC and CO discharging height.In addition, the HCCI of combustion diesel fuel has its special problem, i.e. the formation of fuel-air mixture in the cylinder.Carrying out the premixed common method of oil gas in motor is the method that adopts spray early or spray in evening.Spray morning is divided into interior early stage injection of compression stroke after intake port injection and the valve-closing, and it is simple, inexpensive and can generate the enough good mixed gas of mixing, but diesel oil adopts intake port injection to have any problem, because its boiling point is higher, causes evaporating very poor; The interior early stage injection of cylinder also exists HC and the CO discharging is higher and fuel spray is attached to cylinder liner wall dilution machine wet goods problem.Evening, spray was After Top Center to spray, and than the mixing rate that increases oil gas, still along with the increasing of engine load, the increase of fuel injection quantity can't guarantee that fuel oil all sprays into the firing chamber before catching fire by high-eddy.
Summary of the invention
The invention provides a kind of direction-injection diesel engine combustion chamber that can reduce Diesel NOx concentration and particle emission simultaneously, overcome the existing deficiency of HCCI combustion system, realized the low emissions combustion of diesel engine, be the homogenization and the low-temperature burning of diesel engine mixed gas, guaranteed that diesel engine realizes low NOx drainage, low smoke intensity and high degree of constant volume in the whole working condition scope.
Technological scheme of the present invention is:
A kind of direction-injection diesel engine combustion chamber is characterized in that combustion chamber wall surface is provided with guiding convex arc and small stair.Being provided with of guiding convex arc and small stair can be complete circumferential, intermittent or local.
Relating to parameters such as the shape of the guiding convex arc on the wall and the position of small stair and firing chamber, spray orifice size, angle between spray orifices, injection pressure, induction swirl ratio.The height of projection of described guiding convex arc is 0.5～3.0mm, and guiding convex arc cross section is structures such as semicircle, ellipse.The tangential dimension of the step surface of described small stair is 0.5～3.5mm, and the angle on the tangential direction of step surface and piston head plane is 0～50 °.
The advantage of " double-walled wall jet " technology of employing is:
1. avoided big, produced soot, and form the mixed gas of stoichiometric(al) in the outer zone of oil bundle, produced the waste gas phenomenon of high NOx concentration in the intrafascicular heart of conventional diesel machine oil zone fuel oil concentration.
2. traditional diesel engine generate a large amount of NOx main causes be summed up as the most advanced and sophisticated mixing intensity of spraying a little less than, combustion gas and flame tip and ambient air clash, and lose momentum rapidly, air-flow stops for a long time at high-temperature area.For being suppressed at the most advanced and sophisticated NOx that generates high concentration of flame, promote the mixing that spraying is most advanced and sophisticated, make fluidal texture in the flame near the structure of stable state jet flames, we have adopted " double-walled wall jet " technology.
3. double-walled wall jet " technology belongs to a kind of of scattered space type space spraying.The main cause that the direct injection diesel engine soot generates is liquid fuel or the dense air fuel ratio mixed gas and the interaction of flame, and fuel oil is sprayed onto the burned region territory, can generate a large amount of soots.Diffusion control burning than great share can cause higher carbon smoke exhaust.Adopting the method for spatial dispersion can avoid liquid fuel to contact the aspect with flame produces disadvantageous interaction, improves the utilization ratio of air, improve local air fuel ratio, the reduction carbon smoke exhaust.
4. in the combustion system of diesel engine, the fuel oil in the firing chamber does not fully mix with air and produces a large amount of soots, and these zones are surrounded by the mixed gas of stoichiometric, and the temperature here is very high, and the tendency that forms NOx is arranged.Adopt " double-walled wall jet " technology, fuel oil is fully mixed with air, form even mixed gas postignition, thus the local temperature rising that causes owing to burning can be suppressed, thereby suppressed the growing amount of NOx under the high temperature.In addition, also because can shorten the burning phase, so it causes people's attention as the means that improve the thermal efficiency.
5. use " double-walled wall jet " technology, not only form even mixed gas, realize the rapid mixing of oil gas, reduce the diffusive combustion amount in the pre-mixing combustion stage, and in diffusive combustion,, the shortening of diffusive combustion duration increased its oxidization time owing to shortening the carbon granules rise time.
The invention has the beneficial effects as follows: the present invention is not increasing oil consumption and is keeping reducing the NOx and the particle emission of diesel engine significantly under the prerequisite of former mechanomotive force.The design has carried out experimental study and optimal design on the cold four-cylinder diesel engine in Vehicle Turbocharged, obtained desirable test result.At the diesel engine torque point, smoke intensity is 0.4BSU, and the concentration of NOx is 460ppm, and rate of fuel consumption is suitable with former machine, is 215g/ (Kw.h); Calibration point, smoke intensity are at 0.6BSU, and the concentration of NOx is 360ppm, and rate of fuel consumption is 245g/ (Kw.h).Rules are put in discharging near Europe IV.
Description of drawings
Fig. 1 is a chamber structure schematic representation of the present invention.
Fig. 2 is the structural representation of combustion system of directly jetting diesel engine of the present invention.
Among the figure: 1 piston; 2 firing chambers; 3 bottom surfaces; 4 guiding convex arcs; 5 small stairs; 6 multiple orifice nozzles; 7 spray orifices; The fluid oil bundle of 8 multiple orifice nozzles ejection; 9 upper stratas spray bundle; 10 lower floors spray bundle.
Embodiment
In Fig. 1, firing chamber 2 of the present invention is characterized in that circumferentially being provided with on the inwall of firing chamber 2 guiding convex arc 4 and small stair 5 on piston 1, and bottom surface 3 is convex table type (bottom surface 3 also can be designed to patterns such as taper, flat, sphere).As can be seen from Figure 1, firing chamber 2 is reducing shape, also can be designed to the straight shape of the mouth as one speaks or uncovered type.
The fluid oil bundle 8 of multiple orifice nozzle ejection impinges upon on 2 walls of firing chamber, the guiding convex arc 4 on wall and the reflection of small stair 5, and bundle 10 is sprayed in the upper strata spray bundle 9, the lower floor that form the layering wall jet, is called for short " double-walled wall jet ", as shown in Figure 2.
Diesel engine with direct injection low emission combustor of the present invention is applicable to that too high-pressure common rail sprays in conjunction with direct injection diesel engine such as multi-injection, electronically controlled unit pumps.
Claims (4)
1. direction-injection diesel engine combustion chamber, circumferentially be provided with guiding convex arc (4) and small stair (5) on the wall of firing chamber (2), it is characterized in that: the oil bundle (8) of ejection is in the top edge of the wall impingement region top at guiding convex arc (4), lower limb is in the below of guiding convex arc (4), the top of small stair (5), and oil bundle (8) is divided into two-part up and down after the reflection of guiding convex arc (4) and small stair (5).
2. a kind of direction-injection diesel engine combustion chamber according to claim 1, its feature also is: shape, spray orifice size, angle between spray orifices, injection pressure, the induction swirl ratio relating to parameters of the guiding convex arc (4) on the wall and the position of small stair (5) and firing chamber.
3. a kind of direction-injection diesel engine combustion chamber according to claim 1 and 2, its feature also is: the height of projection of described guiding convex arc (4) is 0.5～3.0mm; The step surface tangential dimension of described small stair (5) is 0.5～3.5mm, and the angle on step surface tangential direction and piston head plane is 0～50 °.
4. a kind of direction-injection diesel engine combustion chamber according to claim 3, its feature also is: guiding convex arc (4) cross section is for semicircle or oval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010126631XA CN101793206B (en) | 2010-03-17 | 2010-03-17 | Direction-injection diesel engine combustion chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010126631XA CN101793206B (en) | 2010-03-17 | 2010-03-17 | Direction-injection diesel engine combustion chamber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101793206A CN101793206A (en) | 2010-08-04 |
| CN101793206B true CN101793206B (en) | 2011-07-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010126631XA Expired - Fee Related CN101793206B (en) | 2010-03-17 | 2010-03-17 | Direction-injection diesel engine combustion chamber |
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| CN (1) | CN101793206B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6232954B2 (en) * | 2013-11-12 | 2017-11-22 | トヨタ自動車株式会社 | Internal combustion engine |
| CN112112725A (en) * | 2020-09-28 | 2020-12-22 | 华中科技大学 | Combustion chamber system suitable for high-power-density diesel engine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1556313A (en) * | 2004-01-06 | 2004-12-22 | 大连理工大学 | Direct spraying type diesel engine combustion system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2594054B2 (en) * | 1987-06-08 | 1997-03-26 | トヨタ自動車株式会社 | Direct injection diesel engine |
| JPH01124039U (en) * | 1988-02-15 | 1989-08-23 | ||
| JPH05163946A (en) * | 1991-12-13 | 1993-06-29 | Kubota Corp | Direct injection type combustion chamber of diesel engine |
| JP4002823B2 (en) * | 2002-12-11 | 2007-11-07 | ヤンマー株式会社 | Engine combustion chamber |
| KR20090064227A (en) * | 2007-12-15 | 2009-06-18 | 현대자동차주식회사 | Combustion chamber structure of engine for heavy duty vehicle |
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2010
- 2010-03-17 CN CN201010126631XA patent/CN101793206B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1556313A (en) * | 2004-01-06 | 2004-12-22 | 大连理工大学 | Direct spraying type diesel engine combustion system |
Non-Patent Citations (4)
| Title |
|---|
| JP平1-124039U 1989.08.23 |
| JP昭63-306220A 1988.12.14 |
| JP特开2004-190572A 2004.07.08 |
| JP特开平5-163946A 1993.06.29 |
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| Publication number | Publication date |
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| CN101793206A (en) | 2010-08-04 |
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Granted publication date: 20110720 Termination date: 20140317 |