CN100516476C - Direct-spraying diesel engine combustion device - Google Patents
Direct-spraying diesel engine combustion device Download PDFInfo
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- CN100516476C CN100516476C CNB2007100596147A CN200710059614A CN100516476C CN 100516476 C CN100516476 C CN 100516476C CN B2007100596147 A CNB2007100596147 A CN B2007100596147A CN 200710059614 A CN200710059614 A CN 200710059614A CN 100516476 C CN100516476 C CN 100516476C
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- circular arc
- diesel engine
- firing chamber
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- wall
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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
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Abstract
The present invention relates to a combustion train of a direct injection diesel engine, and comprises an Omega-shaped firebox. The inner wall of the firebox is axisymmetric and the cross section of the inner wall of the firebox has a circular arc with a small curvature 6. A stream guidance border of abrupt-change cross section is arranged on the cross section of the inner wall of the firebox. The stream guidance border of the cross section comprises a circular arc with a large curvature 4 and a beeline 5. One end of the circular arc with a large curvature 4 derives from the circular arc with a small curvature 6 and the other end connects with the circular arc with a small curvature 6 by the beeline 5. The combustion train of the prevent invention can realize the fast mixture of the air and the diesel oil in the vat during the middle and late period of burning, and the control of space distribution of the fuel to realize the high efficiency and the clean burning of the diesel engine.
Description
Technical field
The invention belongs to a kind of diesel engine with direct injection parts, the particularly a kind of firing unit that can realize the burning of direct injection diesel engine high-efficiency cleaning.
Background technique
Exhausted day by day and environmental pollution is serious day by day along with world petroleum resource, the research of diesel engine high-efficiency cleaning combustion technology always is the hot subject that international internal-combustion engine circle is studied.Since the nineties in last century, it is active that the diesel combustion theoretical research more becomes, Abgasgesetz at following minimum discharge even zero-emission, people have proposed the novel combustion manner of different internal-combustion engines, in various novel combustion manners, with homogeneous compression-ignition (Homogeneous Charge Compression Ignition, HCCI) and the low-temperature burning process (Low Temperature Combustion, LTC) the most representative.No matter be homogeneous compression-ignition or low-temperature burning, all require before involuntary ignition, to form the mixed gas that rationally distributes; And in the burning middle and later periods, having fast, mixing rate impels uHC and CO to CO
2Conversion.How at short notice but the viscosity of diesel oil is big, and volatility is poor, the core difficult problem in (fast) preparation and the control diesel oil mixed gas distribution in cylinder the becoming high-efficiency cleaning diesel engine development process.
Domestic and international research shows that the source of mixed tensor mainly contains two in the diesel engine: the one, and the energy that injection system provides; The 2nd, the energy that air motion provides in the cylinder.The energy that improves wherein any one can both effectively promote mixed process.Based on this reason, the high pressure fuel injection system is widely used.At present, the injection system pressure of volume production is up to 160MPa, and more (＞injection system 200MPa) is also in active development for high pressure.High-pressure injection makes jet have high momentum, the high mixing rate in having realized between fuel injection period, and the discharging of Diesel NOx and particulate is significantly reduced.But, in during burning middle and later periods, the especially after end of injection, how to promote the mixing rate between oil/gas, burnt gas/fresh charge to become the obstacle of further reduction discharging.On the other hand, the fuel oil of various degrees hits the wall phenomenon in diesel engine, and especially in the diesel engine of medium and small cylinder diameter, after improving jet pressure, the penetration degree of spraying increases, and it is inevitable especially that the oil bundle hits the wall phenomenon.After the oil bundle hit wall, a part of loss of momentum was fallen, and another part Conversion of energy is to form the wall jet energy along the combustion chamber wall surface development.Under the effect of the resistance of wall friction and ambient gas, the speed of wall jet is far smaller than the speed of free spray, and mixing rate reduces greatly.And injection process does not finish as yet, causes fuel oil to be deposited on wall in a large number, forms thick about 2～3mm and from the near more high more fuel oil sedimentation layer of its mixture strength of zone of wall.Studies show that the deposition of this wall spraying and spraying flame De temper put out the major reason of burn deterioration just.How promoting the mixing rate of wall jet and improving this disadvantageous fuel oil distribution mode becomes active demand in the combustion system exploitation.
(publication number: main distinction CN1414226A) is: the combustion chamber features of being invented in the CN1414226A patent of invention is the patent of invention of being applied for before the present invention and the inventor: the prominent edge that is provided with on combustion chamber wall surface.And be pilot arc and abrupt-change cross section on the combustion chamber wall surface in major character of the present invention.
Summary of the invention
Purpose of the present invention just is to overcome the deficiency that exists in the above-mentioned prior art scheme, and provide a kind of direct injection diesel engine efficient low-discharging firing unit, this device can realize burning diesel oil and air in the intermediary and later stages cylinder rapid mixing and control the space distribution of fuel oil, thereby realize efficient, the clean burning of diesel engine.
Technological scheme of the present invention is:
A kind of direct-spraying diesel engine combustion device, comprise the firing chamber, described firing chamber is the ω type, the inwall axisymmetric of firing chamber, the firing chamber inner wall section has small curve circular arc 6, has abrupt-change cross section water conservancy diversion edge on the inner wall section of firing chamber, and described cross section water conservancy diversion is along comprising deep camber circular arc 4 and straight line 5, one end of described deep camber circular arc 4 is drawn from small curve circular arc 6, and the other end links to each other with small curve circular arc 6 with straight line 5.
The present invention has the following advantages:
1. this firing unit will harmful originally fuel oil hits the wall phenomenon and guides by wall dexterously, and through abrupt-change cross section peel off the effect Spray Impingement energy is utilized effectively, effective scheme in the high composite rate of realization of burning middle and later periods, especially after end of injection is provided;
2. thereby this programme amount of effectively reducing the wall sprayed deposit has reduced the ratio that spraying flame De temper puts out, and burning is improved;
3. wall jet forms the space jet once more under the effect on abrupt-change cross section water conservancy diversion edge, and forms shear layer between the burning indoor air, impels turbulence intensity to increase, and composite rate is strengthened greatly, and the distribution of fuel oil in cylinder more becomes even;
4. this firing unit is strong to the adaptability of modern fuel injection system.The characteristic that firing chamber itself has burning middle and later periods rapid mixing in conjunction with the high pressure fuel injection system, can realize the combustion process of the high composite rate of full course, reduces NOx and carbon smoke exhaust;
5. the mixing rate of firing unit is fast, therefore can postpone fuel supply advance angle, and the maximum combustion temperature in the cylinder reduces, and high-temperature duration reduces; Maximum outbreak pressure and voltage rise rate descend, and the heat load and the mechanical load of motor all are reduced, and are applicable to the supercharged diesel engine that reinforcing degree is high;
6. this firing unit does not need to change the structure of miscellaneous part as long as change the structure of piston head.Simultaneously, big to the range of tolerable variance of oily interfascicular angle, therefore be easy to promote the use of, have wide industrialization prospect.
Description of drawings
Fig. 1 embodiment of the invention 1 chamber structure schematic representation;
Fig. 2 embodiment of the invention 2 chamber structure schematic representation;
The fundamental diagram of Fig. 3 firing unit of the present invention.
1. oil nozzle 2. cylinder cap bottom surfaces 3. piston upper bottom surfaces 4. deep camber circular arcs
5. transition straight line 6. small curve circular arcs 7. fuel spray 8. abrupt-change cross section water conservancy diversion
The edge
Embodiment
Below in conjunction with drawings and Examples the present invention is further described.
The present invention is directed to traditional toroidal combustion chamber's defective and improved, Fig. 1 is the structural representation of the embodiment of the invention, and this figure is the sectional view that passes through the medial axis of firing chamber of the present invention.With certain suitable place on the internal face of firing chamber (according to the decision of oil bundle drop point) is the circular arc that initial point is drawn two sections different curvature.The little circular arc of its mean curvature 6 constitutes traditional toroidal combustion chamber's scheme, and after the big circular arc 4 of curvature develops into suitable position, links to each other with small curve circular arc 6 with straight line 5, thus the combustion chamber wall surface structure of realization abrupt-change cross section.Concentrate for fear of thermal stress, deep camber circular arc 4 seamlessly transits with suitable circular arc 8 with straight line 5.In the present invention this structure is referred to as the abrupt-change cross section water conservancy diversion along 8.
Said mutation cross section water conservancy diversion 8 is seen Fig. 2 along designing a plurality of abrupt-change cross section water conservancy diversion edge according to engine operation condition scope, displacement size and the injection system that matches (these parameter decision oil injection durations).
The present invention has realized the sudden change in cross section dexterously by the circular arc of different curvature on the direct injection diesel engine combustion chamber wall surface of reality, referring to Fig. 3, the high pressure fuel of ejection oil bundle 7 is after bumping against combustion chamber wall surface from oil sprayer 1, break away from wall at the abrupt-change cross section place through the guiding of wall circular arc, form the quadratic space jet.Secondary jet induces the opposite whirlpool group of a pair of rotation direction in cylinder.Whirlpool group's size has comparable yardstick with the physical dimension of structure itself.Along in the firing chamber, combustion process is by " half surface " " full surface " burning when burning transfers the quadratic space jet to of wall jet at water conservancy diversion.In the present embodiment, compare, in the end of injection average equivalent ratio reduction by 33.1% of new departure intermediate fuel oil mixed zone constantly with the traditional combustion scheme.Compare original ω firing chamber, the burning back remains unchanged substantially in the NOx discharging of g/kWh, and carbon smoke exhaust descends then up to 55%.
The running state of oily wire clamp angle, spray cone angle, jet pressure and the motor of the height of the abrupt-change cross section of arranging in the actual diesel engine firing chamber, direction, the shape that is in the position in space and Actual combustion chamber, oil nozzle is relevant.Oily wire clamp angle, the curvature of deep camber circular arc 4 and the development terminal point of circular arc 4 by the optimization of matching spraying, can control the length of wall jet itself and quadratic space jet position at the place, space, realize the combustion process of the high composite rate of full course, thereby realize the diesel engine combustion of high-efficiency cleaning.
Claims (1)
1. direct-spraying diesel engine combustion device, comprise the firing chamber, described firing chamber is the ω type, the inwall axisymmetric of firing chamber, the firing chamber inner wall section has small curve circular arc (6), it is characterized in that, on the inner wall section of firing chamber, has abrupt-change cross section water conservancy diversion edge, described cross section water conservancy diversion is along comprising deep camber circular arc (4) and line segment (5), with the position according to the decision of oil bundle drop point on the internal face of firing chamber is that initial point is drawn deep camber circular arc (4), one end of deep camber circular arc (4) and small curve circular arc (6) intersect, and the other end links to each other with small curve circular arc (6) with line segment (5), and deep camber circular arc (4) seamlessly transits with circular arc (8) with line segment (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100596147A CN100516476C (en) | 2007-09-14 | 2007-09-14 | Direct-spraying diesel engine combustion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100596147A CN100516476C (en) | 2007-09-14 | 2007-09-14 | Direct-spraying diesel engine combustion device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101117910A CN101117910A (en) | 2008-02-06 |
| CN100516476C true CN100516476C (en) | 2009-07-22 |
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ID=39054150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100596147A Expired - Fee Related CN100516476C (en) | 2007-09-14 | 2007-09-14 | Direct-spraying diesel engine combustion device |
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| Country | Link |
|---|---|
| CN (1) | CN100516476C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769195A (en) * | 2010-03-17 | 2010-07-07 | 大连理工大学 | Combustion system of scattered space type direct injection diesel engine |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102661193B (en) * | 2012-05-16 | 2013-09-04 | 大连理工大学 | Double-layer split-flow burning system of direct-injection diesel engine |
-
2007
- 2007-09-14 CN CNB2007100596147A patent/CN100516476C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769195A (en) * | 2010-03-17 | 2010-07-07 | 大连理工大学 | Combustion system of scattered space type direct injection diesel engine |
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| Publication number | Publication date |
|---|---|
| CN101117910A (en) | 2008-02-06 |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090722 Termination date: 20210914 |