CN103046997A - Diesel engine and combustor thereof - Google Patents
Diesel engine and combustor thereof Download PDFInfo
- Publication number
- CN103046997A CN103046997A CN2012105832645A CN201210583264A CN103046997A CN 103046997 A CN103046997 A CN 103046997A CN 2012105832645 A CN2012105832645 A CN 2012105832645A CN 201210583264 A CN201210583264 A CN 201210583264A CN 103046997 A CN103046997 A CN 103046997A
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- Prior art keywords
- firing chamber
- diesel engine
- annular groove
- combustor
- pit
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- 238000010304 firing Methods 0.000 claims description 104
- 238000005259 measurement Methods 0.000 claims description 10
- 239000000446 fuel Substances 0.000 abstract 2
- 239000000295 fuel oil Substances 0.000 description 33
- 239000003921 oil Substances 0.000 description 12
- 102000001999 Transcription Factor Pit-1 Human genes 0.000 description 6
- 108010040742 Transcription Factor Pit-1 Proteins 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 6
- 239000000567 combustion gas Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000002283 diesel fuel Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Images
Classifications
-
- 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 combustor which comprises a pit arranged at the bottom of the combustor and an annular groove arranged above the pit. The annular groove is arranged on the inner side wall of the combustor, a first bottom edge of the annular groove and a second top edge of the pit are coincident, a first top edge of the annular groove abduces towards a direction far away from the axis of the combustor relative to the first bottom edge, a first distance of the first top edge and the first bottom edge in a direction of a parallel axis is 30-50% of the maximum height of the combustor in the direction, and the volume of the annular groove is 10-15% of the total volume of the combustor. Consequently, the combustor can forcefully divide fuel entering the combustor into different circulating routes in a physical structure manner, so that uniformity of the fuel and air is improved, and pollution degree of exhaust gas emission is lowered. The invention further discloses a diesel engine comprising the combustor.
Description
Technical field
The present invention relates to technical field of engineering machinery, particularly a kind of firing chamber for diesel engine.The invention still further relates to a kind of diesel engine that comprises above-mentioned firing chamber.
Background technique
Along with the raising of people's environmental consciousness, the pollution problem of diesel engine has obtained paying close attention to widely, and nitrogen oxide and particle thereof are the major pollutants of diesel engine exhaust emission, and harmfulness is larger, is the emphasis of Exhaust Control for Diesel Engine always; Diesel engine uses oil sprayer to do work to provide energy with diesel oil direct cylinder injection internal combustion, be the mixing of the diesel oil oil bundle that oil sprayer sprays oil gas with the formation condition of the combustion efficiency of the mixing uniformity appreciable impact diesel oil of the interior air of cylinder and pollutant in the firing chamber of cylinder, to finish, therefore, the mixing uniformity of the structure of firing chamber and shape and oil gas is closely related, and then affects economic performance and the emission performance of diesel engine.
Please refer to Fig. 1, Fig. 1 is a kind of typical structural representation that is used for the firing chamber of diesel engine.
In a kind of firing chamber of typical diesel engine, its sectional shape is ω shape, the center of firing chamber has two pits 01, and fuel oil mixes in the active combustion volume is pit 01 with air, and the oil bundle is when entering the firing chamber, can only enter pit 01 mixes with air, the path that fuel oil mixes with air is unique, and can only form the circulation of a direction, so that fuel oil distributes in the firing chamber is more inhomogeneous, cause the mixing uniformity of fuel oil and air relatively poor
When emission request further improved, this firing chamber will be very restricted for the contribution of discharging, need to just can satisfy condition by the requirement that improves after-treatment system, had caused the rising of cost.
Therefore, change the structure of firing chamber, be divided into different closed loop flow path so that enter the fuel oil of firing chamber, thereby improve the uniformity that fuel oil mixes with air, reduce the pollution level of exhaust emissions, need the problem of solution with regard to becoming those skilled in the art badly.
Summary of the invention
The purpose of this invention is to provide a kind of firing chamber for diesel engine, its fuel oil that can will enter forcibly in the firing chamber on physical arrangement is divided into different closed loop flow path, thereby improved the uniformity that fuel oil mixes with air, reduced the pollution level of exhaust emissions.Another object of the present invention provides a kind of diesel engine that comprises above-mentioned firing chamber.
For solving the problems of the technologies described above, the invention provides a kind of firing chamber for diesel engine, comprise the pit of being located at its bottom, also comprise the annular groove of being located at described pit top, described annular groove is opened in the madial wall of described firing chamber, and its first base overlaps with the second top margin of described pit; To the direction abduction away from medial axis, described firing chamber, the volume of described annular groove is 10% ~ 15% of described firing chamber total measurement (volume) to the first top margin of described annular groove with respect to described the first base.
Preferably, the outer side wall of described annular groove comprises the arc surface of bottom surface, side and connection bottom surface and side; The intersection point of described side and described bottom surface is 30% ~ 35% of the axial maximum height in described firing chamber apart from the first distance of described the first top board.
Preferably, the radius of described arc surface is 70% ~ 80% of described the first distance.
Preferably, the distance at described bottom surface inner terminal point and center, described firing chamber is 75% ~ 80% of described firing chamber maximum diameter.
Preferably, the angle between described bottom surface and the horizontal plane is 8 ° ~ 12 °.
Preferably, the angle between described side and the horizontal plane is 80 ° ~ 100 °.
Preferably, the sidewall of described pit and the angle between the horizontal plane are 55 ° ~ 65 °.
Preferably, the volume of described annular groove is 13% of described firing chamber total measurement (volume).
Preferably, the first distance is described firing chamber in 32% of the maximum height of parallel described medial axis direction.
The present invention also provides a kind of diesel engine, comprises piston, cylinder and the firing chamber between the end face of the cylinder cap bottom surface of described cylinder and described piston; Described firing chamber is aforesaid firing chamber.
Firing chamber provided by the present invention is used for diesel engine, and this firing chamber comprises the pit of being located at its bottom and be located at the annular groove of described pit top that annular groove is opened in the madial wall of firing chamber, and its first base overlaps with the second top margin of pit; To the direction abduction away from the medial axis, firing chamber, the volume of annular groove is 10% ~ 15% of firing chamber total measurement (volume) to the first top margin of annular groove with respect to the first base.
The intersection of the first base of the annular groove of chamber structure provided by the present invention and the first top margin of pit has formed middle arc ridge, middle arc ridge protrudes to the direction near the center, firing chamber, after fuel oil enters the firing chamber, effect by middle arc ridge makes fuel oil be divided into up and down two parts, and because the space of annular groove is larger, can guide abundant fuel oil to form second circulation by the space of groove side above groove, the interior air of part fuel oil and top, firing chamber and groove is mixed; Lower part fuel oil mixes in air in pit; Like this, so that the fuel oil that the firing chamber can will enter in the firing chamber forcibly is divided into different closed loop flow path, thereby improve the uniformity that fuel oil mixes with air on physical arrangement, reduced the pollution level of exhaust emissions.
In a kind of embodiment, the outer side wall of annular groove provided by the present invention comprises the arc surface of bottom surface, side and connection bottom surface and side, and the radius of this arc surface is 70% ~ 80% of the first distance of forming apart from the first end face of the intersection point of side and bottom surface, bottom surface inner terminal point is 75% ~ 80% of firing chamber maximum diameter with the distance at center, firing chamber, angle between bottom surface and the horizontal plane is 8 ° ~ 12 °, and the angle between side and the horizontal plane is 80 ° ~ 100 °; On fluid mechanics principle, the annular groove in the firing chamber adopts said structure can further guarantee the shunting of fuel oil in the firing chamber, thereby further improves the mixing uniformity of fuel oil.
In another kind of embodiment, firing chamber provided by the present invention, the sidewall of its pit and the angle between the horizontal plane are 55 ° ~ 65 °, in order to guarantee that the firing chamber actual volume is larger, and strengthen and squeeze the whirlpool intensity that the stream effect forms, further improve the uniformity of combustion gas mixing.
Description of drawings
Fig. 1 is a kind of typical structural representation that is used for the firing chamber of diesel engine;
Fig. 2 is the structural representation of a kind of embodiment in firing chamber provided by the present invention;
Fig. 3 is the combustion gas flow graph of firing chamber shown in Figure 2.
Embodiment
Core of the present invention provides a kind of firing chamber for diesel engine, its fuel oil that can will enter forcibly in the firing chamber on physical arrangement is divided into different closed loop flow path, thereby improved the uniformity that fuel oil mixes with air, reduced the pollution level of exhaust emissions.Another core of the present invention provides a kind of diesel engine that comprises above-mentioned firing chamber.
In order to make those skilled in the art person understand better the present invention program, the present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Please refer to Fig. 1 and Fig. 2, Fig. 1 is the structural representation of a kind of embodiment in firing chamber provided by the present invention; Fig. 2 is the combustion gas flow graph of firing chamber shown in Figure 1.
In a kind of embodiment, firing chamber provided by the present invention is used for diesel engine, this firing chamber comprises the pit 2 of being located at its bottom and the annular groove 1 of being located at described pit 2 tops, annular groove 1 is opened in the madial wall of firing chamber, and its first base overlaps with the second top margin of pit 2, both form the arc ridge that protrudes in overlapping position, and the arc ridge protrudes towards the inside of firing chamber; To the direction abduction away from the medial axis, firing chamber, the volume of annular groove 1 is 10% ~ 15% of firing chamber total measurement (volume) to the first top margin of annular groove 1 with respect to the first base.
The volume of above-mentioned annular groove 1 is preferably 13% of firing chamber total measurement (volume), in order to can either guarantee the combustion efficiency of firing chamber, can realize again the shunting of fuel oil 4 in the firing chamber; Apparently, the volume of annular groove 1 also is not limited to 13% of firing chamber total measurement (volume), as long as can there be enough space to guarantee that the fuel oil 4 that enters annular groove 1 forms circulation, also can be 11%, 12% or 14% etc. of firing chamber total measurement (volume) such as the volume of annular groove 1.
The sidewall of above-mentioned pit 2 and the angle γ between the horizontal plane are 55 ° ~ 65 °, in order to guarantee that the firing chamber actual volume is larger, and strengthen the whirlpool intensity of squeezing stream effect formation, further improve the uniformity of combustion gas mixing; Preferably, this angle γ is 58 °, also can be 57 °, 60 ° or 62 ° etc.
It is to be noted, the oil spout condition competence exertion that all will work good in any firing chamber goes out reasonable effect, therefore need to select the suitable oil sprayer of oil spout angle, can by the zero hour of control oil spout and the oil bundle drop point that power-up time comes the indirectly control oil spout, finally realize the mixed combustion mode of many circulation in the diesel engine calibration process.
The intersection of the first base of the annular groove 1 of chamber structure provided by the present invention and the first top margin of pit 2 has formed middle arc ridge, middle arc ridge protrudes to the direction near the center, firing chamber, after fuel oil 4 enters the firing chamber, effect by middle arc ridge makes fuel oil 4 be divided into up and down two parts, and because the space of annular groove 1 is larger, can guide abundant fuel oil to form second circulation by the space of groove side above groove, the interior air of part fuel oil and top, firing chamber and groove is mixed; Lower part fuel oil 4 mixes in air in pit 2; Like this, so that the fuel oil 4 that the firing chamber can will enter in the firing chamber forcibly is divided into different closed loop flow path, thereby improve the uniformity that fuel oil 4 mixes with air on physical arrangement, reduced the pollution level of exhaust emissions.
It is pointed out that ordinal numbers such as " first, second " described in the literary composition is in order to distinguish the different structure of same names, only for convenience of description, not represent certain order, more should not be construed as certain restriction.
Preferably, the outer side wall of above-mentioned annular groove 1 comprises the arc surface of bottom surface, side and connection bottom surface and side, produces circulation with the combustion gas of forcing better to enter annular groove 1; Apparently, the outer side wall of above-mentioned annular groove 1 also is not limited to said structure, as long as can guarantee that volume is enough large, and can form circulation in annular groove 1 and gets final product, and for example, also can be oval-shaped arc shaped surface or simple arc surface etc.
The intersection point of side and bottom surface is apart from the first distance of the first end face, be 30% ~ 35% of the axial maximum height in firing chamber, this first distance can be specially 32% of the axial maximum height in firing chamber, apparently, also be not limited to 32%, as long as can realize the separation of fuel oil 4 and form respectively circulation.
The radius of above-mentioned arc surface can be 70% ~ 80% of the first distance, and arc surface inner terminal point is 75% ~ 80% of described firing chamber maximum diameter with the distance at center, described firing chamber; On fluid mechanics principle, the annular groove 1 in the firing chamber adopts said structure can further guarantee the shunting of fuel oil 4 in the firing chamber, thereby further improves the mixing uniformity of fuel oil.
In order to form preferably eddy current, and be arranged in the regional movement process of the fuel oil 4 that prevents from being divided into groove beyond the combustion recess 2 and directly be flushed on the cylinder wall surface, also need to select suitable bottom surface and the angle α between the horizontal plane and the angle β between side and the horizontal plane, preferably, angle α between above-mentioned bottom surface and the horizontal plane is 8 ° ~ 12 °, angle α is preferably 10 °, also can be the unspecified angle value between 8 ° to 12 °, such as 9 ° or 11 ° etc.; Angle β between side and the horizontal plane is 80 ° ~ 100 °, and angle β is preferably 90 °, also can be the unspecified angle between 80 ° to 100 °, and such as 85 ° or 95 ° etc. is to guarantee the fair charge of fuel oil 4 and cylinder wall surface.
It is diesel engine between 120mm ~ 130mm that firing chamber provided by the present invention is more suitable in cylinder bore, when being applied to the above-mentioned type diesel engine, the structural parameter of firing chamber provided by the present invention are preferably following scope: the ratio that annular groove 1 partial volume accounts for the firing chamber total measurement (volume) is between 10% ~ 15%, the ratio of the radius of the arc surface of annular groove 1 and the first distance should be between 0.7 ~ 0.8, bottom surface inner terminal point is compared with the axial maximum height in firing chamber apart from the distance of cylinder axis and is between 0.75 ~ 0.8, the intersection point of side and bottom surface is between 0.3 ~ 0.35 apart from the first distance of the first end face and the ratio of the axial maximum height in firing chamber, angle between bottom surface and the horizontal plane is about 10 °, and the angle between side and the horizontal plane is 55 ° ~ 65 °.
Except above-mentioned firing chamber, the present invention also provides a kind of diesel engine that comprises above-mentioned firing chamber, and other each several part structures of this diesel engine please refer to prior art, do not repeat them here.
More than a kind of diesel engine provided by the present invention and firing chamber thereof are described in detail.Used specific case herein principle of the present invention and mode of execution are set forth, above embodiment's explanation just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (10)
1. firing chamber that is used for diesel engine, comprise the pit (2) of being located at its bottom, it is characterized in that, also comprise the annular groove (1) of being located at described pit (2) top, described annular groove (1) is opened in the madial wall of described firing chamber, and its first base overlaps with the second top margin of described pit (2); To the direction abduction away from medial axis, described firing chamber, the volume of described annular groove (1) is 10% ~ 15% of described firing chamber total measurement (volume) to the first top margin of described annular groove (1) with respect to described the first base.
2. the firing chamber for diesel engine according to claim 1 is characterized in that, the outer side wall of described annular groove (1) comprises the arc surface of bottom surface, side and connection bottom surface and side; The intersection point of described side and described bottom surface is 30% ~ 35% of the axial maximum height in described firing chamber apart from the first distance of described the first end face.
3. the firing chamber for diesel engine according to claim 2 is characterized in that, the radius of described arc surface is 70% ~ 80% of described the first distance.
4. the firing chamber for diesel engine according to claim 3 is characterized in that, described bottom surface inner terminal point is 75% ~ 80% of described firing chamber maximum diameter with the distance at center, described firing chamber.
5. the firing chamber for diesel engine according to claim 4 is characterized in that, the angle between described bottom surface and the horizontal plane is 8 ° ~ 12 °.
6. the firing chamber for diesel engine according to claim 5 is characterized in that, the angle between described side and the horizontal plane is 80 ° ~ 100 °.
7. according to claim 1 to 6 each described firing chambers for diesel engine, it is characterized in that the sidewall of described pit (2) and the angle between the horizontal plane are 55 ° ~ 65 °.
8. according to claim 1 to 6 each described firing chambers for diesel engine, it is characterized in that the volume of described annular groove (1) is 13% of described firing chamber total measurement (volume).
9. according to claim 1 to 6 each described firing chambers for diesel engine, it is characterized in that the first distance is described firing chamber in 32% of the maximum height of parallel described medial axis direction.
10. diesel engine comprises piston, cylinder and the firing chamber between the end face of the cylinder cap bottom surface of described cylinder and described piston; It is characterized in that described firing chamber is such as each described firing chamber of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105832645A CN103046997A (en) | 2012-12-28 | 2012-12-28 | Diesel engine and combustor thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105832645A CN103046997A (en) | 2012-12-28 | 2012-12-28 | Diesel engine and combustor thereof |
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| Publication Number | Publication Date |
|---|---|
| CN103046997A true CN103046997A (en) | 2013-04-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN2012105832645A Pending CN103046997A (en) | 2012-12-28 | 2012-12-28 | Diesel engine and combustor thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017152203A1 (en) * | 2016-03-10 | 2017-09-14 | Avl List Gmbh | Air-compressing internal combustion engine |
| CN112879148A (en) * | 2021-01-25 | 2021-06-01 | 华中科技大学 | Asymmetric combustion chamber system suitable for high power density diesel engine |
| DE102022115682A1 (en) | 2021-06-24 | 2022-12-29 | Avl List Gmbh | COMBUSTION SYSTEM FOR AN AIR COMPRESSING ENGINE |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017152203A1 (en) * | 2016-03-10 | 2017-09-14 | Avl List Gmbh | Air-compressing internal combustion engine |
| AT518516A1 (en) * | 2016-03-10 | 2017-10-15 | Avl List Gmbh | PISTON FOR A AIR COMPRESSIVE INTERNAL COMBUSTION ENGINE |
| AT518516B1 (en) * | 2016-03-10 | 2018-03-15 | Avl List Gmbh | PISTON FOR A AIR COMPRESSIVE INTERNAL COMBUSTION ENGINE |
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| CN112879148A (en) * | 2021-01-25 | 2021-06-01 | 华中科技大学 | Asymmetric combustion chamber system suitable for high power density diesel engine |
| DE102022115682A1 (en) | 2021-06-24 | 2022-12-29 | Avl List Gmbh | COMBUSTION SYSTEM FOR AN AIR COMPRESSING ENGINE |
| AT525166B1 (en) * | 2021-06-24 | 2023-01-15 | Avl List Gmbh | COMBUSTION SYSTEM FOR AN AIR COMPRESSING ENGINE |
| AT525166A4 (en) * | 2021-06-24 | 2023-01-15 | Avl List Gmbh | COMBUSTION SYSTEM FOR AN AIR COMPRESSING ENGINE |
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Application publication date: 20130417 |