CN112879149A - Asymmetric combustion chamber system suitable for high power density diesel engine - Google Patents
Asymmetric combustion chamber system suitable for high power density diesel engine Download PDFInfo
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- CN112879149A CN112879149A CN202110097742.0A CN202110097742A CN112879149A CN 112879149 A CN112879149 A CN 112879149A CN 202110097742 A CN202110097742 A CN 202110097742A CN 112879149 A CN112879149 A CN 112879149A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0645—Details related to the fuel injector or the fuel spray
- F02B23/0663—Details related to the fuel injector or the fuel spray having multiple injectors per combustion chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0678—Unconventional, complex or non-rotationally symmetrical shapes of the combustion space, e.g. flower like, having special shapes related to the orientation of the fuel spray jets
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses an asymmetric combustion chamber system suitable for a high-power-density diesel engine, which belongs to the technical field related to diesel engines and comprises a combustion chamber, a main fuel injector vertically arranged on a cylinder cover and an auxiliary fuel injector obliquely arranged on the cylinder cover, wherein the bottom of the combustion chamber protrudes inwards to form an arc-shaped protruding part, the central vertex of the arc-shaped protruding part is eccentrically arranged with the central axis of a cylinder, and the central vertex of the arc-shaped protruding part is arranged on one side far away from the auxiliary fuel injector, so that the volume of a first pit of the combustion chamber on one side of the auxiliary fuel injector is larger than the volume of a second pit of the combustion chamber on one side. According to the invention, through the design of the asymmetric combustion chamber, the proportion of the air quantity at one side of the auxiliary fuel injector and one side far away from the auxiliary fuel injector can be adjusted, so that the air quantity is matched with the characteristics that the fuel quantity at one side of the auxiliary fuel injector is more and the fuel quantity at one side far away from the auxiliary fuel injector in the combustion chamber system is less, the problems of uneven and asymmetric distribution of the equivalence ratio in the combustion chamber are solved, and the rapid combustion and higher power-per-liter index are realized.
Description
Technical Field
The invention belongs to the technical field of diesel engines, and particularly relates to an asymmetric combustion chamber system suitable for a high-power-density diesel engine.
Background
In order to meet the requirement that the volume of a power cabin of a special vehicle (such as a tank) is continuously reduced, the strengthening degree of an engine is higher and higher, the power per liter index of the engine breaks through 100-110 kW/L, and the engine is developing towards the target of 120kW/L or higher. For safety and power reasons, the special engine is generally a diesel engine. Whereas diesel fuel is diffusion combustion dominated by spray mixing. To increase the power per liter of a diesel engine, the quantity and rate of fuel injected by the diesel engine are correspondingly increased. Therefore, a main oil injector and an auxiliary oil injector can be arranged in the cylinder, the main oil injector is vertically arranged in the center of the cylinder cover, the auxiliary oil injector is obliquely arranged on the outer side of the cylinder cover, the two oil injectors can simultaneously increase the overall oil injection rate, shorten the oil injection duration and meet the requirement of a high-power-density diesel engine on the oil injection rate.
However, fuel mist beams of the auxiliary fuel injector in the main and auxiliary fuel injection system are asymmetric about the central axis of the cylinder, so that the overall fuel distribution is asymmetric, the fuel on one side of the auxiliary fuel injector is more, and the fuel far away from the auxiliary fuel injector is less, so that the overall equivalence ratio distribution is uneven and asymmetric, and the combustion performance is influenced.
In summary, in the main and auxiliary fuel injection systems of the high-power-density diesel engine, the improvement of the nonuniformity and asymmetry of the equivalence ratio distribution is the key for optimizing the combustion performance of the diesel engine.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides an asymmetric combustion chamber system suitable for a high-power-density diesel engine, and aims to enable the pit volume of a combustion chamber at one side of an auxiliary fuel injector to be larger and to be more multiphase-adaptive with fuel at one side of the auxiliary fuel injector by carrying out asymmetric design on the combustion chamber, so that the technical problems of uneven distribution and asymmetry of equivalence ratio in the combustion chamber system of the traditional high-power-density diesel engine are solved.
To achieve the above object, according to one aspect of the present invention, there is provided an asymmetric combustion chamber system for a high power density diesel engine, comprising a combustion chamber provided in a piston, a main injector vertically provided in the center of a cylinder head, and a sub injector obliquely provided to the cylinder head,
the bottom of the combustion chamber protrudes inwards to form an arc-shaped protruding part;
the central vertex of the arc-shaped convex part is eccentrically arranged with the central axis of the cylinder, and the central vertex of the arc-shaped convex part is arranged on one side far away from the secondary fuel injector, so that the volume of a first pit of the combustion chamber on one side of the secondary fuel injector is larger than that of a second pit on one side far away from the secondary fuel injector.
Preferably, the middle part of the side wall of the combustion chamber is provided with an inward combustion chamber annular bulge so as to divide the combustion chamber into a combustion chamber upper-layer pit and a combustion chamber lower-layer pit;
the fuel oil mist beam sprayed by the main oil sprayer points to the annular bulge of the combustion chamber, the tail end of the fuel oil mist beam collides with the annular bulge of the combustion chamber, is divided into two upward and downward swirling flows, and respectively enters the upper-layer pit and the lower-layer pit of the combustion chamber in a wall surface jet flow mode.
Preferably, the molded line of the lower pit of the combustion chamber is in a necking shape to enhance the swirl strength entering the lower pit of the combustion chamber, so that the swirl flow entering the lower pit of the combustion chamber is larger than the swirl flow entering the upper pit of the combustion chamber, and the oil-gas mixing is promoted.
Preferably, the annular bulge of the combustion chamber is of an arc structure, and the arc structure is respectively connected with molded lines of the upper pit layer and the lower pit layer of the combustion chamber.
Preferably, the fuel fog beam sprayed by the main fuel sprayer is directed to the middle point of the annular bulge of the combustion chamber.
Preferably, the combustion chamber upper layer pits are symmetrically arranged along the central axis of the piston.
Preferably, the main injector is evenly distributed with a plurality of injection holes along the circumferential direction of the injection nozzle, the auxiliary injector is provided with a plurality of injection holes, and one injection hole of the main injector is opposite to one injection hole of the auxiliary injector.
Preferably, the number of the injection holes of the auxiliary injector is singular, and the injection holes of the auxiliary injector are symmetrically distributed with reference to the middle injection hole.
Preferably, the fuel mist of the secondary fuel injector is directed towards the center of the combustion chamber.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
1. the asymmetric combustion chamber system suitable for the high-power-density diesel engine is characterized in that the arc-shaped bulge part which is bulged inwards at the bottom of the combustion chamber is arranged, the central vertex of the arc-shaped convex part and the central axis of the cylinder are eccentrically arranged, the central vertex of the arc-shaped convex part is arranged on one side far away from the auxiliary fuel injector, so that the volume of a first recess of the combustion chamber on the side of the pilot injector is larger than the volume of a second recess on the side remote from the pilot injector, thereby the proportion of the air quantity at one side of the auxiliary fuel injector and one side far away from the auxiliary fuel injector in the combustion chamber can be adjusted to be matched with the characteristic that the fuel at one side of the auxiliary fuel injector in the combustion chamber system is more and the fuel at one side far away from the auxiliary fuel injector is less, therefore, the problems of non-uniform and non-symmetrical equivalence ratio distribution caused by non-uniform and non-symmetrical fuel distribution in a combustion chamber system are solved, and rapid combustion and higher per liter power index are realized.
2. The invention provides an asymmetric combustion chamber system suitable for a high-power-density diesel engine, wherein an inward combustion chamber annular bulge is arranged in the middle of the side wall of a combustion chamber, the combustion chamber annular bulge divides a combustion chamber pit into a combustion chamber upper pit and a combustion chamber lower pit, the combustion chamber lower pit is a main combustion generation area, the molded line of the combustion chamber lower pit is in a necking shape, and the turbulence intensity in the combustion chamber lower pit can be enhanced; the tail end of the fuel oil mist bundle of the main oil sprayer collides with the annular bulge of the combustion chamber to form two upward and downward swirling flows which respectively enter the upper pit and the lower pit of the combustion chamber, so that oil-gas mixing is promoted, the air utilization rate is improved, and the combustion effect under the condition of low air-fuel ratio is improved.
3. The invention provides an asymmetric combustion chamber system suitable for a high-power-density diesel engine, which comprises a main oil sprayer and an auxiliary oil sprayer, wherein the main oil sprayer is vertically arranged in the center of a cylinder cover, the auxiliary oil sprayer is obliquely arranged on the outer side of the cylinder cover, the two oil sprayers can spray oil simultaneously to increase the overall oil spraying rate, shorten the oil spraying duration, and effectively solve the problem that the single oil sprayer in the high-power-density diesel engine has insufficient oil spraying rate.
Drawings
FIG. 1 is a schematic structural diagram of an asymmetric combustion chamber system suitable for use in a high power density diesel engine according to the present invention;
FIG. 2 is a schematic diagram showing the matching relationship between the fuel spray beam of the main fuel injector and the annular bulge of the combustion chamber in the asymmetric combustion chamber system of the high power density diesel engine according to the present invention;
FIG. 3 is a cross-sectional view of an asymmetric combustion chamber configuration of the present invention for use in an asymmetric combustion chamber system for a high power density diesel engine;
FIG. 4 is a schematic contour line of an asymmetric combustion chamber region of an asymmetric combustion chamber system suitable for use in a high power density diesel engine according to the present invention;
FIG. 5 is a schematic diagram of the fuel spray distribution of the main fuel injector and the secondary fuel injector in an asymmetric combustion chamber system for a high power density diesel engine of the present invention;
the same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein: 1-a cylinder head; 2-main oil ejector; 3-auxiliary fuel injector; 4-fuel mist bundle of main fuel injector; 5-fuel mist bundle of the auxiliary fuel injector; 6-a combustion chamber; 7-a combustion chamber annular projection; 8-combustion chamber upper pit; 9-combustion chamber lower pit; 10-a first pit; 11-a second pit; 12-a cylinder; 13-piston.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1, the present invention provides an asymmetric combustion chamber system suitable for a high power density diesel engine, the asymmetric combustion chamber system includes a main oil injector 2, an auxiliary oil injector 3 and a combustion chamber 6, the main oil injector 2 is vertically installed in the center of a cylinder head 1, the auxiliary oil injector 3 is installed in an inclined manner outside the cylinder head 1, and the main oil injector 2 and the auxiliary oil injector 3 inject oil simultaneously to increase the overall oil injection rate, shorten the oil injection duration, and effectively solve the problem of insufficient single oil injector in the high power density diesel engine. Because the fuel fog beam 5 of the auxiliary fuel injector in the combustion chamber system is asymmetric about the central axis of the cylinder 12, the overall fuel distribution is also asymmetric, the fuel on one side of the auxiliary fuel injector 3 is more, and the fuel on the side far away from the auxiliary fuel injector 3 is less, so that the overall equivalence ratio distribution is uneven and asymmetric, and the combustion performance is influenced. Therefore, the invention provides an asymmetric combustion chamber design, an inward combustion chamber annular bulge 7 is arranged in the middle of the side wall of a combustion chamber 6, the tail end of a fuel spray beam 4 of a main fuel injector collides with the combustion chamber annular bulge 7 to form double swirl flow, the double swirl flow is fully mixed with air in the combustion chamber 6, and through proper asymmetric design, the proportion of air quantity at one side of a secondary fuel injector 3 and one side far away from the secondary fuel injector 3 is adjusted to be matched with the characteristic that fuel at one side of the secondary fuel injector 3 in a main combustion chamber system is more and fuel at one side far away from the secondary fuel injector 3 is less, so that the problems of non-uniform and asymmetric equivalence ratio distribution caused by non-uniform and asymmetric fuel distribution in the combustion chamber system are solved.
Specifically, as shown in fig. 1, in an embodiment of the present invention, the asymmetric combustion chamber system includes a main injector 2 and an auxiliary injector 3, where the main injector 2 and the auxiliary injector 3 are both disposed on the cylinder head 1, both inject directly in the cylinder, and share a combustion chamber 6.
Further, the main oil injector 2 is vertically installed on the cylinder head 1, a central axis of the main oil injector coincides with a central axis of the cylinder 12, the secondary oil injector 3 is installed on the cylinder head 1 in an inclined manner, the central axis of the secondary oil injector and the central axis of the cylinder 12 are on the same plane, an included angle between the central axis of the secondary oil injector 3 and the central axis of the cylinder 12 is α, an intersection point between the central axis of the secondary oil injector 3 and the bottom surface of the cylinder head 1 is a, a radial distance between the intersection point a and the central axis of the main oil injector 2 is L, and the included angle α and the radial distance L are specifically determined according to a target model.
As a preferred embodiment of the present invention, the reference values of the included angle α and the radial distance L are 25 ° and 36mm, respectively.
To explain further, as shown in fig. 3 and 5, the central axis of the main injector 2 and the central axis of the auxiliary injector 3 extend to form a plane S, the central axis of one injection hole of the main injector 2 is located on the plane S and points to the side of the auxiliary injector 3, the number of injection holes of the auxiliary injector 3 is generally singular, and the central axis of the middle injection hole is also located on the plane S, the injection holes of the auxiliary injector 3 are symmetrically arranged with reference to the middle injection hole; the main oil injector 2 bears main oil injection quantity, the auxiliary oil injector 3 plays a role in auxiliary oil injection, and fuel oil mist beams of the auxiliary oil injector 3 are mainly distributed in the first pit 10 on one side of the auxiliary oil injector 3, so that more fuel oil is injected on one side of the auxiliary oil injector 3, and less fuel oil is injected on the side far away from the auxiliary oil injector 3.
As a preferred embodiment of the present invention, the reference value of the number of the injection holes of the main injector 2 is 8, the reference value of the number of the injection holes of the auxiliary injector 3 is 3, and the reference values of the angles between the left and right injection holes of the auxiliary injector 3 and the middle injection hole thereof are 47 °.
As a further preferable embodiment of the present invention, a reference value of a ratio of an amount of fuel injected by the main injector 2 to an amount of fuel injected by the sub injector 3 is 8:2, and it is known that a ratio of an amount of fuel injected by the sub injector 3 to an amount of fuel injected by a side away from the sub injector 3 in the combustion chamber 6 is 3:2, and fuel distribution is uneven and asymmetric.
In order to solve the problems of non-uniform and non-symmetric equivalence ratio distribution caused by non-uniform and asymmetric fuel distribution, the embodiment of the invention provides an asymmetric combustion chamber structure, which comprises the following specific parts:
as shown in fig. 1-3, an inward combustion chamber annular protrusion 7 is arranged in the middle of the side wall of the combustion chamber 6, the combustion chamber annular protrusion 7 divides the combustion chamber 6 into a combustion chamber upper layer pit 8 and a combustion chamber lower layer pit 9, the combustion chamber annular protrusion 7 is an arc structure with a radius of r, and the arc structure is respectively connected with molded lines of the combustion chamber upper layer pit 8 and the combustion chamber lower layer pit 9 to play a role in transition; the pit 9 at the lower layer of the combustion chamber is a main area where combustion occurs, the molded line of the pit 9 at the lower layer of the combustion chamber is in a necking shape, so that the turbulence intensity in the pit 9 at the lower layer of the combustion chamber is enhanced, and mixing and combustion are promoted; the fuel spray beam 4 of the main oil sprayer points to the annular bulge 7 of the combustion chamber, namely the middle point of the circular arc structure, the tail end of the fuel spray beam 4 of the main oil sprayer collides with the annular bulge 7 of the combustion chamber to form two upward and downward plumes which respectively enter an upper pit 8 and a lower pit 9 of the combustion chamber in a wall surface jet flow movement mode, wherein the wall surface jet flow which enters the lower pit 9 of the combustion chamber downwards is dominant.
As a preferred embodiment of the invention, the radius of the circular arc structure r is 1 mm.
Further, as shown in fig. 3, the center apex of the arc-shaped convex portion of the combustion chamber 6 is O ', the center apex O' is not on the center axis of the cylinder 12, the center apex O 'is on the same plane as the center axis of the cylinder 12 and the center axis of the sub-injector 3, the center apex O' is located on the side away from the sub-injector 3, and is located at a distance S from the center axis of the cylinder 12, with the result that the volume of the first recess 10 of the combustion chamber 6 on the side of the sub-injector 3 is large, and the volume of the second recess 11 on the side away from the sub-injector 3 is small. Accordingly, the amount of air of the combustion chamber 6 on the side of the auxiliary fuel injector 3 is larger, and the proportion of the amount of air of the combustion chamber 6 on the side of the auxiliary fuel injector 3 and on the side far away from the auxiliary fuel injector 3 can be controlled by adjusting the magnitude of the eccentric distance S to be matched with the characteristics that the fuel on the side of the auxiliary fuel injector 3 is larger and the fuel on the side far away from the auxiliary fuel injector 3 is smaller in the combustion chamber system, so that the problems of non-uniform and non-symmetrical distribution of the equivalence ratio caused by non-uniform and non-symmetrical distribution of the fuel in the combustion chamber system are solved. After the central vertex O' of the arc-shaped convex part of the combustion chamber 6 is eccentrically arranged, the asymmetric surface of the combustion chamber 6 needs to be continuously and smoothly transited, and the contour line schematic diagram of the asymmetric surface is shown in fig. 4.
As a preferred embodiment of the present invention, the reference value of the eccentric distance S is 1.6mm, and at this time, the ratio of the average equivalent ratio of the side of the sub-injector 3 to the side away from the sub-injector 3 in the combustion chamber 6 is 1.015: 1.
Further, as shown in fig. 3, a symmetrical combustion chamber is shown by a broken line in fig. 3, in which a center apex O is located on the central axis of the cylinder 12, and an asymmetrical combustion chamber is shown by a solid line in fig. 3, in which a center apex O 'of an arc-shaped protrusion is not located on the central axis of the cylinder 12, and the distance between the center apex O and the center apex O' is S, it can be seen that, compared with the symmetrical combustion chamber, the volume of the first recess 10 of the asymmetrical combustion chamber on the side of the sub-injector 3 is larger, and the volume of the second recess 11 on the side away from the sub-injector 3 is smaller.
In further detail, as shown in fig. 3 and 4, the shape of a-a' -D is a truncated cone; the horizontal section of the point A (A') is a top plane and the center of the circle is OA，OAIs on the same vertical line with O' and is parallel to the central axis of the cylinder 12; the horizontal section of the point D (D') is a base plane and the center of the circle is OD，ODOn the same vertical line with the O, and is superposed with the central axis of the cylinder 12; the center of a horizontal section of the oblique truncated cone A-A '-D' -D at any height (such as O shown in FIG. 3)B，OC) Are all located at OA-ODOn a straight line as shown.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The utility model provides an asymmetric combustion chamber system suitable for high power density diesel engine, includes combustion chamber (6) of setting in piston (13), vertically sets up in main sprayer (2) of cylinder head (1) center and slope set up in vice sprayer (3) of cylinder head (1), its characterized in that:
the bottom of the combustion chamber (6) protrudes inwards to form an arc-shaped protruding part;
the center vertex of the arc-shaped convex part is eccentrically arranged with the central axis of the cylinder (12), and the center vertex of the arc-shaped convex part is arranged on one side far away from the secondary fuel injector (3), so that the volume of a first pit (10) of the combustion chamber (6) on one side of the secondary fuel injector (3) is larger than the volume of a second pit (11) on one side far away from the secondary fuel injector (3).
2. The asymmetric combustion chamber system suitable for the high-power-density diesel engine is characterized in that the middle part of the side wall of the combustion chamber (6) is provided with an inward combustion chamber annular bulge (7) to divide the combustion chamber (6) into a combustion chamber upper layer pit (8) and a combustion chamber lower layer pit (9);
the fuel spray beam sprayed by the main fuel sprayer (2) points to the annular bulge (7) of the combustion chamber, the tail end of the fuel spray beam (4) of the main fuel sprayer collides with the annular bulge (7) of the combustion chamber, is divided into two upward and downward plumes, and respectively enters the upper-layer pit (8) and the lower-layer pit (9) of the combustion chamber in a wall surface jet flow mode.
3. The asymmetric combustion chamber system suitable for the high-power-density diesel engine as claimed in claim 2, characterized in that the profile of the lower combustion chamber pit (9) is in a shape of a necking to enhance the intensity of the swirl flow entering the lower combustion chamber pit (9), so that the swirl flow entering the lower combustion chamber pit (9) is larger than the swirl flow entering the upper combustion chamber pit (8) to promote the air-fuel mixture.
4. The asymmetric combustion chamber system suitable for the high-power-density diesel engine is characterized in that the combustion chamber annular bulge (7) is of a circular arc structure, and the circular arc structure is connected with the molded lines of the combustion chamber upper-layer pit (8) and the combustion chamber lower-layer pit (9) respectively.
5. The asymmetric combustion chamber system suitable for a high power density diesel engine as claimed in claim 4 characterized in that the fuel mist jet (4) of the main fuel injector is directed towards the middle point of the combustion chamber annular bulge (7).
6. The asymmetric combustion chamber system suitable for a high power density diesel engine as claimed in any one of claims 1-5, characterized in that said combustion chamber upper dimples (8) are symmetrically arranged along the central axis of said piston (13).
7. The asymmetric combustion chamber system suitable for the high-power-density diesel engine is characterized in that a plurality of oil injection holes are uniformly distributed on the main oil injector (2) along the circumferential direction of an oil injection nozzle of the main oil injector, a plurality of oil injection holes are formed in the auxiliary oil injector (3), and one oil injection hole of the main oil injector (2) is opposite to one oil injection hole of the auxiliary oil injector (3).
8. The asymmetric combustion chamber system suitable for the high power density diesel engine as recited in claim 7, characterized in that the number of the injection holes of the auxiliary injector (3) is singular, and the injection holes of the auxiliary injector (3) are symmetrically distributed with reference to the middle injection hole thereof.
9. An asymmetric combustion chamber system for a high power density diesel engine according to claim 8 characterized in that the fuel mist jet (5) of the secondary fuel injector is directed towards the centre of the combustion chamber (6).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114165352A (en) * | 2021-12-17 | 2022-03-11 | 中国船舶重工集团公司第七一一研究所 | Piston, combustion chamber assembly and method of organizing combustion |
| CN114233544A (en) * | 2022-02-25 | 2022-03-25 | 潍柴动力股份有限公司 | Engine double-main-jet device and calibration method for engine cold start process |
| CN114251210A (en) * | 2022-03-01 | 2022-03-29 | 潍柴动力股份有限公司 | Oil injection device and parameter calibration method thereof |
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| CN114251210B (en) * | 2022-03-01 | 2022-06-24 | 潍柴动力股份有限公司 | Parameter calibration method of oil injection device |
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