CN115163289A - Swirl spray tumble combustion system of opposed-piston compression ignition engine - Google Patents
Swirl spray tumble combustion system of opposed-piston compression ignition engine Download PDFInfo
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- CN115163289A CN115163289A CN202210654832.XA CN202210654832A CN115163289A CN 115163289 A CN115163289 A CN 115163289A CN 202210654832 A CN202210654832 A CN 202210654832A CN 115163289 A CN115163289 A CN 115163289A
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- Prior art keywords
- opposed
- swirl
- combustion
- chamber
- ignition engine
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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
- F02B23/0618—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 having in-cylinder means to influence the charge motion
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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
- F02B23/0675—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 the combustion space being substantially spherical, hemispherical, ellipsoid or parabolic
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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
- F02B75/00—Other engines
- F02B75/28—Engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/26—Pistons having combustion chamber in piston head
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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)
Abstract
The invention provides a swirl spray tumble combustion system of an opposed piston compression ignition engine, which comprises opposed pistons, an oil sprayer, a combustion chamber, a cylinder sleeve, swirl chambers and guide screens, wherein the opposed pistons are arranged in the cylinder sleeve, the combustion chamber is formed in the middle of the opposed pistons, the swirl chambers are symmetrically arranged on two sides of the cylinder sleeve, each swirl chamber is communicated with one guide screen, and the oil sprayer is arranged in each swirl chamber. The swirl spray tumble combustion system of the opposed piston compression ignition engine disclosed by the invention has the advantages that the structural characteristics of the asymmetric semi-willow leaf combustion chamber of the opposed piston are utilized near the top dead center, and the swirl motion is formed in a cylinder under the action of the spray jet flow at the outlet of the guide screen, so that the oil-gas mixing is accelerated, the ignition stagnation period and the combustion duration are shortened, and the combustion efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of opposed piston compression ignition engines, and particularly relates to a swirl spray tumble combustion system of an opposed piston compression ignition engine.
Background
Compared with the traditional reciprocating piston engine, the opposed piston engine has the characteristics of compact structure, high working frequency and good dynamic balance because a cylinder cover and a valve mechanism are cancelled. However, because the air exchange process is realized through the air inlet and outlet ports on the cylinder sleeve, the air exchange is organized in a spiral motion mode, the waste gas is difficult to be quickly discharged, and in order to ensure the air exchange efficiency, the air supply ratio is generally required to be improved, and the exhaust opening phase is required to be increased. Meanwhile, the fuel injector is usually arranged on the side because the opposed piston compression ignition engine has a compact structure. The fuel is laterally sprayed into the cylinder, so that the distance from the outlet of the fuel injector to a wall collision point is short, the atomization of a spray space is insufficient, and the mixed gas is formed by a wall collision secondary crushing mode generally, so that the wall wetting amount of the fuel is increased. In addition, advancing the exhaust opening phase results in further compression of the time of the in-cylinder mixture formation and combustion process. Combining the above factors, such engines often suffer from low combustion efficiency and insufficient combustion due to uneven mixing. Therefore, the spraying quality is improved, the flow field structure in the cylinder is optimized, and the formation and combustion characteristics of the mixed gas of the opposed piston compression ignition engine can be fundamentally improved. The common optimization mode mostly focuses on the arrangement mode of air inlets and air outlets, enhances the vortex motion by changing the radial inclination angle of the air inlets, but has limited effect on the spray combustion process.
Disclosure of Invention
In view of this, the present invention provides a swirl spray tumble combustion system for an opposed-piston compression-ignition engine to solve the problem of low combustion efficiency of the engine.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a swirl spray tumble combustion system of an opposed piston compression ignition engine comprises opposed pistons, an oil injector, a combustion chamber, a cylinder sleeve, swirl chambers and guide screens, wherein the opposed pistons are arranged in the cylinder sleeve, the combustion chamber is formed in the middle of the opposed pistons, the swirl chambers are symmetrically arranged on two sides of the cylinder sleeve, each swirl chamber is communicated with one guide screen, the tangential direction of an outlet of each guide screen is matched with the shape of the combustion chamber, and the oil injector is arranged in each swirl chamber.
Further, the shape of the swirling chamber is approximately spherical and is located near the top dead center of the engine.
Furthermore, the guide screen is in a gradually-reduced streamline shape from the inlet to the outlet.
Furthermore, the combustion chamber is of a semi-willow leaf type.
Further, the opposed pistons are of an asymmetric structure and are arranged oppositely.
Furthermore, near the top dead center of the engine, the semi-willow-leaf type combustion chambers on two sides form an elliptical combustion chamber.
Compared with the prior art, the swirl spray tumble combustion system of the opposed-piston compression-ignition engine has the following advantages:
(1) The swirl spray tumble combustion system of the opposed piston compression ignition engine disclosed by the invention has the advantages that the structural characteristics of the asymmetric semi-willow leaf combustion chamber of the opposed piston are utilized near the top dead center, and the swirl motion is formed in a cylinder under the action of the spray jet flow at the outlet of the guide screen, so that the oil-gas mixing is accelerated, the ignition stagnation period and the combustion duration are shortened, and the combustion efficiency is improved.
(2) The swirl spray tumble combustion system of the opposed piston compression ignition engine provided by the invention has the advantages that the swirl motion is formed in the combustion process through the asymmetric half-willow-leaf combustion chamber structure of the opposed piston, the exhaust gas is favorably discharged in the exhaust process, and the scavenging efficiency of the engine is improved.
(3) According to the swirl spray tumble combustion system of the opposed piston compression ignition engine, the phase difference existing at the top dead center of the opposed piston is matched with the outlet position of the guide screen, so that the compression ratio can be rapidly improved near the top dead center, the combustion isochoricity is further improved, and the combustion efficiency is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation of the invention. In the drawings:
FIG. 1 is a schematic diagram of an opposed-piston compression-ignition engine swirl spray tumble combustion system according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of the flow of working medium in the swirl spray tumble combustion system of the swirl chamber in the compression process according to the embodiment of the present invention;
FIG. 3 is a schematic diagram of the flow of the working fluid of the swirling spray tumble combustion system in the combustion process according to the embodiment of the present invention;
fig. 4 is a schematic structural diagram of a near top dead center swirl spray tumble combustion system according to an embodiment of the present invention.
Description of reference numerals:
1-opposed pistons; 2-an oil injector; 3-fuel oil spraying; 4-a combustion chamber; 5-cylinder liner; 6-a swirl chamber; 7-a guide screen; 8-compression process working medium flow line; 9-working medium flow line on the upper side of the combustion process; 10-working medium flow line at lower side of combustion process; 11-directed to the screen outlet.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The utility model provides an opposition piston compression ignition engine whirl spraying tumble combustion system, as shown in fig. 1-4, including opposition piston 1, sprayer 2, combustion chamber 4, cylinder liner 5, swirl chamber 6 and direction screen 7, 5 internally mounted opposition pistons 1 of cylinder liner, opposition piston 1 is middle to form combustion chamber 4, 5 bilateral symmetry installations swirl chamber 6 of cylinder liner, every swirl chamber 6 and a direction screen 7 intercommunication, sprayer 2 of 6 internally mounted of every swirl chamber.
The oil sprayer 2 is installed in the swirling flow chamber 6, and fuel oil spray is accelerated to evaporate under the strong swirling mass entrainment effect in the swirling flow chamber 6. The cyclone chamber 6 is approximately spherical in shape and is positioned near the top dead center of the engine.
The guide screen 7 is in a gradually-reduced streamline shape from the inlet to the outlet. The fuel vapor is gradually reduced by the flow area of the guide screen 7, and the spray forms jet flow at the outlet 11 of the guide screen and enters the cylinder sleeve 5. The tangential direction of the outlet 11 of the guide screen 7 matches the shape of the combustion chamber 4.
The combustion chambers 4 on each side are of a semi-willow leaf type; the opposed pistons 1 are in an asymmetric structure and are arranged oppositely. Near the top dead center of the engine, the semi-willow leaf type combustion chambers 4 on two sides form a large combustion chamber similar to an ellipse, and by utilizing the structural characteristics of the asymmetric semi-willow leaf type combustion chambers 4 of the opposed pistons 1 and combining the spray jet action of the guide screen outlet 11, tumble motion is formed in a cylinder, oil-gas mixing is accelerated, the ignition combustion delay period and the combustion duration are shortened, and the combustion efficiency is improved.
The asymmetric semi-willow leaf combustion chamber 4 structure of the opposed piston 1 can form tumble motion in the combustion process, exhaust gas can be discharged in the exhaust process, and scavenging efficiency of the engine is improved. If the phase difference exists between the upper dead centers of the opposite pistons, the compression ratio can be quickly improved near the upper dead center by matching with the position of the guide screen outlet 11, so that the combustion isochoricity is further improved, and the combustion efficiency is improved.
The operating principle of the swirl spray tumble combustion system of the opposed-piston compression-ignition engine is as follows:
1. in the compression process of the engine, as shown in fig. 2, the working medium enters the cyclone chamber 6 under the negative pressure action of the guide screen 7 to form cyclone motion in the cavity of the cyclone chamber 6.
2. The oil injection starts, and as shown in figure 1, the fuel spray 3 is accelerated to evaporate under the entrainment action of a strong vortex group in the cyclone chamber 6; the fuel vapor is gradually reduced by the flow area of the guide screen 7, and the spray forms jet flow at the guide screen outlet 11 and enters the cylinder.
As shown in figure 3, by utilizing the structural characteristics of the combustion chambers 4 of the opposed pistons 1, the semi-willow-leaf combustion chambers 4 on two sides form an oval-like combustion chamber, and tumble motion is formed in the cylinder under the action of spray jet of the guide screen outlet 11, so that oil-gas mixing is accelerated.
3. The top dead center of the opposed piston 1 has a phase difference, near the top dead center, as shown in fig. 4, the guide screen outlet 11 is shielded by the lower opposed piston 1, the swirl chamber 6 is isolated from the cylinder, the working volume is rapidly reduced, the compression ratio is rapidly improved, the combustion isochoricity is further improved, and the combustion efficiency is improved.
4. The opposed piston 1 further descends to the exhaust port position, the exhaust process starts, and tumble motion formed in the combustion process is beneficial to exhaust of waste gas, so that the scavenging efficiency of the engine is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. An opposed piston compression ignition engine whirl spraying tumble combustion system which characterized in that: the fuel injector comprises opposed pistons, a fuel injector, a combustion chamber, a cylinder sleeve, swirl chambers and a guide screen, wherein the opposed pistons are arranged in the cylinder sleeve, the combustion chamber is formed in the middle of the opposed pistons, the swirl chambers are symmetrically arranged on two sides of the cylinder sleeve, each swirl chamber is communicated with one guide screen, the tangential direction of an outlet of each guide screen is matched with the shape of the combustion chamber, and the fuel injector is arranged in each swirl chamber.
2. An opposed-piston compression-ignition engine swirl spray tumble combustion system according to claim 1, characterized in that: the shape of the swirling chamber is approximately spherical and is positioned near the top dead center of the engine.
3. An opposed-piston compression-ignition engine swirl spray tumble combustion system according to claim 1, characterized in that: the guide screen is in a gradually-reduced streamline shape from the inlet to the outlet.
4. An opposed-piston compression-ignition engine swirl spray tumble combustion system according to claim 1, characterized in that: the combustion chamber is of a semi-willow leaf type.
5. An opposed-piston compression-ignition engine swirl spray tumble combustion system according to claim 1, characterized in that: the opposed pistons are in an asymmetric structure and are oppositely arranged.
6. An opposed-piston compression-ignition engine swirl spray tumble combustion system according to claim 4, characterized in that: near the top dead center of the engine, the semi-willowleaf combustion chambers on two sides form an ellipse-like combustion chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210654832.XA CN115163289A (en) | 2022-06-10 | 2022-06-10 | Swirl spray tumble combustion system of opposed-piston compression ignition engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210654832.XA CN115163289A (en) | 2022-06-10 | 2022-06-10 | Swirl spray tumble combustion system of opposed-piston compression ignition engine |
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| Publication Number | Publication Date |
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| CN115163289A true CN115163289A (en) | 2022-10-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210654832.XA Pending CN115163289A (en) | 2022-06-10 | 2022-06-10 | Swirl spray tumble combustion system of opposed-piston compression ignition engine |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102900521A (en) * | 2011-07-26 | 2013-01-30 | 艾克莫特国际公司 | Tumble-flow accelerating combustion chamber |
| US20130036999A1 (en) * | 2011-08-08 | 2013-02-14 | Ecomotors International, Inc. | High-Squish Combustion Chamber With Side Injection |
| CN103168148A (en) * | 2010-08-16 | 2013-06-19 | 阿凯提兹动力公司 | Fuel injection spray patterns for opposed-piston engines |
| CN104018939A (en) * | 2013-03-01 | 2014-09-03 | 优华劳斯汽车系统（上海）有限公司 | Engine with oppositely-arranged pistons and oppositely-arranged cylinders |
| US20150300241A1 (en) * | 2014-02-04 | 2015-10-22 | Ronald A. Holland | Opposed Piston Engine |
-
2022
- 2022-06-10 CN CN202210654832.XA patent/CN115163289A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103168148A (en) * | 2010-08-16 | 2013-06-19 | 阿凯提兹动力公司 | Fuel injection spray patterns for opposed-piston engines |
| CN102900521A (en) * | 2011-07-26 | 2013-01-30 | 艾克莫特国际公司 | Tumble-flow accelerating combustion chamber |
| US20130036999A1 (en) * | 2011-08-08 | 2013-02-14 | Ecomotors International, Inc. | High-Squish Combustion Chamber With Side Injection |
| CN104018939A (en) * | 2013-03-01 | 2014-09-03 | 优华劳斯汽车系统（上海）有限公司 | Engine with oppositely-arranged pistons and oppositely-arranged cylinders |
| US20150300241A1 (en) * | 2014-02-04 | 2015-10-22 | Ronald A. Holland | Opposed Piston Engine |
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