CN115405409A - Combustion chamber and gas engine - Google Patents
Combustion chamber and gas engine Download PDFInfo
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- CN115405409A CN115405409A CN202211143440.3A CN202211143440A CN115405409A CN 115405409 A CN115405409 A CN 115405409A CN 202211143440 A CN202211143440 A CN 202211143440A CN 115405409 A CN115405409 A CN 115405409A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 102
- 238000007906 compression Methods 0.000 claims abstract description 29
- 230000006835 compression Effects 0.000 claims abstract description 26
- 239000007789 gas Substances 0.000 description 33
- 230000009286 beneficial effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000009795 derivation Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000002407 reforming Methods 0.000 description 2
- 241001270131 Agaricus moelleri Species 0.000 description 1
- 102000001999 Transcription Factor Pit-1 Human genes 0.000 description 1
- 108010040742 Transcription Factor Pit-1 Proteins 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
Images
Classifications
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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
- F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
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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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- 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
- F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
- F02B23/10—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder
- F02B2023/102—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder the spark plug being placed offset the cylinder centre axis
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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
- F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
- F02B23/10—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder
- F02B2023/106—Tumble flow, i.e. the axis of rotation of the main charge flow motion is horizontal
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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
- F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
- F02B23/10—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder
- F02B2023/108—Swirl flow, i.e. the axis of rotation of the main charge flow motion is vertical
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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 discloses a combustion chamber and a gas engine, which are used for the gas engine reformed by a diesel engine, the combustion chamber is combined with a weak tumble cylinder cover structure for use, the combustion chamber comprises a combustion chamber pit positioned at the top of a piston and a combustion chamber upper area surrounded by a cylinder cover bottom plane and a cylinder sleeve, and the bottom of the combustion chamber pit comprises a rotary central bulge protruding upwards and a circumferential annular pit surrounding the central bulge. According to the invention, the combustion chamber pit is designed into an omega-shaped structure, so that the tumble strength in the combustion chamber is enhanced, the annular pit is used for fully utilizing vortex energy, and the distribution of turbulent kinetic energy is changed in the compression stage, so that the turbulent kinetic energy is distributed on two sides of the central bulge part, and the strength of the turbulent kinetic energy can be improved. The invention accelerates the post-combustion rate of the mixed gas, improves the combustion process and reduces the heat load by increasing the compression clearance. Meanwhile, the two spark plugs are arranged in the combustion chamber, so that the flame propagation rate is increased, and the heat efficiency is improved.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a combustion chamber and a gas engine.
Background
At present, the design and development of a heavy natural gas engine are generally improved on the basis of a diesel engine, and for the diesel engine, the vortex generated by a swirl air passage is helpful for mixing oil bundles and air to a certain extent, so that high-efficiency combustion and low pollutant emission are realized. The gas engine is premixed combustion, fuel is mixed with air in the air intake process, and after a spark plug is ignited to generate a fire core, the ideal state is that high turbulent kinetic energy exists in a cylinder in the combustion process. The increase of the turbulent kinetic energy can accelerate the flame propagation speed, which is significant for improving the combustion process of the gas engine and reducing the cycle variation. If large-size flow such as vortex continues to exist in the gas engine, the flow velocity near the spark plug is low at the end of compression, the longitudinal flow velocity is also low, the vortex cannot be broken into small-size turbulence, the turbulent kinetic energy is low, and therefore, the large-size vortex motion is not favorable for premixed combustion of the gas engine and the cyclic variation is large. For a gas engine, the turbulent kinetic energy can be improved by properly improving the tumble strength of the mixed gas, so that the combustion characteristic of the gas is improved. Wherein, the vortex is the organized large-scale rotational flow motion of the gas around the central axis of the cylinder; the tumble refers to large-scale rotational flow movement of airflow around an axis vertical to the central axis of the cylinder; in addition, turbulent flow is different from laminar flow, and refers to a small-scale rotational flow which is generated in many directions and is not fixed when the airflow speed is high.
Due to the middle air inlet mode and casting deviation of the diesel engine, the consistency of the swirl ratio is poor, and the consistency of each cylinder is poor. On the premise that a valve rod of a diesel engine cannot be inclined, a roof-type combustion chamber similar to a gasoline engine cannot be achieved, so that tumble strength is low, a straight piston is usually adopted by a gas engine to match with tumble, the combustion speed of the current gas engine is still low, the piston needs to be further optimized, the tumble degree is enhanced, the flame propagation speed is increased, and the heat efficiency of the engine is improved.
The existing gas engine piston is generally formed by reforming a diesel engine piston, a combustion chamber 01 of the piston mostly adopts a straight-opening basin-shaped structure, as shown in figure 1, the flame development form can be influenced due to the large-scale eddy motion, the circular change is high, in addition, the height of the top of the piston is the same, the squeezing flow intensity generated on two sides of an inlet valve and an exhaust valve is similar, the speed near a spark plug 03 is low, the turbulent kinetic energy is low and unreasonable in distribution, and the flame propagation speed at the initial stage of ignition is low. As shown in fig. 1, a dashed-line frame region located near the ignition plug 03 is a flame propagation low-speed region 02. At the same time, the lower flame propagation speed on the exhaust valve side increases the tendency to knock. Wherein squish flow refers to longitudinal and lateral air flow movement that occurs when a portion of the piston surface and the cylinder head are brought into proximity with each other; the detonation means that after the gas in the combustion chamber is ignited, flame waves are not completely diffused, the far unburned gas is self-ignited due to high temperature or high pressure, and the flame waves collide with the flame waves of normal combustion to generate great pressure, so that abnormal knocking sound is generated by the engine. The transverse direction as referred to herein means a direction along the radial direction of the cylinder, and the longitudinal direction means a direction along the axial direction of the cylinder.
Therefore, how to optimize the gas engine combustor to improve the gas combustion process is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention is directed to a combustion chamber and a gas engine, and the present invention is advantageous to form tumble in a cylinder by optimizing a structure of the combustion chamber and combining with an existing weak tumble air passage, and can change distribution of turbulent kinetic energy, thereby improving flame propagation speed and thermal efficiency.
In order to achieve the purpose, the invention provides the following technical scheme:
a combustion chamber is used for a gas engine reformed by a diesel engine, and is combined with a weak tumble cylinder cover structure for use, the combustion chamber comprises a combustion chamber pit positioned at the top of a piston and a combustion chamber upper area surrounded by a cylinder cover bottom plane and a cylinder sleeve, the bottom of the combustion chamber pit comprises an upward-convex rotary central convex part and a circumferential annular pit surrounding the central convex part, two spark plugs are arranged on the cylinder cover bottom plane and are respectively positioned on two sides of the central convex part and positioned above the annular pit, the surface of the central convex part is an upward-convex smooth curved surface, the surface of the annular pit is a downward-concave smooth curved surface extending from the periphery of the central convex part to the side wall of the combustion chamber pit, the distance between the bottom of the annular pit and the top surface of the piston is 0.15-0.3 times of the diameter of the piston, the distance between the top of the central convex part and the top surface of the piston is 5-7 mm, and the compression clearance of the combustion chamber is 0.05-0.2 times of the radius of the piston.
Preferably, any plane passing through the axis of the piston is a longitudinal central plane of the piston, an intersection line of the combustion chamber pit and the longitudinal central plane of the piston is a combustion chamber pit molded line, the combustion chamber pit molded line comprises a central bulge molded line and two sections of annular pit molded lines respectively connected with two ends of the central bulge molded line, and the annular pit molded lines are smoothly connected with the central bulge molded line.
Preferably, the molded line of the central convex part is a circular arc line, and/or the molded line of the annular concave pit is a circular arc line.
Preferably, the radius of the central convex part profile is 0.8 to 2 times the diameter of the piston, and/or the radius of the annular concave pit profile is 0.3 to 0.6 times the diameter of the piston.
Preferably, the combustion chamber dimple profile is symmetrically disposed about the axis of the piston.
Preferably, the diameter of the upper edge of the combustion chamber recess is 0.6 to 0.9 times the diameter of the piston.
Preferably, the two spark plugs are symmetrically distributed on two sides of the central bulge part.
Preferably, the bottom plane of the cylinder cover is provided with two air inlet throats and two exhaust throats, and one spark plug is arranged between the two air inlet throats and between the two exhaust throats respectively.
Preferably, the spark plug is located directly above the lowest depression of the annular recess.
According to the invention, the combustion chamber pit is designed into an omega-shaped structure, so that the tumble strength in the combustion chamber can be enhanced, the annular pit can be utilized to fully utilize the vortex energy, the distribution of the turbulent kinetic energy is changed in the compression stage, the turbulent kinetic energy is distributed on two sides of the central bulge, and the strength of the turbulent kinetic energy can be improved. The invention accelerates the post-combustion rate of the mixed gas, improves the combustion process and reduces the heat load by increasing the compression clearance. Meanwhile, the two spark plugs are arranged in the combustion chamber, so that the flame propagation rate is increased, and the heat efficiency is improved.
The invention also provides a gas engine comprising any one of the combustion chambers described above. The derivation process of the beneficial effect of the gas engine is substantially similar to the derivation process of the beneficial effect of the combustion chamber, and therefore, the description is omitted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a straight-mouth bowl-shaped combustion chamber in the prior art;
FIG. 2 is a schematic view of a combustor in an embodiment of the present invention;
FIG. 3 is a graph of the change in-cylinder tumble strength of a prior art combustion chamber and a calibration point of the combustion chamber of the present invention;
FIG. 4 is a plot of the in-cylinder swirl intensity of a calibrated point for a prior art combustor and a combustor of the present invention;
FIG. 5 is a plot of the heat release rate versus a calibrated point for a prior art combustor and a combustor of the present invention;
FIG. 6 is a schematic view of a cross-sectional location of a combustion chamber in accordance with an embodiment of the present invention;
FIG. 7 is a schematic illustration of the in-cylinder gas velocity field of the prior art and the present invention at the start of compression;
FIG. 8 is a schematic illustration of the in-cylinder gas velocity field of the prior art and the present invention during compression;
FIG. 9 is a schematic illustration of an in-cylinder gas velocity field of the prior art and the present invention at the time of ignition;
FIG. 10 is a schematic illustration of the distribution of turbulence energy within a combustion chamber of the prior art and the present invention.
In the figure:
1 is a spark plug; 2 is a combustion chamber pit; 3 is the upper top surface of the piston; 4 is an annular pit; 5 is a piston; and 6 is a central boss.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2 to 10, the present invention provides a combustion chamber for a gas engine reformed from a diesel engine, wherein the combustion chamber is used in combination with a weak tumble cylinder head structure, and the weak tumble cylinder head structure refers to a cylinder head described in the invention patent ("a weak tumble rapid combustion system and a gas engine", publication No. CN111287860a "), the cylinder head structure is formed by reforming a cylinder head of the diesel engine, and a top surface of the formed combustion chamber is a flat-top structure, that is, a valve stem of the cylinder head is arranged along an axial direction of a piston, an air inlet channel of the cylinder head is a weak tumble air channel, specifically, the air inlet channel of the cylinder head can enable an intake air flow to generate a large-scale weak tumble motion in the cylinder, and specific design features of the weak tumble structure are not repeated herein. This combustion chamber is including the combustion chamber pit that is located the top of piston and the combustion chamber upper portion region that is surrounded by cylinder cap baseplane and cylinder liner, the bottom of combustion chamber pit is including the central convex part 6 of upwards bellied gyration shape and the annular pit 4 of circumference that encircles central convex part, the cylinder cap baseplane is equipped with two spark plugs, two spark plugs are located the both sides of central convex part 6 respectively and all are located the top of annular pit 4, the surface of central convex part 6 is the bellied rounding off face that makes progress, the surface of annular pit 4 is the rounding off face that extends and undercut to the lateral wall of combustion chamber pit by the periphery of central convex part 6, the bottom of annular pit 4 and the top surface region on the pistonDistance H of 1 Is the diameter D of the piston 1 0.15 to 0.3 times of the distance H between the top of the central boss 6 and the upper top surface of the piston 2 5-7 mm, and the compression clearance of the combustion chamber is 0.05-0.2 times of the radius of the piston.
It should be noted that the upper top surface of the piston is a planar structure, so that the extrusion flow strength around the piston can be ensured to be consistent in the compression process of the piston.
Compared with the prior art, the piston top surface of the combustion chamber provided by the embodiment of the invention is designed with the omega-shaped pit, so that more gas can enter the combustion chamber pit with better streamline form, further the tumble strength is increased, the annular pit 4 can be utilized to fully utilize vortex energy, the distribution of turbulent kinetic energy is changed in the compression stage, the turbulent kinetic energy is distributed on two sides of the central bulge part 5, and the strength of the turbulent kinetic energy can be improved. Meanwhile, the invention overcomes the design concept of using small compression clearance of diesel engine in the existing design, finds that the too small compression clearance can cause the quenching effect of flame in the compression clearance of the gas engine, and based on the fact that the compression clearance is not harmful volume when the diesel engine is changed into the gas engine, adopts a new design concept that the compression clearance is properly increased to be beneficial to combustion, and increases the airflow speed in the compression clearance by increasing the compression clearance, so that the airflow speed in the compression clearance can still be affected by the tumble action, the post-combustion speed of mixed gas is accelerated, the combustion process is improved, and the heat load is reduced. Meanwhile, the two spark plugs 1 are arranged in the combustion chamber, so that the flame propagation rate is increased, and the heat efficiency is improved.
It should be noted that, in the embodiment of the present invention, any plane passing through the axis of the piston is a longitudinal central plane of the piston, an intersection line of the combustion chamber annular recess 4 and the longitudinal central plane of the piston is a combustion chamber recess molded line, the combustion chamber recess molded line includes a central convex portion molded line and two sections of annular recess molded lines respectively connected to two ends of the central convex portion molded line, and the annular recess molded line is smoothly connected to the central convex portion molded line.
The central convex part molded line may be an arc line, an elliptical arc line, or a combination of an arc line and an elliptical arc line, and/or the annular concave pit molded line may be an arc line, an elliptical arc line, or a combination of an arc line and an elliptical arc line.
Further, as shown in FIG. 2, the radius R of the center lobe profile 2 Is the diameter D of the piston 1 0.8 to 2 times of (i.e. R) 2 ＝(0.8～2)D 1 And/or the radius R of the annular dimple profile 1 Is the diameter D of the piston 1 0.3 to 0.6 times of (i.e. R) 1 ＝(0.3～0.6)D 1 So set up, can guarantee that the whole of combustion chamber pit 2 is the better shallow basin shape pit structure of streamlined, can make the air current in the combustion chamber form the tumble more easily.
Further optimizing the technical scheme, in the embodiment of the invention, the pit-shaped line of the combustion chamber is symmetrically arranged relative to the axis of the piston, namely the curvature center of the pit-shaped line of the combustion chamber is positioned on the axis of the piston. Of course, the curvature center of the combustion chamber pit profile can also be designed to be at a certain distance from the piston axis.
Preferably, the diameter D of the upper edge of the combustion chamber pocket 2 Is the diameter D of the piston 1 0.6 to 0.9 times the diameter D of the upper edge of the combustion chamber recess 2 ＝(0.6～0.9)D 1 。
As shown in fig. 2, in the embodiment of the present invention, two spark plugs 1 are symmetrically arranged on both sides of the center boss portion 6. Further, as shown in fig. 2, the spark plug 1 is located directly above the lowest recess of the annular recess 4.
In the embodiment of the invention, two air inlet throats and two exhaust throats are arranged on the bottom plane of the cylinder cover, and the spark plugs 1 are respectively arranged between the two air inlet throats and between the two exhaust throats.
Referring to fig. 3 to 5, in the later stage of the intake stroke and the earlier stage of the compression stroke, the tumble flow of the scheme is strengthened, and in the later stage of the compression stroke, the tumble flow is broken, the tumble ratio is sharply reduced, and the tumble ratio is approximately consistent with that of the original piston. In the air inlet stage and the early stage of the compression stroke, the swirl ratio of the new scheme is slightly higher than that of the original piston, and the swirl ratio of the new scheme is smaller than that of the original piston in the later stage of the compression stroke. As can be seen from fig. 5, the combustion speed of the present invention is remarkably increased.
Referring to fig. 7 to 10, in the velocity field at the start of compression (180 degrees before the compression point), the cylinder of the original scheme has no obvious large scale in the middle, and the new scheme has obvious tumble motion in the middle of the cylinder, which is important for maintaining the intake energy. In the compression process (100 degrees before the compression point), in the early and middle stages of the compression process, the tumble center of the new scheme is relatively closer to the cylinder cover, and the overall tumble radius is larger. The turbulence energy and the flow field distribution at the moment of ignition (23 degrees) are distributed, and the original scheme is that the extrusion flow intensity of the two sides of the air inlet valve and the air outlet valve is the same, the extrusion flow of the two sides flows into the piston pit, and obvious tumble flow is generated at the bottom of the pit, so that the turbulence energy at the bottom of the pit is larger, and the turbulence energy near a spark plug is lower. The new scheme is that the middle of the combustion chamber is convex, so that the extruded flow flows to the centers of the two pits respectively and meets at the centers of the two pits respectively to form higher turbulent kinetic energy, and the two spark plugs are arranged above the centers of the two pits respectively, so that the turbulent kinetic energy near the spark plugs is larger, and the rapid propagation of flame is facilitated.
The invention also provides a gas engine comprising any one of the combustion chambers described above. The derivation process of the beneficial effect of the gas engine is substantially similar to the derivation process of the beneficial effect of the combustion chamber, and therefore, the description is omitted.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A combustion chamber is used for a gas engine reformed by a diesel engine and is combined with a weak tumble cylinder cover structure for use, and comprises a combustion chamber pit positioned at the top of a piston and a combustion chamber upper area surrounded by a cylinder cover bottom plane and a cylinder sleeve, and is characterized in that the bottom of the combustion chamber pit comprises an upward-convex rotary central convex part and a circumferential annular pit surrounding the central convex part, two spark plugs are arranged on the cylinder cover bottom plane and are respectively positioned on two sides of the central convex part and positioned above the annular pit, the surface of the central convex part is an upward-convex smooth curved surface, the surface of the annular pit is a downward-concave smooth curved surface extending from the periphery of the central convex part to the side wall of the combustion chamber pit, the distance between the bottom of the annular pit and the upper surface of the piston is 0.15-0.3 times of the diameter of the piston, the distance between the top of the central convex part and the upper surface of the piston is 5-7 mm, and the compression of the combustion chamber is 0.05-0.2 times of the radius of the piston.
2. The combustion chamber of claim 1 wherein any plane passing through the axis of the piston is a longitudinal piston center plane, the intersection of the combustion chamber pocket and the longitudinal piston center plane is a combustion chamber pocket profile, the combustion chamber pocket profile comprises a central bulge profile and two annular pocket profiles respectively connected to two ends of the central bulge profile, and the annular pocket profiles are smoothly connected to the central bulge profile.
3. The combustor of claim 2, wherein said central lobe profile is a circular arc and/or said annular pocket profile is a circular arc.
4. The combustion chamber of claim 3 wherein the radius of the central lobe profile is 0.8-2 times the piston diameter and/or the radius of the annular dimple profile is 0.3-0.6 times the piston diameter.
5. The combustion chamber of claim 2 wherein said combustion chamber dimple pattern is symmetrically disposed about said piston axis.
6. The combustion chamber of any of claims 1-5 wherein the upper edge of the combustion chamber recess has a diameter of 0.6 to 0.9 times the diameter of the piston.
7. The combustion chamber as set forth in any one of claims 1-5, wherein two of said spark plugs are symmetrically disposed on both sides of said central boss portion.
8. The combustion chamber as claimed in claim 7, wherein the bottom plane of the cylinder head is provided with two inlet throats and two exhaust throats, and one spark plug is respectively arranged between the two inlet throats and between the two exhaust throats.
9. The combustion chamber of claim 7 wherein said spark plug is located directly above the lowest depression of said annular recess.
10. A gas engine characterized by comprising a combustion chamber according to any one of claims 1 to 9.
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|---|---|---|---|
| CN202211143440.3A CN115405409B (en) | 2022-09-20 | 2022-09-20 | Combustion chamber and gas engine |
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| CN202211143440.3A CN115405409B (en) | 2022-09-20 | 2022-09-20 | Combustion chamber and gas engine |
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| CN115405409B CN115405409B (en) | 2024-05-17 |
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2022
- 2022-09-20 CN CN202211143440.3A patent/CN115405409B/en active Active
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