CN106014600A - Combustion system of gas engine - Google Patents
Combustion system of gas engine Download PDFInfo
- Publication number
- CN106014600A CN106014600A CN201610445602.7A CN201610445602A CN106014600A CN 106014600 A CN106014600 A CN 106014600A CN 201610445602 A CN201610445602 A CN 201610445602A CN 106014600 A CN106014600 A CN 106014600A
- Authority
- CN
- China
- Prior art keywords
- piston
- combustion system
- gas
- gas engine
- combustion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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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
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression 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
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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
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
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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
Abstract
The invention belongs to the technical field of engine mixed gas formation and combustion, and provides a combustion system of a gas engine. The combustion system of the gas engine comprises a cylinder liner, a cylinder cover, a piston, a combustion chamber and a diesel injector; according to the design scheme, the combustion chamber is w-shaped, an inlet of the piston is small while a basin bottom of the piston is deep, and the bottom surface of the piston is enveloped by two Bessel function curves. By the combustion system of the gas engine, the surface-to-volume ratio of the combustion chamber of the engine can be reduced effectively, so that heat transfer loss in a combustion process is reduced; emission of non-combusted hydrocarbon and carbon monoxide can be reduced effectively; and low oxynitride and high thermal efficiency are kept. The combustion system of the gas engine is reasonable in design and simple in structure, and is suitable for an engine in which natural gas used as main fuel is sprayed from a gas inlet channel and a small amount of diesel used as ignition fuel is directly sprayed from the inside of a cylinder.
Description
Technical field
The present invention relates to a kind of engine mixed gas that belongs to formed and the gas engine combustion system of combustion field, particularly
A kind of combustion system using the diesel oil ignited gaseous mixture of trace.
Background technology
Natural gas, as the alternative energy source of great potential, is one of important means realizing traffic and transport field energy-saving and emission-reduction.
Use natural gas as main fuel, trace diesel oil as the auxiliary fuel of the natural gas that ignites in compression ignition engine, can
With the problem that effectively solution conventional diesel engine nitrogen oxide NOx and soot Soot discharge are high.But, conventional compression ignition formula is sent out
Motivation is using diesel oil as main fuel, according to the spray burning characteristics design combustion system of diesel oil.If continuing to use this burning
System carries out the pre-mixing combustion of natural gas/air, understands due to flow field intensity more weak in cylinder, bigger surface to volume ratio, and
The problems such as flame propagation velocity is slow, heat transfer loss big, wall extinguishing is serious occur in combustion, and causes higher
Unburned hydrocarbon UHC and carbon monoxide CO discharge, to such an extent as to have influence on the efficiency of combustion of electromotor.
Summary of the invention
Discharging to improve UHC and CO of gas engine combustion system, improve its efficiency of combustion, the present invention designs
The combustion system that a kind of gas engine combustion system is special.This combustion system is keeping compression ignition engine higher compression
On the premise of Bi, decrease the surface to volume ratio of combustor, thus improve the wall extinguishing of heat transfer loss and flame.By carrying
Eddy flow around axial direction preferably promotes diesel pilot and being mutually mixed of pre-mixed gas in cylinder in high cylinder so that more
The fuel activity of multizone is improved.Form stronger crowded stream and inverse squish near top dead center, be conducive to accelerating
The spread speed of combustion process Flame.These factors all make in-cylinder combustion tissue be optimised, and efficiency of combustion is carried
Height, thus reduce UHC and the CO discharge of electromotor.
The present invention is achieved through the following technical solutions, the present invention include cylinder jacket, cylinder head, piston, burning
Room, diesel injector, cylinder head is arranged in the top of cylinder jacket, in piston arranges cylinder jacket, combustor by cylinder jacket (1),
Cylinder head, piston are constituted, and diesel injector is arranged in the middle position of combustor, and natural gas is by intake port injection, in pressure
Being that natural gas/air pre-mixing closes gas in combustor in compression process, diesel injector is many spray orifices, small-bore fuel injector, lives
Two sections of Bessel function curves of underrun of plug give envelope.
Further, in the present invention, combustor have employed ω type design, and the entrance of piston is less, deeper at the bottom of basin.
Further, the combustion system of the present invention uses the diesel oil ignited natural gas of trace.
Further, in the present invention, draw combustion diesel fuel and can use single hop or multi-injection.
Further, in the present invention, combustion-chamber shape can be logical on the premise of keeping original high compression ratio constant
The control node overregulating Bessel function curve is optimized
Piston bottom surface is formed by two sections of smooth curve envelopes, and every section of envelope curve is all used alone a three cubed Bezier
Function is described by.Piston bottom shape can be changed by adjusting the setting of Bessel function multinomial coefficient, so as to
Preferably adapt to the needs of Flow field flowing.Simultaneously, it is desirable to the region of Bessel function curve institute envelope is keeping volume
On the premise of constant, (i.e. compression ratio is constant) reduces surface area as far as possible, to reduce heat transfer loss and the impact on burning thereof.
Piston inlet port uses small-bore shrinkage type design, is conducive to producing strong crowded stream (piston near combustion top dead center
Up) squeeze stream (descent of piston) with inverse.Combustor use dell formula ω type design, can produce at dell around
The large scale eddy flow that the axial direction of motion of piston is stronger.
Compared with prior art, the advantage of the special combustion system of gas engine combustion system of the present invention includes: profit
Build the curve shape of piston base with Bessel function, by rationally arranging Bessel function coefficient, face can be formed
Smaller, meet In-Cylinder Flow demand and with diesel pilot spraying cooperate combustion-chamber shape design；Select ω type
The combustor of design, reduces piston inlet port bore and uses dell type pelvic floor structure, being conducive to strengthening Flow field
Intensity, thus flame when promoting the mixing of diesel pilot and environment gas and burn is propagated.Finally, this burning
The heat transfer loss of system is minimized, efficiency of combustion is improved, UHC and CO discharge also decreases.
Accompanying drawing explanation
Fig. 1 is the structural representation of the gas engine combustion system described in the embodiment of the present invention；
Fig. 2 is based on the combustion-chamber shape described by Bessel function curve；
Label in accompanying drawing is respectively as follows: 1, cylinder jacket, and 2, cylinder head, 3, piston, 4, combustor, 5, diesel oil spray
Oil device.
Detailed description of the invention
Below in conjunction with the accompanying drawings embodiments of the invention are elaborated, the present embodiment premised on technical solution of the present invention,
Give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As it is shown in figure 1, the present invention includes cylinder jacket 1, cylinder head 2, piston 3, combustor 4, diesel injector 5,
Cylinder head 2 is arranged in the top of cylinder jacket 1, and in piston 3 arranges cylinder jacket 1, combustor 4 is by cylinder jacket 1, cylinder
Lid 2, piston 3 constitute, diesel injector 5 is arranged in the middle position of combustor 4, natural gas by intake port injection,
Being that natural gas/air pre-mixing closes gas in combustor 4 in compression process, diesel injector 5 is many spray orifices, small-bore spray
Oil device, two sections of Bessel function curves of the underrun of piston 3 give envelope；Combustor 4 have employed ω type design,
The entrance of piston 3 is less, deeper at the bottom of basin；Combustion system uses the diesel oil ignited natural gas of trace；Draw combustion diesel fuel can use
Single hop or multi-injection；Combustor 4 shape can be on the premise of keeping original high compression ratio constant, by regulation shellfish plug
You are optimized by the control node of function curve.
Shown in Fig. 2 is to utilize the combustion-chamber shape described by Bessel function curve.Section A-B and B-C section are respectively two
Individual three cubed Bessel function curve is constituted, and detailed expression formula is as follows:
Wherein t ∈ [0,1].
In the present embodiment, relative dimensions is provided that Cdep=24.37mm, Lcp3=16.08mm, Lcp4=4.68mm,
R1=0.6975, R2=0.6949, R3=1.1, R4=0, Rbowl=35mm, Hpst=R1×Cdep=17.00mm, CP1=R3
×Hpst=18.70mm, CP2=R4×Hpst=0mm, Lbt=R2×Rbowl=24.32mm.
Claims (5)
1. a gas engine combustion system, including cylinder jacket (1), cylinder head (2), piston (3), combustor
(4), cylinder head (2) is arranged in the top of cylinder jacket (1), in piston (3) arranges cylinder jacket (1), and combustor
(4) it is made up of cylinder jacket (1), cylinder head (2), piston (3), it is characterised in that also include diesel injector (5),
Diesel injector (5) is arranged in the middle position of combustor (4), and natural gas is by intake port injection, in compression process
Being that natural gas/air pre-mixing closes gas in combustor (4), diesel injector (5) is many spray orifices, small-bore fuel injector,
Two sections of Bessel function curves of the underrun of piston (3) give envelope.
Gas engine combustion system the most according to claim 1, it is characterised in that described combustor (4) is adopted
By ω type design, the entrance of piston (3) is less, deeper at the bottom of basin.
Gas engine combustion system the most according to claim 2, it is characterised in that combustion system uses trace bavin
Oil ignites natural gas.
Gas engine combustion system the most according to claim 3, it is characterised in that draw combustion diesel fuel and can use list
Section or multi-injection.
Gas engine combustion system the most according to claim 4, it is characterised in that combustion-chamber shape can protected
Hold original high compression ratio constant on the premise of, by regulation Bessel function curve control node be optimized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610445602.7A CN106014600A (en) | 2016-06-20 | 2016-06-20 | Combustion system of gas engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610445602.7A CN106014600A (en) | 2016-06-20 | 2016-06-20 | Combustion system of gas engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106014600A true CN106014600A (en) | 2016-10-12 |
Family
ID=57085541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610445602.7A Pending CN106014600A (en) | 2016-06-20 | 2016-06-20 | Combustion system of gas engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106014600A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114510799A (en) * | 2022-01-26 | 2022-05-17 | 北京理工大学 | Free piston engine thermal efficiency improving method based on driving process control |
| CN117028016A (en) * | 2023-10-09 | 2023-11-10 | 潍柴动力股份有限公司 | In-cylinder direct injection methanol engine and combustion chamber thereof and combustion chamber parameter determining method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62282113A (en) * | 1986-05-30 | 1987-12-08 | Isuzu Motors Ltd | Direct injection type internal combustion engine |
| JPH01193019A (en) * | 1988-01-29 | 1989-08-03 | Toyota Motor Corp | Combustion chamber of direct injection type diesel engine |
| US20040112323A1 (en) * | 2002-12-13 | 2004-06-17 | Zhengbai Liu | Simplified combustion chamber |
| CN203146098U (en) * | 2013-03-21 | 2013-08-21 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Combustion chamber suitable for low-temperature premixing combustion technology |
| CN204677337U (en) * | 2015-06-16 | 2015-09-30 | 快马天然气动力科技（苏州）有限公司 | A kind of universal Diesel Fuel-Natural Gas Dual fuel Electricity Spurt System |
-
2016
- 2016-06-20 CN CN201610445602.7A patent/CN106014600A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62282113A (en) * | 1986-05-30 | 1987-12-08 | Isuzu Motors Ltd | Direct injection type internal combustion engine |
| JPH01193019A (en) * | 1988-01-29 | 1989-08-03 | Toyota Motor Corp | Combustion chamber of direct injection type diesel engine |
| US20040112323A1 (en) * | 2002-12-13 | 2004-06-17 | Zhengbai Liu | Simplified combustion chamber |
| CN203146098U (en) * | 2013-03-21 | 2013-08-21 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Combustion chamber suitable for low-temperature premixing combustion technology |
| CN204677337U (en) * | 2015-06-16 | 2015-09-30 | 快马天然气动力科技（苏州）有限公司 | A kind of universal Diesel Fuel-Natural Gas Dual fuel Electricity Spurt System |
Non-Patent Citations (1)
| Title |
|---|
| 常思勤: "《车辆及其发动机CAD技术》", 31 July 1996, 北京理工大学出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114510799A (en) * | 2022-01-26 | 2022-05-17 | 北京理工大学 | Free piston engine thermal efficiency improving method based on driving process control |
| CN117028016A (en) * | 2023-10-09 | 2023-11-10 | 潍柴动力股份有限公司 | In-cylinder direct injection methanol engine and combustion chamber thereof and combustion chamber parameter determining method |
| CN117028016B (en) * | 2023-10-09 | 2024-01-12 | 潍柴动力股份有限公司 | In-cylinder direct injection methanol engine and combustion chamber thereof and combustion chamber parameter determining method |
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Application publication date: 20161012 |
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