CN101451463A - Fuel oil uniform mixing and burning system of double air ports diesel engine - Google Patents
Fuel oil uniform mixing and burning system of double air ports diesel engine Download PDFInfo
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- CN101451463A CN101451463A CNA2008102436537A CN200810243653A CN101451463A CN 101451463 A CN101451463 A CN 101451463A CN A2008102436537 A CNA2008102436537 A CN A2008102436537A CN 200810243653 A CN200810243653 A CN 200810243653A CN 101451463 A CN101451463 A CN 101451463A
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Abstract
The present invention relates to a fuel equipartition mixture and combustion device design proposal of two valve diesel. A fuel injector set on the cylinder cap and an inlet channel; a burning compartment is below the fuel injector and inlet channel; the inlet channel is eddy flow type inlet channel; a drop pit shape shrunk burning compartment in the shape of letter W is set above the valve; head section of the fuel injector stretches out of the bottom of the cylinder cap and against the burning compartment. Parameter design of cylinder cap, fuel injector and burning compartment make fuel and air adequate distribution in certain rules on axial and circumferential direction within effective combustion space, and realize oil gas mixing design of equal excess air factor within effective combustion space. Under effect of high jet pressure and air-intake transverse currents of fuel injection system, oil gas inside the cylinder mixes uniformly, velocity of combustion quicker, duration short, oil spout can be postponed, and high-efficiency quick burning of low discharge can be realized. Engine synthetic performance can be optimized through the invention, and engine power can be improved while nocuousness discharged object can be reduced.
Description
Technical field
The present invention relates to a kind of firing unit of motor, uniform mixing of particularly a kind of fuel oil of two valve diesel reentrant combustion chambers and firing unit.
Background technique
For making diesel engine performance optimization, the combustion system design is crucial, small-bore diesel engine generally mostly is two air valve structures and (advances, each one of exhaust valve), the firing chamber is owing to advanced, exhaust valve, the spatial constraints that oil sprayer is arranged, two valve center on lines, the firing chamber shaft axis all must be offset to cylinder centerline, the oil sprayer axis also needs center, bias combustion chamber and arranges with the angle of inclination, oil nozzle position off-centre is uneven in length the oil bundle of each spray orifice, be in tilted layout simultaneously and make fuel injection quantity uneven in firing chamber distribution possibility, during oil gas in cylinder of diesel engine mixes, fuel oil is in the influence very big to the perfect generation of velocity of combustion and burning of active combustion spatial distributions, thereby influences engine power performance, emission performance.So far people have proposed the distribution scheme of multiple fuel oil in the firing chamber, as the oil bundle distribution existing equal angles circumferential in traditional Zhi Kou firing chamber, on circular arc, the design proposal of homalographic, and it is axial in the firing chamber, known designs is analyzed the distribution of fuel oil in the firing chamber from oily line at the drop point height of firing chamber etc., these designs go to organize oil gas to mix from difference research thinking, make fuel oil even as far as possible with air mixing in the firing chamber, but studies show that of diesel engine fuel injection system: the tilting fuel flow of each spray orifice that makes of oil sprayer does not wait, even therefore the inventor thinks that the homalographic design is not yet is circumferential (circumferencial direction) uniform design that oil gas mixes, the cylinder axis of firing chamber to oil gas mixing and burning good and bad still at present more adopt the methods examination of one-parameters test to gather to carry out, determine design proposal with the final results of property of diesel engine.Require the domestic original work of research of oil gas mixed distribution of the reentrant combustion chamber adopted less to low emission in recent years, particularly low emission is designed, the inventor thinks the oil gas mixing and burning that must study the firing chamber useful space from space-time concept(ion), therefore the complete uniform scheme of bags fuel oil is still unresolved, the uniform design in quantitative space still has certain degree of difficulty, is that people expect the technical problem that solves always.
Summary of the invention
The purpose of this invention is to provide uniform mixing of a kind of two valve diesel fuel oils and combustion system, it is to make two valve diesel when obtaining good power character, and the four-cycle diesel fuel oil that can effectively reduce diesel emission evenly mixes and improve fast the combustion system of burning in the active combustion space with air.
The technical solution of the present invention that realizes above-mentioned purpose is as follows: uniform mixing of two valve diesel fuel oils and combustion system, have oil sprayer and intake and exhaust port on the cylinder head of being installed in, the intake and exhaust port below is a piston, it between cylinder head bottom surface and piston-top surface the firing chamber, it is characterized in that, intake duct is spiral intake duct, be provided with the firing chamber of giving prominence in the middle of the reducing pit shape in the firing chamber below oil sprayer and intake duct, oil sprayer tilts to be installed on the cylinder head, the head of oil sprayer stretches out cylinder head bottom surface certain altitude, and facing to the firing chamber.
The intake duct that is provided with on the two valve diesel cylinder head of the present invention is a cyclone structure, pit shape above the firing chamber along cylinder axis to for reducing toroidal combustion chamber, intake method has the design proposal of natural aspiration and different supercharging levels, different schemes engine chamber reducing rate (ratio of bore and maximum diameter on the firing chamber) is generally 0.82 to 0.90, in the heart off-centre generally is not more than 8% firing chamber reducing bore in oil sprayer center and the firing chamber, the oil nozzle head spray orifice of oil sprayer is generally 4 to 8, the boss shape that the oil bundle axis of each spray orifice ejection forms a cone and center, firing chamber is complementary, the cone that forms axially is being divided into active combustion space (clearance space of piston head pit and pit correspondence suitable for reading) two-part up and down, by parameter designing fuel oil oil bundle is evenly distributed at axial and circumferential, guarantee that fuel oil realization in active combustion space, firing chamber waits excess air coefficient to distribute, and mixes by oil gas and realizes fast, perfect combustion.
Firing chamber axial design: by cylinder head, firing chamber, oil nozzle parameter designing, lower half portion spatial volume that the cone cover that the oil bundle axis of each spray orifice of oil sprayer forms and the volume ratio of active combustion spatial volume are controlled at about 56% (when piston is positioned at top dead center position, different firing chamber reducing rates, volume ratio changes ± 3%), can realize the axial uniform scheme of fuel oil, diesel engine combination property optimum in the active combustion space.Firing chamber ω type reducing rate value is little, and this volume ratio is got big value.Because the oil bundle of oil spout wall along the firing chamber skew wall, reducing rate value is little, and the firing chamber skew wall diminishes with the axis angle of oil bundle, and it is many that fuel oil the fuel oil quantitative change in lower half portion space of oil bundle cone behind the wall, volume ratio is got big value makes the bottom air quantity many, guarantees that the ratio of axial oil gas mixing is even.
The firing chamber is circumferentially designed: the oil bundle center line of each spray orifice of oil sprayer is divided into several parts identical with the spray orifice number in the projection of piston head pit maximum diameter with area of contour.Because two air valve structures, oil sprayer tilts to install, and the angle that forms between each spray orifice axis and oil sprayer axis does not wait, and causes fuel oil flow resistance difference, and each spray orifice fuel injection quantity does not wait, and spray orifice axis and oil sprayer axis angle are big, and the fuel injection quantity of this spray orifice is many.Uniform for realizing fuel oil in active combustion space, firing chamber, design to oil nozzle, combustion-chamber parameter is: area of contour and two spray orifice fuel injection quantity sizes that adjacent oil bundle center line and combustion recess circular arc form are in direct ratio, and its ratio is definite value to a combustion system of diesel engine.When the oil sprayer mounting inclination angle is determined, oil sprayer is determined with each the spray orifice axis and the axial angle of oil sprayer of oil nozzle, the fuel injection quantity difference of each spray orifice (there are some researches show this value maximum can reach ± 15%) just can be determined, determine of the distribution of oily line according to this difference size, realize the uniform design of the circumferential oil gas mixing of firing chamber in the firing chamber.
Above-mentioned described measure makes fuel oil axial and circumferentially uniform design of oil gas of excess air coefficient such as realization in the firing chamber in the firing chamber, the air motion effect of high injection pressure and intake swirl by oil spout, the interior oil gas of cylinder is mixed, velocity of combustion is accelerated, and the duration is short, and burning in time, so can realize quick, perfect burning, can obtain good power character and Economy, by optimizing injection time, reduce harmful emission of diesel engine simultaneously.Therefore use the combination property that the present invention can optimize motor, make motor when obtaining good power, reduce disposal of pollutants.The present invention is in single cylinder diesel and four cylinder light vehicle diesel engine research experiment.Implement a H24 single cylinder diesel of the present invention by designed combustion of the present invention system, make the oil gas hybrid optimization, burning improves, the test result of diesel engine performance shows: keep the diesel engine nominal power constant, the more former machine of diesel emission and smoke intensity obviously descends, CO drops to 2.02g/kWh from 3.98 of former machine, and HC drops to 0.62g/kWh, NO from former machine 1.21
XSubstantially constant, smoke intensity drops to 1.8FSU from former machine 3.2, and simultaneously the more former machine of the fuel consumption rate 4.5g/kWh that also descended reaches the domestic the newest emission standard requirement of strict low-speed cars diesel engine smoothly.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Among the figure, 1 wrist pin, 2. piston ring, 3. cylinder liner, 4. intake duct, 5. reducing toroidal combustion chamber, 6. oil sprayer, 7. cylinder head, 8. piston, E1 is the compression clearance.
Fig. 2 is a fundamental diagram of the present invention.
Among the figure, 11,12,13,14,15th, the center line of oil sprayer spray orifice oil spout, 6. oil sprayer, 7. cylinder head, 8. piston, 21 is cylinder centerline, and 31 is the firing chamber center line, and 41 is the oil nozzle center line, and O is a cylinder axis, O
1Be center, firing chamber, O
2The oil nozzle center, E is the throw of eccentric of oil nozzle relative combustion chamber.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described further.
Uniform mixing of two valve diesel fuel oils and rapid combustion system, structural drawing is seen Fig. 1, have oil sprayer 6 and rotary flow type intake duct 4 on cylinder head of being installed in 7, cylinder head 7 bottom surfaces and piston 8 end faces and cylinder liner 3 are formed the firing chamber, below oil sprayer 6 and intake duct 4, be provided with the firing chamber 5 of a pit shape above the piston head, the head of oil sprayer 6 stretches out cylinder head 7 bottom surfaces and facing to firing chamber 5.Oil sprayer axis and firing chamber center line angle are that 10 to 23 degree do not wait.
Fig. 2 is a fundamental diagram of the present invention, 21 is cylinder centerline, 31 is the firing chamber center line, 41 is the oil nozzle center line, because inlet and exhaust valve and oil nozzle head will be arranged in the diameter of piston 8, the oil nozzle oil spout oily as far as possible line that distributes in the firing chamber is isometric, causes the reducing toroidal combustion chamber off-centre at piston 8 tops, and structural design makes oil sprayer 6 center O
2With the firing chamber center O
1The eccentric E of one oil sprayer is arranged, fuel injection in the firing chamber, active combustion spatial volume V such as figure section line part, it accounts for about 82 to 95% of combustion chamber volume, is the main space of fuel oil and air mixing, burning.Its formation is: between the bottom surface of cylinder head 7 and piston 8 top surfaces one cylinder clearance E1 is arranged, form the reducing toroidal combustion chamber space at part active combustion spatial volume and piston 8 tops on the firing chamber reducing at piston 8 tops.Oil sprayer is a porous, and Fig. 2 provides the example of one 5 hole oil sprayer, and the oily intrafascicular heart line of spray orifice ejection forms cone, and the active combustion spatial volume is divided into upper volume V
1With lower volume V
2, V
2The ratio of/V is volume ratio, discovers that this value is about 56%, and axially oil gas mixes in the firing chamber, burning reaches optimization.The drop point of oil spout oil bundle in the firing chamber is respectively 11 among Fig. 2,12, ..., 15, oil sprayer 6 established angles are determined, each the spray orifice fuel injection quantity difference of oil nozzle and the relation of spray orifice and oil sprayer axis angle by oil nozzle, combustion-chamber parameter design, make 11-O among Fig. 2 by obtaining in the data of injection system result of study
2-12 area A that form
12, 12-O
2-13 area A that form
23..., 15-O
2The area A of-11 formation
51With the ratio of corresponding spray orifice fuel injection quantity be definite value, make circumferentially in fuel oil and Air mixing than the design principle that equates.
The present invention is by above-mentioned design, adopt the rotary flow type intake duct, by the parameter designing of oil sprayer, piston, cylinder head, make fuel oil in the firing chamber axially, circumferentially all evenly distribute, in the effect of injection system high injection pressure and intake swirl, oil gas mixes in the cylinder, velocity of combustion is accelerated, and the duration is short, and burning in time, realize efficient rapid combustion, reached the purpose that improves engine power and reduce noxious emission.
Claims (3)
1, uniform mixing of a kind of fuel oil of two valve diesel and combustion system, comprise the oil sprayer and the intake duct that are installed on the cylinder head, the intake duct below is a piston, it between cylinder head bottom surface and piston-top surface the firing chamber, it is characterized in that, intake duct is the eddy flow intake duct, below oil sprayer and the intake duct, be provided with the reducing toroidal combustion chamber of a pit shape above the piston head, the head of oil sprayer stretches out the cylinder head bottom surface and facing to the firing chamber; By cylinder head, oil sprayer, combustion-chamber parameter design, make fuel oil and air in the active combustion space, realize evenly distributing by certain rule vertically with circumferentially, realize waiting in the active combustion space oil gas mix design of excess air coefficient.
2, uniform mixing of the fuel oil of two valve diesel according to claim 1 and combustion system, it is characterized in that: the intrafascicular heart line of each spray orifice oil of oil sprayer forms a cone and axially the active combustion space is being divided into two-part up and down, piston is positioned at top dead center position, and lower half portion spatial volume that the cone cover and the ratio of active combustion spatial volume are between 56 ± 3%.
3, uniform mixing of the fuel oil of two valve diesel according to claim 1 and combustion system is characterized in that: each spray orifice oil bundle axis of oil sprayer is divided into several parts identical with the spray orifice number in the projection of piston head pit maximum diameter with the firing chamber; Each several part area and adjacent two jet orifice fuel injection quantity are in proportion, and this ratio is definite value to a combustion system of diesel engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102436537A CN101451463B (en) | 2008-12-05 | 2008-12-05 | Fuel oil uniform mixing and burning system of double air ports diesel engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102436537A CN101451463B (en) | 2008-12-05 | 2008-12-05 | Fuel oil uniform mixing and burning system of double air ports diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101451463A true CN101451463A (en) | 2009-06-10 |
| CN101451463B CN101451463B (en) | 2012-04-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008102436537A Expired - Fee Related CN101451463B (en) | 2008-12-05 | 2008-12-05 | Fuel oil uniform mixing and burning system of double air ports diesel engine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112879148A (en) * | 2021-01-25 | 2021-06-01 | 华中科技大学 | Asymmetric combustion chamber system suitable for high power density diesel engine |
| CN112879149A (en) * | 2021-01-25 | 2021-06-01 | 华中科技大学 | Asymmetric combustion chamber system suitable for high power density diesel engine |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2702073Y (en) * | 2003-11-26 | 2005-05-25 | 山东华源莱动内燃机有限公司 | Oil spraying device |
| CN101113683A (en) * | 2007-09-14 | 2008-01-30 | 奇瑞汽车有限公司 | Directly jetting diesel engine combustion system |
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2008
- 2008-12-05 CN CN2008102436537A patent/CN101451463B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112879148A (en) * | 2021-01-25 | 2021-06-01 | 华中科技大学 | Asymmetric combustion chamber system suitable for high power density diesel engine |
| CN112879149A (en) * | 2021-01-25 | 2021-06-01 | 华中科技大学 | Asymmetric combustion chamber system suitable for high power density diesel engine |
| CN112879149B (en) * | 2021-01-25 | 2022-11-08 | 华中科技大学 | Asymmetric combustion chamber system suitable for high power density diesel engine |
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| CN101451463B (en) | 2012-04-04 |
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