Fuel oil four-split-flow type combustion chamber

Abstract

The invention discloses a fuel oil four-split-flow type combustion chamber, and relates to a direct injection type diesel engine combustion chamber, the fuel oil four-split-flow type combustion chamber comprises a pit, a split-flow wall and a backflow area which are arranged from bottom to top, a plurality of split-flow ridges are arranged on the split-flow wall, and split-flow points are arranged on the split-flow ridges; the diversion ridge and the concave pit form a first diversion area downwards along the diversion ridge, the diversion ridge and the backflow area form a second diversion area upwards along the diversion ridge, and the third diversion area and the fourth diversion area are formed along the two sides of the diversion ridge and the diversion wall respectively. By means of the principle that fuel oil is shunted in four directions through the shunting ridges, active guiding of local fuel oil flowing to a specific area in the combustion chamber can be achieved, the combustion organization concept that the fuel oil in the combustion chamber is evenly dispersed and then broken is achieved, the air utilization rate in the combustion chamber is greatly increased, the fuel oil can be fully mixed with air, and the combustion efficiency is improved. And therefore, the whole combustion process is improved, the combustion efficiency is improved, and the fuel consumption rate and soot emission are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of diesel engine combustion chambers, and in particular relates to a fuel four-flow combustion chamber. Background Art

[0002] The combustion and emission characteristics of modern direct injection diesel engines mainly depend on the quality of the oil-gas mixture in the combustion chamber, and the quality of the oil-gas mixture will affect fuel consumption and the emission of soot particles. In order to meet the increasingly stringent National VI B emission regulations, it is necessary to start with the combustion chamber body structure and innovate and improve the existing combustion chamber structure so that a better oil-gas mixture can be obtained under the same injection parameters. By improving the combustion chamber structure, the fuel is more widely distributed in the combustion chamber cylinder, and more air is entrained, and it mixes with the air faster, further reducing the fuel consumption of the diesel engine and improving the emission of soot particles. Therefore, optimizing the combustion chamber structure is an important means to improve the quality of the mixture, optimize the combustion process, and reduce the fuel consumption and soot particle emissions of diesel engines.

[0003] The mainstream combustion chamber currently used in diesel engines is the ω-type combustion chamber, which is widely used due to its simple structure and easy manufacturing. However, the oil-gas mixing rate in the squeeze flow area and the bowl lip of the ω-type combustion chamber is slow, resulting in insufficient air utilization in the top space of the combustion chamber. The fuel spray is not fully guided in the combustion chamber, so that the air and fuel spray in the combustion chamber are not fully and evenly mixed, which ultimately leads to low engine thermal efficiency and high exhaust pollutant content. Most of the diesel engine combustion chambers disclosed in the prior art have not been able to fully solve the above problems, and there is still room for improvement in the distribution of fuel in the combustion chamber and the utilization of air. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a small-displacement, high-compression ratio fuel four-flow combustion chamber suitable for a high-pressure common rail diesel engine in view of the deficiencies in the prior art, so as to expand the radial and circumferential distribution range of the fuel, improve the air utilization rate of the space in the cylinder of the diesel engine combustion chamber, better promote oil-gas mixing and thus achieve the purpose of improving power and emission performance, so as to effectively solve the key problem of increased emissions caused by uneven oil-gas mixing in the combustion chamber of the diesel engine.

[0005] A fuel four-diversion diesel engine combustion chamber described in the present invention includes a pit, a diversion wall and a reflow zone arranged from bottom to top, a plurality of diversion ridges are arranged on the diversion wall, and a diversion point is provided on the diversion ridge to form a first diversion zone with the pit downward along the diversion ridge, a second diversion zone with the reflow zone upward along the diversion ridge, and a third diversion zone and a fourth diversion zone respectively formed along both sides of the diversion ridge and the diversion wall.

[0006] As a further improvement, one end of the diverter ridge extends toward the reflow zone, and a baffle is formed on one side of the reflow zone to divide the second diverter zone into a second vortex zone located between the cylinder head and the baffle and a third vortex zone located in the reflow zone and corresponding to the position of the baffle.

[0007] As a further improvement, the aspect ratio of the diverter ridge is: d1 / h1=0.682*N-0.628; wherein d1 is the width of the diverter ridge, h1 is the protruding height of the diverter ridge, and N is the number of the diverter ridges.

[0008] Furthermore, the width d1 of the diverter ridge is 3.8-5.4 mm; and the protruding height h1 of the diverter ridge is 0.9-1.1 mm.

[0009] As a further improvement, the arc radius R1 of the diverter ridge and the diverter wall is consistent, which is 9.2-10.0 mm.

[0010] As a further improvement, the arc length L1 of the diverter ridge and the diverter wall is consistent, which is 8.3-9.0 mm.

[0011] As a further improvement, an injector is provided above the combustion chamber, and a plurality of injection holes are opened on the injector. The plurality of injection holes correspond one-to-one to a plurality of diversion ridges. The center line of each injection hole faces the tip of the opposite diversion ridge, and the point where the two intersect is used as the diversion point.

[0012] Furthermore, the injection angle θ1 of the injector is 10 to 25 degrees.

[0013] As a further improvement, a middle convex block is provided inside the concave pit, and a smooth slope θ2 of the middle convex block is 11 to 16 degrees.

[0014] As a further improvement, the depth h2 of the reflow zone is 3.2-4.0 mm, and the width d2 is 9.0-12.0 mm.

[0015] Beneficial Effects

[0016] The advantages of the present invention are as follows: the fuel four-dividing combustion chamber of the present invention is provided with evenly distributed diverting ridges on the diverting wall structure, which can make the oil beam hit the diverting point on the diverting ridge to form a four-way diversion, which can not only expand the distribution range of the oil beam in the radial direction, but also expand the distribution range of the oil beam in the circumferential direction. The four-way flow guidance of the diverting ridge makes the fuel spray quickly and evenly distributed in the combustion chamber. At the same time, the oil beam diffused circumferentially on the diverting wall can also be sucked into the combustion chamber cylinder after collision, and it is easier to fully mix with the air in the cylinder, so that the utilization rate of the air in the cylinder is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a schematic diagram of the structure of the fuel four-flow combustion chamber of the present invention;

[0018] Figure 2 It is a schematic diagram of the diffusion of the oil beam after the oil beam in the combustion chamber is divided into four flows by one-eighth model of the fuel quarter-flow type combustion chamber of the present invention;

[0019] Figure 3 It is a schematic diagram of the first cross-sectional structure of the fuel four-flow combustion chamber of the present invention;

[0020] Figure 4 It is a schematic diagram of the movement of the oil beam of the lateral diversion of the fuel four-diversion type combustion chamber of the present invention;

[0021] Figure 5 It is a second cross-sectional structural schematic diagram of the fuel four-dividing flow type combustion chamber of the present invention, wherein the left side is a cross-sectional view with the diverting wall as the cross-section, and the right side is a cross-sectional view with the diverting ridge as the cross-section;

[0022] Figure 6 for Figure 4 Schematic diagram of the enlarged structure of the diverter ridge shown at A in the middle.

[0023] In the figure, 1. combustion chamber; 2. injector; 3. diverter ridge; 4. diverter wall; 5. recirculation zone; 6. pit; 7. piston; 8. cylinder head; 9. cylinder; 10. diverter point; 11. first diverter zone; 12. second diverter zone; 13. third diverter zone; 14. fourth diverter zone; 15. flow blocking part; 16. middle protrusion; 121. second vortex zone; 122. third vortex zone. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the embodiments, but it does not constitute any limitation to the present invention. Any limited number of modifications made by anyone within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0025] See also Figure 1-Figure 6The present invention provides a fuel four-dividing combustion chamber, comprising a pit 6, a diverter wall 4 and a recirculation zone 5 arranged from bottom to top. As for the combustion chamber 1, it is a cavity arranged between the top of the piston 7 and the cylinder head 8. An injector 2 is arranged at the top of the combustion chamber 1. The injector 2 is mounted on the cylinder head 8. The axis of the injector 2 coincides with the center axis of the combustion chamber 1. The pit 6 is arranged at the bottom of the combustion chamber 1; the diverter wall 4 is arranged above the pit 6 along the circumferential direction of the combustion chamber 1; the recirculation zone 5 is arranged in front of the gap at the top of the combustion chamber 1; the diverter wall 4 is provided with N evenly arranged diverter ridges 3, and the diverter ridges 3 are protrusions facing the center tip of the combustion chamber 1, and the intervals between them are the same. Among them, the diverter ridges 3 can be set to 8 or 6. A diversion point 10 is provided on the diversion ridge 3, so as to form a first diversion area 11 with the pit 6 downward along the diversion ridge 3, a second diversion area 12 with the reflow area 5 upward along the diversion ridge 3, and a third diversion area 13 and a fourth diversion area 14 respectively formed with the diversion wall 4 along both sides of the diversion ridge 3. With regard to the diversion point 10, an injector 2 is provided above the combustion chamber 1 of the present invention, and a plurality of injection holes are provided on the injector 2, and the plurality of injection holes correspond to the plurality of diversion ridges 3 one by one, and the injection hole center line of each injection hole faces the tip of the opposite diversion ridge 3, and the intersection point of the two is used as the diversion point 10. In addition, one end of the diversion ridge 3 extends toward the reflow area 5, and a flow block 15 is formed on one side of the reflow area 5, so as to divide the second diversion area 12 into a second swirling area 121 located between the cylinder head 8 and the flow block 15, and a third swirling area 122 located in the reflow area 5 and corresponding to the position of the flow block 15.

[0026] Figure 2 This is a schematic diagram of one-eighth of the model of the fuel four-flow combustion chamber, and the overall schematic diagram of the oil beam diffusion after the fuel four-flow in the combustion chamber. Figure 2 It can be seen that the combustion chamber 1 is composed of the bottom surface of the combustion chamber pit 6, the diverter wall 4, the diverter ridge 3 and the recirculation area 5 which are smoothly connected in sequence. After the fuel spray is diverted in four directions in radial and axial directions, it can make full use of the air in the combustion chamber 1, and the fuel and air are fully and evenly mixed, thereby improving the mixing quality of oil and gas, and then improving the combustion quality.

[0027] After the fuel is atomized by the fuel injector 2 and injected at a certain injection angle and injection pressure, it hits the diversion ridge 3 and then undergoes diversion movement, forming a four-way diversion of the fuel spray. The four directions of the fuel spray flow are: downward into the combustion chamber pit 6, upward to the top of the diversion ridge 3, and toward the diversion walls 4 on both sides, thereby forming the above-mentioned four diversion areas.

[0028] After the fuel spray is ejected from the injector 2 and hits the diversion point 10 on the diversion ridge 3, the four-division is completed. Figure 3 This is a front view of a fuel four-flow combustion chamber. Figure 3It can be seen that part of the fuel spray moves downward into the pit 6 and upward to the top of the diverter ridge 3.

[0029] The fuel spray diverted to the pit 6 moves along the bottom of the pit 6 toward the central axis of the combustion chamber 1, and at the same time, the fuel spray forms a vortex motion in the pit 6 of the combustion chamber, and the air is sucked in and mixed with the fuel spray, so that the first diversion area 11 is formed downward along the diversion ridge 3 with the pit 6. The inside of the pit 6 is provided with a middle convex block 16. Since the position of the middle convex block 16 is higher than the pit 6, the bottom of the combustion chamber 1 is low at the peripheral position and high at the middle position, so that the fuel spray diverted to the pit 6 moves along the middle convex block 16, and after it encounters the fuel spray above, it is rolled back into the pit 6 again, forming a first vortex area. That is, the first diversion area and the first vortex area exist in the pit 6 at the same time.

[0030] After the fuel spray moving upward toward the top of the diverter ridge 3 reaches the top of the diverter ridge, the fuel spray peels off from the wall surface at the top of the diverter ridge 3 and rushes toward the cylinder head 8. After colliding with the cylinder head 8, the fuel spray undergoes separation and diffusion movement. After separation and diffusion, the fuel spray forms a vortex movement toward the central axis of the combustion chamber 1 and a vortex movement toward the reflow zone 5, which serves as the second diverter zone 12. Among them, the fuel spray moving toward the reflow zone 5 forms a vortex in the reflow zone 5 under the blocking action of the blocking part 15, which serves as the third vortex zone 122; the fuel spray moving toward the central axis of the combustion chamber 1 forms a vortex at the top of the combustion chamber 1, which is the second vortex zone 121. The formation of the vortex is conducive to the entrainment of air by the fuel spray, and makes full use of the air in the gap at the top of the combustion chamber 1.

[0031] Figure 4 This is a schematic diagram of the movement of the oil beam in the lateral diversion of the fuel four-diversion combustion chamber. Figure 4 It can be seen that the oil beam sprayed by the injector 2 forms a lateral diversion after hitting the diversion point 10 on the diversion ridge 3, and forms two fuel flows in opposite directions on the diversion wall 4 between adjacent diversion ridges 3. After the two fuel sprays with opposite movement directions collide with each other, a radial vortex motion toward the center of the combustion chamber will be formed in the combustion chamber 1, which is conducive to the entrainment of the fuel spray toward the center of the cylinder, and can further utilize the air in the center of the combustion chamber 1, so that the fuel and air are evenly mixed and fully burned.

[0032] More specifically, after the fuel spray completes the four-way diversion, the fuel spray that is laterally diverted through the diverter ridge 3 will reach the diverter wall 4, and the lateral diversions formed by adjacent diverter ridges 3 will converge, collide, and separate and diffuse on the surface of the diverter wall 4. The separation and diffusion directions are: toward the center of the combustion chamber 1, toward the top of the diverter wall 4, and toward the pit 6; the fuel spray moving toward the center of the combustion chamber 1 will form a vortex motion in the combustion chamber 1 pointing to the central axis of the combustion chamber 1. The fuel spray is sucked toward the center of the combustion chamber 1, which can further utilize the air in the center of the combustion chamber 1, thereby improving the quality of the mixed oil and gas and the combustion efficiency. After reaching the top of the diverter wall 4, the fuel spray moves away from the wall surface and rushes toward the cylinder head 8. After hitting the cylinder head 8, it separates and diffuses again. After the fuel spray separates and diffuses again, it forms a vortex motion toward the central axis of the combustion chamber 1 and a vortex motion toward the reflow zone 5, which can further utilize the air at the top of the combustion chamber 1, thereby improving the air utilization rate, the quality of the mixed oil and gas, and the combustion efficiency. The fuel spray moving toward the combustion chamber pit 6 moves along the bottom surface of the combustion chamber pit 6 toward the center of the combustion chamber 1, and at the same time forms a vortex in the combustion chamber pit 6, which sucks in air and mixes with the fuel spray, thereby improving the utilization rate of the air in the combustion chamber 1. Since the blocking portion 15 on the diverter ridge 3 is higher than the diverter wall 4, the degree of vortex in the recirculation zone 5 at the position of the blocking portion 15 is greater than the vortex in the recirculation zone 5 corresponding to the diverter wall 4, thereby forming a barrier, so that the vortex / vortex in the diverter wall 4 and the recirculation zone 5 between each two adjacent diverter ridges 3 can move independently, reducing mutual interference / interference and forming a stable flow model.

[0033] Figure 5 This is a cross-sectional view of a fuel four-divided flow combustion chamber. In this figure, the left side is a cross-sectional view with the diverter wall as the cross-section, and the right side is a cross-sectional view with the diverter ridge as the cross-section. Figure 5 In the left view, d3 is the radius of the cylinder liner 9, which is also the radius of the combustion chamber 1; d2 is the width of the recirculation zone 5; d5 is the longest distance from the diverter wall 4 to the central axis of the combustion chamber 1; L1 is the arc length of the diverter wall 4; R1 is the arc radius of the diverter wall 4; R2 is the arc radius of the combustion chamber pit 6; d4 is the shortest distance from the diverter wall 4 to the central axis of the combustion chamber 1. Figure 5 In the right side view, θ2 is the slope of the pit 6 close to the central axis of the combustion chamber 1, that is, the smooth slope of the middle protrusion 16; h1 is the tip height of the diverter ridge 3; and h2 is the depth of the recirculation zone 5. It should be noted that the arc length and arc radius of the diverter ridge 3 are the same as those of the diverter wall 4.

[0034] Figure 6d1 is a partial enlarged view of the diverter ridge in the top view, and d2 is the width of a single diverter ridge 3. It can be clearly seen from the figure that the diverter ridge 3 is characterized by a pointed protrusion toward the center of the combustion chamber 1. The projections of the diverter ridge 3 in the horizontal and vertical directions are both rectangular.

[0035] In the following, in conjunction with the embodiments, the specific design of the present invention is further described by taking the D30 high pressure common rail diesel engine as a test prototype.

[0036] Embodiment 1:

[0037] In a preferred embodiment of the present invention, N is 8, that is, there are 8 spray holes at the lower end of the injector 2, and there are 8 diverter ridges 3 on the corresponding diverter wall 4, and the 8 diverter ridges 3 are evenly distributed in the circumferential direction. The vertical projection height of a single diverter ridge 3 is 6.0 mm, the horizontal projection length of a single diverter ridge 3 is 4.4 mm, the tip protrusion height h1 of a single diverter ridge 3 is 0.9 mm, and the width d1 of a single diverter ridge 3 is 4.3 mm. The arc radius R1 of a single diverter ridge 3 and a diverter wall 4 is 9.2 mm, and the arc length L1 is 8.3 mm. The radius R2 of the combustion chamber pit 6 is 4.4 mm. The shortest distance d4 from the diverter wall 4 to the central axis of the combustion chamber 1 is 26.0 mm, and the longest distance d5 from the diverter wall 4 to the central axis of the combustion chamber 1 is 30.0 mm. The depth h2 of the recirculation zone 5 is 3.2 mm, and the width d2 is 9.0 mm. The smooth slope θ2 of the combustion chamber recess 6 close to the central axis of the combustion chamber 1 is 11 degrees.

[0038] The local operating conditions are set as follows: cylinder diameter is 95mm, compression ratio is 16.5, injection angle θ1 is 25 degrees, spray hole diameter is 0.150mm, and injection pressure is 180Mpa.

[0039] The combustion chamber is designed based on the above parameters of this embodiment. After simulation, the results show that the indicated thermal efficiency of the fuel four-flow combustion chamber system of this embodiment is improved by 3.1%, and the soot generation is reduced by 47.2%.

[0040] Embodiment 2:

[0041] In a preferred embodiment of the present invention, N is 6, that is, there are 6 spray holes at the lower end of the injector 2, and there are 6 diverter ridges 3 on the corresponding diverter wall 4, which are evenly distributed in the circumferential direction. The vertical projection height of a single diverter ridge 3 is 7.0 mm, the horizontal projection length of a single diverter ridge 3 is 5.2 mm, the tip protrusion height h1 of a single diverter ridge 3 is 1.1 mm, and the width d1 of a single diverter ridge 3 is 3.9 mm. The arc radius R1 of a single diverter ridge 3 and a diverter wall 4 is 10.0 mm, and the arc length L1 is 9.0 mm. The radius R2 of the combustion chamber pit 6 is 5.0 mm. The shortest distance d4 from the diverter wall 4 to the central axis of the combustion chamber 1 is 26.8 mm, and the longest distance d5 from the diverter wall 4 to the central axis of the combustion chamber 1 is 31.8 mm. The depth h2 of the recirculation zone 5 is 4.0 mm, and the width d2 is 12.0 mm. The smooth slope θ2 of the combustion chamber recess 6 close to the central axis of the combustion chamber 1 is 11 degrees.

[0042] The local operating conditions are set as follows: cylinder diameter is 95mm, compression ratio is 16.5, injection angle θ1 is 25 degrees, spray hole diameter is 0.150mm, and injection pressure is 180Mpa.

[0043] The combustion chamber is designed based on the above parameters of this embodiment. After simulation, the results show that the indicated thermal efficiency of the fuel four-flow combustion chamber system of this embodiment is improved by 2.3%, and the soot generation is reduced by 45.2%.

[0044] Embodiment 3:

[0045] In a preferred embodiment of the present invention, N is 8, that is, there are 8 spray holes at the lower end of the injector 2, and there are 8 diverter ridges 3 on the corresponding diverter wall 4, which are evenly distributed in the circumferential direction. The vertical projection height of a single diverter ridge 3 is 6.5 mm, the horizontal projection length of a single diverter ridge 3 is 4.8 mm, the tip protrusion height h1 of a single diverter ridge 3 is 1.0 mm, and the width d1 of a single diverter ridge 3 is 4.8 mm. The arc radius R1 of a single diverter ridge 3 and a diverter wall 4 is 9.6 mm, and the arc length L1 is 8.7 mm. The radius R2 of the combustion chamber pit 6 is 4.7 mm. The shortest distance d4 from the diverter wall 4 to the central axis of the combustion chamber 1 is 26.5 mm, and the longest distance d5 from the diverter wall 4 to the central axis of the combustion chamber 1 is 30.9 mm. The depth h2 of the recirculation zone 5 is 3.6 mm, and the width d2 is 10.5 mm. The smooth slope θ2 of the combustion chamber recess 6 close to the central axis of the combustion chamber 1 is 13 degrees.

[0046] The local operating conditions are set as follows: cylinder diameter is 95mm, compression ratio is 16.5, injection angle θ1 is 25 degrees, spray hole diameter is 0.150mm, and injection pressure is 180Mpa.

[0047] The combustion chamber is designed based on the above parameters of this embodiment. After simulation, the results show that the indicated thermal efficiency of the fuel four-flow combustion chamber system of this embodiment is improved by 1.8%, and the soot generation is reduced by 43.5%.

[0048] Embodiment 4:

[0049] In a preferred embodiment of the present invention, N is 8, that is, there are 8 spray holes at the lower end of the injector 2, and there are 8 diverter ridges 3 on the corresponding diverter wall 4, which are evenly distributed in the circumferential direction. The vertical projection height of a single diverter ridge 3 is 6.0 mm, the horizontal projection length of a single diverter ridge 3 is 4.4 mm, the tip protrusion height h1 of a single diverter ridge 3 is 0.9 mm, and the width d1 of a single diverter ridge 3 is 4.3 mm. The arc radius R1 of a single diverter ridge 3 and a diverter wall 4 is 9.2 mm, and the arc length L1 is 8.3 mm. The radius R2 of the combustion chamber pit 6 is 4.4 mm. The shortest distance d4 from the diverter wall 4 to the central axis of the combustion chamber 1 is 26.0 mm, and the longest distance d5 from the diverter wall 4 to the central axis of the combustion chamber 1 is 30.0 mm. The depth h2 of the recirculation zone 5 is 3.2 mm, and the width d2 is 9.0 mm. The smooth slope θ2 of the combustion chamber recess 6 close to the central axis of the combustion chamber 1 is 11 degrees.

[0050] The local operating conditions are set as follows: cylinder diameter = 95mm, compression ratio = 16.5, injection angle θ1 = 10 degrees, spray hole diameter = 0.125mm, injection pressure = 162Mpa.

[0051] The combustion chamber is designed based on the above parameters of this embodiment. After simulation, compared with the traditional combustion chamber system, the indicated thermal efficiency remains basically unchanged, and the soot production is reduced by 52.2%.

[0052] From the above embodiments, it can be seen that compared with the prior art, the four-division design of the fuel in the combustion chamber provided by the present invention can not only expand the distribution range of the oil beam in the radial and circumferential directions, but also enable the circumferentially diffused oil beam to be sucked into the combustion chamber cylinder after collision, and is easier to be fully mixed with the air in the combustion chamber, thereby improving the fuel and air mixing process, greatly improving the air utilization rate in the combustion chamber, and further improving the entire combustion process, improving combustion efficiency, and reducing fuel consumption and carbon soot emissions.

[0053] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A fuel four-flow diesel engine combustion chamber, characterized in that: The invention comprises a pit (6), a diverter wall (4) and a recirculation zone (5) arranged from bottom to top, wherein a plurality of diverter ridges (3) are arranged on the diverter wall (4), and a diverter point (10) is arranged on the diverter ridge (3) so as to form a first diverter zone (11) downwardly along the diverter ridge (3) and the pit (6), a second diverter zone (12) upwardly along the diverter ridge (3) and the recirculation zone (5), and a third diverter zone (13) and a fourth diverter zone (14) respectively formed along both sides of the diverter ridge (3) and the diverter wall (4).

2. A fuel four-flow diesel engine combustion chamber according to claim 1, characterized in that: One end of the flow dividing ridge (3) extends toward the reflow zone (5), and a flow blocking portion (15) is formed on one side of the reflow zone (5) to divide the second flow dividing zone (12) into a second swirling zone (121) located between the cylinder head (8) and the flow blocking portion (15), and a third swirling zone (122) located in the reflow zone (5) and corresponding to the position of the flow blocking portion (15).

3. A fuel four-flow diesel engine combustion chamber according to claim 1, characterized in that: The aspect ratio of the diverter ridge (3) is: d1 / h1=0.682*N-0.628; wherein d1 is the width of the diverter ridge (3), h1 is the protruding height of the diverter ridge (3), and N is the number of the diverter ridges (3).

4. A fuel four-flow diesel engine combustion chamber according to claim 3, characterized in that: The width d1 of the diverter ridge (3) is 3.8 to 5.4 mm; the protruding height h1 of the diverter ridge (3) is 0.9 to 1.1 mm.

5. A fuel four-flow diesel engine combustion chamber according to claim 1, characterized in that: The arc radius R1 of the diverter ridge (3) and the diverter wall (4) is consistent, and is 9.2 to 10.0 mm.

6. A fuel four-flow diesel engine combustion chamber according to claim 1, characterized in that: The arc length L1 of the diverter ridge (3) and the diverter wall (4) is consistent, and is 8.3 to 9.0 mm.

7. A fuel four-flow diesel engine combustion chamber according to claim 1, characterized in that: A fuel injector (2) is provided above the combustion chamber. The fuel injector (2) is provided with a plurality of fuel injection holes. The plurality of fuel injection holes correspond to a plurality of flow diversion ridges (3) one by one. The center line of each fuel injection hole faces the tip of the opposite flow diversion ridge (3), and the point where the two intersect is used as a flow diversion point (10).

8. A fuel four-flow diesel engine combustion chamber according to claim 7, characterized in that: The injection angle θ1 of the injector (2) is 10 to 25 degrees.

9. A fuel four-flow diesel engine combustion chamber according to claim 1, characterized in that: A middle convex block (16) is provided inside the concave pit (6), and a smooth slope θ2 of the middle convex block (16) is 11 to 16 degrees.

10. A fuel four-flow diesel engine combustion chamber according to claim 1, characterized in that: The depth h2 of the reflow zone (5) is 3.2-4.0 mm, and the width d2 is 9.0-12.0 mm.

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