Combustion system and diesel engine
By employing a dual tangential intake manifold with an arc-shaped channel design in the diesel engine combustion system, the problems of high intake manifold resistance and low combustion efficiency are solved, achieving efficient airflow and complete combustion.
Patent Information
- Application Number
- CN202520430296.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2035-03-12
AI Technical Summary
Existing diesel engines have high intake resistance, and when diesel fuel enters the combustion chamber in a jet state, there are local oxygen-rich and oxygen-deficient zones, resulting in low combustion efficiency.
The design employs an arc-shaped channel to form a dual tangential channel path. The airflow enters the second air intake tangentially along the intake channel, while another part of the airflow enters the first air intake tangentially along the arc-shaped channel. This reduces the airflow movement path, increases the intake volume, and weakens the vortex intensity.
By shortening the airflow path, reducing flow resistance, improving combustion efficiency, and promoting thorough mixing of diesel and air.
Smart Images
Figure CN223647938U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the diesel engine accessory technical field, especially to a combustion system and diesel engine. BACKGROUND
[0002] When the diesel engine is running, diesel in the diesel engine enters the combustion chamber in the form of oil jet through the oil injector for combustion, and the airflow movement in the cylinder of the diesel engine and the structure of the combustion chamber affect the combustion process of the diesel engine, for example, the intake airflow affects the flow field in the cylinder, and determines the airflow movement intensity and turbulence distribution of the oil injector position in the combustion chamber.
[0003] In the prior art, the intake passage is a spiral air passage and a tangential air passage, and the purpose is to form vortex around the axis in the cylinder to accelerate the mixing of fresh air and diesel spray.
[0004] However, the above-mentioned intake passage has large resistance, and in addition, diesel enters the combustion chamber in the form of oil jet, which exists local oxygen-rich and oxygen-poor area, cannot be fully combusted, and has low combustion efficiency. CONTENT OF THE INVENTION
[0005] The present application provides a combustion system and diesel engine to solve the problem of large resistance of the intake passage in the prior art, in addition, diesel enters the combustion chamber in the form of oil jet, which exists local oxygen-rich and oxygen-poor area, cannot be fully combusted, and has low combustion efficiency.
[0006] In order to achieve the above-mentioned purpose, the technical scheme of the present application is as follows:
[0007] On the one hand, the present application provides a combustion system, comprising: an intake structure, the intake structure comprising: an intake passage, the intake passage having a ventilation port and a second intake port, the second intake port being arranged away from the ventilation port; an arc-shaped passage having a first intake port, the intake passage being in communication with the arc-shaped passage, and part of the intake passage being tangent to the arc-shaped passage, the second intake port being located on one side of the arc-shaped passage and being tangent to the arc-shaped passage; the intake passage is configured to allow part of the airflow to enter the second intake port tangentially along the intake passage, and part of the airflow to enter the first intake port tangentially along the intake passage through the arc-shaped passage.
[0008] In one possible implementation, the combustion system in the embodiment of the present application further comprises a first flow guide portion and a second flow guide portion, the first flow guide portion and the second flow guide portion surrounding to form the arc-shaped passage;
[0009] One end of the first flow guide portion and one end of the second flow guide portion are tangent to the first intake port, the other end of the first flow guide portion is tangent to one end of the intake passage away from the second intake port, and the outer circumferential side of the other end of the second flow guide portion is tangent to the second intake port.
[0010] In one possible implementation, the combustion system in this application embodiment further includes a separator in the air intake structure. The separator is disposed in the air intake channel to divide the air intake channel into at least two sub-intake channels. One sub-intake channel is connected to the arc-shaped channel, and the other sub-intake channel is connected to the second air intake port.
[0011] In one possible implementation, in the combustion system of this application embodiment, the radius of the first guide section is 3 to 5 times the radius of the first air inlet 210, and the radius of the second guide section is 2 to 3 times the radius of the first air inlet.
[0012] In one possible implementation, the combustion system in this application embodiment has an arc-shaped first guide section and a second guide section, and the centers of the two sections are on the same straight line.
[0013] In one possible implementation, the combustion system in this application embodiment further includes a combustion structure, which includes a combustion chamber. A first air inlet and a second air inlet are both connected to the combustion chamber. The combustion chamber has a first combustion zone, a second combustion zone, and an oil distribution section. The first combustion zone and the second combustion zone are both located in the combustion chamber. The second combustion zone is connected to the first combustion zone and is located below the first combustion zone. The oil distribution section is located on the inner wall of the combustion chamber so that the oil jet entering the combustion chamber is diverted to the first combustion zone and the second combustion zone.
[0014] In one possible implementation, the combustion system in this application embodiment has a top surface, an upper swirling surface, an upper oil guiding surface, an oil distribution protrusion, a lower oil guiding arc surface, a lower oil guiding plane, a lower swirling surface, and a boss on the inner wall of the combustion chamber; the top surface, upper swirling surface, and upper oil guiding surface are sequentially arranged to enclose and form a first combustion zone; the lower oil guiding arc surface, lower oil guiding plane, lower swirling surface, and boss are sequentially arranged to enclose and form a second combustion zone; the oil distribution protrusion forms an oil distribution section to separate the second combustion zone from the first combustion zone; the top surface has an oil injection hole, and the oil jet ejected from the oil injection hole is correspondingly arranged with the oil distribution section.
[0015] In one possible implementation, the combustion system in this application embodiment has an axial height H2 of 3.5mm to 4.5mm, a radial height H3 of 2.5mm to 3.5mm, an angle β between the lower oil guide arc surface and the top surface of 114 of 5° to 10°, and an angle γ between the lower flow surface and the top surface 114 of 30° to 35°.
[0016] In one possible implementation, the combustion system in this application embodiment further includes a clearance combustion zone within the combustion chamber. The clearance combustion zone is located above the first combustion zone and extends outward from the center of the combustion chamber.
[0017] On the other hand, this application also improves a diesel engine, including a body and a combustion system of any of the above embodiments disposed on the body.
[0018] This application discloses a combustion system and a diesel engine. The combustion system incorporates an intake structure comprising: an intake passage having an inlet and a second intake, the second intake being positioned opposite to the inlet; and an arc-shaped passage having a first intake, the intake passage being connected to the arc-shaped passage and partially tangential to it; and a second intake located on one side of the arc-shaped passage and tangential to it. A portion of the airflow enters the second intake tangentially along the intake passage, while another portion enters the first intake tangentially along the intake passage and through the arc-shaped passage, forming a dual-tangential channel path. Compared to existing spiral channels, the tangential design of the arc-shaped channel shortens the airflow path, reduces airflow resistance, increases intake charge, and also acts as a tangential guide for the airflow, weakening vortex intensity, accelerating airflow velocity, and improving combustion efficiency. Attached Figure Description
[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.
[0020] Figure 1 This is a schematic diagram of the intake structure in the combustion system provided in the embodiments of this application;
[0021] Figure 2 This is a schematic diagram of the combustion structure in the combustion system provided in the embodiments of this application;
[0022] Figure 3 for Figure 2 Schematic diagram of the first and second combustion zones within the central combustion structure;
[0023] Figure 4 for Figure 2 Top view of the combustion structure;
[0024] Figure 5 A schematic diagram of the combustion effect in the combustion chamber of the combustion system provided in this application embodiment. Figure 1 ;
[0025] Figure 6 A schematic diagram of the combustion effect in the combustion chamber of the combustion system provided in this application embodiment. Figure 2 ;
[0026] Figure 7 This is a schematic diagram of the air intake structure in the prior art.
[0027] Explanation of reference numerals in the attached figures:
[0028] 10-Oil jet;
[0029] 100 - Combustion chamber; 101 - Inner wall surface;
[0030] 110 - First combustion zone; 111 - Upper flow surface; 112 - Upper oil guide surface; 113 - Oil distribution protrusion; 114 - Top surface;
[0031] 120 - Second combustion zone; 121 - Lower oil guide arc surface; 122 - Lower oil guide plane; 123 - Lower flow surface; 124 - Boss;
[0032] 130-Oil Distribution Section;
[0033] 140 - Residual combustion zone;
[0034] 200 - Arc-shaped channel; 210 - First air inlet; 221 - First air guide section; 222 - Second air guide section;
[0035] 300 - Air intake channel; 310 - Second air intake; 320 - Vent.
[0036] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation
[0037] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.
[0038] It should be noted that in the description of the embodiments of this application, the terms "upper", "lower", "inner", "outer" and other terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description, and are not intended to indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of this application.
[0039] Furthermore, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0040] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0041] When a diesel engine is running, diesel fuel enters the combustion chamber through the injector in the form of a fuel jet for combustion. The airflow movement inside the cylinder and the structure of the combustion chamber affect the combustion process of the diesel engine. For example, the intake airflow affects the flow field inside the cylinder, which determines the intensity of airflow movement and turbulence distribution at the position of the injector in the combustion chamber.
[0042] In existing technology, the intake manifold consists of a spiral intake manifold and a tangential intake manifold. The purpose of this design is to create a vortex moving around the cylinder axis, accelerating the mixing of fresh air and diesel spray. Figure 7 As shown. However, the above-mentioned intake passage has relatively high resistance, and the diesel fuel enters the combustion chamber in a jet state through the injector, resulting in local oxygen-rich and oxygen-deficient zones, which cannot be fully burned and have low combustion efficiency.
[0043] In view of this, this application provides a combustion system and a diesel engine. The combustion system includes: an intake structure, which includes: an intake passage having an air inlet and a second intake port, the second intake port being disposed opposite to the air inlet; and an arc-shaped passage having a first intake port, the intake passage being connected to the arc-shaped passage and part of the intake passage being tangential to the arc-shaped passage, the second intake port being located on one side of the arc-shaped passage and tangential to it. Part of the airflow enters the second intake port tangentially along the intake passage, while another part of the airflow enters the first intake port tangentially along the intake passage and through the arc-shaped passage, forming a dual-tangential passage path. Compared to existing spiral passages, the tangential design of the arc-shaped passage shortens the airflow path, reduces airflow resistance, increases intake charge, and also acts as a tangential guide for the airflow, weakening vortex intensity, accelerating airflow velocity, and improving combustion efficiency.
[0044] The following is combined Figures 1 to 6 The present application will be described in detail with reference to specific embodiments.
[0045] On one hand, this application provides a combustion system, including: an air intake structure, the air intake structure including: an air intake passage 300, the air intake passage 300 having a vent 320 and a second air intake 310, the second air intake 310 being disposed away from the vent 320; an arc-shaped passage 200, the arc-shaped passage 200 having a first air intake 210, the air intake passage 300 communicating with the arc-shaped passage 200, and a portion of the air intake passage 300 being tangential to the arc-shaped passage 200, the second air intake 310 being located on one side of the arc-shaped passage 200 and being tangential to the arc-shaped passage 200; the air intake passage 300 is configured such that a portion of the airflow enters the second air intake 310 tangentially along the air intake passage 300, and a portion of the airflow enters the first air intake 210 tangentially along the air intake passage 300 and through the arc-shaped passage 200.
[0046] The intake passage 300 includes a first passage and a second passage, which are connected. The first passage is connected to the first air intake 210 through the arc-shaped passage 200, and the second passage is connected to the second air intake 310. The second passage is a tangential passage, and the first passage is a straight passage, which is tangential to the arc-shaped passage 200.
[0047] The intake passage 300 has an intake end face, and the vent 320 is located on the intake end face. The arc-shaped passage 200 is a tangential passage. For example, the arc-shaped passage 200 is the first tangential air passage, and the second passage is the second tangential air passage. The first fresh charge (such as air) enters from the intake end face and is divided into two airflows, which flow along the first tangential air passage and the second tangential air passage respectively to the first intake port 210 and the second intake port 310, and enter the cylinder from the two intake ports. It should be noted that the airflow state formed by the fresh charge in the intake passage affects the airflow intensity entering the cylinder, and thus affects the air-diesel mixing, thereby affecting combustion. In this application, the arc-shaped passage 200 is a tangential passage, which, compared with the existing spiral passage, shortens the airflow path, reduces airflow resistance, increases the intake charge, and also acts as a tangential guide for the airflow, weakens the vortex intensity, and accelerates the airflow velocity.
[0048] In the combustion system of this application embodiment, part of the airflow enters the second air intake 310 tangentially along the air intake channel 300, and another part of the airflow enters the first air intake 210 tangentially along the air intake channel 300 through the arc-shaped channel 200, forming a double tangential channel. Compared with the existing spiral channel, the tangential design of the arc-shaped channel 200 shortens the airflow path, reduces airflow resistance, increases the intake charge, and also plays a tangential guiding role for the airflow, weakens the vortex intensity, accelerates the airflow velocity, and improves the combustion efficiency.
[0049] In one possible implementation, the combustion system in this application embodiment further includes a first guide section 221 and a second guide section 222 in the air intake structure. The first guide section 221 and the second guide section 222 surround and form an arc-shaped channel 200. One end of the first guide section 221 and one end of the second guide section 222 are both tangent to the first air intake 210. The other end of the first guide section 221 is tangent to the end of the air intake channel 300 away from the second air intake 310. The outer periphery of the other end of the second guide section 222 is tangent to the second air intake 310.
[0050] The arc-shaped channel 200 is connected to the second channel. The intake channel 300 has a diversion port at the connection point with the arc-shaped channel 200. The diversion port is located on one side of the second intake port 310 and is flush with the second intake port 310.
[0051] The fresh charge enters through the air vent 320 of the intake passage 300 and is divided into two airflows, which flow along the first passage and the second passage to the first air intake 210 and the second air intake 310, respectively, and enter the cylinder from the two air intakes. The airflow state formed by the fresh charge in the intake passage 300 affects the intensity of the airflow entering the cylinder, which in turn affects the mixing of air and diesel, and thus affects combustion.
[0052] The first guide section 221 has an arc-shaped guide surface, which is disposed inside the arc-shaped channel 200 and away from the second air inlet 310. The air inlet channel 300 has a straight guide surface inside, which is tangent to the arc-shaped guide surface. The center of the arc-shaped guide surface is located on the side of the arc-shaped channel 200 facing the second air inlet 310, and the arc-shaped guide surface is also tangent to the second air inlet 310.
[0053] The second guide section 222 also has an arc-shaped guide surface, which is disposed inside the arc-shaped channel 200 and faces the second air inlet 310. The arc-shaped guide surface is tangent to both the first air inlet 210 and the second air inlet 310. The center of the arc-shaped guide surface of the first guide section 221 and the center of the arc-shaped guide surface of the second guide section 222 are in the same direction.
[0054] In one possible implementation, the combustion system in this application embodiment further includes a separator in the air intake structure. The separator is disposed in the air intake channel 300 to divide the air intake channel 300 into at least two sub-intake channels. One sub-intake channel is connected to the arc-shaped channel 200, and the other sub-intake channel is connected to the second air intake port 310.
[0055] Specifically, the separator can also separate the first and second channels of the dual tangential air intake channel 300, dividing the air intake end face into two end faces to form two air vents, reducing the interference between the two airflows. That is, the first and second channels are not connected, reducing the interference between the two airflows.
[0056] In addition, the two air inlets can be arranged parallel to the air inlet end face, with the second air inlet 310 arranged to the left of the first air inlet 210, shortening the airflow path and reducing resistance, thereby increasing the intake volume.
[0057] In other embodiments, a heat-insulating coating may be applied to the inner wall of the intake duct and the inner wall of the combustion chamber 100 to reduce heat loss.
[0058] The radius of the first guide section 221 is 3 to 5 times the radius of the first air inlet 210, and the radius of the second guide section 222 is 2 to 3 times the radius of the first air inlet 210.
[0059] Furthermore, the inlet throat L1 connecting the intake passage 300 and the arc-shaped passage 200 is 0.8R to R. R is the radius of the air inlet 320 of the intake passage 300.
[0060] In one possible implementation, the combustion system in this application embodiment has an arc-shaped first guide section 221 and a second guide section 222, and the centers of the two sections are on the same straight line.
[0061] The first guide section 221 and the second guide section 222 are both arc-shaped. The first guide section 221 and the second guide section 222 surround the arc-shaped channel 200 to form a tangential channel, which is tangential to the intake channel 300.
[0062] The first guide section 221 and the second guide section 222 shorten the airflow path and increase the intake volume by reducing the airflow resistance.
[0063] In one possible implementation, the combustion system in this application embodiment further includes a combustion structure, which includes a combustion chamber 100. The combustion chamber 100 has a first combustion zone 110, a second combustion zone 120, and an oil distribution section 130. The second combustion zone 120 is connected to the first combustion zone 110 and is located below the first combustion zone 110. The first air inlet 210 and the second air inlet 310 are both connected to the combustion chamber 100. The oil distribution section 130 is disposed on the inner wall of the combustion chamber 100 so that the oil jet 10 entering the combustion chamber 100 is diverted to the first combustion zone 110 and the second combustion zone 120.
[0064] Specifically, the combustion chamber 100 has a combustion cavity, which is divided into a first combustion zone 110 and a second combustion zone 120. The second combustion zone 120 communicates with the first combustion zone 110 and is located below the first combustion zone 110. The oil separator 130 is located between the second combustion zone 120 and the first combustion zone 110. The oil separator 130 is disposed on the inner wall of the combustion chamber.
[0065] The combustion chamber 100 has a top surface 114, an upper flow surface 111, an upper oil guide surface 112, an oil distribution protrusion 113, a lower oil guide arc surface 121, a lower oil guide plane 122, a lower flow surface 123, and a boss 124 on its inner wall. The top surface 114, the upper flow surface 111, and the upper oil guide surface 112 are arranged in sequence to form a first combustion zone 110. The lower oil guide arc surface 121, the lower oil guide plane 122, the lower flow surface 123, and the boss 124 are arranged in sequence to form a second combustion zone 120. The oil distribution protrusion 113 forms an oil distribution section 130 to separate the second combustion zone 120 from the first combustion zone 110. The top surface 114 has an oil injection hole, and the oil jet 10 ejected from the oil injection hole is correspondingly arranged with the oil distribution section 130.
[0066] When the fuel jet 10 enters the combustion chamber 100 and collides with the fuel distribution protrusion 113, it is divided into upper and lower fuel jets. The upper fuel jet, along the upper fuel guide surface 112, is guided by the upper flow surface 111 to fully mix with air in the first combustion zone 110. The lower fuel jet, along the lower fuel guide plane 122 and the lower fuel guide arc surface 121, is guided by the lower flow surface 123 to fully mix with air in the second combustion zone 120. Furthermore, the fuel distribution protrusion 113 can form small vortices in the radial direction of the fuel jet 10, making full use of air and promoting thorough mixing of diesel and air.
[0067] The combustion chamber 100 can compensate for the disadvantage of low swirl intensity in the dual tangential intake ports. The dual tangential intake ports are matched with the strong mixing combustion chamber 100, which reduces the intake flow resistance, increases the fresh charge flow coefficient, and ensures the swirl intensity in the cylinder, which is conducive to the full mixing of diesel and air.
[0068] The oil separator protrusion 113 enhances air utilization and promotes oil-air mixing through radial and axial vortices; the lower oil guide plane 122 guides the lower oil jet deep into the center of the combustion chamber 100, expanding the swirling area; the clearance combustion zone 140 is located above the first combustion zone 110 and extends outward to optimize the treatment of combustion residue gases; the dual tangential intake port matching reduces intake resistance, increases the flow coefficient, maintains the in-cylinder vortex intensity, and compensates for the insufficient mixing defects of traditional solutions.
[0069] In addition, the oil distribution protrusions 113 are spaced apart on the inner wall surface 101. The number of oil distribution protrusions 113 is the same as the number of oil injection holes of the injector, and their positions on the inner wall surface 101 correspond to the oil jets 10 ejected from the oil injection holes.
[0070] In other embodiments, the axial height H2 of the oil separator 130 is 3.5mm to 4.5mm, and the oil separator 130 forms small vortices in the axial direction of the oil jet, making full use of air. The radial height H3 of the oil separator 130 is 2.5mm to 3.5mm, which can also form small vortices in the radial direction of the oil jet, making full use of air.
[0071] The angle β between the lower oil guiding arc surface 121 and the top surface 114 is 5° to 10°, and the angle γ between the lower flow surface 123 and the top surface 114 is 30° to 35°. The lower oil jet is guided by the lower flow surface 123 to form a vortex in the second combustion zone 120 so as to fully mix with the air. The starting point of the lower oil guiding plane 122 is tangent to the lowest point of the lower oil guiding arc surface 121, so that the lower oil jet spreads along the lower wall surface and penetrates deeper into the center of the combustion chamber 100.
[0072] The diameter D1 of the inner wall surface 101 of the combustion chamber 100 is approximately 0.5D, where D is the cylinder diameter. The radius R3 of the inner wall surface 101 can be 3mm to 7mm.
[0073] The height H1 of the inner wall surface 101 from the top surface 114 is 0.5D1*tanα, where α is the angle between the oil jet 10 and the top surface 114.
[0074] In one possible implementation, the combustion system in this application embodiment further includes a clearance combustion zone 140 within the combustion chamber 100. The clearance combustion zone 140 is located above the first combustion zone 110 and extends outward from the center of the combustion chamber 100.
[0075] The clearance combustion zone 140 can be formed by a stepped recessed structure at the top of the combustion chamber 100, with a portion of the top surface 114 disposed within the clearance combustion zone 140. The clearance combustion zone 140 is located above the first combustion zone 110 and extends outward from the center of the combustion chamber 100. It is understood that a velocity gradient field is formed between the clearance combustion zone 140 and the first combustion zone 110, increasing the turbulence intensity of the airflow and promoting the secondary oxidation and combustion of unburned hydrocarbons.
[0076] On the other hand, this application also improves a diesel engine, including a body and a combustion system of any of the above embodiments disposed on the body.
[0077] This application does not limit the structure and type of diesel engine. For example, the diesel engine can be a high-speed diesel engine, a medium-speed diesel engine, or a low-speed diesel engine.
[0078] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.
[0079] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.
Claims
1. A combustion system, characterized in that, include: The intake structure includes: An air intake channel (300) has an air inlet (320) and a second air inlet (310), the second air inlet (310) being disposed away from the air inlet (320); An arc-shaped channel (200) has a first air inlet (210), an air inlet channel (300) communicates with the arc-shaped channel (200), and a portion of the air inlet channel (300) is tangent to the arc-shaped channel (200). A second air inlet (310) is located on one side of the arc-shaped channel (200) and is tangent to the arc-shaped channel (200). The air intake channel (300) is configured such that a portion of the airflow enters the second air intake (310) tangentially along the air intake channel (300), and a portion of the airflow enters the first air intake (210) tangentially along the air intake channel (300) through the arc-shaped channel (200).
2. The combustion system according to claim 1, characterized in that, The air intake structure further includes a first guide section (221) and a second guide section (222), the first guide section (221) and the second guide section (222) forming the arc-shaped channel (200); One end of the first guide section (221) and one end of the second guide section (222) are both tangent to the first air inlet (210). The other end of the first guide section (221) is tangent to the end of the air intake channel (300) away from the second air inlet (310). The outer periphery of the other end of the second guide section (222) is tangent to the second air inlet (310).
3. The combustion system according to claim 2, characterized in that, The air intake structure also includes a separator disposed within the air intake channel (300) to divide the air intake channel (300) into at least two sub-air intake channels. One sub-air intake channel is connected to the arc-shaped channel (200), and the other sub-air intake channel is connected to the second air intake port (310).
4. The combustion system according to claim 3, characterized in that, The radius of the first guide section (221) is 3 to 5 times the radius of the first air inlet (210), and the radius of the second guide section (222) is 2 to 3 times the radius of the first air inlet (210).
5. The combustion system according to any one of claims 2-4, characterized in that, Both the first guide section (221) and the second guide section (222) are arc-shaped, and their centers are on the same straight line.
6. The combustion system according to any one of claims 1-4, characterized in that, It also includes a combustion structure, which includes a combustion chamber (100) having a first combustion zone (110), a second combustion zone (120), and an oil distribution section (130). The first combustion zone (110) and the second combustion zone (120) are both located in the combustion chamber (100). The second combustion zone (120) communicates with the first combustion zone (110) and is located below the first combustion zone (110). The oil distribution section (130) is located on the inner wall of the combustion chamber (100) so that the oil jet (10) entering the combustion chamber (100) is diverted to the first combustion zone (110) and the second combustion zone (120). The first air inlet (210) and the second air inlet (310) are both connected to the combustion chamber (100).
7. The combustion system according to claim 6, characterized in that, The inner wall of the combustion chamber (100) has a top surface (114), an upper swirling surface (111), an upper oil guiding surface (112), an oil distribution protrusion (113), a lower oil guiding arc surface (121), a lower oil guiding plane surface (122), a lower swirling surface (123), and a boss (124). The top surface (114), the upper flow surface (111), and the upper oil guiding surface (112) are arranged in sequence to enclose and form the first combustion zone (110); The lower oil guiding arc surface (121), the lower oil guiding plane surface (122), the lower flow surface (123), and the boss (124) are arranged in sequence to enclose and form the second combustion zone (120); The oil-separating protrusion (113) forms the oil-separating section (130) to separate the second combustion zone (120) from the first combustion zone (110); The top surface (114) has an oil spray hole, and the oil jet (10) sprayed from the oil spray hole is correspondingly arranged with the oil distribution part (130).
8. The combustion system according to claim 7, characterized in that, The axial height H2 of the oil distribution section (130) is 3.5mm to 4.5mm, the radial height H3 is 2.5mm to 3.5mm, the angle β between the lower oil guide arc surface (121) and the top surface (114) is 5° to 10°, and the angle γ between the lower flow surface (123) and the top surface (114) is 30° to 35°.
9. The combustion system according to claim 7 or 8, characterized in that, The combustion chamber (100) is further provided with a clearance combustion zone (140), which is located above the first combustion zone (110) and extends outward away from the center of the combustion chamber (100).
10. A diesel engine, characterized in that, It includes a body and a combustion system as described in any one of claims 1-9 disposed on the body.