Gasoline engine combustion chamber and automobile
阅读说明：本技术 汽油机燃烧室及汽车 (Gasoline engine combustion chamber and automobile ) 是由 罗招 郑建军 张恩源 袁园 于 2019-11-21 设计创作，主要内容包括：本发明公开了一种汽油机燃烧室及汽车,包括由燃烧室顶面和燃烧室底面E构成的燃烧室本体,在燃烧室顶面的前部设有两个排气孔,在燃烧室顶面的后部设有与所述两个排气孔一一对应的两个进气孔；所述燃烧室顶面在位于同一侧的排气孔和进气孔之间的位置均设有弧形曲面；所述燃烧室顶面在位于各弧形曲面的外侧均设有与燃烧室底面E相垂直的挤流面；且位于同一侧的弧形曲面与挤流面之间均设有斜导流面,该斜导流面从弧形曲面至挤流面方向向下倾斜。本发明能够改善因排气侧终端混合气在高温高压下自燃引发的爆震倾向。(The invention discloses a gasoline engine combustion chamber and an automobile, comprising a combustion chamber body consisting of a combustion chamber top surface and a combustion chamber bottom surface E, wherein the front part of the combustion chamber top surface is provided with two exhaust holes, and the rear part of the combustion chamber top surface is provided with two air inlets which are in one-to-one correspondence with the two exhaust holes; the top surface of the combustion chamber is provided with an arc-shaped curved surface at the position between the exhaust hole and the air inlet hole which are positioned on the same side; the top surface of the combustion chamber is provided with flow squeezing surfaces which are vertical to the bottom surface E of the combustion chamber at the outer sides of the arc-shaped curved surfaces; and inclined flow guide surfaces are arranged between the arc-shaped curved surface and the flow extruding surface which are positioned on the same side, and the inclined flow guide surfaces incline downwards from the arc-shaped curved surface to the flow extruding surface. The invention can improve the detonation tendency caused by the spontaneous combustion of the exhaust side terminal gas mixture at high temperature and high pressure.)
1. A combustion chamber of a gasoline engine comprises a combustion chamber body consisting of a combustion chamber top surface and a combustion chamber bottom surface E, wherein the front part of the combustion chamber top surface is provided with two exhaust holes (4), and the rear part of the combustion chamber top surface is provided with two air inlet holes (2) which are in one-to-one correspondence with the two exhaust holes (4); the method is characterized in that:
arc-shaped curved surfaces are arranged on the top surface of the combustion chamber between the exhaust hole (4) and the air inlet hole (2) which are positioned on the same side;
the top surface of the combustion chamber is provided with flow squeezing surfaces which are vertical to the bottom surface E of the combustion chamber at the outer sides of the arc-shaped curved surfaces;
and inclined flow guide surfaces are arranged between the arc-shaped curved surface and the flow extruding surface which are positioned on the same side, and the inclined flow guide surfaces incline downwards from the arc-shaped curved surface to the flow extruding surface.
2. The gasoline engine combustion chamber of claim 1, characterized in that: the inclined guide surface and the bottom surface E of the combustion chamber form an included angle of 53-57 degrees.
3. The combustion chamber of a gasoline engine according to claim 1 or 2, characterized in that: the curvature radius of the arc-shaped curved surface gradually transits from an initial arbitrary value between 6.5mm and 8mm to infinity from the direction from the air inlet hole (2) to the air outlet hole (4), and finally keeps parallel to the top surface D of the air outlet side.
4. The gasoline engine combustion chamber of claim 3, characterized in that: and the included angle between the exhaust side top surface D and the combustion chamber bottom surface E is between 20 and 23 degrees.
5. The combustion chamber of the gasoline engine as defined in claim 1, 2 or 4, wherein the squish surface is perpendicular to the combustion chamber bottom surface E, and the included angle α between the squish surface and the axis F is between 4 ° and 5 °.
6. The gasoline engine combustion chamber of claim 5, characterized in that: the maximum vertical distance H from the arc-shaped curved surface to the bottom surface E of the combustion chamber is between 13mm and 15 mm.
7. The gasoline engine combustion chamber of claim 5, characterized in that: the inclined flow guide surface is positioned between the exhaust hole (4) and the air inlet hole (2).
8. An automobile, characterized in that: a combustion chamber of a gasoline engine as defined in any one of claims 1 to 7.
Technical Field
The invention belongs to the technical field of automobile engines, and particularly relates to a gasoline engine combustion chamber and an automobile.
Background
In the face of more stringent emission and oil consumption regulation requirements and the challenge from the rapid development of new energy, how to further improve the thermal efficiency, improve the fuel economy and make the traditional power vehicle more competitive has become a hot spot of research in various major host plants. The quality of the combustion system is important for improving the thermal efficiency of the engine, the increase of the compression ratio is beneficial to improving the thermal efficiency, but the knocking tendency is increased along with the improvement of the compression ratio. Based on the combustion theory in the engine cylinder, the high turbulence intensity and the reasonable distribution thereof are beneficial to reducing the knocking risk, so that the structure of the combustion chamber needs to be finely designed.
Disclosure of Invention
The invention aims to provide a gasoline engine combustion chamber and an automobile, so as to achieve the purposes of enhancing the in-cylinder tumble flow and turbulence intensity, promoting the reasonable distribution of turbulent kinetic energy and improving the knocking tendency.
The invention relates to a gasoline engine combustion chamber, which comprises a combustion chamber body consisting of a combustion chamber top surface and a combustion chamber bottom surface E, wherein two exhaust holes are formed in the front part of the combustion chamber top surface, and two air inlets which are in one-to-one correspondence with the two exhaust holes are formed in the rear part of the combustion chamber top surface;
the top surface of the combustion chamber is provided with an arc-shaped curved surface at the position between the exhaust hole and the air inlet hole which are positioned on the same side;
the top surface of the combustion chamber is provided with flow squeezing surfaces which are vertical to the bottom surface E of the combustion chamber at the outer sides of the arc-shaped curved surfaces;
and inclined flow guide surfaces are arranged between the arc-shaped curved surface and the flow extruding surface which are positioned on the same side, and the inclined flow guide surfaces incline downwards from the arc-shaped curved surface to the flow extruding surface.
The inclined flow guide surface and the adjacent arc-shaped curved surface are additionally arranged on the top surface of the combustion chamber, so that the formation and the maintenance of tumble flow in the air inlet stage and the compression initial stage are facilitated, the movement of air flow to the exhaust side and the center of the spark plug is facilitated in the compression later stage, the conversion of the tumble flow to turbulent flow is promoted, the turbulence intensity in the cylinder is finally improved, and the high turbulence area is concentrated in the center of the spark plug and is slightly distributed on the exhaust side. According to the theory of combustion, the higher the turbulence intensity is, the faster the combustion speed is, the higher turbulence area is concentrated at the center of the spark plug and is slightly distributed on the exhaust side, so that the initial combustion speed is improved, and meanwhile, the time for the flame surface to spread to the terminal of the exhaust side is shortened, and the detonation tendency caused by the spontaneous combustion of the mixed gas at the terminal of the exhaust side under high temperature and high pressure is improved.
Furthermore, the included angle between the inclined guide surface and the bottom surface E of the combustion chamber is 53-57 degrees.
Furthermore, the curvature radius of the arc-shaped curved surface gradually transits from an initial arbitrary value between 6.5mm and 8mm to infinity from the direction from the air inlet hole to the air outlet hole, and finally keeps parallel to the top surface D of the air outlet side.
Furthermore, the included angle between the exhaust side top surface D and the combustion chamber bottom surface E is between 20 and 23 degrees.
Furthermore, the flow squeezing surface is vertical to the bottom surface E of the combustion chamber, and the included angle α between the flow squeezing surface and the axis F is between 4 and 5 degrees.
Further, the maximum vertical distance H from the arc-shaped curved surface to the bottom surface E of the combustion chamber is between 13mm and 15 mm.
Furthermore, the oblique flow guide surface is positioned between the exhaust hole and the air inlet hole.
The invention relates to an automobile, which adopts a gasoline engine combustion chamber.
The invention has the following advantages:
(1) the formation and the maintenance of tumble flow in the air inlet stage and the initial compression stage are facilitated;
(2) in the later stage of compression, the conversion of tumble flow to turbulent flow can be promoted, the in-cylinder turbulent flow level is improved, and the high-turbulent flow area is concentrated in the center of the spark plug and is slightly distributed on the exhaust side.
Drawings
FIG. 1 is an isometric view of the present invention;
FIG. 2 is a top view of the present invention;
FIG. 3 is a left side view of the present invention;
FIG. 4 is a right side view of the present invention;
FIG. 5 is a schematic diagram of the distribution of high turbulence in a cylinder at the time of top dead center before the optimization of the structure of a combustion chamber of a gasoline engine;
FIG. 6 is a schematic diagram of the distribution of high turbulence in the cylinder at the top dead center of the combustion chamber structure of the gasoline engine of the present invention;
in the figure, a 1-oil injector, a 2-air inlet hole, a 3-spark plug hole, a 4-air outlet hole, an A-1/A-2-inclined flow guide surface, a B-1/B-2-flow extrusion surface, a C-1/C-2-arc characteristic curved surface, a D-air exhaust side top surface, an E-combustion chamber bottom surface, an F-axis and an F' -axis are parallel lines.
Detailed Description
The invention will be further explained with reference to the drawings.
In the present embodiment, as shown in fig. 1 to 2, a combustion chamber of a gasoline engine includes a combustion chamber body composed of a combustion chamber top surface and a combustion chamber bottom surface E, two
In this embodiment, the top surface of the combustion chamber is provided with arc-shaped curved surfaces (i.e., an arc-shaped curved surface C-1 and an arc-shaped curved surface C-2) at positions between the
In this embodiment, the top surface of the combustion chamber is provided with flow squeezing surfaces (i.e., flow squeezing surface B-1 and flow squeezing surface B-2) perpendicular to the bottom surface E of the combustion chamber on the outer sides of the arc-shaped curved surfaces. As shown in FIG. 1, squish plane B-1 is located at the left portion of the combustion chamber body and squish plane B-2 is located at the right portion of the combustion chamber body.
In this embodiment, oblique flow guide surfaces (i.e., an oblique flow guide surface a-1 and an oblique flow guide surface a-2) are disposed between the arc-shaped curved surface and the flow extruding surface on the same side, the oblique flow guide surface a-1 is located at the left portion of the combustion chamber body, and the oblique flow guide surface a-1 is inclined downward from the arc-shaped curved surface C-1 to the flow extruding surface B-1. The inclined guide surface A-2 is positioned at the right part of the combustion chamber body, and the inclined guide surface A-2 inclines downwards from the arc-shaped curved surface C-2 to the flow extruding surface B-2.
In this embodiment, the inclined flow guide surface and the bottom surface E of the combustion chamber form an included angle of 53 ° to 57 °.
In the present embodiment, as shown in fig. 1, the radius of curvature of the curved surface gradually transitions from an arbitrary value between 6.5mm and 8mm initially to infinity in the direction from the
In the embodiment, the included angle between the exhaust side top surface D and the combustion chamber bottom surface E is between 20 and 23 degrees.
In this embodiment, as shown in fig. 2, the squish surface is perpendicular to the combustion chamber bottom surface E, and the included angle α between the squish surface and the axis F (the axis parallel line F' is parallel to the axis F) is between 4 ° and 5 °.
In this embodiment, as shown in fig. 3 and 4, the maximum vertical distance H from the curved surface to the combustion chamber bottom surface E is between 13mm and 15 mm.
In this embodiment, as shown in fig. 1 and 2, the inclined diversion surface is located between the
In the embodiment, the inclined guide surface and the arc-shaped curved surface formed by the parameters have a guiding function on the air flow in the cylinder in the air inlet stage and the compression initial stage, so that the formation and the maintenance of high tumble flow are promoted, the air flow is guided to move towards the exhaust side in the compression later stage, the inclined guide surface is favorable for tumble crushing to form turbulent flow, and the high turbulent flow is guided to the center of the spark plug and slightly deviates from the exhaust side. As shown in fig. 5 and 6, after the combustion chamber of the gasoline engine in the embodiment is adopted, the distribution of the high turbulence area in the cylinder is optimized from the distribution of the bias air inlet side in fig. 5 to the distribution of the bias air inlet side in fig. 6, and the distribution is concentrated at the center of the spark plug and slightly biased towards the exhaust side, so that the knocking tendency caused by the self-ignition of the terminal mixture at the exhaust side under high temperature and high pressure is improved.
In this embodiment, an automobile adopts the combustion chamber of the gasoline engine as described in this embodiment.
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