CN111502818A - Flow-guiding necking type gas engine combustion chamber - Google Patents

Flow-guiding necking type gas engine combustion chamber Download PDF

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Publication number
CN111502818A
CN111502818A CN202010351967.XA CN202010351967A CN111502818A CN 111502818 A CN111502818 A CN 111502818A CN 202010351967 A CN202010351967 A CN 202010351967A CN 111502818 A CN111502818 A CN 111502818A
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CN
China
Prior art keywords
throat
combustion chamber
flow
opening
gas engine
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Pending
Application number
CN202010351967.XA
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Chinese (zh)
Inventor
龚远飞
徐敏
吕昌富
陈欢
梁敏
余光建
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Dongfeng Commercial Vehicle Co Ltd
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Dongfeng Commercial Vehicle Co Ltd
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Publication date
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Priority to CN202010351967.XA priority Critical patent/CN111502818A/en
Publication of CN111502818A publication Critical patent/CN111502818A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/26—Pistons  having combustion chamber in piston head
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/28—Other pistons with specially-shaped head
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)

Abstract

The invention relates to the field of engines, in particular to a flow-guiding necking type gas engine combustion chamber. The combustion chamber of the flow-guiding necking gas engine comprises a combustion chamber, wherein the combustion chamber comprises an opening, a throat and a bottom surface; the laryngeal opening comprises a laryngeal opening upper edge, a laryngeal opening lower edge, an annular arc-shaped bulge and a laryngeal opening part; the combustion chamber is divided into a flow guide cavity at the upper layer and a combustion cavity at the lower layer by the plane where the throat opening part is located; the flow guide cavity is formed by enclosing flow guide side walls, and the flow guide side walls gradually extend outwards from the upper edge of the throat opening to the opening; the combustion cavity is formed by enclosing combustion side walls, and the combustion side walls gradually shrink inwards from the bottom surface to the lower edge of the throat opening to form a necking-type combustion cavity; the opening part of the throat opening is an oval flat bottom surface, and the bottom surface is a round flat bottom surface; or a flat bottom surface with a round throat opening part and an oval bottom surface. The piston combustion chamber can improve the intensity of turbulent kinetic energy and accelerate the combustion speed in the cylinder.

Description

Flow-guiding necking type gas engine combustion chamber
Technical Field
The invention relates to the field of engines, in particular to a flow-guiding necking type gas engine combustion chamber.
Background
At present, a gas engine piston combustion chamber is mainly a straight cylinder type piston combustion chamber, and the intake vortex and the compression vortex of the gas engine piston combustion chamber are weak, so that the combustion tumble and the turbulence intensity are low, the oil-gas mixing is insufficient, and the combustion quality is not ideal. In order to make the gas burn fast and fully in the combustion chamber, researchers try to increase the piston flow area by a necking mode, strengthen the flow in the cylinder, improve the turbulent kinetic energy, accelerate the combustion speed, for example, the utility model of China with the application number of 201520598758.X discloses a combustion chamber of a piston of a gas engine, the mouth part of a body is provided with a throat fillet protruding from the side wall of the body to the center of the body, so that the mouth part of the body forms a necking relative to the lower part, when the gas of the engine is burnt in the combustion chamber, guided by the fillet of the throat, after the fuel gas is sprayed to the bottom of the combustion chamber, the fuel gas is rolled by the arc-shaped concave pit at the bottom to cause a strong flow squeezing effect, but researchers find that the flow squeezing has no guiding effect when the piston moves to the top dead center, and the natural gas in the combustion chamber can not be effectively crushed, the strength is low, the turbulent kinetic energy level can not be improved, and the functions of increasing the turbulent kinetic energy in the cylinder and accelerating the combustion speed in a necking mode can not be fully exerted.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a combustion chamber of a flow-guiding necking type gas engine, which can improve the intensity of turbulent kinetic energy and accelerate the combustion speed in a cylinder.
In order to achieve the purpose, the guide flow necking type gas engine combustion chamber comprises a combustion chamber extending from the top surface of a piston to the interior of the piston, wherein the combustion chamber comprises an opening positioned on the top surface of the combustion chamber, a throat positioned in the middle of the combustion chamber and a bottom surface positioned at the bottom of the combustion chamber; the throat comprises a throat upper edge, a throat lower edge, an annular arc bulge and a throat opening part, wherein the throat upper edge and the throat lower edge are arranged along the axial direction, the annular arc bulge is in transition connection with the throat upper edge and the throat lower edge, and the throat opening part is arranged along the radial direction; the combustion chamber is divided into an upper layer of flow guide cavity and a lower layer of combustion cavity by the plane where the throat opening part is located; the flow guide cavity is formed by enclosing a flow guide side wall arranged between the opening and the upper edge of the throat, and the flow guide side wall gradually extends outwards from the upper edge of the throat to the opening; the combustion cavity is formed by enclosing a combustion side wall arranged between the lower edge of the throat and the bottom surface, and the combustion side wall gradually shrinks inwards from the bottom surface to the lower edge of the throat to form a necking-type combustion cavity; the opening part of the throat opening is oval and the bottom surface is round; or the opening part of the throat opening is a flat bottom surface with a circular shape and an elliptical bottom surface.
Preferably, the central axis of the combustion chamber coincides with the central axis of the piston.
Preferably, the center of the throat opening part and the center of the bottom surface are both on the central axis of the piston; when the opening part of the throat opening is in an oval shape, the major axis of the opening part is 1.2-4 times of the minor axis, and the diameter ratio of the bottom surface to the outer circumference of the piston is 1/3-3/4; when the bottom surface is in an elliptical shape, the major axis is 1.2 to 4 times the minor axis, and the diameter ratio of the throat opening to the outer circumference of the piston is 1/3 to 3/4.
Preferably, the longitudinal section of the side wall has a linear shape inclined from bottom to top toward the central axis of the piston.
As a preferred scheme, the combustion chamber further comprises a bottom surface transition arc in transition connection with the bottom edge of the side wall and the bottom edge, the longitudinal section of the bottom surface transition arc is in a round angle shape, and the radius of the round angle of the bottom surface transition arc is 10-100 mm.
Preferably, the longitudinal section of the annular arc-shaped protrusion is in a round angle shape, and the radius of the round angle of the annular arc-shaped protrusion is 5-30 mm.
Preferably, the longitudinal section of the flow guide side wall is in an inclined straight line shape, and the included angle between the flow guide side wall and the plane where the opening is located is 15-45 degrees.
Preferably, the longitudinal section of the flow guide side wall is in an arc curve shape protruding upwards.
Preferably, the longitudinal section of the flow guide side wall is in the shape of an arc curve which is concave downwards.
The invention has the advantages that: compared with the existing gas engine piston combustion chamber, the flow-guiding necking-type gas engine combustion chamber has the advantages that the flow-guiding necking-type gas engine combustion chamber is additionally provided with the flow-guiding cavity to guide extruded flow to directly flow into the combustion chamber, the turbulence intensity in the combustion chamber is improved, the combustion speed is accelerated, meanwhile, the shape of the opening part or the bottom surface of the throat opening is improved to guide large-scale flow to deviate from a motion track to form an impact effect, the proportion of the large-scale flow to be crushed to form turbulence is improved, the turbulence energy intensity in a cylinder is further improved.
Drawings
FIG. 1 is a schematic view showing a structure of a combustor of a flow-guide throat type gas engine in example 1;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
FIG. 4 is a schematic view showing the structure of a combustor of a flow-guided throat-type gas engine according to embodiment 2;
FIG. 5 is a top view of FIG. 4;
FIG. 6 is a cross-sectional view A-A of FIG. 5;
FIG. 7 is a schematic view showing the structure of a combustor of a flow-guided throat-type gas engine according to embodiment 3;
FIG. 8 is a top view of FIG. 7;
FIG. 9 is a cross-sectional view A-A of FIG. 8;
the components in the figures are numbered as follows: the combustion chamber comprises a piston 1, a combustion chamber 2, an opening 3, a throat 4, a throat upper edge 41, a throat lower edge 42, an annular arc-shaped bulge 43, a throat opening 44, a short shaft 44a, a long shaft 44b, a bottom surface 5, a bottom surface transition arc 6, a flow guide cavity 21, a flow guide side wall 211, a combustion cavity 22, a combustion side wall 221, an included angle theta and a piston central axis o.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings.
Examples
Referring to fig. 1, 2 and 3, the combustion chamber of the flow-guiding necking type gas engine of the present embodiment includes a combustion chamber 2 extending from the top surface of a piston 1 to the inside of the piston 1, the combustion chamber 2 includes an opening 3 at the top surface of the combustion chamber 2, a throat 4 at the middle of the combustion chamber 2, and a bottom surface 5 at the bottom of the combustion chamber 2, and the central axis of the combustion chamber 2 coincides with the piston central axis o. The throat 4 comprises a throat upper edge 41, a throat lower edge 42, an annular arc-shaped bulge 43 and a throat opening part 44, wherein the annular arc-shaped bulge 43 is used for transitionally connecting the throat upper edge 41 and the throat lower edge 42 along the axial direction of the throat 4, the throat opening part 44 is arranged along the radial direction of the throat, the longitudinal section of the annular arc-shaped bulge 43 is in a round angle shape, the round radius of the annular arc-shaped bulge 43 is 10mm, the shape of the throat opening part 44 is in a round shape, and the diameter of the throat opening part 44 is 1/2 of the diameter of the outer circumference of the piston 1; the plane of the throat opening part 44 divides the combustion chamber 2 into an upper diversion cavity 21 and a lower combustion cavity 22; the diversion cavity 21 is formed by a diversion side wall 211 arranged between the opening 3 and the upper edge 41 of the throat, and as shown in fig. 3, the diversion side wall 211 of the embodiment is in the shape of an inverted circular truncated cone side wall, the longitudinal section of the diversion side wall is in a linear shape inclined outwards from bottom to top, and an included angle theta between a plane where the longitudinal section of the diversion side wall 211 is located and a plane where the opening 3 is located is 30 degrees. The combustion chamber 22 is formed by enclosing a combustion side wall 221 arranged between the throat lower edge 42 and the bottom surface 5, the longitudinal section of the combustion side wall 221 is in a linear shape gradually inclining towards the direction of the central axis o of the piston from bottom to top, so that the upper part of the combustion chamber 22 is contracted inwards relative to the lower part to form a throat-shaped combustion chamber 22, the circumferential edge of the bottom part of the combustion side wall 221 is in transition connection with the circumferential edge of the bottom surface 5 through a bottom surface transition arc 6, the longitudinal section of the bottom surface transition arc 6 is in a round angle shape, the round corner radius of the bottom surface transition arc 6 is 50mm, the bottom surface 5 of the combustion chamber 2 is an oval flat bottom surface, the length of the long axis of the bottom surface is 2 times of the length of the short axis, as shown in the combination of fig. 2, the center of the throat opening 44 and the center of the bottom surface 5 are both.
Compare in traditional gas piston combustion chamber, the advantage that this embodiment water conservancy diversion throat type gas engine combustion chamber has:
the invention 1, the flow guide cavity is added to guide the extruded flow to directly flow into the combustion chamber, thereby improving the turbulence intensity in the combustion chamber and accelerating the combustion speed.
2, the invention designs the shape of the opening part of the throat opening into an ellipse and the shape of the bottom surface into a circle, so that the invention can guide the large-scale flow to deviate from the motion track to form an impact effect, improve the proportion of the large-scale flow to be broken into turbulent flow, improve the intensity of turbulent kinetic energy and accelerate the combustion speed in the cylinder.
3, the invention increases the piston flow squeezing area by a necking mode, improves the flow squeezing intensity in the cylinder, forms high-intensity turbulence by the flow squeezing and crushing in a small space, and improves the combustion speed.
Example 2
Referring to fig. 4, 5 and 6, the combustion chamber of the flow guide throat type gas engine of the present embodiment is different from embodiment 1 in that the throat opening 44 is elliptical in shape, the bottom surface is circular in shape, the major axis of the throat opening 44 is 2 times the minor axis, and the diameter ratio of the bottom surface 5 to the outer circumference of the piston 1 is 1/2; and the diameter of the bottom surface is larger than the length of the major axis of the laryngeal opening portion 44. In addition, the longitudinal section of the guide sidewall 211 is an arc-shaped curve shape protruding upward.
Example 3
Referring to fig. 7, 8 and 9, the combustion chamber of the flow guide throat type gas engine of the present embodiment is different from embodiment 1 in that the throat opening 44 is elliptical in shape, the bottom surface is circular in shape, the major axis of the throat opening 44 is 2 times the minor axis, and the diameter ratio of the bottom surface 5 to the outer circumference of the piston 1 is 1/2; and the diameter of the bottom surface is larger than the length of the major axis of the laryngeal opening portion 44. In addition, the longitudinal section of the flow guiding side wall 211 is an arc curve shape which is concave downwards.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (9)

1. A flow-guiding necking type gas engine combustion chamber comprises a combustion chamber (2) extending from the top surface of a piston (1) to the interior of the piston (1), wherein the combustion chamber (2) comprises an opening (3) positioned on the top surface of the combustion chamber (2), a throat (4) positioned in the middle of the combustion chamber (2) and a bottom surface (5) positioned at the bottom of the combustion chamber (2); the throat (4) comprises a throat upper edge (41), a throat lower edge (42) and an annular arc-shaped bulge (43) which is in transition connection with the throat upper edge (41) and the throat lower edge (42) along the axial direction, and a throat opening part (44) along the radial direction; the combustion chamber is characterized in that the combustion chamber (2) is divided into a flow guide cavity (21) at the upper layer and a combustion cavity (22) at the lower layer by a plane where the throat opening part (44) is located; the flow guide cavity (21) is formed by enclosing a flow guide side wall (211) arranged between the opening (3) and the upper edge (41) of the throat, and the flow guide side wall (211) gradually extends outwards from the upper edge (41) of the throat to the opening (3); the combustion cavity (22) is formed by enclosing a combustion side wall (221) arranged between the lower edge (42) of the throat and the bottom surface (5), and the combustion side wall (221) gradually shrinks inwards from the bottom surface (5) to the lower edge (42) of the throat to form a necking-type combustion cavity; the shape of the throat opening part (44) is an oval and the shape of the bottom surface (5) is a round flat bottom surface; or the throat opening part (44) is a flat bottom surface which is round in shape and the bottom surface (5) is oval in shape.
2. Flow-guiding necking gas engine combustion chamber according to claim 1, characterized in that the central axis of the combustion chamber (2) coincides with the piston central axis (o).
3. Flow-guiding throat-type gas engine combustion chamber according to claim 2, characterized in that the center of the throat opening (44) and the center of the bottom surface (5) are both on the piston central axis (o); when the throat opening part (44) is in an elliptical shape, the major axis is 1.2-4 times of the minor axis, and the diameter of the bottom surface (5) is 1/3-3/4 of the diameter of the outer circumference of the piston (1); when the bottom surface (5) is elliptical, the major axis is 1.2 to 4 times the minor axis, and the diameter of the throat opening (44) is 1/3 to 3/4 times the outer circumferential diameter of the piston (1).
4. Flow guiding necking gas engine combustion chamber according to claim 1 or 2, wherein the longitudinal section of the side wall (7) is a straight shape inclined from bottom to top towards the piston central axis (o).
5. The flow-guiding necking gas engine combustor according to claim 1 or 2, wherein the combustor (2) further comprises a bottom surface transition arc (6) for transitionally connecting the bottom edge of the side wall (7) and the edge of the bottom surface (5), the longitudinal section of the bottom surface transition arc (6) is in a fillet shape, and the fillet radius of the bottom surface transition arc (6) is 10-100 mm.
6. Flow guiding necking gas engine combustor according to claim 1 or 2, wherein the longitudinal section of the annular arc protrusion (43) is in the shape of a fillet, and the fillet radius of the annular arc protrusion (43) is 5-30 mm.
7. Flow-guiding necking gas engine combustor according to claim 1 or 2, characterized in that the longitudinal section of the flow-guiding sidewall (211) is in the shape of an inclined straight line, and the angle (θ) between the flow-guiding sidewall (211) and the plane of the opening (3) is 15 ° to 45 °.
8. Flow directing necking gas engine combustion chamber according to claim 1 or 2, characterized in that the longitudinal section of the flow directing side wall (211) is in the shape of an upwardly convex arc curve.
9. Flow directing throat gas engine combustion chamber according to claim 1 or 2, characterized in that the longitudinal section of the flow directing side wall (211) is in the shape of an arc curve that is concave downwards.
CN202010351967.XA 2020-04-28 2020-04-28 Flow-guiding necking type gas engine combustion chamber Pending CN111502818A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010351967.XA CN111502818A (en) 2020-04-28 2020-04-28 Flow-guiding necking type gas engine combustion chamber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010351967.XA CN111502818A (en) 2020-04-28 2020-04-28 Flow-guiding necking type gas engine combustion chamber

Publications (1)

Publication Number Publication Date
CN111502818A true CN111502818A (en) 2020-08-07

Family

ID=71866582

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010351967.XA Pending CN111502818A (en) 2020-04-28 2020-04-28 Flow-guiding necking type gas engine combustion chamber

Country Status (1)

Country Link
CN (1) CN111502818A (en)

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