CN114239164A - Diesel engine in-cylinder combustion analysis model establishing method - Google Patents

Diesel engine in-cylinder combustion analysis model establishing method Download PDF

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CN114239164A
CN114239164A CN202111497161.2A CN202111497161A CN114239164A CN 114239164 A CN114239164 A CN 114239164A CN 202111497161 A CN202111497161 A CN 202111497161A CN 114239164 A CN114239164 A CN 114239164A
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piston
cylinder
volume
stroke volume
engine
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程建德
龚作伟
王勇
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Dongfeng Cummins Engine Co Ltd
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Dongfeng Cummins Engine Co Ltd
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Abstract

The invention relates to the technical field of engines, in particular to a method for establishing a diesel engine in-cylinder combustion analysis model. Simplifying the top clearance structure of the closed combustion chamber into a top inclined top structure with consistent volume; taking the volume of a combustion chamber formed by the top of the piston and the bottom of a cylinder cover when the piston of the engine is at a bottom dead center as a stroke volume; extracting an annular gap structure formed by a piston, a piston ring and a cylinder sleeve at the lower part of the stroke volume to form a piston annular gap, wherein the size of the outer diameter of the piston annular gap is equal to that of the outer diameter of the stroke volume; extracting a piston bowl shape at the lower part of the stroke volume, wherein the center line of the piston bowl shape is superposed with the stroke volume; and according to the axis of the piston, completing the assembly of a top inclined top structure, a stroke volume, a piston annular space and a piston bowl shape to form a combustion analysis model. A combustion chamber model is constructed by adopting a top inclined top structure, a stroke volume, a piston annular gap and a piston bowl-shaped component, and the method is suitable for quickly performing in-cylinder combustion simulation analysis under the condition of ensuring the accuracy of a prediction result.

Description

Diesel engine in-cylinder combustion analysis model establishing method
Technical Field
The invention relates to the technical field of engines, in particular to a method for establishing a diesel engine in-cylinder combustion analysis model.
Background
At present, the diesel engine faces the consideration of the aspects of emission regulation upgrading, power torque increasing, fuel economy regulation upgrading and the like, and the in-cylinder combustion efficiency needs to be continuously optimized.
The method can be used for quickly carrying out combined type selection of the fuel injector and the piston bowl shape by an in-cylinder combustion simulation analysis method, and meanwhile, the influences on in-cylinder combustion efficiency, emission and economy when boundary conditions such as a compression ratio, an air intake condition, a vortex ratio and the like are changed can be considered.
Most of the existing combustion analysis model building methods are integral model building methods, and the combustion chamber model is narrow in part structure, difficult to perform structured grid division and needing to be simplified or ignored; the calculation time is long due to the adoption of the integral model calculation, and the neglected structure influences the calculation result; it is therefore desirable to build a combustion chamber model that is suitable for performing rapid in-cylinder combustion simulation analysis and that does not impact the combined evaluation of performance.
Disclosure of Invention
The invention aims to provide a diesel engine in-cylinder combustion analysis model establishing method aiming at the defects of the prior art, which is suitable for performing rapid in-cylinder combustion simulation analysis and does not influence the combined evaluation of performance components.
The technical scheme of the invention is as follows: simplifying the top clearance structure of the closed combustion chamber into a top inclined top structure with consistent volume;
taking the volume of a combustion chamber formed by the top of the piston and the bottom of a cylinder cover when the piston of the engine is at a bottom dead center as a stroke volume;
extracting an annular gap structure formed by a piston, a piston ring and a cylinder sleeve at the lower part of the stroke volume to form a piston annular gap, wherein the size of the outer diameter of the piston annular gap is equal to that of the outer diameter of the stroke volume;
extracting a piston bowl shape at the lower part of the stroke volume, wherein the center line of the piston bowl shape is superposed with the stroke volume;
and according to the axis of the piston, completing the assembly of a top inclined top structure, a stroke volume, a piston annular space and a piston bowl shape to form a combustion analysis model.
Comparatively preferred, the top pushes up the structure to one side of structure orientation central line for being used for connecting upper surface and inclined plane of lower surface, the border of upper surface is greater than the border of lower surface apart from the distance of central line.
Preferably, the simplification of the closed combustion chamber top clearance structure into a top pitched roof structure with consistent volume comprises the following steps:
installing an engine cylinder body, a cylinder cover, an air inlet/outlet valve, an air valve guide pipe, a cylinder gasket, a cylinder sleeve, a piston and an oil injector according to actual assembling positions;
the thickness of the cylinder gasket is guaranteed to be the height after compression, the air inlet and outlet valves are in a closed state, and the piston is located at the top dead center position of the engine;
extracting a top structure of a closed combustion chamber formed in an engine cylinder body, and calculating a volume V of the top structure of the closed combustion chamberClearance；
Simplifying the top structure of the closed combustion chamber into volume and VClearanceEqual top pitched roof construction.
Preferably, the simplified formula of the top pitched roof structure is as follows:
L_1＝(1/a*i)*(K_1+K_2+K_3+……K_i)；
L_2＝(1/a*i)*(S_1+S_2+S_3+……S_i)；
K_i＝S_i-R_i；
V＝π*H_1*[(D/2)^2-(L_2*L_2+L_1*L_1+L_1*L_2)/3]；
V＝Vclearance；
Wherein i is the number of the valves, S _ i is the radial distance between the center line of the ith valve and the center line of the cylinder, K _ i is the radial distance between the inner edge of the ith valve and the center line of the cylinder, R _ i is the radius of the ith valve, D is the diameter of the engine cylinder, H _1 is the height of the top pitched roof structure, a is a volume compensation coefficient, V is the volume of the top pitched roof structure, L _1 is the distance between the edge of the lower surface of the top pitched roof structure and the center line, and L _2 is the distance between the edge of the upper surface of the top pitched roof structure and the center line.
Preferably, the stroke volume is represented by the formula VPunching machinePi ^2 ^ L (D/2) where L is the engine stroke and D is the engine cylinder diameter.
Preferably, the extracting of the piston annular space includes:
installing an engine cylinder body, a cylinder gasket, a cylinder sleeve, a piston and a piston ring according to actual assembly positions;
ensuring that the piston is at the top dead center position of the engine and the piston ring is in a compression state after installation;
extracting the annular gap structure formed by the piston, the piston ring and the cylinder sleeve, and calculating the volume V of the annular gap structureAnnular space；
Simplifying the annular space structure into volume and VAnnular spaceEqual piston annular clearance.
Preferably, the piston annular gap is located at the lower part of the stroke volume, the central line of the piston annular gap is overlapped with the stroke volume, the outer edge of the piston annular gap is flush with the outer edge of the stroke volume, the piston annular gap is provided with an upper surface and a lower surface which are parallel to each other, one side of the piston annular gap, which faces the central line, is an inclined plane used for connecting the upper surface and the lower surface, and the distance from the edge of the upper surface to the central line is smaller than that from the edge of the lower surface to the central line.
Preferably, the simplified formula of the piston annular clearance is as follows:
V＝π*H_2*[(D/2)^2-[(D/2-L_4)^2+(D/2-L_3)^2+(D/2-L_3)*
D/2-L_4)]/3]；
V＝Vannular space；
Wherein, H _2 is the height of the piston ring gap, L _3 is the distance from the edge of the upper surface of the piston ring gap to the central line, and L _4 is the distance from the edge of the lower surface of the piston ring gap to the central line.
Preferably, the extracting of the piston bowl shape comprises:
based on the actual structure of the engine, extracting the piston with the valve avoiding pit after removing the valve avoiding pit;
and for the piston without the valve avoiding pit, directly extracting.
Preferably, after the top pitched roof structure, the stroke volume, the piston annular space and the piston bowl are assembled according to the axis of the piston, the method further comprises the step of cutting the combustion analysis model to form a fan-shaped structure, wherein an included angle alpha of the fan-shaped structure is 360 degrees/n, and n is the number of the spray holes.
The invention has the beneficial effects that: a combustion chamber model is constructed by adopting a top inclined top structure, a stroke volume, a piston annular gap and a piston bowl-shaped component, and the problem of establishing the combustion chamber model suitable for rapid calculation of in-cylinder combustion simulation analysis is solved. The method ensures the consistency of the compression ratio of the combustion chamber and the actual compression ratio, and ensures that the maximum explosion pressure in the cylinder is not influenced; the consistency of the bowl shape and the actual structure is ensured, the consistency of oil jet and gas flow direction and the actual structure in analysis can be ensured, and the consistency of combustion flame distribution and the actual structure is ensured; the piston annular gaps are simplified in structure according to the actual annular gap structure of the engine, and the simulation accuracy of the generation of soot and unburned hydrocarbon of the piston annular gaps is not influenced; the volume of the cylinder cover air valve and the volume of the valve avoiding pit are simplified into the isometric pitched roof structure, so that the grids of the combustion chamber are easier to divide under the condition of not influencing the calculation precision, the influence of the narrow volume is reduced, and the calculation speed is accelerated. The combustion chamber model adopts a fan-shaped structure, so that the number of grids can be reduced, and the calculation time is shortened.
Drawings
FIG. 1 is a schematic view of a combustion analysis model according to the present invention;
FIG. 2 is a sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic view of the top pitched roof structure of the present invention;
FIG. 4 is a schematic diagram of a piston ring gap structure according to the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating 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 the present application, "a plurality" means two or more unless specifically limited otherwise.
Example one
Fig. 1 shows a schematic structural diagram of an in-cylinder combustion analysis model of a diesel engine provided in a preferred embodiment of the present application (fig. 1 shows a first embodiment of the present application), and for convenience of description, only the parts related to the present embodiment are shown, and detailed description is as follows:
as shown in FIG. 1, the combustion analysis model structure of the scheme is composed of a top inclined top structure 1, a stroke volume 2, a piston annular space 3 and a piston bowl shape 4.
As shown in fig. 2, the combustion chamber model adopts a fan-shaped structure, which is calculated as follows:
the fan-shaped angle of the combustion chamber model is calculated according to the hole number distribution of the oil injector, and the angle alpha shown in figure 2 is the fan-shaped angle:
α＝360°/n
wherein: n is the number of spray holes.
The construction process of the combustion analysis model comprises the following steps:
constructing a top pitched roof structure 1: simplifying the top clearance structure of the closed combustion chamber into a top inclined top structure with consistent volume;
build stroke volume 2: taking the volume of a combustion chamber formed by the top of the piston and the bottom of a cylinder cover when the piston of the engine is at a bottom dead center as a stroke volume;
constructing a piston annular space 3: extracting an annular gap structure formed by a piston, a piston ring and a cylinder sleeve at the lower part of the stroke volume to form a piston annular gap, wherein the size of the outer diameter of the piston annular gap is equal to that of the outer diameter of the stroke volume;
constructing a piston bowl 4: extracting a piston bowl shape at the lower part of the stroke volume, wherein the center line of the piston bowl shape is superposed with the stroke volume;
according to the piston axis, after the assembly of the top inclined top structure, the stroke volume, the piston annular space and the piston bowl shape is completed, the method also comprises the step of cutting the combustion analysis model to form a fan-shaped structure, wherein the included angle alpha of the fan-shaped structure is 360 degrees/n, and n is the number of the spray holes.
It is comparatively preferred, as shown in fig. 3, top oblique top structure is located stroke volume upper portion, and the central line and the stroke volume coincidence of top oblique top structure, the outer fringe and the stroke volume outer fringe parallel and level of top oblique top structure, top oblique top structure has upper surface and lower surface that are parallel to each other, top oblique top structure is for being used for connecting the inclined plane of upper surface and lower surface towards one side of central line, the border of upper surface is greater than the border of lower surface apart from the distance of central line.
Preferably, the simplification of the closed combustion chamber top clearance structure into a top pitched roof structure with consistent volume comprises the following steps:
mounting components such as an engine cylinder body, a cylinder cover, an air inlet/outlet valve, an air valve guide pipe, a cylinder gasket, a cylinder sleeve, a piston, an oil sprayer and the like according to actual assembly positions;
the thickness of the cylinder gasket is guaranteed to be the height after compression, the air inlet and outlet valves are in a closed state, and the piston is located at the top dead center position of the engine;
extracting a top structure of a closed combustion chamber formed in an engine cylinder by adopting a cre/o tool, and calculating the volume V of the top structure of the closed combustion chamberClearance；
At the guaranteed volume and VClearanceOn the premise of equality, the closed combustion chamber top structure is simplified into a top inclined top structure by using the following formula.
The simplified formula of the top pitched roof structure is as follows:
L_1＝(1/a*i)*(K_1+K_2+K_3+……K_i)；
L_2＝(1/a*i)*(S_1+S_2+S_3+……S_i)；
K_i＝S_i-R_i；
V＝π*H_1*[(D/2)^2-(L_2*L_2+L_1*L_1+L_1*L_2)/3]；
V＝Vclearance；
Wherein i is the number of the valves, S _ i is the radial distance between the center line of the ith valve and the center line of the cylinder, K _ i is the radial distance between the inner edge of the ith valve and the center line of the cylinder, R _ i is the radius of the ith valve, D is the diameter of the engine cylinder, H _1 is the height of the top pitched roof structure, a is a volume compensation coefficient, V is the volume of the top pitched roof structure, L _1 is the distance between the edge of the lower surface of the top pitched roof structure and the center line, and L _2 is the distance between the edge of the upper surface of the top pitched roof structure and the center line.
In this embodiment, H _1 is 1-3 mm, and a is 0.8-1.2.
Preferably, the stroke volume 2 is a combustion chamber volume formed by the top of the piston and the bottom of the cylinder cover when the engine piston is at the bottom dead center, and the stroke volume is expressed by a formula VPunching machinePi ^2 ^ L (D/2) where L is the engine stroke and D is the engine cylinder diameter.
Preferably, the piston annular gap is located at the lower part of the stroke volume, the central line of the piston annular gap is overlapped with the stroke volume, the outer edge of the piston annular gap is flush with the outer edge of the stroke volume, the piston annular gap is provided with an upper surface and a lower surface which are parallel to each other, one side of the piston annular gap, which faces the central line, is an inclined plane used for connecting the upper surface and the lower surface, and the distance from the edge of the upper surface to the central line is smaller than that from the edge of the lower surface to the central line. The extracting of the piston annulus includes:
mounting components such as an engine cylinder body, a cylinder gasket, a cylinder sleeve, a piston ring and the like according to actual assembly positions;
ensuring that the piston is at the top dead center position of the engine and the piston ring is in a compression state after installation;
extracting the annular gap structure formed by the piston, the piston ring and the cylinder sleeve by adopting a cre/o tool, and calculating the volume V of the annular gap structureAnnular space；
At the guaranteed volume and VAnnular spaceOn the premise of equality, the annular gap structure is simplified into a piston annular gap by using the following formula, as shown in fig. 4.
Preferably, the simplified formula of the piston annular clearance is as follows:
V＝π*H_2*[(D/2)^2-[(D/2-L_4)^2+(D/2-L_3)^2+(D/2-L_3)*
D/2-L_4)]/3]；
V＝Vannular space；
Wherein, H _2 is the height of the piston ring gap, L _3 is the distance from the edge of the upper surface of the piston ring gap to the central line, and L _4 is the distance from the edge of the lower surface of the piston ring gap to the central line.
In this embodiment, H _2 is 2-3 mm, L _3 is 8-10 mm, and L _4 is 4-6 mm.
Preferably, the extracting of the piston bowl shape comprises:
based on the actual structure of the engine, extracting the piston with the valve avoiding pit after removing the valve avoiding pit;
and for the piston without the valve avoiding pit, directly extracting.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims (10)

1. A diesel engine in-cylinder combustion analysis model building method is characterized in that:
simplifying the top clearance structure of the closed combustion chamber into a top inclined top structure with consistent volume;
taking the volume of a combustion chamber formed by the top of the piston and the bottom of a cylinder cover when the piston of the engine is at a bottom dead center as a stroke volume;
extracting an annular gap structure formed by a piston, a piston ring and a cylinder sleeve at the lower part of the stroke volume to form a piston annular gap, wherein the size of the outer diameter of the piston annular gap is equal to that of the outer diameter of the stroke volume;
extracting a piston bowl shape at the lower part of the stroke volume, wherein the center line of the piston bowl shape is superposed with the stroke volume;
and according to the axis of the piston, completing the assembly of a top inclined top structure, a stroke volume, a piston annular space and a piston bowl shape to form a combustion analysis model.
2. The diesel engine in-cylinder combustion analysis model creation method according to claim 1, characterized in that: the top pushes up the structure to one side towards the central line for being used for connecting upper surface and lower surface, the border of upper surface is greater than the border of lower surface apart from the distance of central line.
3. The method of modeling diesel engine in-cylinder combustion analysis of claim 1 wherein simplifying said closed combustion chamber overhead clearance structure to a consistent volume top lifter structure comprises:
installing an engine cylinder body, a cylinder cover, an air inlet/outlet valve, an air valve guide pipe, a cylinder gasket, a cylinder sleeve, a piston and an oil injector according to actual assembling positions;
the thickness of the cylinder gasket is guaranteed to be the height after compression, the air inlet and outlet valves are in a closed state, and the piston is located at the top dead center position of the engine;
extracting a top structure of a closed combustion chamber formed in an engine cylinder body, and calculating a volume V of the top structure of the closed combustion chamberClearance；
Simplifying the top structure of the closed combustion chamber into volume and VClearanceEqual top pitched roof construction.
4. The in-cylinder combustion analysis modeling method for a diesel engine according to claim 2, characterized in that the simplified formula of the top pentroof structure is as follows:
L_1＝(1/a*i)*(K_1+K_2+K_3+……K_i)；
L_2＝(1/a*i)*(S_1+S_2+S_3+……S_i)；
K_i＝S_i-R_i；
V＝π*H_1*[(D/2)^2-(L_2*L_2+L_1*L_1+L_1*L_2)/3]；
V＝Vclearance；
Wherein i is the number of the valves, S _ i is the radial distance between the center line of the ith valve and the center line of the cylinder, K _ i is the radial distance between the inner edge of the ith valve and the center line of the cylinder, R _ i is the radius of the ith valve, D is the diameter of the engine cylinder, H _1 is the height of the top pitched roof structure, a is a volume compensation coefficient, V is the volume of the top pitched roof structure, L _1 is the distance between the edge of the lower surface of the top pitched roof structure and the center line, and L _2 is the distance between the edge of the upper surface of the top pitched roof structure and the center line.
5. The diesel engine of claim 1The in-cylinder combustion analysis model building method is characterized in that the stroke volume is represented by a formula VPunching machinePi ^2 ^ L (D/2) where L is the engine stroke and D is the engine cylinder diameter.
6. The diesel engine in-cylinder combustion analysis model building method of claim 1, wherein the extraction of the piston annulus comprises:
installing an engine cylinder body, a cylinder gasket, a cylinder sleeve, a piston and a piston ring according to actual assembly positions;
ensuring that the piston is at the top dead center position of the engine and the piston ring is in a compression state after installation;
extracting the annular gap structure formed by the piston, the piston ring and the cylinder sleeve, and calculating the volume V of the annular gap structureAnnular space；
Simplifying the annular space structure into volume and VAnnular spaceEqual piston annular clearance.
7. The diesel engine in-cylinder combustion analysis model building method according to claim 1, characterized in that the piston annular gap is located at a lower portion of the stroke volume, a center line of the piston annular gap coincides with the stroke volume, an outer edge of the piston annular gap is flush with an outer edge of the stroke volume, the piston annular gap has an upper surface and a lower surface which are parallel to each other, a side of the piston annular gap facing the center line is a slope for connecting the upper surface and the lower surface, and a distance from an edge of the upper surface to the center line is smaller than a distance from an edge of the lower surface to the center line.
8. The diesel engine in-cylinder combustion analysis modeling method of claim 7, wherein the simplified formula for the piston annulus is as follows:
V＝π*H_2*[(D/2)^2-[(D/2-L_4)^2+(D/2-L_3)^2+(D/2-L_3)*D/2-L_4)]/3]；
V＝Vannular space；
Wherein, H _2 is the height of the piston ring gap, L _3 is the distance from the edge of the upper surface of the piston ring gap to the central line, and L _4 is the distance from the edge of the lower surface of the piston ring gap to the central line.
9. The diesel engine in-cylinder combustion analysis modeling method of claim 1, wherein the extracting of the piston bowl shape comprises:
based on the actual structure of the engine, extracting the piston with the valve avoiding pit after removing the valve avoiding pit;
and for the piston without the valve avoiding pit, directly extracting.
10. The method for building the in-cylinder combustion analysis model of the diesel engine according to claim 1, wherein after the assembly of the top pitched roof structure, the stroke volume, the piston annular space and the piston bowl shape is completed according to the piston axis, the method further comprises the step of cutting the combustion analysis model to form a fan-shaped structure, wherein an included angle α of the fan-shaped structure is 360 °/n, and n is the number of the injection holes.
CN202111497161.2A 2021-12-09 2021-12-09 Diesel engine in-cylinder combustion analysis model establishing method Pending CN114239164A (en)

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Application Number Priority Date Filing Date Title
CN202111497161.2A CN114239164A (en) 2021-12-09 2021-12-09 Diesel engine in-cylinder combustion analysis model establishing method

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Application Number Priority Date Filing Date Title
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