CN114757117A - Diesel engine air inlet performance evaluation method and system, terminal device and storage medium - Google Patents
Diesel engine air inlet performance evaluation method and system, terminal device and storage medium Download PDFInfo
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Abstract
The invention provides a method, a system, terminal equipment and a storage medium for evaluating the performance of an air inlet of a diesel engine, wherein the method comprises the following steps: determining the optimal vortex ratio of the diesel engine to be evaluated according to an engine combustion model, determining the average vortex ratio and the flow coefficient of an air passage of the diesel engine to be evaluated according to an air passage steady-state model, and evaluating the air passage characteristics of the diesel engine to be evaluated according to the average vortex ratio and the flow coefficient of the air passage; if the air passage characteristic of the air inlet passage of the diesel engine to be evaluated is qualified, acquiring a transient vortex ratio of the diesel engine to be evaluated at the closing moment of an inlet valve, and carrying out vortex comparison on the transient vortex ratio and the optimal vortex ratio; and if the transient vortex ratio is qualified by comparing the vortex ratio with the optimal vortex ratio, judging that the performance evaluation of the air inlet passage of the diesel engine to be evaluated is qualified. The method can effectively evaluate the air passage characteristic of the diesel engine air inlet passage, can effectively evaluate the vortex organization performance of the diesel engine air inlet passage, and improves the accuracy of evaluating the performance of the diesel engine air inlet passage.
Description
Technical Field
The invention relates to the technical field of diesel engines, in particular to a diesel engine air inlet performance evaluation method, a diesel engine air inlet performance evaluation system, terminal equipment and a storage medium.
Background
The air inlet of the diesel engine is one of important components of a combustion system design and a cylinder cover overall structure design, has very important influence on air quantity and vortex intensity in a cylinder and the dynamic property, economy and emission level of the diesel engine, has a key effect on combustion in the cylinder due to good air charging efficiency and air motion state, and is favorable for overall structure arrangement and design of the cylinder cover due to a reasonable air inlet mode, improves the cooling of the cylinder cover and improves the reliability, so that the design and performance evaluation of the air inlet are a key part in the development process of the diesel engine.
In the existing diesel engine air inlet passage performance evaluation process, the balance relation between the air passage swirl ratio and the flow coefficient of a diesel engine air inlet passage under the condition of steady-state constant pressure difference is evaluated generally based on an air passage steady flow test bed.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method, a system, a terminal device, and a storage medium for evaluating performance of a diesel engine intake duct, so as to solve a problem that performance evaluation accuracy is low in an existing diesel engine intake duct performance evaluation process.
The first aspect of the embodiments of the present invention provides a method for evaluating performance of an intake port of a diesel engine, including:
obtaining engine parameter information of a diesel engine to be evaluated, and constructing an engine combustion model according to the engine parameter information;
determining the optimal swirl ratio of the diesel engine to be evaluated according to the engine combustion model, and constructing an air passage steady-state model according to the air passage information of the diesel engine to be evaluated;
determining the average swirl ratio and the flow coefficient of the air passage of the diesel engine to be evaluated according to the steady-state model of the air passage, and evaluating the characteristics of the air passage of the diesel engine to be evaluated according to the average swirl ratio and the flow coefficient of the air passage;
if the air passage characteristic of the air inlet passage of the diesel engine to be evaluated is qualified, acquiring a transient vortex ratio at the closing moment of an air inlet valve in the diesel engine to be evaluated, and carrying out vortex comparison on the transient vortex ratio and the optimal vortex ratio;
And if the transient vortex ratio is qualified by the vortex ratio of the optimal vortex ratio, judging that the performance evaluation of the air inlet passage of the diesel engine to be evaluated is qualified.
Further, the determining the optimal swirl ratio of the diesel engine to be evaluated according to the engine combustion model comprises:
determining the specific oil consumption, nitrogen oxide emissions and soot emissions of the diesel engine to be evaluated at different swirl ratios according to the engine combustion model;
normalizing the specific oil consumption, the nitrogen oxide emissions and the soot emissions in the combustion result, and performing weighted average calculation on the normalized specific oil consumption, the normalized nitrogen oxide emissions and the normalized soot emissions to obtain a weighted score;
and determining the swirl ratio corresponding to the minimum weighted score as the optimal swirl ratio.
Further, the performing of the air passage characteristic evaluation on the air passage of the diesel engine to be evaluated according to the air passage average swirl ratio and the air passage flow coefficient includes:
matching the average swirl ratio of the air passage with a pre-stored air passage characteristic evaluation table to obtain a target flow coefficient;
if the air passage flow coefficient is larger than or equal to the target flow coefficient, judging that the air passage characteristic of the air inlet passage of the diesel engine to be evaluated is unqualified;
And if the air passage flow coefficient is smaller than the target flow coefficient, judging that the air passage characteristic evaluation of the air passage of the diesel engine to be evaluated is qualified.
Further, the method further comprises:
if the air passage characteristic of the air inlet passage of the diesel engine to be evaluated is not qualified, or the eddy current ratio of the transient eddy current ratio and the optimal eddy current ratio is not qualified, carrying out air passage structure adjustment on the air inlet passage of the diesel engine to be evaluated;
and returning to execute the step of constructing the steady-state air passage model and the subsequent steps according to the air passage information of the diesel engine to be evaluated after the air passage structure is adjusted until the air passage characteristic evaluation of the air passage of the diesel engine to be evaluated is qualified, and comparing the transient vortex ratio with the vortex of the optimal vortex ratio to be qualified.
Further, the adjusting the air passage structure of the air inlet passage of the diesel engine to be evaluated includes:
acquiring a coefficient difference between the air passage flow coefficient and the target flow coefficient, and matching the vehicle identification of the diesel engine to be evaluated and the coefficient difference with a pre-stored air passage structure adjustment scheme query table to obtain an air passage adjustment scheme, wherein the air passage structure adjustment scheme query table stores corresponding relations between different vehicle identifications and coefficient differences and corresponding air passage adjustment schemes;
And obtaining a swirl ratio difference value between the transient swirl ratio and the optimal swirl ratio, and matching the vehicle identification of the diesel engine to be evaluated and the swirl ratio difference value with the air passage structure adjustment scheme query table to obtain the air passage adjustment scheme, wherein the air passage structure adjustment scheme query table stores corresponding relations between different vehicle identifications and swirl ratio difference values and corresponding air passage adjustment schemes.
Further, after the swirl ratio between the transient swirl ratio and the optimal swirl ratio is qualified, the method further includes:
determining a to-be-checked result of the diesel engine to be evaluated under the transient swirl ratio according to the engine combustion model;
normalizing the specific oil consumption, the nitrogen oxide emissions and the soot emissions in the result to be verified, and performing weighted average calculation on the normalized specific oil consumption, the normalized nitrogen oxide emissions and the normalized soot emissions to obtain a weighted score to be verified;
if the weighted score to be verified is smaller than a weighted score threshold value, judging that the verification of the airway combustion characteristics of the diesel engine to be evaluated is qualified;
and if the weighted score to be verified is greater than or equal to the weighted score threshold value, judging that the verification of the combustion characteristics of the air passage of the diesel engine to be evaluated is unqualified.
Further, the swirl comparing the transient swirl ratio with the optimal swirl ratio includes:
obtaining a swirl ratio difference between the transient swirl ratio and the optimal swirl ratio;
if the swirl ratio difference value is smaller than a swirl ratio threshold value, judging that the swirl ratio of the transient swirl ratio and the optimum swirl ratio is qualified;
and if the swirl ratio difference is greater than or equal to a swirl ratio threshold value, determining that the swirl ratio of the transient swirl ratio and the optimum swirl ratio is unqualified.
A second aspect of an embodiment of the present invention provides a system for evaluating performance of an intake port of a diesel engine, including:
the model building module is used for obtaining engine parameter information of the diesel engine to be evaluated and building an engine combustion model according to the engine parameter information;
the swirl ratio determining module is used for determining the optimal swirl ratio of the diesel engine to be evaluated according to the engine combustion model and constructing an air passage steady-state model according to the air passage information of the diesel engine to be evaluated;
the characteristic evaluation module is used for determining the average swirl ratio and the flow coefficient of the air passage of the diesel engine to be evaluated according to the steady-state model of the air passage and evaluating the characteristics of the air passage of the diesel engine to be evaluated according to the average swirl ratio and the flow coefficient of the air passage;
The vortex comparison module is used for acquiring a transient vortex ratio at the closing moment of an inlet valve in the diesel engine to be evaluated if the air passage characteristic evaluation of the air inlet passage of the diesel engine to be evaluated is qualified, and carrying out vortex comparison on the transient vortex ratio and the optimal vortex ratio; and if the transient vortex ratio is qualified by the vortex ratio of the optimal vortex ratio, judging that the performance evaluation of the air inlet passage of the diesel engine to be evaluated is qualified.
A third aspect of the embodiments of the present invention provides a terminal device, which includes a memory, a processor, and a computer program stored in the memory and operable on the terminal device, where the processor implements the steps of the diesel engine intake duct performance evaluation method provided in the first aspect when executing the computer program.
A fourth aspect of the embodiments of the present invention provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements the steps of the method for evaluating performance of an intake port of a diesel engine provided in the first aspect.
The method, the system, the terminal equipment and the storage medium for evaluating the performance of the diesel engine air inlet provided by the embodiment of the invention have the following beneficial effects: the method comprises the steps of obtaining engine parameter information of a diesel engine to be evaluated, constructing an engine combustion model according to the engine parameter information, effectively determining the optimal vortex ratio of the diesel engine to be evaluated based on the engine combustion model, constructing an air passage steady-state model according to the air passage information of the diesel engine to be evaluated, effectively determining the air passage average vortex ratio and the air passage flow coefficient of the diesel engine to be evaluated based on the air passage steady-state model, effectively evaluating the air passage characteristic of an air passage of the diesel engine air inlet passage according to the air passage average vortex ratio and the air passage flow coefficient, effectively evaluating the vortex organization performance of the diesel engine air inlet passage by obtaining the transient vortex ratio of the diesel engine to be evaluated at the closing moment and carrying out vortex comparison on the transient vortex ratio and the optimal vortex ratio, and improving the accuracy of performance evaluation of the diesel engine air inlet passage.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a flowchart illustrating an implementation of a method for evaluating performance of an intake port of a diesel engine according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an air intake process in a diesel engine under evaluation according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating an implementation of a method for evaluating the performance of an intake port of a diesel engine according to another embodiment of the present invention;
FIG. 4 is a block diagram of a system for evaluating performance of an intake port of a diesel engine according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating an implementation of a system for evaluating performance of an intake port of a diesel engine according to an embodiment of the present invention;
fig. 6 is a block diagram of a terminal device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further 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.
Referring to fig. 1, fig. 1 shows a flowchart of an implementation of a method for evaluating performance of an intake port of a diesel engine according to an embodiment of the present invention, including:
step S10, obtaining engine parameter information of the diesel engine to be evaluated, and constructing an engine combustion model according to the engine parameter information;
the method comprises the steps that an engine in-cylinder fluid mechanics calculation model (an engine combustion model) is established based on engine parameter information, in the step, in order to improve calculation speed, the engine combustion model only comprises 1/8 combustion chamber structures and does not comprise air passage structures, in-cylinder combustion processes in a range from closing time of an intake valve to opening time of an exhaust valve of the diesel engine to be evaluated are calculated by taking an initial swirl ratio as a boundary condition, and the engine in-cylinder fluid mechanics calculation model is used for simulating the combustion processes in the engine cylinder;
step S20, determining the optimal swirl ratio of the diesel engine to be evaluated according to the engine combustion model, and constructing an air passage steady-state model according to the air passage information of the diesel engine to be evaluated;
the method comprises the following steps that the optimal swirl ratio of a diesel engine to be evaluated is determined, the evaluation of the swirl organization performance of a subsequent diesel engine to be evaluated is improved, and further the accuracy of the evaluation of the diesel engine air inlet is improved, wherein an air passage steady-state model comprises the air inlet, an air valve seat ring and a simulation air cylinder, the length of the simulation air cylinder is 2.5 times of the cylinder diameter, and the swirl ratio detection position is 1.75 times of the cylinder diameter;
Optionally, in this step, the determining an optimal swirl ratio of the diesel engine to be evaluated according to the engine combustion model includes:
determining the specific oil consumption, nitrogen oxide emission and soot emission combustion results of the diesel engine to be evaluated at different swirl ratios according to the engine combustion model;
wherein, in the engine combustion model, at 0.2 intervals, from the output results of the engine combustion model, the specific fuel consumption with different swirl ratios, the combustion results of nitrogen oxide emissions and soot emissions are output, for example, the engine combustion model is controlled to respectively output the specific fuel consumption with 1.4 swirl ratio, 1.6 swirl ratio, 1.8 swirl ratio, 2.0 swirl ratio and 2.2 swirl ratio, the combustion results of nitrogen oxide emissions and soot emissions;
normalizing the specific oil consumption, the nitrogen oxide emissions and the soot emissions in the combustion result, and performing weighted average calculation on the normalized specific oil consumption, the nitrogen oxide emissions and the soot emissions to obtain a weighted score;
the method comprises the following steps that the specific oil consumption, the nitrogen oxide emission and the soot emission in a combustion result are subjected to normalization treatment, so that the specific oil consumption, the nitrogen oxide emission and the soot emission are effectively facilitated to be calculated in a weighting manner, in the step, the weights corresponding to the specific oil consumption, the nitrogen oxide emission and the soot emission can be set according to requirements, and in the step, the weights corresponding to the specific oil consumption, the nitrogen oxide emission and the soot emission are sequentially set to be 0.4, 0.3 and 0.3;
Determining the swirl ratio corresponding to the minimum weighting score as the optimal swirl ratio;
please refer to the following table, which shows the weighted scores corresponding to the swirl ratio of 1.4, 1.6, 1.8, 2.0 and 2.2 provided in the present embodiment;
as can be seen from the above table, the swirl ratio is the optimum swirl ratio when the swirl ratio is 1.8.
Step S30, determining the average swirl ratio and the flow coefficient of the air passage of the diesel engine to be evaluated according to the steady-state model of the air passage, and evaluating the air passage characteristics of the air inlet passage of the diesel engine to be evaluated according to the average swirl ratio and the flow coefficient of the air passage;
the method comprises the steps of calculating and outputting the average vortex ratio and flow coefficient results of an air passage in an air passage steady-state model to obtain the average vortex ratio and flow coefficient of the air passage, effectively evaluating the air passage characteristic of an air passage of the diesel engine through the average vortex ratio and flow coefficient of the air passage, and improving the evaluation accuracy of the air passage of the diesel engine, wherein in the step, the average vortex ratio is 1.53, and the flow coefficient of the air passage is 0.362;
step S40, if the air passage characteristic of the air inlet passage of the diesel engine to be evaluated is qualified, acquiring a transient vortex ratio of the diesel engine to be evaluated at the closing moment of an air inlet valve, and carrying out vortex comparison on the transient vortex ratio and the optimal vortex ratio;
If the air passage characteristic of the air inlet passage of the diesel engine to be evaluated is qualified, calculating the air inlet process from the opening moment of the air inlet valve to the closing moment of the air inlet valve in the diesel engine to be evaluated by establishing an engine air inlet process fluid mechanics calculation model, and outputting the transient vortex ratio of the closing moment of the air inlet valve, referring to fig. 2, wherein the transient vortex ratio of the closing moment of the air inlet valve in the diesel engine to be evaluated is 2.0;
optionally, in this step, the performing vortex ratio on the transient vortex ratio and the optimal vortex ratio includes:
obtaining a swirl ratio difference between the transient swirl ratio and the optimal swirl ratio; the accuracy of subsequent eddy current ratio detection is improved by calculating the eddy current ratio difference between the transient eddy current ratio and the optimal eddy current ratio;
if the swirl ratio difference value is smaller than a swirl ratio threshold value, judging that the swirl ratio of the transient swirl ratio and the optimum swirl ratio is qualified;
the swirl ratio threshold value can be set according to requirements, for example, the swirl ratio threshold value can be set to a numerical value of 0.3, 0.5 or 0.8, and the like, in the step, the swirl ratio threshold value is set to 0.3, the transient swirl ratio is 2.0, and the optimal swirl ratio is 1.8, so that the swirl ratio difference value is 0.2, the swirl ratio difference value is smaller than the swirl ratio threshold value, the swirl ratio of the transient swirl ratio and the optimal swirl ratio is judged to be qualified, and the swirl structure performance of the air inlet channel of the diesel engine to be evaluated meets the performance condition;
If the swirl ratio difference is larger than or equal to a swirl ratio threshold value, determining that the swirl ratio of the transient swirl ratio and the optimum swirl ratio is unqualified;
if the swirl ratio difference is larger than or equal to the swirl ratio threshold, determining that the swirl ratio of the transient swirl ratio and the optimum swirl ratio is unqualified, and determining that the swirl structure performance of the air inlet channel of the diesel engine to be evaluated does not meet the performance condition.
Step S50, if the vortex ratio of the transient vortex ratio and the optimal vortex ratio is qualified, judging that the performance evaluation of the air inlet passage of the diesel engine to be evaluated is qualified;
when the air passage characteristic of the air inlet passage of the diesel engine to be evaluated is evaluated to be qualified, and the vortex structure performance of the air inlet passage of the diesel engine to be evaluated meets the performance condition, judging that the performance evaluation of the air inlet passage of the diesel engine to be evaluated is qualified;
optionally, in this step, after the swirl ratio of the transient swirl ratio and the optimal swirl ratio is qualified, the method further includes:
determining a to-be-verified result of the diesel engine to be evaluated under the transient vortex ratio according to the engine combustion model;
establishing a fluid mechanics calculation model in an engine cylinder for the final air passage, calculating an air inlet combustion process from the starting moment of an air inlet valve to the starting moment of an exhaust valve, and outputting results of specific oil consumption, nitrogen oxide emissions and soot emissions;
Normalizing the specific oil consumption, the nitrogen oxide emissions and the soot emissions in the result to be verified, and performing weighted average calculation on the normalized specific oil consumption, the normalized nitrogen oxide emissions and the normalized soot emissions to obtain a weighted score to be verified;
normalizing the specific oil consumption, the nitrogen oxide emissions and the soot emissions in the result to be verified, and calculating weighted average scores of the specific oil consumption, the nitrogen oxide emissions and the soot emissions by taking 0.4, 0.3 and 0.3 as weights to obtain a weighted score to be verified;
if the weighted score to be verified is smaller than a weighted score threshold value, judging that the verification of the airway combustion characteristics of the diesel engine to be evaluated is qualified;
if the weighted score to be verified is greater than or equal to the weighted score threshold value, judging that the verification of the combustion characteristics of the air passage of the diesel engine to be evaluated is unqualified;
the weighted score threshold may be set according to a requirement, for example, the weighted score threshold may be set to 0.8, 0.9, or 0.95, and if the weighted score to be verified is smaller than the weighted score threshold, it is determined that the combustion characteristic of the air passage of the diesel engine to be evaluated is verified to be qualified, and if the weighted score to be verified is greater than or equal to the weighted score threshold, it is determined that the combustion characteristic of the air passage of the diesel engine to be evaluated is verified to be unqualified.
In the embodiment, the engine parameter information of the diesel engine to be evaluated is obtained, the engine combustion model is built according to the engine parameter information, the optimal vortex ratio of the diesel engine to be evaluated can be effectively determined based on the engine combustion model, the air passage steady-state model is built through the air passage information of the diesel engine to be evaluated, the air passage average vortex ratio and the air passage flow coefficient of the diesel engine to be evaluated can be effectively determined based on the air passage steady-state model, the air passage characteristic of the air passage of the diesel engine can be effectively evaluated through the air passage average vortex ratio and the air passage flow coefficient, the transient vortex organization performance of the air passage of the diesel engine can be effectively evaluated by obtaining the transient vortex ratio at the closing moment of the air inlet valve in the diesel engine to be evaluated and carrying out vortex comparison on the transient vortex ratio and the optimal vortex ratio, and the accuracy of performance evaluation of the air passage of the diesel engine is improved.
Referring to fig. 3, fig. 3 is a flowchart illustrating a method for evaluating performance of an intake port of a diesel engine according to another embodiment of the present invention. Compared with the embodiment in fig. 1, the method for evaluating the performance of the intake port of the diesel engine provided by the embodiment is used for further detailing the step S30 in the embodiment in fig. 1, and includes:
Step S31, matching the average swirl ratio of the air passage with a pre-stored air passage characteristic evaluation table to obtain a target flow coefficient;
the airway characteristic evaluation table stores the corresponding relationship between the average swirl ratio of different airways and the corresponding target flow coefficient, and for example, the airway characteristic evaluation table is as follows:
in the step, when the average vortex ratio is 1.53, a corresponding target flow coefficient value is obtained according to interpolation and is 0.354;
step S32, if the air passage flow coefficient is larger than or equal to the target flow coefficient, determining that the air passage characteristic evaluation of the air inlet passage of the diesel engine to be evaluated is unqualified;
if the flow coefficient of the air passage is greater than or equal to the target flow coefficient, judging that the evaluation of the air passage characteristic of the air inlet passage of the diesel engine to be evaluated is unqualified;
step S33, if the air passage flow coefficient is smaller than the target flow coefficient, judging that the air passage characteristic evaluation of the air inlet passage of the diesel engine to be evaluated is qualified;
if the target flow coefficient value is 0.354 and the air passage flow coefficient obtained in step S30 is 0.362, the air passage flow coefficient is smaller than the target flow coefficient, so that the air passage characteristic of the air inlet passage of the diesel engine to be evaluated is qualified;
Optionally, in this embodiment, the method further includes:
if the air passage characteristic of the air inlet passage of the diesel engine to be evaluated is unqualified, or the eddy current ratio of the transient eddy current ratio and the optimal eddy current ratio is unqualified, adjusting the air passage structure of the air inlet passage of the diesel engine to be evaluated;
if the air passage characteristic of the air inlet passage of the diesel engine to be evaluated is unqualified, or the eddy current ratio of the transient eddy current ratio and the optimal eddy current ratio is unqualified, judging that the structure of the air inlet passage of the diesel engine to be evaluated is wrong, and adjusting the air passage structure of the air inlet passage of the diesel engine to be evaluated to improve the overall performance of the air inlet passage of the diesel engine to be evaluated;
returning to the step of constructing the steady-state model of the air passage and the subsequent steps according to the air passage information of the diesel engine to be evaluated after the air passage structure is adjusted until the air passage characteristic evaluation of the air passage of the diesel engine to be evaluated is qualified and the vortex comparison of the transient vortex ratio and the optimal vortex ratio is qualified;
and returning to execute the step of constructing the air passage steady-state model and the subsequent steps through the air passage information of the diesel engine to be evaluated after the air passage structure is adjusted so as to achieve the effects of continuous evaluation and continuous air passage structure adjustment of the diesel engine to be evaluated until the air passage characteristic of the air passage of the diesel engine to be evaluated is evaluated qualified, and the vortex ratio of the transient vortex ratio and the optimal vortex ratio is qualified.
Further, in this step, the adjusting the air passage structure of the air inlet passage of the diesel engine to be evaluated includes:
acquiring a coefficient difference value between the air passage flow coefficient and the target flow coefficient, and matching the vehicle identification of the diesel engine to be evaluated and the coefficient difference value with a pre-stored air passage structure adjustment scheme query table to obtain an air passage adjustment scheme; the air channel structure adjustment scheme lookup table stores corresponding relations between different vehicle identifications and coefficient difference values and corresponding air channel adjustment schemes;
and obtaining a vortex ratio difference value between the transient vortex ratio and the optimal vortex ratio, and matching the vehicle identification of the diesel engine to be evaluated and the vortex ratio difference value with the air passage structure adjustment scheme query table to obtain the air passage adjustment scheme, wherein the air passage structure adjustment scheme query table stores corresponding relations between different vehicle identifications and vortex ratio difference values and corresponding air passage adjustment schemes.
In the embodiment, the average swirl ratio of the air passage is matched with the pre-stored air passage characteristic evaluation table to query the target flow coefficient corresponding to the average swirl of the air passage, and based on the queried target flow coefficient, the air passage characteristic evaluation of the air passage of the diesel engine to be evaluated can be effectively carried out, so that the accuracy of the performance detection of the air passage of the diesel engine is improved.
Referring to fig. 4 to fig. 5, fig. 4 is a block diagram illustrating an exemplary system 100 for evaluating performance of an intake port of a diesel engine according to an embodiment of the present invention. The system 100 for evaluating the performance of the diesel engine intake duct in this embodiment includes units for executing steps in the embodiments corresponding to fig. 1 and fig. 3. Please refer to fig. 1 and fig. 3 and the related descriptions in the embodiments corresponding to fig. 1 and fig. 3. For convenience of explanation, only the portions related to the present embodiment are shown. Referring to fig. 4, the diesel engine intake port performance evaluation system 100 includes: the vortex ratio estimation system comprises a model building module 10, a vortex ratio determining module 11, a characteristic evaluation module 12 and a vortex ratio comparing module 13, wherein:
the model building module 10 is used for obtaining engine parameter information of the diesel engine to be evaluated and building an engine combustion model according to the engine parameter information.
And the swirl ratio determining module 11 is used for determining the optimal swirl ratio of the diesel engine to be evaluated according to the engine combustion model and constructing an air passage steady-state model according to the air passage information of the diesel engine to be evaluated.
Optionally, the swirl ratio determination module 11 is further configured to: determining the specific oil consumption, nitrogen oxide emissions and soot emissions of the diesel engine to be evaluated at different swirl ratios according to the engine combustion model;
Normalizing the specific oil consumption, the nitrogen oxide emissions and the soot emissions in the combustion result, and performing weighted average calculation on the normalized specific oil consumption, the normalized nitrogen oxide emissions and the normalized soot emissions to obtain a weighted score;
and determining the swirl ratio corresponding to the minimum weighted score as the optimal swirl ratio.
And the characteristic evaluation module 12 is configured to determine an airway average swirl ratio and an airway flow coefficient of the diesel engine to be evaluated according to the airway steady-state model, and perform airway characteristic evaluation on an air inlet channel of the diesel engine to be evaluated according to the airway average swirl ratio and the airway flow coefficient.
Optionally, the characteristic evaluation module 12 is further configured to: matching the average swirl ratio of the air passage with a pre-stored air passage characteristic evaluation table to obtain a target flow coefficient;
if the air passage flow coefficient is larger than or equal to the target flow coefficient, judging that the air passage characteristic of the air inlet passage of the diesel engine to be evaluated is unqualified;
and if the air passage flow coefficient is smaller than the target flow coefficient, judging that the air passage characteristic evaluation of the air passage of the diesel engine to be evaluated is qualified.
The vortex comparison module 13 is configured to, if the air passage characteristic of the air inlet passage of the diesel engine to be evaluated is qualified, obtain a transient vortex ratio at a closing time of an inlet valve in the diesel engine to be evaluated, and perform vortex comparison on the transient vortex ratio and the optimal vortex ratio; and if the vortex comparison between the transient vortex ratio and the optimal vortex ratio is qualified, judging that the performance evaluation of the air inlet passage of the diesel engine to be evaluated is qualified.
Optionally, the vortex comparison module 13 is further configured to: if the air passage characteristic of the air inlet passage of the diesel engine to be evaluated is not qualified, or the eddy current ratio of the transient eddy current ratio and the optimal eddy current ratio is not qualified, carrying out air passage structure adjustment on the air inlet passage of the diesel engine to be evaluated;
and returning to execute the step of constructing the steady-state model of the air passage and the subsequent steps according to the air passage information of the diesel engine to be evaluated after the air passage structure is adjusted until the air passage characteristic evaluation of the air passage of the diesel engine to be evaluated is qualified, and the transient vortex ratio is qualified by comparing the vortex of the optimal vortex ratio with the vortex of the transient vortex ratio.
Further, the vortex comparison module 13 is further configured to: determining a to-be-checked result of the diesel engine to be evaluated under the transient swirl ratio according to the engine combustion model;
normalizing the specific oil consumption, the nitrogen oxide emissions and the soot emissions in the result to be verified, and performing weighted average calculation on the normalized specific oil consumption, the normalized nitrogen oxide emissions and the normalized soot emissions to obtain a weighted score to be verified;
if the weighted score to be verified is smaller than a weighted score threshold value, judging that the verification of the airway combustion characteristics of the diesel engine to be evaluated is qualified;
And if the weighted score to be verified is greater than or equal to the weighted score threshold value, judging that the verification of the combustion characteristics of the air passage of the diesel engine to be evaluated is unqualified.
Further, the vortex comparison module 13 is further configured to: obtaining a swirl ratio difference between the transient swirl ratio and the optimal swirl ratio;
if the swirl ratio difference value is smaller than a swirl ratio threshold value, judging that the swirl ratio of the transient swirl ratio and the optimal swirl ratio is qualified;
and if the swirl ratio difference is larger than or equal to a swirl ratio threshold value, determining that the swirl ratio of the transient swirl ratio and the optimal swirl ratio is unqualified.
Referring to fig. 5, the specific implementation steps of the diesel engine intake duct performance evaluation system 100 of the present embodiment include:
step one, establishing a combustion model. Establishing an in-cylinder fluid mechanics calculation model of the engine, wherein in order to improve the calculation speed, the model only comprises a 1/8 combustion chamber structure and does not comprise an air passage structure, and an in-cylinder combustion process from the closing time of an intake valve to the opening time of an exhaust valve of the diesel engine is calculated by taking an initial swirl ratio as a boundary condition;
and step two, selecting the optimal vortex ratio. And outputting results of specific oil consumption, nitrogen oxide emission and soot emission of different swirl ratios from results of the in-cylinder calculation model at intervals of 0.2, normalizing the results, calculating weighted average scores of the specific oil consumption, the nitrogen oxide emission and the soot emission by taking 0.4, 0.3 and 0.3 as weights, and obtaining the optimum swirl ratio value as the swirl ratio corresponding to the scheme with the minimum score. The calculation results are shown in the table, and it can be seen that the optimal swirl ratio is obtained when the swirl ratio is 1.8;
And step three, calculating the steady state of the air passage. Establishing an air passage hydrodynamics steady-state calculation model, wherein the air passage hydrodynamics steady-state calculation model comprises an air inlet passage, an air valve seat ring and a simulation air cylinder, the length of the simulation air cylinder is 2.5 times of the cylinder diameter, the position of detecting the swirl ratio is 1.75 times of the cylinder diameter, and the average swirl ratio and the flow coefficient result of the air passage are respectively calculated and output, in the embodiment, the result is 1.53 of the swirl ratio, and the flow coefficient is 0.362;
step four, evaluating the airway characteristics;
and step five, evaluating the transient swirl ratio of the air passage. Establishing a hydrodynamics calculation model in the air inlet process of the engine, calculating the air inlet process from the opening moment of an air inlet valve of the diesel engine to the closing moment of the air inlet valve, and outputting a transient vortex ratio of the closing moment of the air inlet valve;
and step six, modifying the air passage vortex ratio. According to the difference between the swirl ratio at the closing time of the intake valve output in the step five and the optimal swirl ratio in the step two, modifying the air passage structure to change the swirl ratio, and repeating the processes from the step three to the step six until the swirl ratio at the closing time of the intake valve meets the requirement of the optimal swirl ratio, wherein in the embodiment, the transient swirl ratio is 2.0, the optimal swirl ratio is 1.8, the difference is 0.2, and the air passage structure is not modified any more in an acceptable range;
And seventhly, checking the combustion characteristics of the air passage. And establishing a fluid mechanics calculation model in an engine cylinder for the final air passage, calculating an air inlet combustion process from the starting moment of an air inlet valve to the starting moment of an exhaust valve, outputting results of specific oil consumption, nitrogen oxide emissions and soot emissions, normalizing the results, calculating weighted average scores of the specific oil consumption, the nitrogen oxide emissions and the soot emissions by taking 0.4, 0.3 and 0.3 as weights, and finally scoring to 0.66.
In the embodiment, the air inlet capacity and the vortex organization capacity of the air inlet channel can be evaluated, the influence of the air inlet channel on the combustion emission of the diesel engine can be evaluated, the design selection of the air inlet channel can be guided in the conceptual design stage of the diesel engine, or the improved design of the air channel can be guided in the upgrading process of the diesel engine, an engine combustion model is constructed according to the engine parameter information by obtaining the engine parameter information of the diesel engine to be evaluated, the optimal vortex ratio of the diesel engine to be evaluated can be effectively determined based on the engine combustion model, an air channel steady-state model is constructed according to the air channel information of the diesel engine to be evaluated, the air channel average vortex ratio and the air channel flow coefficient of the diesel engine to be evaluated can be effectively determined based on the air channel steady-state model, the air channel characteristic of the air inlet channel of the diesel engine can be effectively evaluated according to the air channel average vortex ratio and the air channel flow coefficient, the transient vortex ratio at the closing time of the air inlet valve in the diesel engine to be evaluated can be effectively evaluated, and the transient vortex ratio is compared with the optimal vortex ratio, so that the vortex organization performance of the diesel engine air inlet channel can be effectively evaluated, and the accuracy of evaluating the performance of the diesel engine air inlet channel is improved.
Fig. 6 is a block diagram of a terminal device 2 according to another embodiment of the present invention. As shown in fig. 6, the terminal device 2 of this embodiment includes: a processor 20, a memory 21 and a computer program 22, such as a program for a diesel engine intake duct performance evaluation method, stored in said memory 21 and executable on said processor 20. The processor 20 implements the steps of the above-mentioned methods for evaluating the performance of the intake port of the diesel engine, such as S10 to S50 shown in fig. 1 or S31 to S33 shown in fig. 3, when executing the computer program 22. Alternatively, when the processor 20 executes the computer program 22, the functions of the modules in the embodiment corresponding to fig. 3, for example, the functions of the modules 10 to 13 shown in fig. 4, please refer to the related description in the embodiment corresponding to fig. 3, which is not described herein again.
Illustratively, the computer program 22 may be divided into one or more units, which are stored in the memory 21 and executed by the processor 20 to accomplish the present invention. The unit or units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 22 in the terminal device 2. For example, the computer program 22 may be divided into a model building module 10, a swirl ratio determining module 11, a characteristic evaluation module 12, and a swirl comparison module 13, each of which functions as described above.
The terminal device may include, but is not limited to, a processor 20, a memory 21. Those skilled in the art will appreciate that fig. 6 is merely an example of the terminal device 2 and does not constitute a limitation of the terminal device 2, and may include more or fewer components than those shown, or some of the components may be combined, or different components, e.g., the terminal device may also include input-output devices, network access devices, buses, etc.
The Processor 20 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 21 may be an internal storage unit of the terminal device 2, such as a hard disk or a memory of the terminal device 2. The memory 21 may also be an external storage device of the terminal device 2, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the terminal device 2. Further, the memory 21 may also include both an internal storage unit and an external storage device of the terminal device 2. The memory 21 is used for storing the computer program and other programs and data required by the terminal device. The memory 21 may also be used to temporarily store data that has been output or is to be output.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored, and when executed by a processor, the computer program may implement:
obtaining engine parameter information of a diesel engine to be evaluated, and constructing an engine combustion model according to the engine parameter information;
determining the optimal swirl ratio of the diesel engine to be evaluated according to the engine combustion model, and constructing an air passage steady-state model according to the air passage information of the diesel engine to be evaluated;
determining the average swirl ratio and the flow coefficient of the air passage of the diesel engine to be evaluated according to the steady-state model of the air passage, and evaluating the characteristics of the air passage of the diesel engine to be evaluated according to the average swirl ratio and the flow coefficient of the air passage;
if the air passage characteristic of the air inlet passage of the diesel engine to be evaluated is qualified, acquiring a transient vortex ratio of the diesel engine to be evaluated at the closing moment of an inlet valve, and carrying out vortex comparison on the transient vortex ratio and the optimal vortex ratio;
and if the transient vortex ratio is qualified by the vortex ratio of the optimal vortex ratio, judging that the performance evaluation of the air inlet passage of the diesel engine to be evaluated is qualified.
The above-mentioned embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention 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 depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.
Claims (10)
1. A diesel engine air inlet performance evaluation method is characterized by comprising the following steps:
obtaining engine parameter information of a diesel engine to be evaluated, and constructing an engine combustion model according to the engine parameter information;
determining the optimal swirl ratio of the diesel engine to be evaluated according to the engine combustion model, and constructing an air passage steady-state model according to the air passage information of the diesel engine to be evaluated;
determining the average swirl ratio and the flow coefficient of the air passage of the diesel engine to be evaluated according to the steady-state model of the air passage, and evaluating the characteristics of the air passage of the diesel engine to be evaluated according to the average swirl ratio and the flow coefficient of the air passage;
If the air passage characteristic of the air inlet passage of the diesel engine to be evaluated is qualified, acquiring a transient vortex ratio at the closing moment of an air inlet valve in the diesel engine to be evaluated, and carrying out vortex comparison on the transient vortex ratio and the optimal vortex ratio;
and if the transient vortex ratio is qualified by the vortex ratio of the optimal vortex ratio, judging that the performance evaluation of the air inlet passage of the diesel engine to be evaluated is qualified.
2. The method for evaluating the performance of the air inlet channel of the diesel engine as claimed in claim 1, wherein the step of determining the optimal swirl ratio of the diesel engine to be evaluated according to the engine combustion model comprises the following steps:
determining the specific oil consumption, nitrogen oxide emissions and soot emissions of the diesel engine to be evaluated at different swirl ratios according to the engine combustion model;
normalizing the specific oil consumption, the nitrogen oxide emissions and the soot emissions in the combustion result, and performing weighted average calculation on the normalized specific oil consumption, the normalized nitrogen oxide emissions and the normalized soot emissions to obtain a weighted score;
and determining the swirl ratio corresponding to the minimum weighted score as the optimal swirl ratio.
3. The method for evaluating the performance of the air inlet channel of the diesel engine according to claim 1, wherein the evaluation of the air channel characteristics of the air inlet channel of the diesel engine to be evaluated according to the air channel average swirl ratio and the air channel flow coefficient comprises the following steps:
Matching the average swirl ratio of the air passage with a pre-stored air passage characteristic evaluation table to obtain a target flow coefficient;
if the air passage flow coefficient is larger than or equal to the target flow coefficient, judging that the air passage characteristic of the air inlet passage of the diesel engine to be evaluated is unqualified;
and if the air passage flow coefficient is smaller than the target flow coefficient, judging that the air passage characteristic evaluation of the air passage of the diesel engine to be evaluated is qualified.
4. The method for evaluating the performance of the diesel engine air inlet according to claim 3, further comprising:
if the air passage characteristic of the air inlet passage of the diesel engine to be evaluated is unqualified, or the eddy current ratio of the transient eddy current ratio and the optimal eddy current ratio is unqualified, adjusting the air passage structure of the air inlet passage of the diesel engine to be evaluated;
and returning to execute the step of constructing the steady-state air passage model and the subsequent steps according to the air passage information of the diesel engine to be evaluated after the air passage structure is adjusted until the air passage characteristic evaluation of the air passage of the diesel engine to be evaluated is qualified, and comparing the transient vortex ratio with the vortex of the optimal vortex ratio to be qualified.
5. The method for evaluating the performance of the air inlet channel of the diesel engine as claimed in claim 4, wherein the adjusting of the air channel structure of the air inlet channel of the diesel engine to be evaluated comprises the following steps:
Acquiring a coefficient difference value between the air passage flow coefficient and the target flow coefficient, and matching the vehicle identification and the coefficient difference value of the diesel engine to be evaluated with a pre-stored air passage structure adjustment scheme query table to obtain an air passage adjustment scheme, wherein the air passage structure adjustment scheme query table stores corresponding relations between different vehicle identifications and coefficient difference values and corresponding air passage adjustment schemes;
and obtaining a swirl ratio difference value between the transient swirl ratio and the optimal swirl ratio, and matching the vehicle identification of the diesel engine to be evaluated and the swirl ratio difference value with the air passage structure adjustment scheme query table to obtain the air passage adjustment scheme, wherein the air passage structure adjustment scheme query table stores corresponding relations between different vehicle identifications and swirl ratio difference values and corresponding air passage adjustment schemes.
6. The method for evaluating the performance of the diesel engine intake duct according to claim 1, further comprising, after the passing of the swirl ratio between the transient swirl ratio and the optimal swirl ratio, the steps of:
determining a to-be-checked result of the diesel engine to be evaluated under the transient swirl ratio according to the engine combustion model;
Normalizing the specific oil consumption, the nitrogen oxide emissions and the soot emissions in the result to be verified, and performing weighted average calculation on the normalized specific oil consumption, the normalized nitrogen oxide emissions and the normalized soot emissions to obtain a weighted score to be verified;
if the weighted score to be verified is smaller than a weighted score threshold value, judging that the verification of the airway combustion characteristics of the diesel engine to be evaluated is qualified;
and if the weighted score to be verified is greater than or equal to the weighted score threshold value, judging that the verification of the combustion characteristics of the air passage of the diesel engine to be evaluated is unqualified.
7. The method for evaluating the performance of the diesel engine intake duct according to any one of claims 1 to 6, wherein the comparing the transient swirl ratio with the optimal swirl ratio includes:
obtaining a swirl ratio difference between the transient swirl ratio and the optimal swirl ratio;
if the swirl ratio difference value is smaller than a swirl ratio threshold value, judging that the swirl ratio of the transient swirl ratio and the optimum swirl ratio is qualified;
and if the swirl ratio difference is greater than or equal to a swirl ratio threshold value, determining that the swirl ratio of the transient swirl ratio and the optimum swirl ratio is unqualified.
8. A system for evaluating performance of an intake port of a diesel engine, comprising:
the model building module is used for obtaining engine parameter information of the diesel engine to be evaluated and building an engine combustion model according to the engine parameter information;
the swirl ratio determining module is used for determining the optimal swirl ratio of the diesel engine to be evaluated according to the engine combustion model and constructing an air passage steady-state model according to the air passage information of the diesel engine to be evaluated;
the characteristic evaluation module is used for determining the average swirl ratio and the flow coefficient of the air passage of the diesel engine to be evaluated according to the steady-state model of the air passage and evaluating the characteristics of the air passage of the diesel engine to be evaluated according to the average swirl ratio and the flow coefficient of the air passage;
the eddy current comparison module is used for acquiring a transient eddy current ratio of the diesel engine to be evaluated at the closing moment of an inlet valve if the air passage characteristic evaluation of the air inlet passage of the diesel engine to be evaluated is qualified, and performing eddy current comparison on the transient eddy current ratio and the optimal eddy current ratio; and if the transient vortex ratio is qualified by the vortex ratio of the optimal vortex ratio, judging that the performance evaluation of the air inlet passage of the diesel engine to be evaluated is qualified.
9. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
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