Engine combustion chamber spray hole numerical value processing method, device and equipment and storage medium

Abstract

In order to overcome the defects that in the prior art, structural grid design and partition complexity is high, universality is not high and data orthogonality is poor, the invention provides an engine combustion chamber spray hole numerical value processing method, device and equipment and a storage medium, and the method comprises the steps that a three-dimensional configuration is determined for an engine combustion chamber through spatial structure modeling; drawing a structured grid of the three-dimensional configuration, and partitioning the structured grid by adopting rectangular segmentation; through a layered comparison screening correction method, grid nodes falling into the spray hole range in all the partitions are judged and screened, and the partitions suitable for spray hole boundary conditions and the grid nodes in the structural grids are identified according to the grid nodes; and finally, performing flow field updating and iterative calculation of numerical simulation based on numerical processing and boundary conditions at the spray holes after the structural grid division to realize numerical simulation of fuel injection. The method is simple to execute, high in numerical value processing efficiency and precision quality and high in algorithm universality.

Description

Technical Field

[0001] The invention relates to the field of fluid mechanics, in particular to the field of flow combustion engines, and specifically to a method, device, equipment and storage medium suitable for numerical processing of spray holes in engine combustion chambers. Background Art

[0002] With the rapid development of computer technology, numerical simulation methods have become an important research tool in the field of fluid mechanics. There are three main types of numerical simulation methods commonly used in computational fluid dynamics: direct numerical simulation (DNS), which directly solves fluid dynamics of all scales; large eddy simulation (LES), which directly solves large-scale motion and only models small-scale pulsations, with good resolution and moderate computational complexity; Reynolds average simulation (RANS), which models and solves motions of all scales, with minimal computational complexity. Based on the above characteristics, high-precision LES has become the mainstream method for aircraft development, especially for flow and combustion mechanism research.

[0003] When performing the above-mentioned numerical simulation on the physical process of fuel injection in the engine combustion chamber, it is necessary to first grid the numerical simulation calculation domain determined by the actual configuration of the engine combustion chamber. In particular, the gridding numerical processing results of the nozzle hole have an important influence on the numerical simulation effect of the flow control of fuel injection.

[0004] Grid numerical processing generally includes structured grid processing and unstructured grid processing. A structured grid means that all internal points in the grid area have the same adjacent cells. Compared with unstructured grids, the grid nodes of structured grids can be stored in the form of two-dimensional or three-dimensional arrays, without the need to store the connection relationship between different grid nodes. It has a simple data structure, fast grid generation speed, and generally good grid quality. It is suitable for situations with high requirements for calculation accuracy such as surface friction and surface heat flow. In particular, for LES numerical simulation methods with high precision requirements, structured grids are mostly used to match their requirements for high-precision numerical formats.

[0005] At present, as a common fuel adding method for internal combustion engines, nozzles have various shapes, such as rectangular, elliptical, circular, and petal-shaped. The most commonly used nozzle shape in practical applications is circular. For the calculation domain of the circular nozzle part, when processing the structured grid, such as Figure 2 As shown, a type 0 grid with 5 sub-partitions is generally used for numerical processing, with the middle rectangular sub-partition as the center and the other four fan-shaped sub-partitions distributed around it. Each sub-partition is delimited by an integer boundary condition. When the boundary conditions are updated in the subsequent numerical simulation solution process, the grid is assigned a value, and the assignment parameters are determined by physical quantities such as density, velocity, and pressure of the given fuel nozzle.

[0006] In the above-mentioned nozzle numerical processing method, in order to maintain the structural grid characteristics, the nozzle is usually divided into multiple sub-partitions, and the directional matching of the sub-partition grids needs to be finely processed, which makes the grid drawing more complicated and is not suitable for multiple nozzles or more complex shapes; at the junction of the sub-partition boundaries of the nozzle calculation domain grid, the orthogonality of the grid is difficult to ensure, which will affect the quality of the numerical solution with high precision requirements; further, this type of nozzle grid is highly correlated with the adjacent grids. When the nozzle changes in application situations such as size changes, the entire calculation domain grid needs to be redrawn, making the grid division in the above-mentioned nozzle numerical processing method not very versatile; when performing large-scale parallel computing, it is generally necessary to ensure that the nozzle grid is located in the same partition to facilitate boundary condition processing, which brings additional constraints to the grid partition and increases the difficulty of partitioning during parallel computing. Therefore, it is an urgent problem to be solved by technicians in this field to provide a nozzle numerical processing method with lower grid drawing complexity, both grid division versatility and grid numerical solution quality, and easier partition processing. Summary of the invention

[0007] In view of this, in order to solve the problems existing in the prior art, the present invention provides a method, device, equipment and storage medium for numerical processing of engine combustion chamber nozzles, so as to improve the versatility of the grid division method in the numerical simulation and the accuracy quality of the grid numerical simulation on the basis of reducing the complexity of the numerical simulation algorithm.

[0008] A method for numerical processing of a nozzle hole in an engine combustion chamber, the specific technical solution includes: Step S1000, performing spatial structural modeling on an engine combustion chamber to be numerically simulated to obtain a three-dimensional configuration of the engine combustion chamber, wherein the engine combustion chamber includes a nozzle for fuel injection; Step S1100, gridding the three-dimensional configuration of the engine combustion chamber to obtain a structural grid of the three-dimensional configuration of the engine combustion chamber, partitioning the structural grid, and recording and storing all the partitioned grid node data; Step S1200, based on the hierarchical comparison screening correction method, determine and screen the partitions containing the nozzle grid nodes and the grid nodes in the partitions that fall within the nozzle range, and identify the partitions and grid nodes in the structural grid that are applicable to the physical boundary conditions at the nozzle; the hierarchical comparison screening correction method performs data screening and identification correction by respectively setting a first evaluation parameter for partition judgment and a second comparison evaluation parameter for grid node judgment, and setting a two-dimensional parameter correction array; Step S1300, based on the structural grid and partitions as well as the numerical processing and boundary conditions at the nozzle hole, the flow field of the numerical simulation is updated and iteratively calculated to realize the numerical simulation of the fuel injection in the combustion chamber.

[0009] Specifically, in step S1000, the engine combustion chamber also includes a concave cavity for promoting mixing and improving flame stabilization capability, as well as a combustion chamber inlet, a combustion chamber outlet, an upper wall, a lower wall, a front side wall and a rear side wall.

[0010] Furthermore, in step S1100, the structure grid is a rectangular grid, and the partitioning method of the structure grid by rectangular partitioning ensures that the number of grids contained is equal or the difference in the number of grids in each partition is within a set range, so that the calculation load of each partition is basically balanced; the partition number , is the total number of partitions; each partition is a three-dimensional hexahedral space.

[0011] Preferably, in step S1200, the stratified comparison screening correction method specifically includes: Step S1210, the partitions including the nozzle grid nodes and the The identification results of the grid nodes in the partitions that fall within the nozzle range are recorded in a one-dimensional array and a three-dimensional array , the initial values ​​of all its components are set to 0; Step S1220, by calculating the first layer comparison evaluation parameters The value of Whether the bottom surface of each partition is in the same spatial plane as the nozzle hole; if , then they fall into the same plane and execute the next step S1230; if , then they do not fall into the same plane, and subsequent steps are not executed, and step S1220 is executed again for the next partition; Step S1230, determine Whether the grid nodes in the partition are grid nodes in the nozzle grid, and The correction data is recorded, including: Step S1231: Set the second layer comparison evaluation parameters according to the coordinate information , determine the Whether the grid nodes in a partition fall into the plane where the nozzle grid is located; if , indicating that the grid node falls into the plane where the nozzle grid is located, then the next step S1232 is executed. If , then the loop is jumped out and the process returns to step S1231 to execute the determination of the next grid node in the same partition; Step S1232, set a two-dimensional parameter correction array , used to identify whether the grid node located in the same plane as the nozzle grid falls within the nozzle range; if , then the grid node falls within the nozzle range, if , then the grid node does not fall into the nozzle range and is not a grid node in the nozzle grid; The value correction corresponds to the grid node located in the same plane as the nozzle grid. value; Step S1240, using the above two-dimensional array data Correction Assignment of Step S1250, based on the data after the numerical processing and the correction adjustment, including the corrected data obtained in step S1240 The corrected value obtained in step S1232 Value, when and When The boundary conditions of the mesh nodes at the location apply the physical boundary conditions at the nozzle.

[0012] Preferably, use integer indices Calibrate the mesh nodes at The position in the partition, then the first layer comparison evaluation parameter in step S1220 Given by:

[0013] in, It is Partitions in three-dimensional coordinate space Medium Grid Node The spatial coordinates of is the coordinate of the center of the circular nozzle; ,in , , Respectively represent The partitions are along The total number of structural mesh nodes contained in the three directions.

[0014] Preferably, in step S1231, In the partition The second layer comparison judgment parameter of whether the position grid node falls into the plane where the nozzle grid is located , which is given by the following formula:

[0015] Preferably, in step S1232, A two-dimensional parameter correction array that determines whether the grid nodes in the same plane as the nozzle grid in the partition fall within the nozzle range. , is given by:

[0016] use The value correction corresponds to the mesh nodes on the same plane as the nozzle mesh of The correction process is given by the following formula: .

[0017] Preferably, in step S1240, the two-dimensional array data is used Correction The specific correction formula is:

[0018] In another embodiment, the numerical processing method for the engine combustion chamber nozzle is designed according to the different combustion chamber structures and nozzle position settings, and a layered comparison screening correction method with different first comparison and judgment parameters, second-layer comparison and judgment parameters and two-dimensional parameter correction arrays is used to judge and identify the partitions containing the nozzle grid nodes and the grid nodes in the partitions that fall within the nozzle range.

[0019] The present invention also protects a numerical processing device for a nozzle hole in an engine combustion chamber, the device comprising: The first module, a spatial configuration module, is used to perform spatial structural modeling on an engine combustion chamber to be numerically simulated to obtain a three-dimensional configuration of the engine combustion chamber, wherein the engine combustion chamber includes a nozzle for fuel injection; The second module, the structural grid and partitioning module, is used to grid the three-dimensional configuration of the engine combustion chamber, obtain the structural grid of the three-dimensional configuration of the engine combustion chamber, perform rectangular partitioning on the structural grid, and record and store all the partitioned grid node data; The third module, the evaluation and identification module, is based on the hierarchical comparison screening and correction method, and is used to judge and screen the partitions containing the nozzle grid nodes, and the grid nodes in the partitions that fall within the nozzle range, and identify the partitions and grid nodes in the structural grid that are applicable to the physical boundary conditions at the nozzle; the hierarchical comparison screening and correction method performs data screening and identification correction by respectively setting the first evaluation parameter for partition judgment and the second comparison evaluation parameter for grid node judgment, and setting a two-dimensional parameter correction array; The fourth module, the fuel injection numerical simulation module, is used to perform numerical simulation flow field update and iterative calculation based on the structural grid and partitions as well as the numerical processing and boundary conditions at the nozzle hole to realize the numerical simulation of fuel injection in the combustion chamber.

[0020] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented: Step S1000, performing spatial structural modeling on an engine combustion chamber to be numerically simulated to obtain a three-dimensional configuration of the engine combustion chamber, wherein the engine combustion chamber includes a nozzle for fuel injection; Step S1100, gridding the three-dimensional configuration of the engine combustion chamber to obtain a structural grid of the three-dimensional configuration of the engine combustion chamber, partitioning the structural grid, and recording and storing all the partitioned grid node data; Step S1200, based on the hierarchical comparison screening correction method, determine and screen the partitions containing the nozzle grid nodes and the grid nodes in the partitions that fall within the nozzle range, and identify the partitions and grid nodes in the structural grid that are applicable to the physical boundary conditions at the nozzle; the hierarchical comparison screening correction method performs data screening and identification correction by respectively setting a first evaluation parameter for partition judgment and a second comparison evaluation parameter for grid node judgment, and setting a two-dimensional parameter correction array; Step S1300, based on the structural grid and partitions as well as the numerical processing and boundary conditions at the nozzle hole, the flow field of the numerical simulation is updated and iteratively calculated to realize the numerical simulation of the fuel injection in the combustion chamber.

[0021] A storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the following steps are implemented: Step S1000, performing spatial structural modeling on an engine combustion chamber to be numerically simulated to obtain a three-dimensional configuration of the engine combustion chamber, wherein the engine combustion chamber includes a nozzle for fuel injection; Step S1100, gridding the three-dimensional configuration of the engine combustion chamber to obtain a structural grid of the three-dimensional configuration of the engine combustion chamber, partitioning the structural grid, and recording and storing all the partitioned grid node data; Step S1200, based on the hierarchical comparison screening correction method, the partitions containing the nozzle grid nodes and the grid nodes in the partitions that fall within the nozzle range are judged and screened, and the partitions and grid nodes in the structural grid that are applicable to the physical boundary conditions at the nozzle are identified accordingly; the hierarchical comparison screening correction method performs data screening and identification correction by respectively setting a first evaluation parameter for partition judgment and a second comparison evaluation parameter for grid node judgment, and setting a two-dimensional parameter correction array; Step S1300, based on the structural grid and partitions as well as the numerical processing and boundary conditions at the nozzle hole, the flow field of the numerical simulation is updated and iteratively calculated to realize the numerical simulation of the fuel injection in the combustion chamber.

[0022] In summary, the present invention proposes a method, device, equipment and storage medium for numerically processing a nozzle hole used in the process of numerically simulating the physical process of fuel injection in an engine combustion chamber. Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The structural grid mode and rectangular partitioning method were selected. This method is simple to operate and has the advantages of good stability, high precision, and fast convergence speed. It effectively reduces the complexity of grid drawing during the numerical simulation process; this structural grid mode combined with the rectangular partitioning method most effectively guarantees the orthogonality of almost all grid nodes, especially at the partition boundaries of the calculation domain of the nozzle part. Due to the simplicity of the gridding process and partitioning method, the versatility of the algorithm is improved.

[0023] 2. The structural grid and rectangular partitioning method ensure that the nozzle area uses the same grid partitioning method as other combustion chamber positions, and the nozzle grid partitioning does not require special processing. This grid partitioning is simpler than the existing technology.

[0024] 3. When dealing with the special physical boundary conditions of the nozzle, a hierarchical comparison, screening and correction method is designed by setting the first and second comparison evaluation parameters and a two-dimensional parameter correction array at the partition layer and grid node layer respectively to perform data screening and identification correction. Compared with the existing technology and conventional traversal algorithm, it greatly reduces the amount of data for numerical processing, reduces the time complexity of the algorithm, and improves data processing efficiency and accuracy quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A flow chart of a method for numerically processing a nozzle hole in a combustion chamber of an engine in one embodiment; Figure 2 The schematic diagram of the 0-type structure grid and partition drawn for the circular nozzle in the prior art; Figure 3 A schematic diagram of the structure of a ramjet combustion chamber in one embodiment; Figure 4 A schematic diagram of partitioning an engine combustion chamber in one embodiment; Figure 5 A schematic diagram of dividing an engine combustion chamber into rectangular structure grids in one embodiment; Figure 6 A possible partition boundary and grid schematic diagram of a local area of ​​a nozzle hole in one embodiment; Figure 7 The local area of ​​the nozzle hole in one embodiment and Identify the results.

[0026] Figures 1 to 6 Explanation of the reference numerals in the figure: 1 is a ramjet combustion chamber, 2 is a combustion chamber nozzle, 3 is a concave cavity of the combustion chamber, 4 is a combustion chamber inlet, 5 is a combustion chamber outlet, 6 is an upper wall surface, 7 is a lower wall surface, 8 is a front side wall surface, and 9 is a rear side wall surface. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] The present invention provides an engine combustion chamber spray hole numerical processing method for numerically simulating the fuel injection process of the engine combustion chamber, and obtains a better fuel injection flow control numerical simulation effect by performing effective structural gridding numerical processing on the combustion chamber spray hole.

[0029] Reference Figure 1 In one embodiment, a method for numerically processing a nozzle hole in an engine combustion chamber is provided. Figure 3 Taking the ramjet combustion chamber 1 in the embodiment as an example, the method comprises the following steps: Step S1000, performing spatial structural modeling on an engine combustion chamber 1 to be numerically simulated to obtain a three-dimensional configuration of the engine combustion chamber, wherein the engine combustion chamber 1 includes a nozzle 2 for fuel injection; Step S1100, gridding the three-dimensional configuration of the engine combustion chamber to obtain a structural grid of the three-dimensional configuration of the engine combustion chamber, partitioning the structural grid, and recording and storing all the partitioned grid node data; Step S1200, based on the hierarchical comparison screening correction method, determine and screen the partitions containing the nozzle grid nodes and the grid nodes in the partitions that fall within the nozzle range, and identify the partitions and grid nodes in the structural grid that are applicable to the physical boundary conditions at the nozzle; the hierarchical comparison screening correction method performs data screening and identification correction by respectively setting a first evaluation parameter for partition judgment and a second comparison evaluation parameter for grid node judgment, and setting a two-dimensional parameter correction array; Step S1300, based on the structural grid and partitions as well as the numerical processing and boundary conditions at the nozzle hole, the flow field of the numerical simulation is updated and iteratively calculated to realize the numerical simulation of the fuel injection in the combustion chamber.

[0030] Specifically, in step S1000, if Figure 3 As shown, the engine combustion chamber 1 also includes a concave cavity 3 for promoting mixing and improving flame stabilization capability, as well as a combustion chamber inlet 4, a combustion chamber outlet 5, an upper wall 6, a lower wall 7, a front side wall 8 and a rear side wall 9.

[0031] Further, in step S1100, the process of obtaining the structural grid includes using grid processing software such as Pointwise; Figure 4 and Figure 5As shown, the structural grid is a rectangular grid. The partitioning method of dividing the structural grid into rectangles ensures that the number of grids included is equal or the difference in the number of grids in each partition is within a set range, so that the calculation load of each partition is basically balanced; the partition number , is the total number of partitions, ; Each partition is a three-dimensional hexahedral space.

[0032] Preferably, in order to meet the requirements of numerical simulation for high-precision numerical solution, generally, the local area of ​​the nozzle of the structural grid is encrypted so that the number of grids in the nozzle is not less than 50.

[0033] Preferably, step S1200 determines and screens the first The grid nodes in the partition that fall within the nozzle range are used to determine the The specific numerical processing and judgment process of the hierarchical comparison and screening correction method includes: Step S1210: store the identification results of whether all partitions contain nozzle grid nodes in a one-dimensional array , ,like , indicating the A partition contains the grid nodes within the nozzle range. , it is not included; The identification results of whether all grid nodes in a partition fall within the nozzle range are stored in a three-dimensional array , where the integer index Used to calibrate the position of the grid node in the partition; and Each parameter and Set the initial value to 0; Step S1220, define the first level comparison evaluation parameters , by calculating , judging whether the bottom surface of the partition and the nozzle hole are located in the same spatial plane; , then they fall into the same plane, and the next step S1230 is executed; , then it does not fall into the same plane, the subsequent steps are not executed, and the next partition is jumped back to S1220 for re-determination; Step S1230, determine Whether the grid nodes in the partition are grid nodes in the nozzle grid, and The correction data is recorded, including: Step S1231, determining the partition according to the coordinate information Whether the grid node at the position falls into the plane where the nozzle grid is located, , , , Respectively represent The partitions are along The total number of structural grid nodes contained in the three directions; set the second-level comparison evaluation parameters ,like , indicating that the grid node falls into the plane where the nozzle grid is located, then the next step S1232 is executed. If , then the loop is jumped out and the process returns to step S1231 to execute the determination of the next grid node in the same partition; Step S1232: The grid nodes selected in step S1231 are in the same plane as the nozzle grid and can be excluded. Directional information interference, so a two-dimensional parameter correction array is defined , used to identify whether the grid node located in the same plane as the nozzle grid falls within the nozzle range; if , then the grid node falls within the nozzle range, if , then the grid node does not fall into the nozzle range and is not a grid node in the nozzle grid; The value correction corresponds to the grid node located in the same plane as the nozzle grid. value; Step S1240, using the above two-dimensional array data Correction The specific correction formula is: (1) Step S1250, based on the data after the numerical processing and the correction adjustment, including the corrected data obtained in step S1240 The corrected value obtained in step S1232 ,like Figure 7 The figure shows the local area of ​​the nozzle hole in one embodiment. and The identification results are shown in the figure That is to say ,when and When , the grid node The boundary conditions at the nozzle hole apply the physical boundary conditions at the nozzle hole.

[0034] Specifically, in step S1200, the boundary conditions applicable to the grid nodes include solid wall boundaries, internal boundaries, and nozzle boundaries. The solid wall boundary refers to the solid surface of the cavity enclosed by the entire engine combustion chamber, including the concave solid wall, upper and lower walls, and front and rear side walls of the combustion chamber; the internal boundary refers to the non-solid entity boundary inside the combustion chamber that reflects the physical combustion process of the fuel and the partition. Taking the partition where the nozzle is located as an example, a possible partition is as follows Figure 6 As shown in the figure, among the six surfaces of the partition, the front, back and bottom surfaces are solid wall boundaries, while the other three surfaces are defined as internal boundaries, and the nozzle boundary conditions apply to the nozzle itself.

[0035] Preferably, in step S1220, the first layer is compared and evaluated by directly comparing the coordinates. Assign values; specifically, let In the partition The spatial coordinates of the grid nodes at are , if the coordinates of the center of the circular nozzle are ,but (2) Similarly, in step S1231, by comparing Direction coordinates and , gives the judgment result of whether the grid node falls into the plane where the nozzle grid is located: (3) Preferably, the correction array in step S1232 is used ,Record All grid nodes in the partition that satisfy the above formula (3) fall into the nozzle range. Specifically, (4) Further, using the above right Make corrections, (5) The nozzle numerical processing method used in the numerical simulation of the above-mentioned engine combustion chamber adopts a rectangular grid structured grid mode and a rectangular partitioning method. This method ensures the orthogonality of almost all grid nodes, especially the partition boundaries of the nozzle part calculation domain in an optimal way, and can perform fine segmentation and partitioning with sufficient accuracy requirements. Therefore, it has the advantages of good stability, high accuracy, and fast convergence speed. It effectively reduces the complexity of grid drawing during the numerical simulation process; due to the simplicity of the gridding process and partitioning method, the versatility of the algorithm is effectively improved; because the nozzle adopts the same grid division method as other combustion chamber positions, the partition of the nozzle grid does not require special processing, and this grid partitioning is simpler than the existing technology.

[0036] In particular, when dealing with the special physical boundary conditions of the nozzle, a hierarchical comparison and screening correction method is designed in the nozzle numerical processing process, which specifically includes steps S1210-S1250. Compared with the direct traversal algorithm, it greatly reduces the time complexity of the algorithm and can effectively improve the operating efficiency and accuracy of the numerical simulation. The specific process of hierarchical comparison and screening includes: in step S1220, the first layer comparison and evaluation parameters are compared. The value determines whether the bottom surface of each partition is located in the same spatial plane as the nozzle hole, and selects all partitions whose bottom surfaces are located in the same spatial plane as the nozzle hole; in step S1231, the second layer comparison judgment parameter Value judgment partition Medium Grid Node Whether it falls into the plane where the nozzle grid is located, filter partition All mesh nodes that fall into the plane where the nozzle mesh is located.

[0037] In another embodiment, the type of engine combustion chamber that is applicable can be changed, such as the main structure of the combustion chamber and the setting of the nozzle position. The nozzle numerical processing method adopted is basically the same as the nozzle numerical processing method in the previous embodiment. Specifically, when judging the data for hierarchical comparison, judgment and screening in steps S1220-S1240, and selecting a two-dimensional correction array for data correction, it is necessary to design different judgment parameters and correction parameter formulas (2)-formula (5) according to specific situations. Similarly, the same beneficial effects as in the previous embodiment can be obtained in specific situations.

[0038] In one embodiment, a numerical processing device for a nozzle of an engine combustion chamber is provided, comprising: a spatial configuration module, a structural grid and partitioning module, a judgment identification module and a fuel injection numerical simulation module, wherein: The first module: a spatial configuration module, which is used to perform spatial structural modeling on the engine combustion chamber to be numerically simulated, and obtain a three-dimensional configuration of the engine combustion chamber, wherein the engine combustion chamber includes a nozzle for fuel injection; The second module: a structural grid and partitioning module, which is used to grid the three-dimensional configuration of the engine combustion chamber, obtain the structural grid of the three-dimensional configuration of the engine combustion chamber, partition the structural grid into rectangular partitions, and record and store all the partitioned grid node data; The third module: a judgment and identification module, based on a hierarchical comparison screening and correction method, is used to judge and screen the partitions containing the nozzle grid nodes, and the grid nodes in the partitions that fall within the nozzle range, and identify the partitions and grid nodes in the structural grid that are suitable for the physical boundary conditions at the nozzle; the hierarchical comparison screening and correction method performs data screening and identification correction by respectively setting a first judgment parameter for partition judgment and a second comparison judgment parameter for grid node judgment, and setting a two-dimensional parameter correction array; The fourth module: a fuel injection numerical simulation module, which is used to update and iteratively calculate the numerical simulation flow field based on the structural grid and partitions as well as the numerical processing and boundary conditions at the nozzle hole, so as to realize the numerical simulation of fuel injection in the combustion chamber.

[0039] In one embodiment, a computer device is provided, which may be a server, and the device includes a processor, a memory, a grid interface, and a database connected via a system bus. The processor of the device is used to provide computing and control capabilities. The memory of the device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the device is used to store numerical processing data of the engine combustion chamber nozzle. The grid interface of the device is used to communicate with an external terminal via a grid connection. When the computer program is executed by the processor, a method for numerical processing of the engine combustion chamber nozzle is implemented.

[0040] Those skilled in the art will appreciate that the description of the technical features of the devices in the above embodiments does not constitute a limitation on all devices to which the present invention is applied, and a specific device may include more or fewer components, or combine certain components, or have a different arrangement of components.

[0041] In one embodiment, a storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented: Step S1000, performing spatial structural modeling on an engine combustion chamber to be numerically simulated to obtain a three-dimensional configuration of the engine combustion chamber, wherein the engine combustion chamber includes a nozzle for fuel injection; Step S1100, gridding the three-dimensional configuration of the engine combustion chamber to obtain a structural grid of the three-dimensional configuration of the engine combustion chamber, partitioning the structural grid, and recording and storing all the partitioned grid node data; Step S1200, based on the hierarchical comparison screening correction method, determine and screen the partitions containing the nozzle grid nodes and the grid nodes in the partitions that fall within the nozzle range, and identify the partitions and grid nodes in the structural grid that are applicable to the physical boundary conditions at the nozzle; the hierarchical comparison screening correction method performs data screening and identification correction by respectively setting a first evaluation parameter for partition judgment and a second comparison evaluation parameter for grid node judgment, and setting a two-dimensional parameter correction array; Step S1300, based on the structural grid and partitions as well as the numerical processing and boundary conditions at the nozzle hole, the flow field of the numerical simulation is updated and iteratively calculated to realize the numerical simulation of the fuel injection in the combustion chamber.

[0042] A person of ordinary skill in the art can understand that all or part of the processes for implementing the above-mentioned embodiment methods can be completed by instructing related hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods.

[0043] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A method for numerical processing of a nozzle of an engine combustion chamber, characterized in that: The method comprises the following steps: Step S1000, performing spatial structural modeling on an engine combustion chamber to be numerically simulated to obtain a three-dimensional configuration of the engine combustion chamber, wherein the engine combustion chamber includes a nozzle (2) for fuel injection; Step S1100, gridding the three-dimensional configuration of the engine combustion chamber to obtain a structural grid of the three-dimensional configuration of the engine combustion chamber, partitioning the structural grid into rectangular partitions, and recording and storing all partitioned grid node data; Step S1200, based on the hierarchical comparison screening correction method, determine and screen the partitions containing the nozzle grid nodes and the grid nodes in the partitions that fall within the nozzle range, and identify the partitions and grid nodes in the structural grid that are applicable to the physical boundary conditions at the nozzle; The hierarchical comparison screening and correction method performs data screening and identification correction by respectively setting a first evaluation parameter for partition judgment and a second comparison evaluation parameter for grid node judgment, and setting a two-dimensional parameter correction array; Step S1300, based on the structural grid and partitions as well as the numerical processing and boundary conditions at the nozzle hole, the flow field of the numerical simulation is updated and iteratively calculated to realize the numerical simulation of the fuel injection in the combustion chamber.

2. The method for numerical processing of the nozzle of the engine combustion chamber according to claim 1, characterized in that: In step S1000, the engine combustion chamber further comprises a concave cavity (3) for promoting mixing and improving flame stabilization capability, as well as a combustion chamber inlet (4), a combustion chamber outlet (5), an upper wall surface (6), a lower wall surface (7), a front side wall surface (8) and a rear side wall surface (9).

3. The method for numerical processing of the nozzle of the engine combustion chamber according to claim 2, characterized in that: In step S1100, the structure grid is a rectangular grid; the partitioning method ensures that the number of grids contained in each partition is equal or the difference in the number of grids in each partition is within a set range, so that the calculation load of each partition is basically balanced; the partition number , is the total number of partitions; the partitioning method makes each partition a three-dimensional hexahedral space.

4. The method for numerical processing of the nozzle of the engine combustion chamber according to claim 3, characterized in that: The stratified comparative screening correction method specifically includes: Step S1210, the partitions including the nozzle grid nodes and the The identification results of the grid nodes in the partitions that fall within the nozzle range are recorded in a one-dimensional array and a three-dimensional array , the initial values ​​of all its components are set to 0; Step S1220, by calculating the first layer comparison evaluation parameters The value of Whether the bottom surface of each partition is in the same spatial plane as the nozzle hole; if , then they fall into the same plane and continue to the next step S1230; if , then they do not fall into the same plane, and subsequent steps are not executed. Re-execute step S1220 for each partition; Step S1230, determine Whether the grid nodes in the partition are grid nodes in the nozzle grid, and The correction data is recorded, including: Step S1231: Set the second layer comparison evaluation parameters according to the coordinate information , determine the Whether the grid nodes in a partition fall into the plane where the nozzle grid is located; if , indicating that the grid node falls into the plane where the nozzle grid is located, then the next step S1232 is executed. , then the loop is jumped out and the process returns to step S1231 to execute the determination of the next grid node in the same partition; Step S1232, define a two-dimensional parameter correction array , used to identify whether the grid node located in the same plane as the nozzle grid falls within the nozzle range; if , then the grid node falls within the nozzle range, if , then the grid node does not fall into the nozzle range and is not a grid node in the nozzle grid; The value correction corresponds to the grid node located in the same plane as the nozzle grid. value; Step S1240, using the above two-dimensional array data Correction Assignment of Step S1250, based on the data after the numerical processing and the correction adjustment, including the corrected data obtained in step S1240 The corrected value obtained in step S1232 Value, when and When The boundary conditions of the mesh nodes at the location apply the physical boundary conditions at the nozzle.

5. The method for numerical processing of the nozzle holes of the engine combustion chamber according to claim 4, characterized in that: The first layer comparison evaluation parameters Given by: in, It is The partitions are in the three-dimensional coordinate space Medium Grid Node The spatial coordinates of is the coordinate of the center of the circular nozzle, is an integer index used to calibrate the position of the grid node in the partition. ,in , , Respectively represent The partitions are along The total number of structural grid nodes contained in the three directions; The second layer comparison evaluation parameters Given by: To judge the In the partition Whether the grid node at the position falls into the plane where the nozzle grid is located.

6. The method for numerical processing of the nozzle holes of the engine combustion chamber according to claim 5, characterized in that: The two-dimensional parameter correction array Given by: use Correction corresponds to the mesh nodes on the same plane as the nozzle mesh of The specific process is given by the following formula: 。 7. The method for numerical processing of the nozzle holes of the engine combustion chamber according to claim 1, characterized in that: According to the different combustion chamber structures and nozzle position settings, a hierarchical comparison screening correction method with different first comparison and evaluation parameters, second-layer comparison and evaluation parameters and two-dimensional parameter correction arrays is designed to judge and identify the partitions containing nozzle grid nodes and the grid nodes in the partitions that fall within the nozzle range.

8. A numerical processing device for a nozzle of an engine combustion chamber, characterized in that: include: The first module, a spatial configuration module, is used to perform spatial structural modeling on an engine combustion chamber to be numerically simulated to obtain a three-dimensional configuration of the engine combustion chamber, wherein the engine combustion chamber includes a nozzle for fuel injection; The second module, the structural grid and partitioning module, is used to grid the three-dimensional configuration of the engine combustion chamber, obtain the structural grid of the three-dimensional configuration of the engine combustion chamber, perform rectangular partitioning on the structural grid, and record and store all the partitioned grid node data; The third module, the evaluation and identification module, is based on the hierarchical comparison screening and correction method, and is used to judge and screen the partitions containing the nozzle grid nodes, and the grid nodes in the partitions that fall within the nozzle range, and thereby identify the partitions and grid nodes in the structural grid that are applicable to the physical boundary conditions at the nozzle; The hierarchical comparison screening and correction method performs data screening and identification correction by respectively setting a first evaluation parameter for partition judgment and a second comparison evaluation parameter for grid node judgment, and setting a two-dimensional parameter correction array; The fourth module, the fuel injection numerical simulation module, is used to perform numerical simulation flow field update and iterative calculation based on the structural grid and partitions as well as the numerical processing and boundary conditions at the nozzle hole to realize the numerical simulation of fuel injection in the combustion chamber.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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