A method and device for testing and verifying an engine air passage

Abstract

The present application provides a method for testing and verifying an engine air passage. First, a three-dimensional model and a casting design of a first cylinder head are obtained. Then, based on the casting design and the three-dimensional model of the first cylinder head, a cylinder head deformation result is obtained through simulation. Next, a three-dimensional model of a second cylinder head is obtained based on the cylinder head deformation result. Finally, a physical model of the three-dimensional model of the second cylinder head is manufactured by stereolithography; the physical model is used for engine air passage testing, so as to realize the rapid manufacturing and experimental testing of the engine air passage through stereolithography technology. In this way, by obtaining the cylinder head deformation result through simulation software and the physical model of the deformed cylinder head manufactured by stereolithography, the casting deformation factor is brought forward and the rapid manufacturing and experimental testing of the engine air passage are realized, achieving the effect of rapidly testing the performance indexes of the air passage on the premise of ensuring dimensional consistency. In this way, the development efficiency of the engine air passage can be improved and the development cost can be reduced.

Description

Technical Field

[0001] This application relates to the technical field of engines, and particularly to a method and device for testing and verifying an engine air passage. Background Art

[0002] With the rapid development of technology and the continuous improvement of consumer demands, engines have also witnessed rapid development. Among them, a reasonable airway structure design is of great significance for developing high-performance engines.

[0003] The existing technology uses computational fluid dynamics simulation software and analysis tools to conduct factor analysis, makes a physical model based on 3D printed sand cores, and analyzes the differences between the final product and the original design by scanning the physical model and comparing it with the original model. However, since this process requires waiting for the manufacture of the cylinder head product and its mold needs to be continuously modified, the manufacturing cycle is long, and due to the advantages of 3D printing technology, there are differences between the 3D printed sand cores and the casting process of actual mass-produced products, resulting in a long airway design and development cycle and consuming a large amount of development costs.

[0004] Therefore, there is an urgent need to propose a method and device for testing and verifying an engine airway to solve the above technical problems. Summary of the Invention

[0005] In view of this, this application provides a method and device for testing and verifying an engine airway, aiming to improve the efficiency of engine airway development and reduce development costs.

[0006] In a first aspect, this application provides a method for testing and verifying an engine airway, including:

[0007] Obtain a three-dimensional model of a first cylinder head and a casting design;

[0008] Based on the casting design and the three-dimensional model of the first cylinder head, obtain a cylinder head deformation result through simulation;

[0009] Based on the cylinder head deformation result, obtain a three-dimensional model of a second cylinder head;

[0010] Manufacture a physical model of the three-dimensional model of the second cylinder head through stereolithography; the physical model is used for engine airway testing.

[0011] Optionally, the obtaining of the three-dimensional model of the first cylinder head and the casting design includes:

[0012] Construct a three-dimensional model of the first cylinder head model;

[0013] Based on the three-dimensional model of the first cylinder head model, conduct sand core design and casting process design according to the actual casting process of the cylinder head;

[0014] Obtain the three-dimensional model of the core through the described core design;

[0015] Obtain the casting process parameters through the described casting process design.

[0016] Optionally, the obtaining of the cylinder head deformation result by simulation based on the casting design and the three-dimensional model of the first cylinder head includes:

[0017] Obtain the cylinder head deformation result through finite element simulation and / or finite difference simulation and / or finite volume simulation based on the casting design and the three-dimensional model of the first cylinder head.

[0018] Optionally, the obtaining of the cylinder head deformation result by simulation based on the casting design and the three-dimensional model of the first cylinder head includes:

[0019] Perform filling, solidification and stress calculation on the first cylinder head through simulation based on the casting design;

[0020] Obtain the cylinder head deformation result according to the filling, solidification and stress calculation of the first cylinder head and the three-dimensional model of the first cylinder head.

[0021] Optionally, the forming material of the physical model of the three-dimensional model of the second cylinder head manufactured by the stereolithography method is a transparent material.

[0022] Optionally, the method further includes:

[0023] Process the physical model and assemble it onto the air passage blowing test bench;

[0024] Obtain the swirl ratio and flow coefficient of the air passage through testing;

[0025] Obtain the verification result of the engine air passage based on the swirl ratio and the flow coefficient.

[0026] In a second aspect, the present application provides a test verification device for an engine air passage, including:

[0027] An acquisition module for acquiring the three-dimensional model of the first cylinder head and the casting design;

[0028] A simulation module for obtaining the cylinder head deformation result through simulation based on the casting design and the three-dimensional model of the first cylinder head;

[0029] A determination module for obtaining the three-dimensional model of the second cylinder head based on the cylinder head deformation result;

[0030] A manufacturing module for manufacturing the physical model of the three-dimensional model of the second cylinder head by the stereolithography method; the physical model is used for engine air passage testing.

[0031] In a third aspect, the present application provides a test and verification system for an engine air passage. The system includes: a computer, a stereolithography apparatus, and a test device; the computer is respectively connected to the stereolithography apparatus and the test device;

[0032] The computer is configured to obtain a three-dimensional model of a first cylinder head and a casting design, obtain a cylinder head deformation result through simulation based on the casting design and the three-dimensional model of the first cylinder head, and obtain a three-dimensional model of a second cylinder head based on the cylinder head deformation result;

[0033] The stereolithography apparatus is configured to manufacture a physical model of the three-dimensional model of the second cylinder head by stereolithography;

[0034] The test device is configured to test the physical model to obtain a verification result of the engine air passage.

[0035] In a fourth aspect, the present application provides a device. The device includes a memory and a processor. The memory is used to store instructions or codes, and the processor is used to execute the instructions or codes so that the device executes the test and verification method for the engine air passage according to any one of the foregoing first aspects.

[0036] In a fifth aspect, the present application provides a computer storage medium. The computer storage medium stores codes. When the codes are run, the device running the codes implements the test and verification method for the engine air passage according to any one of the foregoing first aspects.

[0037] The present application provides a test and verification method for an engine air passage. When executing the method, first obtain a three-dimensional model of a first cylinder head and a casting design, then obtain a cylinder head deformation result through simulation based on the casting design and the three-dimensional model of the first cylinder head, then obtain a three-dimensional model of a second cylinder head based on the cylinder head deformation result, and finally manufacture a physical model of the three-dimensional model of the second cylinder head by stereolithography; the physical model is used for engine air passage testing to realize the rapid manufacturing and experimental testing of the engine air passage through stereolithography technology. In this way, by obtaining the deformation result of the cylinder head through simulation software and the physical model of the deformed cylinder head manufactured by stereolithography, the casting deformation factor is brought forward and the rapid manufacturing and experimental testing of the engine air passage are realized, achieving the effect of quickly testing the performance index of the air passage on the premise of ensuring dimensional consistency. In this way, the development efficiency of the engine air passage can be improved and the development cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] To more clearly illustrate the technical solutions in the embodiments or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0039] Figure 1 It is a method flow chart of a method for testing and verifying an engine air passage provided by an embodiment of the present application;

[0040] Figure 2 It is a method flow chart of a possible implementation manner of step S101 provided by an embodiment of the present application;

[0041] Figure 3 It is a method flow chart of another method for testing and verifying an engine air passage provided by an embodiment of the present application;

[0042] Figure 4 It is a schematic diagram of a testing and verifying system for an engine air passage provided by an embodiment of the present application;

[0043] Figure 5 It is a schematic structural diagram of a testing and verifying device for an engine air passage provided by an embodiment of the present application. Detailed implementation manners

[0044] As described above, in the prior art, by using Computational Fluid Dynamics (CFD) simulation software, Six Sigma (6Sigma) tools, blue light three-dimensional scanning, and FEV air passage performance test benches, the key influencing factors affecting the stability of the air passage performance of the cylinder head are first obtained by using the simulation software, and then the air passage sand core model is quickly printed by 3D printing technology to make the air passage physical model. Furthermore, the three-dimensional point cloud model obtained by scanning the physical model through blue light three-dimensional scanning is compared with the original CAD model, so as to identify the sources of variation in the manufacturing process. However, through the above method, it is necessary to wait for the manufacturing of the cylinder head product, and its mold needs to be continuously modified, resulting in a long manufacturing cycle. On the other hand, the use of 3D printing technology can realize the printing of sand cores, but the technical advantages of 3D printing make the 3D printed sand cores different from the casting process of actual mass-produced products, resulting in differences between the final products and the CAD model. Therefore, long-cycle iteration, testing, and verification are still required.

[0045] It has been found through research that by using simulation software to obtain the deformation results of the cylinder head, and then using the solid model of the deformed cylinder head manufactured by stereolithography, the casting deformation factors are brought forward, and the rapid manufacturing and experimental testing of the engine air passage are realized, achieving the effect of rapidly testing the performance indicators of the air passage on the premise of ensuring dimensional consistency.

[0046] In view of this, the present application provides a method for testing and verifying an engine air passage. When implementing the method, first obtain the three-dimensional model of the first cylinder head and the casting design, then obtain the cylinder head deformation results through simulation based on the casting design and the three-dimensional model of the first cylinder head, then obtain the three-dimensional model of the second cylinder head based on the cylinder head deformation results, and finally manufacture the solid model of the three-dimensional model of the second cylinder head by stereolithography; the solid model is used for engine air passage testing to realize the rapid manufacturing and experimental testing of the engine air passage through stereolithography technology. In this way, by using simulation software to obtain the deformation results of the cylinder head and the solid model of the deformed cylinder head manufactured by stereolithography, the casting deformation factors are brought forward, and the rapid manufacturing and experimental testing of the engine air passage are realized, achieving the effect of rapidly testing the performance indicators of the air passage on the premise of ensuring dimensional consistency. Thus, the efficiency of engine air passage development can be improved and the development cost can be reduced.

[0047] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0048] See Figure 1 , Figure 1 which is a flowchart of a method for testing and verifying an engine air passage provided by an embodiment of the present application. In conjunction with Figure 1 shown, the method for testing and verifying an engine air passage provided by an embodiment of the present application may include:

[0049] S101: Obtain the three-dimensional model of the first cylinder head and the casting design.

[0050] In this embodiment, first obtain the three-dimensional model of the first cylinder head and the casting design. Among them, the air passage structure of the engine is integrated in the cylinder head, and the air passage of the engine is a key component of the engine, providing a passage for air to enter and exit the cylinder. The intake air passage is the passage for air to enter the engine body and lead to the cylinder. It not only supplies a certain flow of air to the engine, but also ensures the normal operation of the compressor and the combustion chamber.

[0051] When manufacturing an engine air passage, usually, the design of the three-dimensional model of the cylinder head is completed by using the engine air passage design model, that is, the first three-dimensional model of the cylinder head is obtained. Then, based on the three-dimensional model of the first cylinder head, casting design is carried out. The casting design can include two parts, including the sand core design of casting and the casting process. The air passage is formed by the sand core on the casting. The internal cavity of a cylinder head is composed of multiple different sand cores. Casting is a method of pouring liquid metal into a casting cavity adapted to the shape of the part and waiting for it to cool and solidify to obtain the part or blank. Cylinder heads are generally cast from high-quality gray iron or alloy iron. Aluminum alloy cylinder heads are mostly used for gasoline engines in cars. According to different designs, materials, and uses, the sand core design for casting cylinder heads is different, and the selected processes are also different.

[0052] S102: Obtain the cylinder head deformation result through simulation based on the casting design and the first three-dimensional model of the cylinder head.

[0053] In this embodiment, based on the first three-dimensional model of the cylinder head and the casting design obtained above, the cylinder head deformation result is obtained through simulation based on the casting design and the first three-dimensional model of the cylinder head. Specifically, in actual casting, it is necessary to first design the relevant process structure of the sand core, and then perform core making and assembly. There will be certain deviations in the assembly process; when actually pouring liquid metal, the molten metal has a large buoyancy on the sand core, which will have a certain impact on the position of the sand core; when the metal solidifies, the liquid metal shrinks, generating internal stress, which will also form a pressing force on the sand core, and tensile or compressive forces will also be formed at different positions of the metal itself. The above factors will cause a certain difference between the formed casting and the design model.

[0054] In recent years, with the rapid development of computer technology, simulation software for the casting process has emerged. The application of casting simulation technology is not limited to the simulation and analysis in the product R & D process, and the process simulation in the production and manufacturing link also plays a crucial role. In this embodiment, through the simulation software, based on the corresponding sand core model and relevant casting parameters, the casting process can be simulated, and the deformation result can be obtained by simulating the casting parameters and stress changes.

[0055] Optionally, in the embodiment of the present application, obtaining the cylinder head deformation result through simulation based on the casting design and the first three-dimensional model of the cylinder head specifically includes obtaining the cylinder head deformation result through finite element simulation and / or finite difference simulation and / or finite volume simulation based on the casting design and the first three-dimensional model of the cylinder head.

[0056] Specifically, the Finite Element Method (FEM) is a numerical method for solving heat, force, and electromagnetic problems of a continuum by regarding the continuum as a discretized collection of a number of finite-sized element bodies. Its basic idea is to discretize the continuous solution domain into a combination of a finite number of elements connected in a certain way. The finite element simulation system can perform simulation analysis on aspects such as technical index structure and fluid analysis. Its principle is to discretize the solution domain of the system into a grouping system of elements, and use the approximate field functions assumed in one element to piecewise describe all the unknown field functions to be solved in the solution domain. Similar functions are generally described by the derivatives of the unknown field functions and the numerical interpolation functions of each node in the element. Thus, a continuous problem with infinite degrees of freedom is transformed into a discrete problem with finite degrees of freedom.

[0057] The Finite Difference Method (FDM) was the earliest method adopted in computer numerical simulation. This method divides the solution domain into a difference grid and replaces the continuous solution domain with a finite number of grid nodes. The finite difference method uses methods such as Taylor series expansion to discretize the derivatives in the control equation by replacing them with the difference quotients of the function values at the grid nodes, thereby establishing an algebraic equation system with the values at the grid nodes as unknowns. This method is an approximate numerical solution method that directly transforms a differential problem into an algebraic problem, with intuitive mathematical concepts and simple expressions. Specifically, for finite difference schemes, from the perspective of the accuracy of the scheme, there are first-order schemes, second-order schemes, and high-order schemes. Considering the spatial form of the differences, they can be divided into central schemes and upwind schemes. Considering the influence of the time factor, the difference schemes can also be divided into explicit schemes, implicit schemes, explicit-implicit alternating schemes, etc. Currently, the common difference schemes are mainly combinations of the above several forms, and different combinations constitute different difference schemes. The finite difference method is mainly applicable to structured grids, and the grid step size is generally determined according to the actual terrain conditions and the Courant stability condition.

[0058] The Finite Volume Method, also known as the Control Volume Method, has the following basic idea: divide the computational domain into a series of non-overlapping control volumes, and ensure that there is a control volume around each grid point; integrate the differential equation to be solved for each control volume to obtain a set of discrete equations. The unknowns are the numerical values of the dependent variables at the grid points. To calculate the integral of the control volume, it is necessary to assume the variation law of the values between the grid points, that is, assume the distribution profile of the piecewise values. From the perspective of the selection method of the integration region, the finite volume method belongs to the sub-region method in the weighted residual method; from the perspective of the approximate method of the unknown solution, the finite volume method belongs to the discrete method using local approximation. In short, the sub-region method belongs to the basic method of the finite volume method. The discrete equations obtained by the finite volume method require the integral conservation of the dependent variables to be satisfied for any set of control volumes, and naturally also for the entire computational domain.

[0059] Optionally, when determining the deformation result of the cylinder head, first, the filling, solidification, and stress of the first cylinder head can be calculated based on the casting design through simulation, so as to obtain the deformation result of the cylinder head of the first cylinder head. Specifically, the process parameters can be obtained first, and then calculations can be performed according to the process parameters. Among them, the process parameters can include the core type, the type of casting process, and the specific parameters of the casting process. The specific parameters of the casting process can, for example, include relevant parameters such as the type of liquid for filling, the flow rate, and the temperature. After obtaining the process parameters, simulation can be performed based on the process parameters to obtain the stress data and deformation conditions of the cylinder head. In this embodiment, preferred simulation software can include professional casting simulation software such as MAGMASOFT, ProCAST, AnyCasting, Flow-3D, and Huazhu CAE.

[0060] In this embodiment, the deformation conditions during the casting process of the cylinder head casting are predicted based on the above finite element simulation method, so as to obtain the three-dimensional airway after being affected by the casting process deviation, which has the advantages of high speed and low cost compared with methods such as manufacturing actual castings, sectioning, and scanning.

[0061] S103: Obtain the three-dimensional model of the second cylinder head based on the deformation result of the cylinder head.

[0062] In this embodiment, the deformation result of the cylinder head is obtained through the above simulation, and the three-dimensional model of the second cylinder head, that is, the deformed cylinder head, is obtained based on the deformation result of the cylinder head.

[0063] S104: Manufacture a physical model of the three-dimensional model of the second cylinder head by stereolithography; the physical model is used for engine airway testing.

[0064] In this embodiment, since the three-dimensional model of the deformed cylinder head is obtained through the above simulation, the three-dimensional model of the second cylinder head is printed into a physical model by stereolithography. Specifically, the stereolithography technology SLA (StereoLithography) uses liquid photosensitive resin as the raw material, and a laser with a specific wavelength is focused on the surface of the photosensitive resin material to cure the selected area of the photosensitive resin material, making it solidify from point to line and from line to surface in sequence. In this way, layers are stacked to form a three-dimensional entity. SLA uses ultraviolet laser as the light source, and the laser spot scanning cross-section contour is precisely controlled by a rotating mirror. After one layer is cured, the next layer is cured, and in this way, layers are stacked to form a three-dimensional entity. The main advantages of this method are higher precision and better printing quality, because the precise movement and small size of the laser can achieve better details and resolution. Therefore, the workpiece scale accuracy prepared by SLA is high, and the completed physical model printing can be used for a series of performance tests of the engine airway.

[0065] Preferably, the above-mentioned stereolithography technology can also select printing technologies such as CLIP (Continuous Liquid Interface Production technology), LCD (Liquid-crystal display), and DLP (Digital Light Processing).

[0066] Among them, DLP (Digital Light Processing) uses an ultraviolet projector as the light source and works by controlling the projected light through a digital micromirror device (DMD). Each time it projects one layer and cures an entire layer at a time. Therefore, in terms of speed, DLP is faster than SLA. The printing accuracy of DLP will decrease as the projection area increases, so the printing size is limited by the resolution of the projector. The LCD (Liquid-crystal display) printing technology is also called DUP (Direct UV Printing). It illuminates the cross-section of 3D printing by using an LCD screen to cover the ultraviolet light source. By using LCD printing, a speed comparable to DLP can be obtained, and the device is lighter, smaller, and cheaper. CLIP (Continuous Liquid Interface Production technology) projects from the bottom to cure the photosensitive resin. The parts that do not need to be cured form a dead zone by controlling oxygen, inhibiting the photocuring reaction and maintaining a stable liquid region, thus ensuring the continuity of curing. CLIP is developed on the basis of the SLA technology and increases the speed of 3D printing by 100 times. Based on the above, users can select different printing technologies according to different needs, and print the deformed cylinder head model into a solid result for testing and verification.

[0067] Optionally, the molding material for manufacturing the solid model of the three-dimensional model of the second cylinder head by stereolithography in the embodiment of the present application is a transparent material, and visual observation can be carried out during the process of the air passage blowing test using tracer particles.

[0068] In this embodiment, the deformation results of the cylinder head and the solid model of the deformed cylinder head manufactured by stereolithography are obtained through simulation software, so that the casting deformation factors are brought forward and the rapid manufacturing and test of the engine air passage are realized, achieving the effect of quickly testing the performance indicators of the air passage on the premise of ensuring dimensional consistency. In this way, the efficiency of engine air passage development can be improved and the development cost can be reduced.

[0069] In the embodiment of the present application, the above Figure 1There are multiple possible implementation manners for the described step S101, which will be introduced separately below. It should be noted that the implementation manners given in the following introduction are only for exemplary illustration and do not represent all the implementation manners of the embodiments of the present application.

[0070] See Figure 2 , Figure 2 which is a flowchart of a method for obtaining a three-dimensional model and a casting design of a first cylinder head provided by an embodiment of the present application. With reference to Figure 2 as shown, the method for obtaining a three-dimensional model and a casting design of a first cylinder head provided by an embodiment of the present application may include:

[0071] S201: Construct a three-dimensional model of the first cylinder head model.

[0072] In this embodiment, the optimized design of the engine intake system can make the air flow in the cylinder move in a specific form to improve its combustion process. Therefore, the characteristics of the intake system have a very significant impact on the comprehensive performance of the engine. In order to enable the engine to meet the requirements of good power performance, economy and emission characteristics, the air passages in the cylinder head must be able to achieve a sufficiently high flow coefficient and appropriate tumble ratio and swirl ratio. By designing the air passage structure, a three-dimensional model of the cylinder head is obtained. It can be understood that the three-dimensional model can be designed by unit drawing design software such as CAD, and a three-dimensional model of the required cylinder head model is constructed according to user requirements.

[0073] S202: Based on the three-dimensional model of the first cylinder head model, perform core design and casting process design according to the actual casting process of the cylinder head.

[0074] In this embodiment, since the air passages in the actual casting process are formed by cores on the casting, the internal cavity of a cylinder head is composed of multiple different cores. The actual casting process can be divided into gravity casting, high-pressure casting, low-pressure casting, etc. Gravity casting refers to the process in which molten metal is poured into the mold under the action of the earth's gravity. Generalized gravity casting includes sand casting, permanent mold casting, investment casting, lost foam casting, etc. The molten metal is generally poured into the gate manually, and the mold cavity is filled, exhausted, cooled, and the mold is opened by relying on the self-weight of the molten metal to obtain the product. High-pressure casting is a casting method in which molten alloy liquid is poured into a pressure chamber, filled into the cavity of a steel mold at high speed, and the alloy liquid solidifies under pressure to form a casting. Low-pressure casting is to introduce dry compressed air into a sealed crucible (or sealed tank). Under the action of gas pressure, the molten metal enters the sprue and rises along the riser pipe, enters the mold cavity smoothly through the ingate, and the gas pressure on the liquid surface in the crucible is maintained until the casting is completely solidified. Then the gas pressure on the liquid surface is released, and the molten metal in the riser pipe that has not solidified flows back to the crucible. Then the mold is opened and the casting is taken out.

[0075] S203: Obtain the 3D model of the sand core through the above sand core design.

[0076] In this embodiment, the 3D model of the sand core is obtained through the above sand core design for simulation use. It can be understood that the above 3D model of the sand core includes not only its shape design but also specific parameters.

[0077] S204: Obtain the casting process parameters through the above casting process design.

[0078] In this embodiment, due to different casting processes, such as gravity casting, pouring, high-pressure casting, and low-pressure casting, etc., their corresponding casting parameters are also different. Therefore, the corresponding process parameters, such as pressure, flow rate, etc., are obtained for different casting processes.

[0079] In this embodiment, different sand core designs and their casting process parameters are obtained for simulation to obtain different simulation deformation results.

[0080] See Figure 3 , Figure 3 , which is the flowchart of another test and verification method for the engine air passage provided by the embodiment of the present application. As shown in combination with Figure 3 , a test and verification method for the engine air passage provided by the embodiment of the present application further includes:

[0081] S301: Process the physical model and assemble it onto the air passage blowing test bench.

[0082] In this embodiment, the physical model manufactured in any of the above embodiments of the present application is processed. It can be understood that the above manufactured physical model can be subjected to component assembly and machining, etc., to further obtain a complete or user-required structure, and assemble it onto the corresponding test device for testing, preferably such as an air passage blowing test bench, etc.

[0083] S302: Obtain the swirl ratio and flow coefficient of the air passage through testing.

[0084] In this embodiment, the swirl ratio and flow coefficient of the air passage are obtained through testing. Preferably, in this application, the PIV (Particle Image Velocimetry) technology can be used for fluid mechanics velocity measurement. Except for spreading tracer particles into the flow field, all measuring devices do not intervene in the flow field, and the PIV technology has high measurement accuracy. There are various classifications of the PIV velocity measurement method. Regardless of the form of PIV, its velocity measurement depends on the tracer particles scattered in the flow field. The PIV method for velocity measurement indirectly measures the transient velocity distribution of the flow field by measuring the displacement of the tracer particles within a known short time interval. If the tracer particles have sufficiently high flow followability, the movement of the tracer particles can truly reflect the movement state of the flow field. Therefore, the tracer particles are very important in the PIV velocity measurement method.

[0085] S303: Obtain the verification result of the engine air passage based on the swirl ratio and the flow coefficient.

[0086] In this embodiment, parameters such as the swirl ratio and flow coefficient of the air passage obtained above are compared with the design parameters to determine whether the air passage is qualified. According to the deviation between the test value and the design value, the casting process or the air passage model is adjusted, and finally an air passage and its structure that meet the design requirements and their corresponding casting process parameters are obtained.

[0087] The above introduces a test and verification method for an engine air passage provided by an embodiment of this application. Next, in combination with a specific application scenario, an exemplary description of the test and verification method for the engine air passage will be given.

[0088] See Figure 4 , Figure 4 which is a schematic diagram of a test and verification system for an engine air passage provided by an embodiment of this application. In combination with Figure 4 shown, a test and verification system for an engine air passage provided by an embodiment of this application includes: a computer 401, a stereolithography apparatus 402, and a test device 403. The computer 401 is respectively connected to the stereolithography apparatus 402 and the test device 403;

[0089] The computer 401 is configured to obtain the three-dimensional model of the first cylinder head and the casting design, obtain the cylinder head deformation result through simulation based on the casting design and the three-dimensional model of the first cylinder head, and obtain the three-dimensional model of the second cylinder head based on the cylinder head deformation result.

[0090] The stereolithography apparatus 402 is configured to manufacture a physical model of the three-dimensional model of the second cylinder head by stereolithography.

[0091] The test device 403 is configured to test the physical model to obtain the verification result of the engine air passage.

[0092] The above are some specific implementation manners of the method for testing and verifying the engine air passage provided by the embodiments of the present application. Based on this, the present application also provides a corresponding device. Next, the device provided by the embodiments of the present application will be introduced from the perspective of functional modularization.

[0093] Refer to Figure 5 The structural schematic diagram of a device 500 for testing and verifying an engine air passage as shown. The device 500 includes an acquisition module 501, a simulation module 502, a determination module 503, and a manufacturing module 504.

[0094] The acquisition module 501 is configured to acquire the three-dimensional model of the first cylinder head and the casting design.

[0095] The simulation module 502 is configured to obtain the cylinder head deformation result through simulation based on the casting design and the three-dimensional model of the first cylinder head.

[0096] The determination module 503 is configured to obtain the three-dimensional model of the second cylinder head based on the cylinder head deformation result.

[0097] The manufacturing module 504 is configured to manufacture a physical model of the three-dimensional model of the second cylinder head by stereolithography; the physical model is used for engine air passage testing.

[0098] The embodiments of the present application also provide a corresponding device and a computer storage medium for implementing the solutions provided by the embodiments of the present application.

[0099] Wherein, the device includes a memory and a processor. The memory is configured to store instructions or codes, and the processor is configured to execute the instructions or codes so that the device executes the method for testing and verifying the engine air passage according to any embodiment of the present application.

[0100] The computer storage medium stores codes. When the codes are run, the device running the codes implements the method for testing and verifying the engine air passage according to any embodiment of the present application.

[0101] In the embodiments of the present application, the "first", "second" (if any) in the names such as "first" and "second" are only used as name identifiers and do not represent the first and second in order.

[0102] As can be seen from the description of the above embodiments, those skilled in the art can clearly understand that all or part of the steps in the above-described method of the embodiments can be implemented by means of software plus a general-purpose hardware platform. Based on such an understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a storage medium, such as a read-only memory (ROM) / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network communication device such as a router) to execute the methods described in various embodiments or some parts of the embodiments of the present application.

[0103] Each embodiment in this specification is described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for the relevant parts, reference can be made to the partial description of the method embodiment. One can select some or all of the modules according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0104] The above description is only an exemplary embodiment of the present application and is not intended to limit the protection scope of the present application.

Claims

1. A method for testing and verifying an engine air passage, characterized in that, Including: Obtain the three-dimensional model and casting design of the first cylinder head; Based on the casting design and the three-dimensional model of the first cylinder head, obtain the cylinder head deformation result through simulation; Based on the cylinder head deformation result, obtain the three-dimensional model of the second cylinder head; Manufacture a physical model of the three-dimensional model of the second cylinder head by stereolithography; The physical model is used for engine airway testing; The obtaining of the three-dimensional model and casting design of the first cylinder head includes: Construct the three-dimensional model of the first cylinder head model; Based on the three-dimensional model of the first cylinder head model, conduct core design and casting process design according to the actual casting process of the cylinder head; Obtain the three-dimensional model of the core through the core design; Obtain the casting process parameters through the casting process design; The obtaining of the cylinder head deformation result through simulation based on the casting design and the three-dimensional model of the first cylinder head includes: Through simulation, conduct filling, solidification, and stress calculation on the first cylinder head based on the casting design; Based on the filling, solidification, and stress calculation of the first cylinder head, obtain the cylinder head deformation result of the first cylinder head.

2. The method according to claim 1, characterized in that, The obtaining of the cylinder head deformation result through simulation based on the casting design and the three-dimensional model of the first cylinder head includes: Obtain the cylinder head deformation result through finite element simulation and / or finite difference simulation and / or finite volume simulation based on the casting design and the three-dimensional model of the first cylinder head.

3. The method according to claim 1, characterized in that, The forming material for manufacturing the physical model of the three-dimensional model of the second cylinder head by stereolithography is a transparent material.

4. The method according to claim 1, characterized in that, The method further includes: Process the physical model and assemble it onto the airway blowing test bench; Obtain the swirl ratio and flow coefficient of the airway through testing; Based on the swirl ratio and the flow coefficient, obtain the verification result of the engine airway.

5. A test and verification device for an engine air passage, used to implement the test and verification method for an engine air passage according to claim 1, characterized in that, Including: An obtaining module, used to obtain the three-dimensional model and casting design of the first cylinder head; A simulation module, used to obtain the cylinder head deformation result through simulation based on the casting design and the three-dimensional model of the first cylinder head; A determination module, used to obtain the three-dimensional model of the second cylinder head based on the cylinder head deformation result; A manufacturing module, used to manufacture a physical model of the three-dimensional model of the second cylinder head by stereolithography; the physical model is used for engine airway testing.

6. A test and verification system for an engine air passage, used to implement the test and verification method for an engine air passage according to claim 1, characterized in that, The system includes: a computer, a stereolithography device, and a testing device; the computer is respectively connected to the stereolithography device and the testing device; The computer is used to obtain the three-dimensional model and casting design of the first cylinder head, obtain the cylinder head deformation result through simulation based on the casting design and the three-dimensional model of the first cylinder head, and obtain the three-dimensional model of the second cylinder head based on the cylinder head deformation result; The stereolithography device is used to manufacture a physical model of the three-dimensional model of the second cylinder head by stereolithography; The testing device is used to test the physical model to obtain the verification result of the engine airway.

7. An electronic device, characterized in that, The device includes a memory and a processor, the memory is used to store instructions or codes, and the processor is used to execute the instructions or codes so that the device executes the testing and verification method of the engine airway according to any one of claims 1 to 4.

8. A computer storage medium, characterized in that, The computer storage medium stores code, and when the code is run, the device running the code implements the method for testing and verifying the engine air passage according to any one of claims 1-4.

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