A closed flow channel machining control method for a tubular diffuser

Abstract

The present invention provides a closed flow channel machining control method for a tubular diffuser, the method comprising the following steps: S1: using CFD software to establish an initial disc flow channel geometry simulation model according to the curvature and length of the disc flow channel; S2: simulating the influence of different parameter configuration combinations of an inlet hole group and an outlet hole group on the performance of the tubular diffuser through the disc flow channel geometry simulation model, and determining the parameter configuration combination that optimizes the performance of the tubular diffuser; S3: importing the determined parameter configuration combination of the inlet hole and the outlet hole that optimizes the performance of the tubular diffuser into a drilling execution control system, and calculating the relative position and interval of the next pair of hole groups after drilling a pair of hole groups; S4: before drilling the next hole, calculating in real time the offset of the drilling parameters between the inlet hole group and the outlet hole group after drilling a pair of holes, and correcting it to the set drilling parameters, and fine-tuning it through a numerical control machine tool, and so on, completing the drilling of the hole groups in sequence.

Description

Technical Field

[0001] The invention relates to the technical field of tubular diffuser processing, and in particular to a closed flow channel processing control method of a tubular diffuser. Background Art

[0002] The closed flow channel of a tubular diffuser is a specific fluid mechanical component, which is widely used in aerospace, automobile engines and other fluid power systems. Its main function is to convert the kinetic energy of the fluid into pressure energy, and it plays an important role in aerodynamic design and performance optimization.

[0003] Among them, the corresponding position relationship between the inlet hole group and the outlet hole group has an important influence on the performance of the tubular diffuser, which is mainly reflected in the fluid dynamic characteristics, pressure distribution, flow stability and overall efficiency. The following is a specific impact analysis: The position relationship between the inlet hole group and the outlet hole group directly determines the flow path of the fluid in the diffuser. If the position of the inlet hole group is unreasonable, it may cause turbulence, separation or uneven flow of the fluid when entering the diffuser, affecting the smoothness of the fluid passing through the diffuser. The layout of the hole group will affect the velocity distribution of the fluid. A good design can ensure uniform flow of the fluid and improve the working efficiency of the diffuser. The distance and arrangement between the inlet hole group and the outlet hole group will affect the pressure loss of the fluid. If the design is improper, the fluid may generate greater friction resistance when passing through narrow areas at each stage, thereby increasing the overall pressure loss. The relative position between the inlet and outlet hole groups affects the flow pattern of the fluid, which in turn affects the aerodynamic stability. For example, if the hole groups are too close, flow interference may occur, resulting in reduced overall system performance. Summary of the invention

[0004] The object of the present invention is to provide a closed flow passage machining control method for a tubular diffuser to solve the problems raised in the above background technology.

[0005] The present invention is achieved through the following technical solutions:

[0006] A closed flow channel machining control method for a tubular diffuser, the method comprising the following steps:

[0007] S1: Based on the curvature and length of the disk flow channel, the initial disk flow channel geometry simulation model is established using CFD software;

[0008] S2: setting boundary conditions, fluid characteristics and different parameter configurations of the hole group, simulating the influence of different parameter configuration combinations of the inlet hole group and the outlet hole group on the performance of the tubular diffuser through the disk flow channel geometry simulation model, and determining the parameter configuration combination of the inlet hole group and the outlet hole group that optimizes the performance of the tubular diffuser through comparative analysis of multiple groups of simulation results;

[0009] S3: importing the determined parameter combination of the air inlet and the air outlet that optimizes the performance of the tubular diffuser into the drilling execution control system, drilling each air inlet and each air outlet in pairs, and after completing the drilling of a pair of hole groups, calculating the relative position and interval of the next pair of hole groups according to the curvature and length of the flow channel;

[0010] S4: Before drilling the next hole, the offset of the drilling parameters between the air inlet hole group and the air outlet hole group after completing a pair of drilling is calculated in real time, and corrected to the set drilling parameters in real time, and fine-tuned by the CNC machine tool, and drilling is performed according to the calculated and corrected drilling parameters, and so on, to complete the drilling of the hole groups in sequence.

[0011] Specifically, the step S2 specifically includes: selecting boundary conditions according to the flow pattern, and selecting appropriate boundary conditions based on the flow conditions:

[0012] If the flow is steady, select constant velocity inlet or constant pressure outlet as the boundary condition;

[0013] When the flow is transient, wave boundary conditions are used to simulate pulsating flow inlets.

[0014] Specifically, the different configurations of the hole groups in step S2 include different corresponding positional relationships and intervals between the air inlet hole group and the air outlet hole group, and opening inclination angles of the air inlet hole group and the air outlet hole group, wherein the air inlet hole group includes multiple air inlet holes, and the air outlet hole group includes multiple air outlet holes.

[0015] Specifically, the simulation in step S2 of the effects on the performance of the tubular diffuser under different parameter configuration combinations of the inlet hole group and the outlet hole group includes:

[0016] Calculate the velocity distribution at the inlet and outlet:

[0017]

[0018] Among them, V(x,y) represents, Q represents flow rate, and A represents flow channel cross-sectional area;

[0019] Calculate the pressure distribution in the flow channel:

[0020]

[0021] Among them, ΔP represents pressure loss, f represents friction factor, L represents flow channel length, D represents flow channel diameter, and ρ represents fluid density;

[0022] Calculate flow uniformity:

[0023]

[0024] Where σ represents the standard deviation of the flow rate, N represents the number of sampling points, V i represents the flow velocity at position i, Indicates the average flow rate.

[0025] Specifically, in step S2, by comparing and analyzing multiple groups of simulation results, according to the non-dominated sorting genetic algorithm, a parameter configuration combination of the air inlet and the air outlet that optimizes the performance of the tubular diffuser is determined, which is specifically as follows:

[0026] Set the objective function to maximize flow velocity, minimize pressure loss, and maximize flow uniformity;

[0027] Using the data obtained from the CFD simulation, an initial population is established, in which each individual corresponds to a combination of inlet and outlet parameter configurations;

[0028] The objective function value of each individual is calculated to evaluate its fitness, and excellent individuals are screened out by calculating the non-dominated ranking and crowding distance. The optimal configuration combination of inlet and outlet parameters is obtained with the priority of maximizing flow rate and minimizing pressure loss.

[0029] Specifically, in step S3, after completing the drilling of a pair of hole groups, the process of calculating the relative position and distance of the next pair of hole groups to be drilled according to the curvature and length of the flow channel is as follows:

[0030] After completing the drilling of a pair of holes, information on the location of the current hole, the curvature radius of the known flow channel, the length, and the direction of the curve is collected;

[0031] According to the curvature and length, calculate the relative position of the next pair of holes. Assuming the coordinates of the current hole group are (x0, y0), the position of the new hole group is:

[0032] Δx=Δd·cosθ

[0033] Δy=Δd·sinθ

[0034] (x1,y1)=(x0+Δx,y0+Δy)

[0035] Among them, Δd represents the set interval, θ is the angle in the tangent direction, and (x1, y1) represents the position coordinates of the new hole group.

[0036] Specifically, when an offset is detected in step S4, the current measured value is compared with the set drilling parameters to obtain the offset, and the offset is used as an input parameter of the tool position in the subsequent adjustment process. Correction and fine-tuning are performed through the CNC machine tool. When the tool reaches the new corrected position, the re-drilling process is started.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The present invention provides a closed flow channel machining control method for a tubular diffuser, which ensures that each step in the drilling process meets the design standards through real-time adjustment, reduces deviations caused by equipment errors or operational errors, and improves machining accuracy. By analyzing the effects of different parameter configuration combinations on diffuser performance through CFD simulation, the optimal design solution can be effectively identified to ensure that the manufactured tubular diffuser has superior fluid performance in practical applications. This method enables data feedback and real-time adjustment throughout the entire machining process, reducing the time and cost of re-machining and improving production efficiency; comprehensive parameter evaluation and fine-tuning processes ensure the quality of the final product and enhance the reliability and effectiveness of the tubular diffuser in practical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only preferred embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 A flowchart of the steps of a closed flow channel machining control method for a tubular diffuser provided by the present invention. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the present invention more obvious, the exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described herein. Based on the embodiments of the present invention described in the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the protection scope of the present invention.

[0042] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0043] It should be understood that the present invention can be implemented in different forms and should not be interpreted as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to make the disclosure thorough and complete and to fully convey the scope of the present invention to those skilled in the art.

[0044] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present invention. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0045] In order to fully understand the present invention, a detailed structure will be proposed in the following description to illustrate the technical solution proposed by the present invention. The optional embodiments of the present invention are described in detail as follows, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0046] See also Figure 1 , a closed flow channel machining control method for a tubular diffuser, the method comprising the following steps:

[0047] S1: Based on the curvature and length of the disk flow channel, the initial disk flow channel geometry simulation model is established using CFD software;

[0048] S2: setting boundary conditions, fluid characteristics and different parameter configurations of the hole group, simulating the influence of different parameter configuration combinations of the inlet hole group and the outlet hole group on the performance of the tubular diffuser through the disk flow channel geometry simulation model, and determining the parameter configuration combination of the inlet hole group and the outlet hole group that optimizes the performance of the tubular diffuser through comparative analysis of multiple groups of simulation results;

[0049] S3: importing the determined parameter combination of the air inlet and the air outlet that optimizes the performance of the tubular diffuser into the drilling execution control system, drilling each air inlet and each air outlet in pairs, and after completing the drilling of a pair of hole groups, calculating the relative position and interval of the next pair of hole groups according to the curvature and length of the flow channel;

[0050] S4: Before drilling the next hole, the offset of the drilling parameters between the air inlet hole group and the air outlet hole group after completing a pair of drilling is calculated in real time, and corrected to the set drilling parameters in real time, and fine-tuned by the CNC machine tool, and drilling is performed according to the calculated and corrected drilling parameters, and so on, to complete the drilling of the hole groups in sequence.

[0051] Exemplarily, the present invention provides a closed flow channel processing control method for a tubular diffuser, which establishes an initial disk flow channel geometry simulation model through step S1 to analyze the flow characteristics of the fluid under different inlet and outlet configurations, providing a basis for performance optimization. Step S2 analyzes the impact of different hole group configurations on diffuser performance through simulation, and selects the optimal parameter combination. This process includes multiple data simulations, and the generated data is used to evaluate the key performance indicators of flow rate, pressure loss and flow uniformity to ensure that the final selected configuration can significantly improve the performance of the diffuser. Step S3 is used to optimize the geometric characteristics of the flow channel according to the drilling plan of each pair of hole groups. This step ensures that the relative position and distance of the inlet and outlet holes are consistent with the design requirements during the drilling process, and the deviation is calculated and corrected through step S4 to ensure drilling accuracy. The drilling accuracy is monitored in real time and fine-tuned to ensure that all drilling positions meet the design standards, avoid manufacturing defects, and ensure that each step can meet the preset accuracy and quality standards.

[0052] Specifically, the step S2 specifically includes: selecting boundary conditions according to the flow pattern, and selecting appropriate boundary conditions based on the flow conditions:

[0053] If the flow is steady, select constant velocity inlet or constant pressure outlet as the boundary condition;

[0054] When the flow is transient, wave boundary conditions are used to simulate pulsating flow inlets.

[0055] Specifically, the different configurations of the hole groups in step S2 include different corresponding positional relationships and intervals between the air inlet hole group and the air outlet hole group, and opening inclination angles of the air inlet hole group and the air outlet hole group, wherein the air inlet hole group includes multiple air inlet holes, and the air outlet hole group includes multiple air outlet holes.

[0056] Specifically, the simulation in step S2 of the effects on the performance of the tubular diffuser under different parameter configuration combinations of the inlet hole group and the outlet hole group includes:

[0057] Calculate the velocity distribution at the inlet and outlet:

[0058]

[0059] Among them, V(x,y) represents, Q represents flow rate, and A represents flow channel cross-sectional area;

[0060] Calculate the pressure distribution in the flow channel:

[0061]

[0062] Among them, ΔP represents pressure loss, f represents friction factor, L represents flow channel length, D represents flow channel diameter, and ρ represents fluid density;

[0063] Calculate flow uniformity:

[0064]

[0065] Where σ represents the standard deviation of the flow rate, N represents the number of sampling points, V i represents the flow velocity at position i, Indicates the average flow rate.

[0066] Exemplarily, some parameter configuration combinations of the different air inlet and air outlet holes are shown in Table 1, and their effects on the performance of the tubular diffuser are shown in Table 2:

[0067] Table 1 Some parameter configuration combinations

[0068]

[0069] Table 2: Performance of some parameter configuration combinations

[0070]

[0071]

[0072] Specifically, in step S2, by comparing and analyzing multiple groups of simulation results, according to the non-dominated sorting genetic algorithm, a parameter configuration combination of the air inlet and the air outlet that optimizes the performance of the tubular diffuser is determined, which is specifically as follows:

[0073] The objective functions are set to maximize flow velocity, minimize pressure loss, and maximize flow uniformity;

[0074] Using the data obtained from the CFD simulation, an initial population is established, in which each individual corresponds to a combination of inlet and outlet parameter configurations;

[0075] The objective function value of each individual is calculated to evaluate its fitness, and excellent individuals are screened out by calculating the non-dominated ranking and crowding distance. The optimal configuration combination of inlet and outlet parameters is obtained with the priority of maximizing flow rate and minimizing pressure loss.

[0076] For example, flow velocity maximization: it is hoped that the fluid flows at the highest possible speed in the flow channel, thereby improving the efficiency of the diffuser. Pressure loss minimization: reduce the energy loss of the fluid when it flows in the flow channel to maintain a more stable flow state. Highest flow uniformity: ensure that the flow is evenly distributed on the cross section, reduce local vortices and unevenness, and improve flow efficiency. All individuals are non-dominated sorted and stratified to obtain the non-dominated level of each individual. Among individuals with the same non-dominated level, their crowding distance is calculated. The crowding distance is used to measure the distribution of each individual in the target space, promote the diversity of solutions, and prevent the algorithm from falling into the local optimal solution. Combining the objective function value and the crowding distance, excellent individuals with high fitness and wide distribution are screened out, and then the optimal inlet and outlet parameter configuration combination is obtained with priority given to maximizing flow velocity and minimizing pressure loss.

[0077] Specifically, in step S3, after completing the drilling of a pair of hole groups, the process of calculating the relative position and distance of the next pair of hole groups to be drilled according to the curvature and length of the flow channel is as follows:

[0078] After completing the drilling of a pair of hole groups, information on the location of the current hole, the curvature radius of the known flow channel, the length, and the direction of the curve is collected;

[0079] According to the curvature and length, calculate the relative position of the next pair of hole groups. Assuming the coordinates of the current hole group are (x0, y0), the position of the new hole group is:

[0080] Δx=Δd·cosθ

[0081] Δy=Δd·sinθ

[0082] (x1,y1)=(x0+Δx,y0+Δy)

[0083] Among them, Δd represents the set interval, θ is the angle in the tangent direction, and (x1, y1) represents the position coordinates of the new hole group.

[0084] Specifically, when an offset is detected in step S4, the current measured value is compared with the set drilling parameters to obtain the offset, and the offset is used as an input parameter of the tool position in the subsequent adjustment process. Correction and fine-tuning are performed through the CNC machine tool. When the tool reaches the new corrected position, the re-drilling process is started.

[0085] Exemplarily, by calculating the position of a new hole group each time a pair of hole groups is drilled, the position of each hole group during drilling is ensured, thereby ensuring the performance of the tubular diffuser.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A closed flow channel machining control method for a tubular diffuser, characterized in that: The method comprises the following steps: S1: Based on the curvature and length of the disk flow channel, the initial disk flow channel geometry simulation model is established using CFD software; S2: setting boundary conditions, fluid characteristics and different parameter configurations of the hole group, simulating the influence of different parameter configuration combinations of the inlet hole group and the outlet hole group on the performance of the tubular diffuser through the disk flow channel geometry simulation model, and determining the parameter configuration combination of the inlet hole group and the outlet hole group that optimizes the performance of the tubular diffuser through comparative analysis of multiple groups of simulation results; S3: importing the determined parameter combination of the air inlet and the air outlet that optimizes the performance of the tubular diffuser into the drilling execution control system, drilling each air inlet and each air outlet in pairs, and after completing the drilling of a pair of hole groups, calculating the relative position and interval of the next pair of hole groups according to the curvature and length of the flow channel; S4: Before drilling the next hole, the offset of the drilling parameters between the air inlet hole group and the air outlet hole group after completing a pair of drilling is calculated in real time, and corrected to the set drilling parameters in real time, and fine-tuned by the CNC machine tool, and drilling is performed according to the calculated and corrected drilling parameters, and so on, to complete the drilling of the hole groups in sequence.

2. The closed flow channel machining control method of a tubular diffuser according to claim 1, characterized in that: The step S2 specifically includes: selecting boundary conditions according to the flow pattern, and selecting appropriate boundary conditions based on the flow conditions: If the flow is steady, select constant velocity inlet or constant pressure outlet as the boundary condition; When the flow is transient, wave boundary conditions are used to simulate pulsating flow inlets.

3. The closed flow channel machining control method of a tubular diffuser according to claim 2, characterized in that: The different configurations of the hole groups in step S2 include different corresponding positional relationships and intervals between the air inlet hole group and the air outlet hole group, and opening inclination angles of the air inlet hole group and the air outlet hole group, wherein the air inlet hole group includes multiple air inlet holes, and the air outlet hole group includes multiple air outlet holes.

4. The closed flow channel machining control method of a tubular diffuser according to claim 3, characterized in that: The effects of simulating different parameter configuration combinations of the inlet hole group and the outlet hole group on the performance of the tubular diffuser in step S2 include: Calculate the velocity distribution at the inlet and outlet: Among them, V(x,y) represents, Q represents flow rate, and A represents flow channel cross-sectional area; Calculate the pressure distribution in the flow channel: Among them, ΔP represents pressure loss, f represents friction factor, L represents flow channel length, D represents flow channel diameter, and ρ represents fluid density; Calculate flow uniformity: Where σ represents the standard deviation of the flow rate, N represents the number of sampling points, V i represents the flow velocity at position i, Indicates the average flow velocity.

5. The closed flow channel machining control method of a tubular diffuser according to claim 4, characterized in that: In step S2, by comparing and analyzing multiple groups of simulation results, a parameter configuration combination of the air inlet and the air outlet that optimizes the performance of the tubular diffuser is determined according to a non-dominated sorting genetic algorithm, as follows: Set the objective function to maximize flow velocity, minimize pressure loss, and maximize flow uniformity; Using the data obtained from the CFD simulation, an initial population is established, in which each individual corresponds to a combination of inlet and outlet parameter configurations; The objective function value of each individual is calculated to evaluate its fitness, and excellent individuals are screened out by calculating the non-dominated ranking and crowding distance. The optimal configuration combination of inlet and outlet parameters is obtained with the priority of maximizing flow rate and minimizing pressure loss.

6. The closed flow channel machining control method of a tubular diffuser according to claim 5, characterized in that: After completing the drilling of a pair of hole groups in step S3, the process of calculating the relative position and distance of the next pair of hole groups to be drilled according to the curvature and length of the flow channel is as follows: After completing the drilling of a pair of hole groups, information on the location of the current hole, the curvature radius of the known flow channel, the length, and the direction of the curve is collected; According to the curvature and length, calculate the relative position of the next pair of hole groups. Assuming the coordinates of the current hole group are (x0, y0), the position of the new hole group is: Δx=Δd·cosθ Δy=Δd·sinθ (x1,y1)=(x+Δx,y0+Δy) Among them, Δd represents the set interval, θ is the angle in the tangent direction, and (x1, y1) represents the position coordinates of the new hole group.

7. The closed flow channel machining control method of a tubular diffuser according to claim 6, characterized in that: When an offset is detected in step S4, the current measured value is compared with the set drilling parameter to obtain the offset, and the offset is used as an input parameter of the tool position in the subsequent adjustment process. Correction and fine-tuning are performed through the CNC machine tool. When the tool reaches the new corrected position, the re-drilling process is started.

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