CN114491880B - Parameterized rapid three-dimensional modeling and reduced order analysis method for water-cooled pipeline with bent pipe - Google Patents
Parameterized rapid three-dimensional modeling and reduced order analysis method for water-cooled pipeline with bent pipe Download PDFInfo
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Abstract
The invention discloses a parameterized rapid three-dimensional modeling and reduced-order analysis method for a water-cooling pipeline with an elbow, and relates to the field of parameter analysis of water-cooling pipelines. According to the invention, the research on the influence of the flow resistance of the water-cooling pipeline with the bent pipe with different structures is changed into the research on the influence of Angle (beta) and relative curvature radius (R/D 0) of different bent pipe angles on the flow resistance; then carrying out mathematical modeling on the water-cooling pipelines with different elbow angles and relative curvature radiuses; then, based on a pipeline structure, a finite volume model is built, and finite element simulation analysis is carried out; and finally, extracting a response curve of fluid flow-pressure drop in the pipeline, generating a ROM reduced-order model, and realizing quick calculation of pressure drop under different working conditions. The invention solves the problems of long three-dimensional modeling time and increase of mechanical labor, and improves the simulation modeling efficiency; for fluid performance simulation analysis of the same structural pipeline under different working conditions, a ROM reduced order model is utilized to realize quick calculation of pressure drop, and simulation analysis time under different working conditions is reduced.
Description
Technical Field
The invention relates to the field of parameter analysis of water-cooling pipelines, in particular to a parameterized rapid three-dimensional modeling and reduced-order analysis method for a water-cooling pipeline with an elbow.
Background
With the trend of high power, miniaturization and light weight of traction converters for railways, the volume is continuously reduced, the power level and the heat flux density are continuously improved, and therefore the heat dissipation problem of power electronic devices is more prominent. If the temperature is excessively increased, the power electronic device is permanently damaged, so that the traction converter stops working, and the design performance of the cooling system of the converter directly affects the stable and safe operation of the whole vehicle. The liquid cooling technology can lead the heat dissipation to be uniform, has small temperature gradient, is suitable for occasions with concentrated heat flux density, is a cooling mode with higher heat dissipation efficiency, and adopts a water cooling technology in most domestic railway high-power converters.
With the progress of science and technology, the properties and the motion law of the fluid are continuously studied, but the motion of the fluid has complexity and measurement difficulty, and physical models and experiments have limitations. With the development of computer technology, CFD (computational fluid dynamics) technology is adopted to perform numerical simulation, so that specific information of a relevant flow field can be given more simply, conveniently, rapidly and intuitively, prototype tests are greatly reduced, scientific research and development periods are shortened, and research expenses are saved.
In the prior art, a traction converter water cooling system consists of an expansion tank, a water pump, a heat exchanger, a connecting pipeline, a semiconductor device, a water cooling substrate of the semiconductor device and the like, and is specifically shown in fig. 1. As can be seen, the plurality of power module water cooled base plates of the traction converter are typically connected in parallel, and the economical efficiency and operational reliability of operation of the traction converter are greatly dependent on the uniformity of fluid distribution and the pressure drop of the pipeline. The pressure drop of the whole pipeline can be influenced due to different pipe diameters and different pipeline structures and different pipeline flow resistances. The current technical scheme is that three-dimensional simulation modeling is carried out by adopting three-dimensional graphics drawing software Preo/Creo or SCDM under Ansys WorkBench according to the three-dimensional structure of an actual pipeline. For pipelines of different sizes and structures, drawing software is required to redraw the three-dimensional model. For pipeline flow field simulation under different input conditions, simulation analysis is needed again.
The above-described technique has the following disadvantages: 1) The pipeline simulation modeling workload of different pipe diameters, different pipe bending angles, different curvature radiuses and different lengths is large, and the simulation modeling is carried out again each time, so that the mechanical labor is increased; 2) For fluid performance analysis of the same structure pipeline under different working conditions, multiple simulation calculation needs to be carried out, the time consumption is high, and the simulation efficiency is low. Therefore, in view of the above problems, there is a need to construct a generalized rapid modeling and analysis method.
Disclosure of Invention
The invention provides an improved and universal parameterized rapid three-dimensional modeling and reduced-order analysis method for a water-cooling pipeline with a bent pipe, which aims to solve the problems of multiple times of re-modeling and time-consuming calculation of simulation modeling analysis caused by different angles and different curvature radiuses of the bent pipe of a water-cooling pipeline of the conventional converter.
The invention is realized by the following technical scheme: the parameterized rapid three-dimensional modeling and reduced order analysis method for the water-cooled pipeline with the bent pipe is characterized in that the bent pipe angle and the relative curvature radius of the pipe fitting are different in the structure of the water-cooled pipeline with the bent pipe in the converter cabinet cooling system, and the structure characteristics of the pipelines with different bent pipe angles and relative curvature radii are as follows: y=f (Φ (i), Φ (j)); in the expression, phi (i) is a functional relation of a bent pipe water-cooling pipeline path, phi (j) is a sweep algorithm for converting a pipeline model from one dimension to three dimension, and the construction and reduced order analysis method of the bent pipe water-cooling pipeline three-dimensional model comprises the following steps:
(1) Establishing a path model of a bent pipe water-cooling pipeline, and taking a bent pipe angle, a bent pipe radius, a horizontal Length of the pipeline along an X-axis direction and a vertical Length of the pipeline along a Y-axis direction of the bent pipe water-cooling pipeline as beta, R, length _H and Length_V respectively, wherein a coordinate system is defined firstly, an X-axis positive direction of an abscissa is directed to the right, and an Y-axis positive direction of an ordinate is directed to the upper;
The four points of the elbow path model from the starting point to the end point are O (x 0,y0)、A(x1,y1)、B(x2,y2) and C (x 3,y3) points in sequence, the four points take the starting point position O point (x 0,y0) of the pipeline as a reference, namely the O point is the starting point coordinate of a coordinate system, the A point, the B point and the C point are respectively defined, and the functional relation between the coordinates of the O, A, B and the C point and beta, R, length _H and length_V is as follows: phi (i) =f (β, R, length_h, length_v);
the coordinate relation between A, B and point C in the elbow water-cooling pipeline path model is as follows:
x1=x0+( y0+Length_V-R+ R*cosβ)/tanβ,y1= y0+Length_V-R+ R*cosβ;
x2= x1+R*sinβ= x0+( y0+Length_V-R+ R*cosβ)/tanβ+R*sinβ,y2=y0+Length_V;
x3= x0+Length_H,y3= y2=y0+Length_V；
(2) Establishing a pipeline three-dimensional structure with different elbow angles and different relative curvature radiuses, taking the pipeline diameter as D 0, constructing a pipeline shape with a circular section, and utilizing a general sweep algorithm phi (j) to sweep the pipeline section along the elbow pipeline path model created in the step (1), so that the model is converted into three dimensions from one dimension, and generating a pipe fitting with different elbow angles beta and different relative curvature radiuses R/D 0;
(3) And (3) performing quick comparison simulation analysis on pipeline performances under different input conditions by using a reduced order analysis method: according to the first two steps, the rapid construction of the three-dimensional model of the water-cooling pipeline with the bent pipe with different bent pipe angles and relative curvature radiuses can be completed; performing performance research analysis on pipelines with different structures, namely performing performance comparison simulation analysis on pipeline three-dimensional models with different bent pipe angles and relative curvature radiuses under different input conditions; for the repeated CFD basic model calculation, a three-dimensional and one-dimensional coupling mode is adopted, a finite volume model of the CFD basic model is built based on a water cooling pipeline of a converter cooling system for finite element simulation analysis, a response curve about fluid flow-pressure drop is extracted, and a general ROM (read only memory) order reduction technology is adopted to generate a ROM order reduction model; the numerical value of the input flow is changed, and the three-dimensional simulation analysis is not needed to be carried out again, so that the pipeline pressure drop result can be obtained rapidly; that is, the whole pipeline is processed into a system by using a ROM model, a three-dimensional pipeline structure is converted into a one-dimensional model, the input is flow and the output is pressure drop.
According to the invention, the research on the influence of the flow resistance of the water-cooling pipeline with the bent pipe with different structures is changed into the research on the influence of Angle (beta) and relative curvature radius (R/D 0) of different bent pipe angles on the flow resistance; then carrying out mathematical modeling on the water-cooling pipelines with different elbow angles and relative curvature radiuses; then, based on a pipeline structure, a finite volume model is built, and finite element simulation analysis is carried out; and finally, extracting a response curve of fluid flow-pressure drop in the pipeline, generating a ROM reduced-order model, and realizing quick calculation of pressure drop under different working conditions.
Compared with the prior art, the invention has the following beneficial effects: the parameterized rapid three-dimensional modeling and reduced-order analysis method for the water-cooling pipeline with the bent pipe provided by the invention aims at three-dimensional simulation modeling of the water-cooling pipeline of the high-power converter, particularly simulation modeling of a bent pipe part, adopts the parameterized modeling method to realize rapid three-dimensional modeling of bent pipes with different structures and sizes, is convenient for performance comparison analysis of pipelines with different structures, and selects an optimal scheme; and for simulation analysis of the same pipeline under different input conditions, a ROM reduced order model is adopted to quickly obtain a corresponding pipeline pressure drop result. The problems of long three-dimensional modeling time and increase of mechanical labor are solved, and simulation modeling efficiency is improved; when the related parameters of the pipeline are changed, three-dimensional modeling can be automatically completed only by inputting key parameter data; for fluid performance simulation analysis of the same structure pipeline under different working conditions, a ROM reduced order model is utilized to realize quick calculation of pressure drop, and simulation analysis time under different working conditions is reduced; the development progress of the product is quickened.
Drawings
Fig. 1 is a schematic diagram of a water cooling system of a traction converter in the background art.
Fig. 2 and 3 are schematic diagrams of parameters of different bend angles and relative radii of curvature.
FIG. 4 is a schematic diagram of modeling parameters of a water cooled pipeline with a bent pipe.
Fig. 5, 6 and 7 are schematic diagrams of pipe fittings with different elbow angles β generated by rapid modeling.
Fig. 8 and 9 are schematic tube diagrams of different relative radii of curvature generated by rapid modeling, with the comparative parameters being different radii of curvature R.
Fig. 10 and 11 are schematic diagrams of pipe elements with different relative radii of curvature generated by rapid modeling, and the comparative parameters are different pipe diameters D 0.
Detailed Description
The invention is further illustrated below with reference to specific examples.
The parameterized rapid three-dimensional modeling and reduced order analysis method for the water-cooling pipeline with the bent pipe is shown in fig. 2 and 3, the structure of the water-cooling pipeline with the bent pipe in the converter cooling system is characterized in that the angle of the bent pipe and the relative curvature radius of the pipe are different, and the structure of the pipeline with the angle of the bent pipe and the relative curvature radius is characterized in that: y=f (Φ (i), Φ (j)); in the expression, phi (i) is a functional relation of a bent pipe water-cooling pipeline path, phi (j) is a sweep algorithm for converting a pipeline model from one dimension to three dimension, and the construction and reduced order analysis method of the bent pipe water-cooling pipeline three-dimensional model comprises the following steps:
(1) As shown in fig. 4, a path model of the elbow water-cooling pipeline is established, and a coordinate system is defined, wherein the elbow angle, the elbow radius, the horizontal Length of the pipeline along the X-axis direction and the vertical Length of the pipeline along the Y-axis direction of the elbow water-cooling pipeline are respectively beta, R, length _H and Length_V, the positive direction of the X-axis of the abscissa is towards the right, and the positive direction of the Y-axis of the ordinate is towards the upper;
The four points of the elbow path model from the starting point to the end point are O (x 0,y0)、A(x1,y1)、B(x2,y2) and C (x 3,y3) points in sequence, the four points take the starting point position O point (x 0,y0) of the pipeline as a reference, namely the O point is the starting point coordinate of a coordinate system, the A point, the B point and the C point are respectively defined, and the functional relation between the coordinates of the O, A, B and the C point and beta, R, length _H and length_V is as follows: phi (i) =f (β, R, length_h, length_v);
the coordinate relation between A, B and point C in the elbow water-cooling pipeline path model is as follows:
x1=x0+( y0+Length_V-R+ R*cosβ)/tanβ,y1= y0+Length_V-R+ R*cosβ;
x2= x1+R*sinβ= x0+( y0+Length_V-R+ R*cosβ)/tanβ+R*sinβ,y2=y0+Length_V;
x3= x0+Length_H,y3= y2=y0+Length_V；
(2) 5-11, establishing a pipeline three-dimensional structure with different elbow angles and different relative curvature radiuses, taking the pipeline diameter as D 0, constructing a pipeline shape with a circular section, and sweeping the pipeline section along the elbow pipeline path model created in the step (1) by utilizing a general sweeping algorithm phi (j), so that the model is converted into three dimensions from one dimension, and generating a pipe fitting with different elbow angles beta and different relative curvature radiuses R/D 0;
(3) And (3) performing quick comparison simulation analysis on pipeline performances under different input conditions by using a reduced order analysis method: according to the first two steps, the rapid construction of the three-dimensional model of the water-cooling pipeline with the bent pipe with different bent pipe angles and relative curvature radiuses can be completed; performing performance research analysis on pipelines with different structures, namely performing performance comparison simulation analysis on pipeline three-dimensional models with different bent pipe angles and relative curvature radiuses under different input conditions; for the repeated CFD basic model calculation, a three-dimensional and one-dimensional coupling mode is adopted, a finite volume model of the CFD basic model is built based on a water cooling pipeline of a converter cooling system for finite element simulation analysis, a response curve about fluid flow-pressure drop is extracted, and a general ROM (read only memory) order reduction technology is adopted to generate a ROM order reduction model; the numerical value of the input flow is changed, and the three-dimensional simulation analysis is not needed to be carried out again, so that the pipeline pressure drop result can be obtained rapidly; that is, the whole pipeline is processed into a system by using a ROM model, a three-dimensional pipeline structure is converted into a one-dimensional model, the input is flow and the output is pressure drop.
In this embodiment, simulation modeling and analysis are performed on a locomotive with a bent pipe, and a locomotive water-cooling pipe is shown in fig. 1. The generated pipe fittings with different pipe bending angles, different curvature radiuses and different pipe diameters are shown in fig. 5-11, so that when the related parameters of the pipeline are changed, three-dimensional modeling can be automatically completed only by inputting key parameter data.
The scope of the present invention is not limited to the above embodiments, and various modifications and alterations of the present invention will become apparent to those skilled in the art, and any modifications, improvements and equivalents within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (1)
1. A parameterized rapid three-dimensional modeling and reduced-order analysis method for a water-cooled pipeline with an elbow is characterized by comprising the following steps of: the difference of the water-cooling pipeline structure with the bent pipe in the cooling system of the converter cabinet is that the bent pipe angle and the relative curvature radius of the pipe fitting are different, and the pipeline structure characteristics of the different bent pipe angles and the relative curvature radius are as follows: y=f (Φ (i), Φ (j)); in the expression, phi (i) is a functional relation of a bent pipe water-cooling pipeline path, phi (j) is a sweep algorithm for converting a pipeline model from one dimension to three dimension, and the construction and reduced order analysis method of the bent pipe water-cooling pipeline three-dimensional model comprises the following steps:
(1) Establishing a path model of a bent pipe water-cooling pipeline, and taking a bent pipe angle, a bent pipe radius, a horizontal Length of the pipeline along an X-axis direction and a vertical Length of the pipeline along a Y-axis direction of the bent pipe water-cooling pipeline as beta, R, length _H and Length_V respectively, wherein a coordinate system is defined firstly, an X-axis positive direction of an abscissa is directed to the right, and an Y-axis positive direction of an ordinate is directed to the upper;
The four points of the elbow path model from the starting point to the end point are O (x 0,y0)、A(x1,y1)、B(x2,y2) and C (x 3,y3) points in sequence, the four points take the starting point position O point (x 0,y0) of the pipeline as a reference, namely the O point is the starting point coordinate of a coordinate system, the A point, the B point and the C point are respectively defined, and the functional relation between the coordinates of the O, A, B and the C point and beta, R, length _H and length_V is as follows: phi (i) =f (β, R, length_h, length_v);
the coordinate relation between A, B and point C in the elbow water-cooling pipeline path model is as follows:
x1=x0+( y0+Length_V-R+ R*cosβ)/tanβ,y1= y0+Length_V-R+ R*cosβ;
x2= x1+R*sinβ= x0+( y0+Length_V-R+ R*cosβ)/tanβ+R*sinβ,y2=y0+Length_V;
x3= x0+Length_H,y3= y2=y0+Length_V；
(2) Establishing a pipeline three-dimensional structure with different elbow angles and different relative curvature radiuses, taking the pipeline diameter as D 0, constructing a pipeline shape with a circular section, and utilizing a general sweep algorithm phi (j) to sweep the pipeline section along the elbow pipeline path model created in the step (1), so that the model is converted into three dimensions from one dimension, and generating a pipe fitting with different elbow angles beta and different relative curvature radiuses R/D 0;
(3) And (3) performing quick comparison simulation analysis on pipeline performances under different input conditions by using a reduced order analysis method: according to the first two steps, the rapid construction of the three-dimensional model of the water-cooling pipeline with the bent pipe with different bent pipe angles and relative curvature radiuses can be completed; performing performance research analysis on pipelines with different structures, namely performing performance comparison simulation analysis on pipeline three-dimensional models with different bent pipe angles and relative curvature radiuses under different input conditions; for the repeated CFD basic model calculation, a three-dimensional and one-dimensional coupling mode is adopted, a finite volume model of the CFD basic model is built based on a water cooling pipeline of a converter cooling system for finite element simulation analysis, a response curve about fluid flow-pressure drop is extracted, and a general ROM (read only memory) order reduction technology is adopted to generate a ROM order reduction model; the numerical value of the input flow is changed, and the three-dimensional simulation analysis is not needed to be carried out again, so that the pipeline pressure drop result can be obtained rapidly; that is, the whole pipeline is processed into a system by using a ROM model, a three-dimensional pipeline structure is converted into a one-dimensional model, the input is flow and the output is pressure drop.
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| WO2021233258A1 (en) * | 2020-05-20 | 2021-11-25 | 中国第一汽车股份有限公司 | Pipeline optimization design method and gas exhaust pipeline |
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- 2021-12-28 CN CN202111615054.5A patent/CN114491880B/en active Active
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| DE102009054159A1 (en) * | 2009-11-23 | 2011-06-01 | Jnw Cleaningsolutions Gmbh | Cleaning device for cooling surfaces, particularly for air condensation systems, water coolers and chemical systems, has nozzle fitting with multiple cleaning nozzles |
| CN109775368A (en) * | 2019-01-31 | 2019-05-21 | 天辰化工有限公司 | A kind of negative-pressure pneumatic transmission system in drying acetylene production |
| WO2021233258A1 (en) * | 2020-05-20 | 2021-11-25 | 中国第一汽车股份有限公司 | Pipeline optimization design method and gas exhaust pipeline |
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