Surge pipe analysis method and apparatus

Abstract

The application relates to a fluctuation tube analysis method and device. The method comprises the following steps: acquiring a pipeline arrangement mode of each candidate fluctuation tube; determining a candidate fluctuation tube model matched with the pipeline arrangement mode of each candidate fluctuation tube; performing thermal stratification analysis on the candidate fluctuation tube based on the candidate fluctuation tube model to determine a thermal stratification effect of the candidate fluctuation tube; performing stress analysis on the candidate fluctuation tube based on the candidate fluctuation tube model to determine a stress effect of the candidate fluctuation tube; and performing performance analysis on each fluctuation tube based on the thermal stratification effects and the stress effects to determine a selected fluctuation tube from the candidate fluctuation tubes. The method can improve the stability of a pressure stabilization system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear power, in particular to a surge line analysis method and device. BACKGROUND

[0002] With the development of nuclear power technology, a nitrogen pressure stabilization scheme appears, which has the functions of pressure control, volume compensation and passive core emergency cooling. The surge line in the nitrogen pressure stabilization system is used to connect the fluid in the pressurizer and the fluid in the descending section of the pressure vessel, and is the main fluid transmission pipeline for controlling the pressure of the primary loop of the pressurizer, and is one of the important nuclear safety class I pipelines in the nuclear power plant.

[0003] In the conventional technology, when the pressure is controlled, there is a large difference in temperature and density between the fluid from the nitrogen pressure stabilization pipe and the fluid from the pressure vessel in the surge line, so that a thermal stratification phenomenon is formed in the surge line, which threatens the structural integrity of the surge line and causes unstable pressure stabilization. SUMMARY

[0004] Therefore, it is necessary to provide a surge line analysis method and device capable of improving the stability of pressure stabilization in view of the above technical problems.

[0005] In a first aspect, the present application provides a surge line analysis method, comprising:

[0006] obtaining a plurality of candidate surge lines each having a pipeline arrangement;

[0007] for each of the candidate surge lines, determining a candidate surge line model matched with the pipeline arrangement of the candidate surge line;

[0008] performing thermal stratification analysis on the candidate surge line based on the candidate surge line model to determine a thermal stratification effect of the candidate surge line;

[0009] performing stress analysis on the candidate surge line based on the candidate surge line model to determine a stress effect of the candidate surge line;

[0010] performing performance analysis on each of the surge lines based on the thermal stratification effects and the stress effects to determine a selected surge line from the candidate surge lines.

[0011] In one of the embodiments, the thermal stratification analysis on the candidate surge line based on the candidate surge line model to determine the thermal stratification effect of the candidate surge line comprises:

[0012] splitting the candidate surge line model to obtain a plurality of candidate surge line sub-models;

[0013] For each of the candidate fluctuation pipe sub-models, when the candidate fluctuation pipe sub-model is in a simulation running stage, a pipe temperature difference between a top pipe and a bottom pipe in the candidate fluctuation pipe sub-model is determined;

[0014] Based on the pipe temperature differences, a thermal stratification effect of the candidate fluctuation pipe is determined.

[0015] In one of the embodiments, the determining of the thermal stratification effect of the candidate fluctuation pipe based on the pipe temperature differences comprises:

[0016] For each of the candidate fluctuation pipe sub-models, pipe arrangement data corresponding to the candidate fluctuation pipe sub-model is obtained;

[0017] Based on the pipe arrangement data and the pipe temperature differences, data analysis is performed to determine a thermal stratification degree of the candidate fluctuation pipe sub-model;

[0018] Based on the thermal stratification degrees, the thermal stratification effect of the candidate fluctuation pipe is determined.

[0019] In one of the embodiments, the determining of the stress effect of the candidate fluctuation pipe based on the stress analysis of the candidate fluctuation pipe by the candidate fluctuation pipe model comprises:

[0020] Based on the stress analysis of the candidate fluctuation pipe by the candidate fluctuation pipe model, a stress nephogram corresponding to the candidate fluctuation pipe model is determined.

[0021] Based on stress distribution in the stress nephogram, the stress effect of the candidate fluctuation pipe is determined.

[0022] In one of the embodiments, the determining of the stress effect of the candidate fluctuation pipe based on the stress distribution in the stress nephogram comprises:

[0023] A cross-section of a node with the maximum stress in the stress nephogram is cut to obtain a cross-section nephogram corresponding to the node;

[0024] A stress analysis is performed on the cross-section nephogram to determine a stress value corresponding to the point cloud;

[0025] Based on a value of the stress value, the stress effect of the candidate fluctuation pipe is determined.

[0026] In one of the embodiments, the method further comprises:

[0027] According to a plurality of preset parameter change values, fluctuation pipe parameters of the selected fluctuation pipe are adjusted respectively to obtain a plurality of updated fluctuation pipes corresponding to the selected fluctuation pipe;

[0028] establish an updated surge line model for each of the updated surge lines based on the adjusted surge line parameters;

[0029] For each of the updated surge line models, perform thermal stratification analysis and stress analysis on the updated surge line model respectively to determine updated thermal stratification effect and updated stress effect of the updated surge line model;

[0030] Perform performance analysis on each of the updated surge lines based on the thermal stratification effect and the stress effect of each of the updated surge lines to determine a target surge line from the updated surge lines.

[0031] In a second aspect, the present application further provides a surge line analysis device, comprising:

[0032] A layout mode acquisition module is configured to acquire a pipeline layout mode of each of a plurality of candidate surge lines;

[0033] A surge line model determination module is configured to determine, for each of the candidate surge lines, a candidate surge line model matching the pipeline layout mode of the candidate surge line;

[0034] A thermal stratification analysis module is configured to perform thermal stratification analysis on the candidate surge line based on the candidate surge line model to determine thermal stratification effect of the candidate surge line;

[0035] A stress analysis module is configured to perform stress analysis on the candidate surge line based on the candidate surge line model to determine stress effect of the candidate surge line;

[0036] A performance analysis module is configured to perform performance analysis on each of the surge lines based on the thermal stratification effect and the stress effect of each of the surge lines to determine a selected surge line from the candidate surge lines.

[0037] In a third aspect, the present application further provides a computer device. The computer device comprises a memory and a processor, the memory stores a computer program, and the processor implements the steps of the method as described above when executing the computer program.

[0038] In a fourth aspect, the present application further provides a computer readable storage medium. The computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement the steps of the method as described above.

[0039] In a fifth aspect, the present application further provides a computer program product. The computer program product comprises a computer program, and the computer program is executed by a processor to implement the steps of the method as described above.

[0040] The wave tube analysis method and device can determine the pipeline arrangement of each candidate wave tube, determine the candidate wave tube model matching the pipeline arrangement of the candidate wave tube for each candidate wave tube, perform thermal stratification analysis on the candidate wave tube based on the candidate wave tube model, determine the thermal stratification effect of the candidate wave tube, perform stress analysis on the candidate wave tube based on the candidate wave tube model, determine the stress effect of the candidate wave tube, determine the thermal stratification effect and the stress effect of each candidate wave tube in a model simulation manner, and finally perform performance analysis on each wave tube based on the thermal stratification effects and the stress effects, and determine the selected wave tube from the candidate wave tubes, so that the wave tube with the best thermal stratification effect and the smallest stress pressure can be finally selected as the wave tube of the pressure stabilization system, thereby improving the stability of the pressure stabilization process. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings needed to be used in the description of the embodiments of the present application or the related art will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other related drawings can be obtained by those skilled in the art without creative labor.

[0042] Figure 1 An application environment diagram of the wave tube analysis method in an embodiment;

[0043] Figure 2 A flowchart of the wave tube analysis method in an embodiment;

[0044] Figure 3 A diagram of a non-encircling pipeline arrangement in an embodiment;

[0045] Figure 4 A diagram of a horizontally encircling pipeline arrangement in an embodiment;

[0046] Figure 5 A diagram of an encircling upward pipeline arrangement in an embodiment;

[0047] Figure 6 A diagram of an encircling downward pipeline arrangement in an embodiment;

[0048] Figure 7 A diagram of a zigzag pipeline arrangement in an embodiment;

[0049] Figure 8 A diagram of a wave tube splitting process in an embodiment;

[0050] Figure 9A flowchart of the fluctuation tube analysis step in one embodiment;

[0051] Figure 10 A cross-sectional view of the fluctuation tube analysis step in one embodiment;

[0052] Figure 11 A schematic diagram of a target fluctuation tube in one embodiment;

[0053] Figure 12 A flowchart of the fluctuation tube analysis method in another embodiment;

[0054] Figure 13 A block diagram of the structure of the fluctuation tube analysis device in one embodiment;

[0055] Figure 14 An internal structure diagram of the computer device in one embodiment. DETAILED DESCRIPTION

[0056] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0057] The fluctuation tube analysis method provided by the embodiments of the present application can be applied to, for example, Figure 1The application environment shown. Among them, the terminal 102 communicates with the server 104 through the network. The data storage system can store the data required by the server 104 to process. The data storage system can be integrated on the server 104, or placed on the cloud or other network servers. Among them, the terminal 102 can be, but not limited to, various personal computers, notebook computers, smart phones, tablet computers, Internet of Things devices and portable wearable devices, Internet of Things devices can be smart speakers, smart televisions, smart air conditioners, smart car devices, projection devices, etc. Portable wearable devices can be smart watches, smart bracelets, head-mounted devices, etc. Head-mounted devices can be virtual reality (VR) devices, augmented reality (AR) devices, smart glasses, etc. Specifically, the terminal 102 can include an image acquisition device or other acquisition device for acquiring the respective pipeline arrangement information of the candidate fluctuation pipes and determining the pipeline arrangement mode based on the pipeline arrangement information. The server 104 can be a standalone physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server providing cloud computing services. Specifically, the server 104 obtains the respective pipeline arrangement modes of a plurality of candidate fluctuation pipes from the terminal 102 in the process of analyzing the fluctuation pipe; for each candidate fluctuation pipe, determines a candidate fluctuation pipe model matching the pipeline arrangement mode of the candidate fluctuation pipe; based on the candidate fluctuation pipe model, performs thermal stratification analysis on the candidate fluctuation pipe to determine the thermal stratification effect of the candidate fluctuation pipe; based on the candidate fluctuation pipe model, performs stress analysis on the candidate fluctuation pipe to determine the stress effect of the candidate fluctuation pipe; based on the thermal stratification effects and the stress effects, performs performance analysis on the fluctuation pipes to determine a selected fluctuation pipe from the candidate fluctuation pipes.

[0058] In one exemplary embodiment, as shown in Figure 2 , a fluctuation pipe analysis method is provided, which is applied to the server 104 in Figure 1 for example, including the following steps S202 to S210. Among them:

[0059] Step S202, obtaining the respective pipeline arrangement modes of a plurality of candidate fluctuation pipes.

[0060] Among them, the candidate fluctuation pipe refers to the fluctuation pipe waiting to be selected, which can also be understood as the alternative fluctuation pipe. The pipeline arrangement mode refers to the specific arrangement mode of the pipeline of the fluctuation pipe.

[0061] Specifically, in the fluctuation tube analysis process, the server needs to first determine a plurality of candidate fluctuation tubes, and obtain the pipeline arrangement mode of each candidate fluctuation tube, so as to determine the pipeline arrangement of each candidate fluctuation tube. For example, in the present embodiment, the pipeline arrangement mode of the fluctuation tube includes non-circulating, horizontal circulating, circulating rising, circulating descending, and inverted U-shaped arrangement, etc. As shown in Figures 3-7 Figure 3 is a schematic diagram of the pipeline arrangement mode of non-circulating, Figure 4 is a schematic diagram of the pipeline arrangement mode of horizontal circulating, Figure 5 is a schematic diagram of the pipeline arrangement mode of circulating rising, Figure 6 is a schematic diagram of the pipeline arrangement mode of circulating descending, Figure 7 is a schematic diagram of the pipeline arrangement mode of inverted U-shaped arrangement.

[0062] Step S204, for each candidate fluctuation tube, determine a candidate fluctuation tube model matching the pipeline arrangement mode of the candidate fluctuation tube.

[0063] The candidate fluctuation tube model refers to a virtual model obtained by model simulation of the candidate fluctuation tube in a specific mode.

[0064] Specifically, after determining the pipeline arrangement mode of each candidate fluctuation tube, a corresponding candidate fluctuation tube model can be matched for each candidate fluctuation tube based on the pipeline arrangement mode, so as to facilitate subsequent analysis of the candidate fluctuation tube based on the candidate fluctuation tube model.

[0065] Step S206, based on the candidate fluctuation tube model, perform thermal stratification analysis on the candidate fluctuation tube to determine the thermal stratification effect of the candidate fluctuation tube.

[0066] The thermal stratification effect refers to the thermal stratification of the candidate fluctuation tube under typical working conditions. It can be understood that the more serious the thermal stratification effect, the more likely the candidate fluctuation tube is to stratify under typical working conditions, i.e., the pipeline arrangement mode of the candidate fluctuation tube does not help maintain the stability of the stable pressure system.

[0067] Specifically, after determining the corresponding candidate fluctuation tube model of each candidate fluctuation tube, the server can perform thermal stratification analysis on the candidate fluctuation tube based on the candidate fluctuation tube model to determine the thermal stratification effect of the candidate fluctuation tube. In some specific embodiments, since the pipeline arrangement mode of the candidate fluctuation tube can involve the setting of bends and pipeline angles, the server will split each candidate fluctuation tube model, and perform thermal stratification analysis on the plurality of candidate fluctuation tube sub-models respectively.

[0068] Step S208, based on the candidate fluctuation tube model, perform stress analysis on the candidate fluctuation tube to determine the stress effect of the candidate fluctuation tube.

[0069] ​Wherein, when the object is deformed due to external factors (such as force, humidity change, temperature field change, etc.), the internal force generated between the parts of the object is called stress when acting on a unit area. The stress effect refers to the effect of the stress that the candidate wave tube bears. It can be understood that the greater the stress effect, the greater the stress that the candidate wave tube bears, that is, the pipe arrangement mode of the candidate wave tube is not conducive to maintaining the stability of the stable pressure system.

[0070] Specifically, after determining the candidate wave tube model corresponding to each candidate wave tube, the server can perform stress analysis on the candidate wave tube based on the candidate wave tube model to determine the stress effect of the candidate wave tube. In a specific embodiment, the server can perform stress analysis on the candidate wave tube based on the candidate wave tube model to determine the stress cloud map corresponding to the candidate wave tube model, and determine the stress effect of the candidate wave tube based on the stress distribution in the stress cloud map. In another specific embodiment, the server can also pre-set a stress effect analysis model, perform stress analysis on the candidate wave tube based on the stress effect analysis model, and determine the stress effect of the candidate wave tube.

[0071] Step S210, performance analysis is performed on each wave tube based on each thermal stratification effect and each stress effect, and a selected wave tube is determined from each candidate wave tube.

[0072] Wherein, the selected wave tube refers to the wave tube selected as the target.

[0073] Specifically, after determining the thermal stratification effect and stress effect of each candidate wave tube, the server can perform performance analysis on each wave tube based on each thermal stratification effect and each stress effect, and determine a selected wave tube from each candidate wave tube. It can be understood that the weaker the thermal stratification effect and stress effect, the more suitable the candidate wave tube is used as the selected wave tube of the stable pressure system, and the more conducive to maintaining the stability of the stable pressure system.

[0074] The above wave tube analysis method obtains the pipe arrangement mode of each of the plurality of candidate wave tubes, can determine the pipe arrangement corresponding to each of the candidate wave tubes, determines the candidate wave tube model matched with the pipe arrangement mode of the candidate wave tube for each candidate wave tube, performs thermal stratification analysis on the candidate wave tube based on the candidate wave tube model to determine the thermal stratification effect of the candidate wave tube, performs stress analysis on the candidate wave tube based on the candidate wave tube model to determine the stress effect of the candidate wave tube, can determine the thermal stratification effect and stress effect of each candidate wave tube based on model simulation, and finally, performance analysis is performed on each wave tube based on each thermal stratification effect and each stress effect, and a selected wave tube is determined from each candidate wave tube. The wave tube with the best thermal stratification effect and the smallest stress pressure can be finally selected as the wave tube of the stable pressure system, thereby improving the stability of the stable pressure process.

[0075] In an example embodiment, the thermal stratification effect of the candidate surge pipe is determined based on the candidate surge pipe model, including: splitting the candidate surge pipe model to obtain a plurality of candidate surge pipe sub-models; for each candidate surge pipe sub-model, determining the pipe temperature difference between the top pipe and the bottom pipe in the candidate surge pipe sub-model under the condition that the candidate surge pipe model is in a simulation running stage; and determining the thermal stratification effect of the candidate surge pipe based on the pipe temperature differences.

[0076] The candidate surge pipe sub-model refers to a split model obtained by splitting the candidate surge pipe model. The simulation running stage refers to a process of simulating the running of the candidate surge pipe model based on the parameters of the actual working condition.

[0077] Specifically, in the process of thermal stratification analysis of the candidate surge pipe, as shown in FIG. 2, the server can first split the candidate surge pipe model to obtain a plurality of candidate surge pipe sub-models, and then, for each candidate surge pipe sub-model, determine the pipe temperature difference between the top pipe and the bottom pipe in the candidate surge pipe sub-model under the condition that the candidate surge pipe model is in a simulation running stage. Figure 8 Since the fluid flows through the surge pipe in the pressure control process, the fluid temperature in the nitrogen pressure stabilizer is low and the density is large, which will mainly gather in the lower part of the surge pipe cross section; the fluid temperature in the pressure vessel is high and the density is small, which will mainly gather in the upper part of the surge pipe cross section. This phenomenon is called surge pipe thermal stratification in the pressure stabilizer. This phenomenon will cause uneven temperature distribution on the upper and lower parts of the pipe wall, thereby causing overall bending thermal stress and local thermal stress in the surge pipe cross section. Therefore, the thermal stratification effect of the candidate surge pipe can be determined based on the pipe temperature differences.

[0078] In some specific embodiments, the thermal stratification effect can be determined by thermal fluid-solid coupling calculation. Specifically, the fluid-solid coupling heat transfer analysis is realized by the Fluent software under the ANSYS, the fluid flow heat transfer situation and the temperature change situation of the solid domain of the surge pipe under the actual transient running condition are simulated, the temperature difference at the wall thickness center position of the top end and the bottom end of the surge pipe is analyzed, and the inhibition effect of different surge pipe structures on thermal stratification is determined.

[0079] In this embodiment, the candidate surge pipe model is split, and the pipe temperature difference between the top pipe and the bottom pipe of each split candidate surge pipe sub-model is determined, and then the thermal stratification effect of the candidate surge pipe is judged, which can ensure the accuracy of the determination of the thermal stratification effect, and further improve the stability of the pressure stabilizing system.

[0080] In an example embodiment, the thermal stratification effect of the candidate fluctuation pipe is determined based on the temperature difference of each pipe, including: for each candidate fluctuation pipe model, obtaining pipe arrangement data corresponding to the candidate fluctuation pipe model; based on the pipe arrangement data and the temperature difference of the pipe, performing data analysis to determine the thermal stratification degree of the candidate fluctuation pipe model; and based on the thermal stratification degrees, determining the thermal stratification effect of the candidate fluctuation pipe.

[0081] The pipe arrangement data refers to specific parameter data of the pipe arrangement of the fluctuation pipe, for example, the pipe arrangement data can include pipe inclination angle, pipe inner diameter, etc. The thermal stratification degree refers to the degree of occurrence of thermal stratification phenomenon, which can also be understood as the thermal stratification suppression effect.

[0082] Specifically, after determining the temperature difference of the pipe between the top pipe and the bottom pipe in the candidate fluctuation pipe model, the server can determine the pipe arrangement data corresponding to each candidate fluctuation pipe model to determine the pipe arrangement of each candidate fluctuation pipe model. Since the pipe arrangement also affects the thermal stratification effect of the candidate fluctuation pipe model, the server can perform data analysis based on the pipe arrangement data and the temperature difference of the pipe to determine the thermal stratification degree of the candidate fluctuation pipe model, and determine the thermal stratification effect of the candidate fluctuation pipe based on the thermal stratification degrees.

[0083] In some specific embodiments, since the thermal stratification suppression effect analysis process combines numerical simulation results and theoretical analysis results, the occurrence of thermal stratification phenomenon depends on the ratio of buoyancy to fluid inertial force. The greater the buoyancy or the smaller the inertial force, the more likely thermal stratification occurs. In this embodiment, the thermal stratification degree is represented by the dimensionless number Richardson number (Ri):

[0084]

[0085] That is,

[0086] In the formula, g is the acceleration of gravity, which is 9.81 m2 / s, and when the pipe is inclined, it is rewritten as g x cos(θ); β is the thermal expansion coefficient of water, ℃-1; Di is the pipe inner diameter, m; ΔT is the temperature difference between cold and hot fluids, ℃; and u is the flow velocity of the fluid, m / s.

[0087] Generally, the size of the Ri number represents the possibility of the occurrence of thermal stratification phenomenon. If the Ri number is greater than 1, thermal stratification may occur. The Ri number represents the relative size of the buoyancy and the inertial force during fluid flow, wherein the buoyancy is caused by the density difference between cold and hot fluids, and its size is related to the fluid physical parameters and flow characteristic scales, and is directly related to the temperature difference existing in the flow field; and the size of the inertial force is related to the fluid physical parameters and flow characteristic scales, and depends on the flow velocity of the fluid.

[0088] In this embodiment, for each candidate fluctuation pipe model, the pipeline arrangement data and the pipeline temperature difference of the candidate fluctuation pipe model are comprehensively analyzed to determine the thermal stratification effect, which can ensure the accuracy of the determination of the thermal stratification effect.

[0089] In an exemplary embodiment, the stress effect of the candidate fluctuation pipe is determined based on the stress analysis of the candidate fluctuation pipe based on the candidate fluctuation pipe model, including: determining the stress nephogram corresponding to the candidate fluctuation pipe model based on the stress analysis of the candidate fluctuation pipe based on the candidate fluctuation pipe model; and determining the stress effect of the candidate fluctuation pipe based on the stress distribution in the stress nephogram.

[0090] The stress nephogram is a way used in physics to express the stress field of an object in a graph. The stress nephogram mainly includes two types, color nephogram and gray-scale nephogram. The color nephogram uses different colors to represent different stresses, while the gray-scale nephogram uses different gray scales to correspond to different stresses.

[0091] Specifically, the server can determine the stress nephogram corresponding to the candidate fluctuation pipe model based on the stress analysis of the candidate fluctuation pipe based on the candidate fluctuation pipe model. Since the stress nephogram can express the stress field of an object, the server can determine the stress effect of the candidate fluctuation pipe based on the stress distribution in the stress nephogram. In some specific embodiments, the server can calculate the stress nephogram of the candidate fluctuation pipe model through workbench.

[0092] In this embodiment, the stress effect of the candidate fluctuation pipe is determined based on the stress distribution in the stress nephogram of the candidate fluctuation pipe model, which can ensure the accuracy of the determination of the stress effect.

[0093] In an exemplary embodiment, the stress effect of the candidate fluctuation pipe is determined based on the stress distribution in the stress nephogram, including: performing cross-section cutting on the node with the maximum stress in the stress nephogram to obtain the cross-section nephogram corresponding to the node; performing stress analysis on the cross-section nephogram to determine the stress value corresponding to the point cloud; and determining the stress effect of the candidate fluctuation pipe based on the numerical value of the stress value.

[0094] The cross-section nephogram refers to the stress nephogram corresponding to the cross-section of the fluctuation pipe.

[0095] Specifically, after determining the stress nephogram corresponding to the candidate wave tube model, the server can first determine the node with the maximum stress in the stress nephogram, and perform cross-section cutting on the stress nephogram based on the node to obtain a cross-section nephogram corresponding to the node, and then perform stress analysis on the cross-section nephogram to determine the stress value corresponding to the point cloud, and determine the stress effect of the candidate wave tube based on the numerical value of the stress value. In a specific embodiment, the server can compare the equivalent stress distribution and size of the structure after the temperature, pressure load and gravity load of the wave tube are applied to the most severe thermal delamination, and perform linear stress analysis along the wall thickness direction at the maximum equivalent stress to obtain a first plus second stress value, and compare the first plus second stress value with the relevant specification in ASME (American Society of Mechanical Engineers), to determine whether the wave tube under this state meets the requirements in the specification.

[0096] In this embodiment, cross-section cutting and analysis based on the point with the maximum stress in the stress nephogram can ensure the accuracy of the stress effect determination.

[0097] In an exemplary embodiment, the wave tube analysis method further includes: adjusting the wave tube parameters of the selected wave tube according to a plurality of preset parameter change values, respectively, to obtain a plurality of updated wave tubes corresponding to the selected wave tube; establishing an updated wave tube model corresponding to each updated wave tube based on the adjusted wave tube parameters; for each updated wave tube model, performing thermal delamination analysis and stress analysis on the updated wave tube model, respectively, to determine the updated thermal delamination effect and the updated stress effect of the updated wave tube model; and performing performance analysis on each updated wave tube based on the thermal delamination effects and the stress effects, to determine a target wave tube from the updated wave tubes.

[0098] The parameter change value refers to the change value of various parameters of the wave tube, for example, the change value of the pipe diameter, the pipe length, the inclination angle and the wall thickness.

[0099] Specifically, after determining the selected fluctuation pipe with better performance in the pipe arrangement mode, the server can perform parameter adjustment on the selected fluctuation pipe, that is, adjust the fluctuation pipe parameters of the selected fluctuation pipe according to a plurality of preset parameter change values respectively to obtain a plurality of updated fluctuation pipes corresponding to the selected fluctuation pipe, and then re-perform performance analysis on the updated fluctuation pipe in the manner in the above embodiment to finally determine the target fluctuation pipe corresponding to the group of change parameters with the best performance in the pipe arrangement mode, that is, the server can adjust the fluctuation pipe parameters of the selected fluctuation pipe according to a plurality of preset parameter change values respectively to obtain a plurality of updated fluctuation pipes corresponding to the selected fluctuation pipe, establish an updated fluctuation pipe model for each updated fluctuation pipe based on the adjusted fluctuation pipe parameters, perform thermal stratification analysis and stress analysis on each updated fluctuation pipe model respectively, determine the updated thermal stratification effect and the updated stress effect of the updated fluctuation pipe model, perform performance analysis on each updated fluctuation pipe based on the thermal stratification effects and the stress effects, and determine the target fluctuation pipe from the updated fluctuation pipes.

[0100] In the embodiment, after determining the selected fluctuation pipe with better performance in the pipe arrangement mode, the server can perform parameter adjustment on the selected fluctuation pipe, and can finally determine a target fluctuation pipe with relatively best performance, which is beneficial to guarantee the stability of the pressure stabilizing system.

[0101] In one specific embodiment, a nitrogen pressure stabilizer fluctuation pipe design optimization process and an optimal arrangement scheme and structure obtained based on the process are also provided. The fluctuation pipe can effectively alleviate thermal stratification and has a simple structure, which is convenient for installation and maintenance in actual engineering applications.

[0102] The implementation process includes the following contents:

[0103] Based on existing experience, several fluctuation pipe arrangement modes are determined: non-circumferential arrangement, horizontal circumferential arrangement, circumferential upward arrangement, circumferential downward arrangement, and several-shaped arrangement. The highest temperature and pressure in each working condition are loaded as temperature and pressure loads on the fluctuation pipes in these arrangement modes.

[0104] After loading the loads, it is found that the stress of the bend of the fluctuation pipe in the non-circumferential arrangement is more than 2 times larger than that in other arrangement modes. This phenomenon is mainly due to the fact that the thermal elongation of the fluctuation pipe is concentrated at the bend in the horizontal arrangement, causing the inside to be compressed and the outside to be stretched. Therefore, this arrangement is not considered.

[0105] Several remaining arrangement modes are selected: horizontal surrounding, surrounding ascending, surrounding descending, and several-shaped arrangement, and thermal fluid-solid coupling calculation and structural mechanics evaluation under typical working conditions are carried out. In the thermal fluid-solid coupling calculation process, the fluctuating pipe thermal fluid-solid coupling analysis based on the computational fluid dynamics software is realized, which is highly consistent with the actual running state. The top and bottom temperature differences of the fluctuating pipe in multiple temperature measurement sections are mainly compared, and the influence of different arrangement modes on thermal stratification is analyzed. The structural mechanics evaluation part mainly compares the maximum stress of the fluctuating pipe structure under different arrangement modes and whether the mechanical state meets the requirements of the relevant specifications.

[0106] Based on the above thermal fluid-solid coupling calculation and structural mechanics evaluation results of a good one of the fluctuating pipe arrangement modes, analysis and research on the remaining structural parameters of the fluctuating pipe are carried out, including pipe diameter, length, inclination angle, wall thickness, etc., and the influence of the above parameters on the thermal stratification in the fluctuating pipe and the structural mechanics characteristics is explored.

[0107] Finally, the best arrangement scheme and related parameters of the nitrogen pressure stabilizer fluctuating pipe are determined.

[0108] The fluctuating pipe of the best scheme is analyzed under marine working conditions, and fatigue analysis and safety checking under multiple working conditions are carried out, further proving that the fluctuating pipe designed based on the optimization process can withstand the action of multiple working conditions and multiple cycles.

[0109] After fatigue analysis and checking of the fluctuating pipe arrangement scheme, the best fluctuating pipe arrangement scheme in the present application is obtained.

[0110] The best arrangement scheme of the nitrogen pressure stabilizer fluctuating pipe is:

[0111] The fluctuating pipe comprises a first horizontal section, a first connecting section, a surrounding downward inclined section, a second connecting section, a second horizontal section, a third connecting section, and a vertical section, which are connected in sequence; the first horizontal section is connected with the descending section of the pressure vessel, the first and second connecting sections are used to connect the horizontal section and the inclined section, the third connecting section is used to connect the horizontal section and the vertical section, and the lower end of the vertical section is connected with the stabilizer tank and the vertical fluctuating pipe in the tank.

[0112] As an improvement of the nitrogen pressure stabilizer fluctuating pipe, the arrangement mode of the fluctuating pipe is suitable for small pressurized water reactors and nitrogen pressure stabilizing systems, and meets the compact arrangement requirements of small pressurized water reactors. The extension of the vertical section of the fluctuating pipe is inserted into the liquid surface of the stabilizer tank from top to bottom.

[0113] As an improvement of the nitrogen pressure stabilizer fluctuating pipe, the surrounding downward inclined section forms an angle of 5°-15° with the horizontal plane, which can be determined according to the actual fluctuating pipe arrangement space limitation. The angles between the sections in this pipe section and the horizontal plane are consistent.

[0114] As an improvement of the nitrogen pressure stabilizer fluctuation pipe, the length of the "mouth" type area formed around the descending section is close to the diameter of the stabilizer tank.

[0115] As an improvement of the nitrogen pressure stabilizer fluctuation pipe, the first horizontal section, the first connecting section, the descending section around the downward inclined section, the second connecting section, the second horizontal section, the third connecting section and the vertical section are all made of 316LN stainless steel, and are made of stainless steel pipes with consistent inner and outer diameters.

[0116] As an improvement of the nitrogen pressure stabilizer fluctuation pipe, the radius of the elbow of the first and second connecting sections is 1.5-2 times the outer diameter of the straight pipe section.

[0117] Specifically, the stabilizer fluctuation pipe needs to be strictly experimentally studied before being put into formal use in a nuclear power plant. With the substantial improvement of computer performance in recent years, numerical simulation research of the fluctuation pipe is becoming an important means of safety analysis of the fluctuation pipe. Compared with experimental research, numerical simulation can greatly reduce the investment, and the results can be verified with each other.

[0118] The embodiment provides a fluctuation pipe arrangement scheme optimization process. Please refer to Figure 9 , and the specific process is as follows:

[0119] Step 102, several fluctuation pipe arrangement modes are determined based on existing experience: no surrounding, horizontal surrounding, surrounding upward, surrounding downward and Chinese character shape.

[0120] Specifically, the no surrounding arrangement mode (see Figure 3 ) is that the fluctuation pipe is connected to three pipe sections 01, 02 and 03 through two 90-degree elbows in the horizontal direction, wherein 01 is relatively short and is connected to the descending section of the pressure vessel, the straight pipe section 02 is connected to the fluctuation pipe 03 section through a 90-degree elbow arranged in the horizontal plane, and 03 is connected to the stabilizer tank; the horizontal surrounding, surrounding upward and surrounding downward arrangement modes can be referred to Figures 4-6 ; the Chinese character shape arrangement (see Figure 7 ) is that four 90-degree elbows and three straight pipe sections are added to the 02 section on the basis of the no surrounding arrangement to form a Chinese character shape structure for absorbing pipe deformation.

[0121] Step 103, the highest temperature borne by the fluctuation pipe under the selected working condition is loaded as the temperature load, and the highest pressure is loaded as the pressure load.

[0122] Specifically, the selected working condition has wide working condition envelope, and can cover the temperature, pressure and other parameter ranges of the remaining working conditions. The highest temperature and pressure of the selected working condition are loaded to the fluctuation pipe as the temperature and pressure load, which can cover all temperature and pressure conditions in the considered working condition range, and is used to study the mechanical properties of the fluctuation pipe under the extreme working condition.

[0123] Step 104, the arrangement with obviously greater stress result is eliminated through numerical calculation.

[0124] Specifically, in this design, it is found that the ability of other arrangements to absorb thermal deformation is stronger than that of the non-encircling arrangement, resulting in the maximum stress value at the elbow of the non-encircling arrangement being more than 2 times larger than that of other arrangements, so the non-encircling arrangement is not considered.

[0125] Step 105, select the remaining arrangement, and carry out thermal fluid-solid coupling calculation and structure evaluation under typical working conditions.

[0126] Specifically, the thermal fluid-solid coupling calculation mainly realizes fluid-solid coupling heat transfer analysis through Fluent software under ANSYS, simulates the fluid flow and heat transfer of the wave tube under actual transient operating conditions, and the temperature change of the wave tube solid domain, as shown in Figure 10 The temperature difference at the center of the wall thickness at the top and bottom of the wave tube is analyzed to determine the inhibitory effect of different wave tube structures on thermal stratification. The structure evaluation part mainly compares the equivalent stress distribution and size of the wave tube structure under the most severe thermal stratification temperature, pressure load and gravity load, and does stress linearization analysis along the wall thickness direction at the maximum equivalent stress position, compares the primary plus secondary stress value with the relevant specification in ASME, and determines whether the wave tube under this state meets the requirements in the specification.

[0127] It should be noted that the thermal stratification suppression effect analysis process combines numerical simulation results and theoretical analysis results, and the occurrence of thermal stratification depends on the ratio of buoyancy to fluid inertia force. The greater the buoyancy or the smaller the inertia force, the more likely thermal stratification occurs. In this embodiment, the degree of thermal stratification is represented by the dimensionless number Richardson number (Ri):

[0128]

[0129] That is,

[0130] In the formula, g is the acceleration of gravity, taking 9.81 m2 / s, and when the pipeline is inclined, it is rewritten as g×cos(θ); β is the thermal expansion coefficient of water, ℃-1; Di is the inner diameter of the pipeline, m; ΔT is the temperature difference between cold and hot fluids, ℃; u is the flow velocity of the fluid, m / s.

[0131] Generally, the size of the Ri number represents the possibility of thermal stratification. If the Ri number is greater than 1, thermal stratification is likely to occur. The Ri number represents the relative size of the buoyancy force and the inertial force in the fluid flow process, wherein the buoyancy force is caused by the density difference between the cold and hot fluids, and the size is directly related to the temperature difference existing in the flow field, in addition to the fluid physical parameters and flow characteristic scale; and the size of the inertial force depends on the flow velocity of the fluid, in addition to the fluid physical parameters and flow characteristic scale.

[0132] Step 106, preliminarily selecting one of the better arrangement modes.

[0133] Specifically, under the premise of considering the specific arrangement space of the undulating tube, according to the calculation results of the previous step, the selected arrangement mode has obvious advantages in thermal stratification suppression effect and mechanical properties.

[0134] Step 107, based on the above arrangement mode, carrying out sensitivity analysis of the remaining parameters of the undulating tube, including pipe diameter, pipe length, inclination angle, pipe wall thickness, etc.

[0135] Specifically, the influence of undulating tubes with different pipe diameters, pipe lengths, inclination angles and wall thicknesses on thermal stratification suppression effect and structural mechanical properties is studied, and the conclusion is that small-diameter undulating tubes have obvious thermal stratification suppression effect, large-wall-thickness undulating tubes have certain advantages in structural mechanics, increasing the inclination angle is beneficial to relieving thermal stratification, and changing the length of the undulating tube has no obvious influence on thermal stratification suppression effect and structural mechanical properties.

[0136] Step 108, determining the best arrangement mode and related parameters of the nitrogen pressure stabilizer undulating tube.

[0137] Specifically, combining the actual undulating tube design parameter range and arrangement space limitation, and considering the difficulty and habit of arrangement in engineering, a set of best arrangement parameters of the nitrogen pressure stabilizer undulating tube is determined.

[0138] Step 109, based on the best arrangement mode and parameters, carrying out related research of the undulating tube under marine conditions and fatigue analysis and safety check under multi-condition action.

[0139] Specifically, the multi-condition action considers the continuous occurrence of conditions such as linear power increase, linear power decrease and full power operation, to check the reliability of the selected undulating tube. If the nuclear power plant is operated at sea, the influence of special movements such as roll and pitch under marine conditions on the thermal stratification and mechanical properties of the undulating tube needs to be studied, and the marine condition needs to be included in the multi-condition action. The fatigue analysis mainly follows the related methods in the ASME specification to determine the fatigue accumulation of the undulating tube under thermal stratification and other loads.

[0140] Step 110, judge whether the fluctuation tube based on the current best parameter arrangement can pass the check, if yes, proceed to step 111, if not, return to step 108 to reselect the best arrangement parameter according to the sensitivity analysis result, if still not, return to step 106 to reselect the arrangement mode of the fluctuation tube.

[0141] Step 111, obtain the optimal arrangement scheme of the fluctuation tube in the embodiment.

[0142] Specifically, the optimal arrangement scheme of the fluctuation tube can meet the fatigue design and safety requirements under multiple working conditions on the premise of better inhibitory effect on thermal stratification and structural mechanical properties.

[0143] The application provides the arrangement scheme obtained based on the above-mentioned optimization process, please refer to Figure 11 , which comprises a first horizontal section (10-12), a first connecting section (20), a circumferential downward inclined section (30-38), a second connecting section (40), a second horizontal section (50-52), a third connecting section (60) and a vertical section (70), and the above-mentioned tube sections are sequentially connected.

[0144] Specifically, 10 in the first horizontal section is connected with a descending section of the pressure container, the first connecting section 20 is used for connecting the horizontal section 12 and the inclined section 30, the second connecting section 40 is used for connecting the inclined section 38 and the horizontal section 50, the third connecting section 60 is used for connecting the horizontal section 52 and the vertical section 70, and the lower end of the vertical section 70 is connected with a stabilizer tank body and a vertical fluctuation tube in the tank body.

[0145] Specifically, the included angles between the straight sections 30, 32, 34, 36 and 38 in the circumferential downward inclined section and the horizontal plane are consistent, facilitating the design and installation of the fluctuation tube in actual engineering application, and the inclined mode has better inhibitory effect on thermal stratification and can better relieve thermal stress during operation.

[0146] Specifically, the connecting sections 20 and 40 are elbow pipes used for connecting the horizontal section and the inclined section, the radii of the elbow pipes are consistent; 11, 31, 33, 35, 37, 51 and 60 are 90° elbows with the same radius, and the same parameters are adopted to facilitate the modular design and installation of the fluctuation tube. The material of the fluctuation tube is selected from 316LN stainless steel.

[0147] Specifically, spring hangers and spring dampers are designed in the middle of the tube sections 12-20-30 and the middle of the straight sections 32, 34 and 36, which are used for bearing the gravity of the fluctuation tube and the internal coolant and absorbing the swing acceleration load under the marine working condition.

[0148] Compared with the prior art, the nitrogen stabilizer fluctuation tube provided by the application, please refer to Figures 1-2By setting the surrounding downward inclined segment (30-38), the heat stratification phenomenon can be effectively alleviated; the overall main body part is in a spiral descending state and is approximately in the shape of a Chinese character "kou", so that the thermal stress during overall operation can be effectively alleviated; and the pipe segment structure does not contain internal components, is simple in structure, and will not affect the reactor plant structure and overall arrangement, and is also convenient for processing and manufacturing.

[0149] Compared with the prior art, the beneficial technical effects of the embodiment are that: the fluctuation pipe arrangement scheme provided by the embodiment fully considers the parameters that have influence on the structural safety and heat stratification suppression capability of the fluctuation pipe, such as different arrangement modes, inclination modes, pipe diameters, pipe lengths, inclination angles, and wall thicknesses, obtains the fluctuation pipe arrangement scheme that has the best performance in terms of structural stress and heat stratification suppression based on reasonable analysis methods and paths, and performs safety analysis and checking on the fatigue of the scheme under multiple working conditions to meet the standards in the relevant specifications; in addition, the pressurizer fluctuation pipe is provided with a surrounding downward inclined segment and a proper inner diameter, so that the heat stratification phenomenon can be effectively alleviated. The main part of the structure is in a surrounding descending state, which can effectively absorb the thermal deformation of the pipe after thermal expansion and relieve the thermal stress in the pipe. The pipe segment structure only contains 4 spring hangers and 4 spring dampers, which are used to bear the weight of the pipe structure and the internal coolant and suppress the rolling under marine conditions. The overall structure is simple, does not affect the structure and arrangement within the reactor core shield structure, and is convenient for processing and manufacturing.

[0150] In some specific embodiments, the nitrogen pressurizer fluctuation pipe arrangement scheme optimization process is as follows: first, several arrangement modes are proposed based on the existing fluctuation pipe design experience, and it is found that the stress at the elbow is obviously too large and the absorption capacity for thermal deformation is poor when not arranged in a surrounding manner after loading the highest temperature and pressure load of the selected working condition; the thermal fluid-structure coupling calculation and structural mechanics performance evaluation under the specified working condition are carried out based on the computational fluid dynamics software and the structural analysis software for the remaining several arrangement modes, and a better fluctuation pipe arrangement mode is selected; the sensitivity analysis of the related parameters is carried out based on the better arrangement mode, and the best arrangement scheme and specific parameters of the nitrogen pressurizer fluctuation pipe are finally determined; based on the best fluctuation pipe selection, the fatigue analysis under multiple working conditions is carried out to determine whether the fluctuation pipe meets the fatigue design requirements in the ASME and the relevant specifications; if the requirements are met, the optimal fluctuation pipe arrangement scheme in the present application is obtained.

[0151] The specific arrangement scheme of the nitrogen pressurizer fluctuation pipe comprises a first horizontal segment, a first connecting segment, a surrounding downward inclined segment, a second connecting segment, a second horizontal segment, a third connecting segment, and a vertical segment which are sequentially connected; the first horizontal segment is connected with the pressure vessel descending segment; the first and second connecting segments are used to connect the horizontal pipe segment and the inclined pipe segment; the lower end of the vertical segment is connected with the pressurizer tank body and the vertical fluctuation pipe inside the tank body; the surrounding downward inclined segment is in the shape of a Chinese character "kou" and the side length is close to the diameter of the pressurizer tank body.

[0152] Specifically, the angle between each segment of the downward inclined segment and the horizontal plane is consistent with the angle of the horizontal segment, and is in the range of 5°-15°; each pipe segment is made of 316LN stainless steel seamless steel pipe with the same outer diameter; the first and second connecting segments are used to connect the horizontal pipe segment and the inclined pipe segment, the radius of the connecting segment is 8D-12D, and D is the outer diameter of the undulating pipe; the outer diameter of the undulating pipe is between 75 mm and 125 mm, and the wall thickness of the undulating pipe is between 7 mm and 15 mm; the radius of the bend for connecting the undulating pipe is between 1.5D and 2D, and D is the outer diameter of the undulating pipe.

[0153] In one specific embodiment, as shown in FIG. 1, there is also provided an undulating pipe analysis method, comprising: Figure 12

[0154] Step S1201, obtaining the pipeline arrangement of each candidate undulating pipe, for each candidate undulating pipe, determining a candidate undulating pipe model matched with the pipeline arrangement of the candidate undulating pipe;

[0155] Step S1202, splitting the candidate undulating pipe model to obtain a plurality of candidate undulating pipe sub-models, for each candidate undulating pipe sub-model, determining the pipeline temperature difference between the top pipe and the bottom pipe in the candidate undulating pipe sub-model under the condition that the candidate undulating pipe model is in the simulation running stage;

[0156] Step S1203, for each candidate undulating pipe sub-model, obtaining pipeline arrangement data corresponding to the candidate undulating pipe sub-model, performing data analysis based on the pipeline arrangement data and the pipeline temperature difference, determining the thermal stratification degree of the candidate undulating pipe sub-model, and determining the thermal stratification effect of the candidate undulating pipe based on the thermal stratification degrees;

[0157] Step S1204, performing stress analysis on the candidate undulating pipe based on the candidate undulating pipe model, determining a stress nephogram corresponding to the candidate undulating pipe model, performing cross-section cutting on the node with the maximum stress in the stress nephogram to obtain a cross-section nephogram corresponding to the node;

[0158] Step S1205, performing stress analysis on the cross-section nephogram to determine the stress value corresponding to the point cloud, and determining the stress effect of the candidate undulating pipe based on the numerical value of the stress value;

[0159] Step S1206, performing performance analysis on each undulating pipe based on the thermal stratification effects and the stress effects, and determining a selected undulating pipe from the candidate undulating pipes;

[0160] Step S1207, adjusting the undulating pipe parameters of the selected undulating pipe according to a plurality of preset parameter change values to obtain a plurality of updated undulating pipes corresponding to the selected undulating pipe, and establishing an updated undulating pipe model corresponding to each updated undulating pipe based on the adjusted undulating pipe parameters; ​

[0161] In step S1208, for each updated fluctuation tube model, a thermal stratification analysis and a stress analysis are respectively performed on the updated fluctuation tube model to determine an updated thermal stratification effect and an updated stress effect of the updated fluctuation tube model.

[0162] In step S1209, based on the thermal stratification effects and the stress effects, a performance analysis is performed on the updated fluctuation tubes to determine a target fluctuation tube from the updated fluctuation tubes.

[0163] It should be understood that, although each step in the flowchart involved in each of the above-described embodiments is shown in sequence according to the arrow, these steps are not necessarily executed in sequence according to the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other sequences. Moreover, at least part of the steps in the flowchart involved in each of the above-described embodiments can include multiple steps or stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence of these steps or stages is not necessarily sequential, but can be executed in rotation or alternation with at least part of other steps or stages or steps or stages therein.

[0164] Based on the same inventive concept, the embodiments of the present application also provide a fluctuation tube analysis device for implementing the above-mentioned fluctuation tube analysis method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, and therefore the specific limitations in one or more fluctuation tube analysis device embodiments provided below can refer to the limitations of the fluctuation tube analysis method described above, which will not be described here again.

[0165] In one exemplary embodiment, as shown in FIG. 13, Figure 13 a fluctuation tube analysis device 1300 is provided, comprising an arrangement obtaining module 1302, a fluctuation tube model determining module 1304, a thermal stratification analysis module 1306, a stress analysis module 1308, and a performance analysis module 1310, wherein:

[0166] The arrangement obtaining module 1302 is configured to obtain the pipeline arrangement of each of the plurality of candidate fluctuation tubes.

[0167] The fluctuation tube model determining module 1304 is configured to, for each candidate fluctuation tube, determine a candidate fluctuation tube model matched with the pipeline arrangement of the candidate fluctuation tube.

[0168] The thermal stratification analysis module 1306 is configured to perform a thermal stratification analysis on the candidate fluctuation tube based on the candidate fluctuation tube model to determine a thermal stratification effect of the candidate fluctuation tube.

[0169] The stress analysis module 1308 is configured to perform stress analysis on the candidate wave pipe based on the candidate wave pipe model, and determine a stress effect of the candidate wave pipe.

[0170] The performance analysis module 1310 is configured to perform performance analysis on each wave pipe based on each thermal stratification effect and each stress effect, and determine a selected wave pipe from the candidate wave pipes.

[0171] In an example embodiment, the thermal stratification analysis module 1306 includes:

[0172] The model splitting unit is configured to split the candidate wave pipe model to obtain a plurality of candidate wave pipe sub-models.

[0173] The temperature difference determination unit is configured to, for each candidate wave pipe sub-model, determine a pipe temperature difference between the top pipe and the bottom pipe in the candidate wave pipe sub-model when the candidate wave pipe model is in the simulation running stage.

[0174] The thermal stratification effect determination unit is configured to determine a thermal stratification effect of the candidate wave pipe based on the pipe temperature differences.

[0175] In an example embodiment, the thermal stratification effect determination unit is specifically configured to:

[0176] For each candidate wave pipe sub-model, obtain pipe arrangement data corresponding to the candidate wave pipe sub-model;

[0177] Perform data analysis based on the pipe arrangement data and the pipe temperature difference to determine a thermal stratification degree of the candidate wave pipe sub-model;

[0178] Determine the thermal stratification effect of the candidate wave pipe based on the thermal stratification degrees.

[0179] In an example embodiment, the stress analysis module 1308 includes:

[0180] The stress nephogram determination unit is configured to perform stress analysis on the candidate wave pipe based on the candidate wave pipe model, and determine a stress nephogram corresponding to the candidate wave pipe model.

[0181] The stress effect determination unit is configured to determine a stress effect of the candidate wave pipe based on stress distribution in the stress nephogram.

[0182] In an example embodiment, the stress effect determination unit is specifically configured to:

[0183] Perform cross-section cutting on a node with the maximum stress in the stress nephogram to obtain a cross-section nephogram corresponding to the node;

[0184] Perform stress analysis on the cross-section nephogram to determine a stress value corresponding to the point cloud.

[0185] Determine stress effects of the candidate fluctuation tube based on numerical values of the stress.

[0186] In an exemplary embodiment, the fluctuation tube analysis apparatus 1300 further comprises a fluctuation tube updating module, specifically configured to:

[0187] Adjust fluctuation tube parameters of the selected fluctuation tube according to preset numerical values of a plurality of parameter variations, to obtain a plurality of updated fluctuation tubes corresponding to the selected fluctuation tube;

[0188] Establish an updated fluctuation tube model for each updated fluctuation tube based on the adjusted fluctuation tube parameters;

[0189] For each updated fluctuation tube model, perform thermal stratification analysis and stress analysis on the updated fluctuation tube model, to determine updated thermal stratification effects and updated stress effects of the updated fluctuation tube model;

[0190] Perform performance analysis on the updated fluctuation tubes based on the thermal stratification effects and the stress effects, to determine a target fluctuation tube from the updated fluctuation tubes.

[0191] Each module in the fluctuation tube analysis apparatus described above can be realized by software, hardware, or a combination thereof, in whole or in part. Each module described above can be embedded in or independent of a processor in a computer device in hardware form, or stored in a memory in a computer device in software form, so as to be called and executed by a processor to perform operations corresponding to each module.

[0192] In an exemplary embodiment, a computer device is provided, which can be a terminal, and an internal structure diagram of the computer device can be as shown in Figure 14The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. The processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for running the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is configured to exchange information between the processor and external devices. The communication interface of the computer device is configured to perform wired or wireless communication with external terminals, and the wireless communication can be achieved through WIFI, mobile cellular network, near field communication (NFC) or other technologies. The computer program is executed by the processor to implement a fluctuation tube analysis method. The display unit of the computer device is configured to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer overlaid on the display screen, or can be a key, trackball or touchpad arranged on the shell of the computer device, or can be an external keyboard, touchpad or mouse, etc.

[0193] Those skilled in the art can understand that, Figure 14 The skilled in the art can understand that,

[0194] In one embodiment, a computer device is provided, including a memory and a processor, the memory stores a computer program, and the processor executes the computer program to implement the steps of the above method.

[0195] In one embodiment, a computer readable storage medium is provided, which stores a computer program, and the computer program is executed by a processor to implement the steps of the above method.

[0196] In one embodiment, a computer program product is provided, including a computer program, and the computer program is executed by a processor to implement the steps of the above method.

[0197] It should be noted that the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or authorized by all parties, and the collection, use and processing of related data need to comply with relevant regulations.

[0198] It can be understood by those skilled in the art that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing related hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium. When the computer program is executed, it can include the processes of the above-mentioned embodiments of each method. In the embodiments provided in the present application, any reference to memory, database or other medium can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (Read-Only Memory, ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (Resistive Random Access Memory, ReRAM), magnetoresistive random access memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric memory (Ferroelectric Random Access Memory, FRAM), phase change memory (Phase Change Memory, PCM), graphene memory, etc. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (Artificial Intelligence, AI) processor, etc., without being limited thereto.

[0199] Any technical features in the above embodiments can be combined, and for the sake of brevity, not all possible combinations are described above, however, any combination of these technical features is deemed to be within the scope of the present application.

[0200] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A method of analyzing a wave tube, characterized by, The method comprises: obtaining the pipeline arrangement of each of the plurality of candidate wave pipes; for each of the candidate wave pipes, determining a candidate wave pipe model matching the pipeline arrangement of the candidate wave pipe; splitting the candidate wave pipe model to obtain a plurality of candidate wave pipe sub-models; for each of the candidate wave pipe sub-models, determining the temperature difference between the top pipe and the bottom pipe in the candidate wave pipe sub-model under the condition that the candidate wave pipe model is in the simulation running stage; based on the temperature differences of the pipes, determining the thermal stratification effect of the candidate wave pipe; based on the candidate wave pipe model, performing stress analysis on the candidate wave pipe to determine the stress nephogram corresponding to the candidate wave pipe model; based on the stress distribution in the stress nephogram, determining the stress effect of the candidate wave pipe; based on the thermal stratification effects and the stress effects, performing performance analysis on the wave pipes to determine the selected wave pipe from the candidate wave pipes.

2. The method of claim 1, wherein, The method further comprises: adjusting the wave pipe parameters of the selected wave pipe according to a plurality of preset parameter change values to obtain a plurality of updated wave pipes corresponding to the selected wave pipe; based on the adjusted wave pipe parameters, establishing an updated wave pipe model for each of the updated wave pipes; for each of the updated wave pipe models, performing thermal stratification analysis and stress analysis on the updated wave pipe model to determine the updated thermal stratification effect and the updated stress effect of the updated wave pipe model; 3. The method of claim 2, wherein, based on the thermal stratification effects and the stress effects, performing performance analysis on the updated wave pipes to determine the target wave pipe from the updated wave pipes.

4. The method of claim 1, wherein, The pipeline arrangement of the wave pipe comprises non-circumferential, horizontal circumferential, circumferential upward, circumferential downward, and U-shaped arrangement. The candidate wave pipe model refers to a virtual model obtained by model simulation of the candidate wave pipe in a specific manner. The device comprises: an arrangement obtaining module configured to obtain the pipeline arrangement of each of the plurality of candidate wave pipes; 5. The method of claim 1, wherein, a wave pipe model determining module configured to, for each of the candidate wave pipes, determine a candidate wave pipe model matching the pipeline arrangement of the candidate wave pipe; a thermal stratification analysis module comprising: ​ ​ ​ 6. The method of claim 1, wherein, ​ 7. The method of claim 1, wherein, ​ 8. A fluctuating tube analysis device, characterized by ​ ​ ​ ​ The model splitting unit is configured to split the candidate wave pipe model to obtain a plurality of candidate wave pipe sub-models. The temperature difference determination unit is configured to, for each candidate wave pipe sub-model, determine a pipe temperature difference between a top pipe and a bottom pipe in the candidate wave pipe sub-model when the candidate wave pipe model is in a simulation running stage. The thermal stratification effect determination unit is configured to determine a thermal stratification effect of the candidate wave pipe based on the pipe temperature differences. The stress analysis module includes: The stress nephogram determination unit is configured to perform stress analysis on the candidate wave pipe based on the candidate wave pipe model to determine a stress nephogram corresponding to the candidate wave pipe model. The stress effect determination unit is configured to determine a stress effect of the candidate wave pipe based on stress distribution in the stress nephogram. The performance analysis module is configured to perform performance analysis on each wave pipe based on the thermal stratification effects and the stress effects to determine a selected wave pipe from the candidate wave pipes.

9. The wave tube analysis device of claim 8, wherein, The thermal stratification effect determination unit is specifically configured to: For each candidate wave pipe sub-model, obtain pipe arrangement data corresponding to the candidate wave pipe sub-model. Perform data analysis based on the pipe arrangement data and the pipe temperature differences to determine a thermal stratification degree of the candidate wave pipe sub-model. Determine the thermal stratification effect of the candidate wave pipe based on the thermal stratification degrees.

10. The wave tube analysis device of claim 8, wherein, The stress effect determination unit is specifically configured to: Perform cross-section cutting on a node with maximum stress in the stress nephogram to obtain a cross-section nephogram corresponding to the node. Perform stress analysis on the cross-section nephogram to determine a stress value corresponding to the node. Determine the stress effect of the candidate wave pipe based on a value of the stress value.

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