CN111680378A - ANSYS-based heat exchanger tube bundle modal analysis method in liquid filling state - Google Patents
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Abstract
A heat exchanger tube bundle modal analysis method in a liquid filling state based on ANSYS relates to the technical field of design simulation analysis methods of heat exchangers in industry. The invention has solved the influence of the natural frequency to the heat exchange in the design process of the existing heat exchanger, easy technical matter of the failure accident of heat exchanger caused by fluid induced heat exchange tube vibration, the invention carries on the three-dimensional modeling operation to the heat exchange tube bundle and shell model of the heat exchanger model with the help of SOLIDWORKS, and introduce into ANSYS WORKBENCH software to define the attribute of the material used in the structure of the heat exchanger; carrying out grid division on the three-dimensional simulation model, carrying out simulation operation on a CFX (computational fluid dynamics) calculation module in the WORKBENCH software to obtain the temperature and pressure distribution characteristics of the heat-conducting oil, inputting solving setting in ANSYS WORKBENCH software, and setting a frequency extraction order and a solving frequency range; the influence of liquid on the natural frequency and the vibration mode of the structure is analyzed, the influence of a liquid-filled medium and temperature on the modal characteristics of the heat exchange tube bundle structure is analyzed, and an important dynamic basis is provided for preventing the resonance of the structure.
Description
Technical Field
The invention relates to the technical field of design simulation analysis methods of industrial heat exchangers.
Background
The heat exchanger is an industrial device capable of transferring energy among various fluids, and is widely applied to the engineering fields of electric power, traffic, petroleum, metallurgy, nuclear power, air conditioning refrigeration and the like. In the actual operation of the heat exchanger, the influence of the fluid on the heat exchanger is mainly longitudinal excitation and transverse scouring. In practice, the vibration conditions are complex, including steady vibration of the fluid, transient vibration, and resonance of the individual workpieces, which can excite the heat exchanger. The calculation of the natural frequency is crucial to the study of the flow-induced vibration of the heat exchanger, but in the design process of the heat exchanger, the system study on the natural frequency is not carried out at present, focusing on how to improve the mass and heat transfer efficiency; in addition, the vibration failure problem which may be generated in the actual production process and the unequal frequency tube array phenomenon caused by the vibration failure problem are not sufficiently valued. In the inflow and outflow places of the heat exchange tube, because of the instability of local flow velocity, high flow velocity exists in some places, thereby causing vibration; the natural frequency is lower in the tube plate area due to the lack of support of the heat exchange tubes and the greater length of this section relative to the baffle area, plus the faster velocity of this portion of the fluid. The resonance damage of the part is easier to generate under the action of double factors; any obstructions between the heat exchange tube fluids will create local high velocities and this area will also be susceptible to resonance damage. Components in the heat exchanger such as baffles (rod baffles), the shell, the distance rods, and the heat exchange tubes vibrate at a specific frequency and shape. The natural frequency of the heat exchange tube is relatively low, vibration is easy to occur under the fluid flushing, and the heat exchange tube belongs to a structure which is easy to generate dangerous working conditions in a heat exchanger.
The modal analysis is used for determining the vibration characteristics of a structure or a machine part in design, and the natural frequency and the main vibration mode of the structure can be searched through the modal analysis, so that the vibration characteristics of the structure can be known, the vibration can be better utilized or reduced, and therefore, the natural frequency and the vibration mode of the structure need to be known, and certain basis is provided for preventing the resonance damage and the vibration fatigue of the structure, evaluating the dynamic characteristics of the structure and optimizing the design of the structure. The impeller mode is divided into a dry mode and a wet mode. The dry mode refers to the mode of the heat exchanger in air, the wet mode refers to the mode of the heat exchanger in a fluid medium, and the wet mode mainly considers the influence of additional fluid on the vibration characteristic of the structure and the action of a solid structure on the fluid, so that the dry mode is a strong fluid-solid coupling problem. Due to the additional mass of the fluid mass, the wet mode behavior is significantly different from the dry mode behavior, e.g., mode parameters such as frequency. However, the heat exchanger actually works in a heat conduction oil environment, and in order to study vibration under actual operation conditions, the wet mode characteristic of the heat exchanger needs to be considered, so that the wet mode can really represent the dynamic characteristic of a heat exchanger system working in the heat conduction oil environment. The natural frequencies in air and in the fluid medium environment can be represented by the following equations (1), (2):
in the formula: f. ofa、fwRespectively representing natural frequencies in a dry mode and a wet mode; k represents the modal stiffness; m is the modal mass; maAs an additional mass. It can be seen from the equations (1) and (2) that the additional mass M of the fluid medium is due toaThe wet modal frequency is lower than in air. When calculating the wet mode of the heat exchanger, the method is based on solving the structural dynamics equation, and simultaneously, in order to reflect the influence of the fluid on the structure, the fluid is used for solving the equationThe mass is added to the total mass matrix as shown in equation (3):
in the formula: msA quality matrix that is a structure; maIs a mass matrix of the fluid; c is a damping matrix;
is the acceleration vector of the structure,
Is a velocity vector and R is a displacement vector.
In summary, the damping ratio of the impeller material and the aerodynamic damping ratio are researched more, and a plurality of corresponding research results exist. However, the damping ratio of the heat exchanger in the fluid medium environment, namely the damping ratio of the fluid medium, is less researched, and most of the damping ratios of the materials are experimental researches, so that the corresponding numerical researches are less. The heat exchanger unsteady analysis, the pressure pulsation analysis and other related researches are more and relatively comprehensive, but most of the researches only analyze the pressure amplitude in the frequency domain and do not consider the pressure load phase information. Meanwhile, the dynamic analysis based on the dry mode of the heat exchanger is more, and the dynamic analysis of the heat exchanger considering the environmental influence of the surrounding fluid medium is less. The method has the advantages that the wet modal parameters of the heat exchanger and the damping ratio of the fluid medium of the heat exchanger are accurately calculated, and the accurate analysis of the pressure load information of the heat exchanger is very critical for calculating the dynamic stress of the heat exchanger in the fluid medium.
Disclosure of Invention
In summary, the invention aims to solve the technical problems that in the design process of the existing heat exchanger, the influence of natural frequency on heat exchange is neglected while the mass transfer and heat transfer efficiency is improved, and the failure accident of the heat exchanger is easily caused by the vibration of a heat exchange tube induced by fluid, and provides a heat exchanger tube bundle mode analysis method in a liquid filling state based on ANSYS.
In order to solve the technical problems provided by the invention, the technical scheme is as follows:
a heat exchanger tube bundle modal analysis method in a liquid filling state based on ANSYS is characterized by comprising the following steps:
(1) simplifying a heat exchanger model in engineering use, carrying out three-dimensional modeling operation on a heat exchange tube bundle and a shell model of the heat exchanger model by means of three-dimensional modeling software SOLIDWORKS, respectively carrying out geometric modeling on a fluid calculation domain and a heat exchanger solid structure calculation domain in the same coordinate space, establishing a fluid-filled state fluid-solid coupling model of the heat exchange tube bundle, and respectively exporting and storing the fluid calculation domain and the heat exchanger solid structure calculation domain as a.x _ t format file;
(2) importing the x _ t format file exported in the step (1) into ANSYS WORKBENCH software, and defining the attribute of the material used by the heat exchanger structure in the Engineer Data item according to the material characteristics of the actual engineering;
(3) transferring the fluid calculation domain model and the heat exchanger solid structure calculation domain model established in the step (2) into a Mesh module for Mesh division, carrying out Mesh division on the three-dimensional simulation model in the Mesh module, carrying out Mesh encryption on the part close to the tube bundle wall surface in order to ensure the accuracy of a flow field calculation result, ensuring that the Mesh quality of the whole structure is more than 0.4, and defining the names of the inlet and the outlet of all the three-dimensional simulation models and the wall surface boundary in order to set calculation conditions in the later period;
(4) transmitting the three-dimensional simulation model divided by the grids in the step (3) to a CFX (computational fluid dynamics) calculation module, a Static-structural and a Modal calculation module of a WORKBENCH (factory building software), setting a heat transfer model and a turbulent flow model in a Domain option in the CFX module, setting a calculation medium Material as heat conduction oil, and setting an inlet speed value, an outlet pressure value and a wall surface condition in a Boundary detail option;
(5) carrying out simulation operation on a CFX calculation module in WORKBENCH software to obtain the temperature and pressure distribution characteristics of the heat conduction oil, and transmitting the result to a Pre-Stress option of a Modal module to be used as a prestress condition for Modal analysis; meanwhile, loading the gravity acceleration, the fixed constraint and the displacement constraint through an Insert in a Static-structural module;
(6) inputting solving Settings under Analysis Settings options in a Modal module in ANSYS WORKBENCH software, and setting a frequency extraction order and a solving frequency range;
(7) and (4) extracting the frequency and vibration mode results of each step in the step (6) from the Solution option after the calculation is finished, and taking the frequency and vibration mode results as control of natural frequency in the production process of the heat exchanger, analyzing the influence of parameters of the immersion medium on the modal characteristics of the structure of the heat exchanger, optimally designing the structure and preventing the dynamic basis of the resonance of the structure.
The technical scheme for further limiting the invention comprises the following steps:
the parameters set by the three-dimensional modeling software SOLIDWORKS in the step (1) when the three-dimensional modeling operation is carried out on the heat exchange tube bundle and the shell model of the heat exchanger model comprise: the geometric shapes and the geometric size parameters of the shell pass, the heat exchange tubes and the baffle plates.
In the step (2), the attributes of the material used for defining the heat exchanger structure, which are set in the Engineer Data item, include elastic modulus, density and Poisson's ratio.
In the step (4), the process of setting the CFX calculation module is as follows:
(4.1) compiling new Material characteristics according to physical parameters of heat transfer oil in a Material option, wherein the set parameters comprise: density, molar mass, specific heat capacity, thermal conductivity and dynamic viscosity;
(4.2) in the Buoyancy option, setting the Y-direction Gravity Y digit to be a preset value of 9.81m according to the requirement2(s) X and Z directions are set to 0m2(s), Analysis type option set to Steady;
(4.3) setting Heat Transfer in the Fluid Models option as Thermal Energy, and selecting a k-epsilon model in the Turbulence option;
(4.4) selecting newly-established Material heat conduction oil in the Material Library option part;
(4.5) setting an inlet Boundary condition as Normal Speed and an outlet Boundary condition as Static Pressure in Boundary options, setting the wall surfaces of a tube pass and a shell pass as convection heat exchange surfaces, setting the convection heat exchange coefficient according to an actual calculated value, and setting other wall surfaces as heat insulation smooth wall surfaces;
and (4.6) selecting the Define Run and then calculating.
In the step (5), the process of setting the Static-structural module is as follows: respectively loading gravity acceleration, fixed constraint and displacement constraint in a Static-structural module through Insert options to ensure that a tube bundle can move in the horizontal direction and cannot move in the vertical direction; the shell pass is set with fixed constraint, the whole calculation model is set with gravity acceleration in the direction of-Y, and the prestress and temperature of the heat transfer oil loaded on the heat exchange tube wall are automatically loaded from the outside.
In the step (6), the process of setting the Modal module is as follows:
inputting solving setting under an Analysis Settings option in a Modal module, setting a frequency extraction order and a solving frequency range, setting the frequency extraction order as the first 10 orders and the solving frequency range as 0-160Hz, solving a mode by adopting a Block Lanczos method, and calculating after selecting Solve.
The frequency and mode results of each order in the step (7) comprise: modal shape diagram of the tube bundle.
The invention has the beneficial effects that: the ANSYS-based heat exchanger tube bundle modal analysis method in the liquid filling state can reveal the vibration characteristic of the heat exchanger, provide guidance and suggestions for controlling the natural frequency in the production process of the heat exchanger and reducing the failure accidents of the heat exchanger caused by the vibration of the heat exchange tube induced by fluid, and simultaneously can optimize the structure by simulating the frequency characteristic in the design process and provide reference for the revision of relevant standards and the safety design of the heat exchanger. The liquid filling medium is heat conduction oil, and analysis shows that the frequency of the wet mode analysis is increased by about 15% compared with that of the dry mode in a state of being filled with the heat conduction oil, so that the liquid filling medium can change the rigidity and the damping of the structure and has influence on the inherent frequency of the model. The method has universality for calculating the natural frequency of the liquid filling and soaking structure, can change the property of the liquid filling medium, and obtain more accurate natural frequency and vibration mode of the structure in a working state, thereby providing a certain basis for preventing the resonance damage and the vibration fatigue of the structure, evaluating the dynamic characteristic of the structure and optimizing the structure design.
Drawings
FIG. 1 is a finite element geometric model diagram of a heat exchanger of the present invention including a shell.
FIG. 2 is a finite element geometric model diagram of the heat exchanger without the shell according to the present invention.
FIG. 3 is a state diagram of the heat exchanger model after meshing according to the present invention.
FIG. 4 shows the first order modal frequency mode of the immersion fluid state of the heat exchanger structure of the present invention.
Detailed Description
The structure of the present invention will be further described with reference to the accompanying drawings and preferred embodiments of the present invention.
The invention discloses a heat exchanger tube bundle modal analysis method in a liquid filling state based on ANSYS, which comprises the following steps:
(1) simplifying a heat exchanger model in engineering use, and carrying out three-dimensional modeling operation on a heat exchange tube bundle and a shell model of the heat exchanger model by using three-dimensional modeling software SOLIDWORKS, wherein the structure is shown in FIG. 1 and FIG. 2; respectively carrying out geometric modeling on the fluid calculation domain and the heat exchanger solid structure calculation domain in the same coordinate space, establishing a fluid-filled state fluid-solid coupling model of the heat exchange tube bundle, and respectively exporting and storing the fluid calculation domain and the heat exchanger solid structure calculation domain model as an x _ t format file; the parameters set by the three-dimensional modeling software soilworks when performing the three-dimensional modeling operation on the heat exchange tube bundle and the shell model of the heat exchanger model may specifically include: the geometric shapes and the geometric size parameters of the shell pass, the heat exchange tubes and the baffle plates.
(2) Importing the x _ t format file exported in the step (1) into ANSYS WORKBENCH software, and defining the attribute of the material used by the heat exchanger structure in the Engineer Data item according to the material characteristics of the actual engineering; the properties of the material used to define the heat exchanger structure, which are set in the Engineer Data entry, include in particular the elastic modulus, density and Poisson's ratio properties.
(3) Transferring the fluid calculation domain model and the heat exchanger solid structure calculation domain model established in the step (2) into a Mesh module for Mesh division, carrying out Mesh division on the three-dimensional simulation model in the Mesh module, carrying out Mesh encryption on the part close to the wall surface of the tube bundle in order to ensure the accuracy of a flow field calculation result, and ensuring that the Mesh quality of the whole structure is more than 0.4 in the state shown in figure 3;
(4) transmitting the three-dimensional simulation model divided by the grids in the step (3) to a CFX (computational fluid dynamics) calculation module, a Static-structural and a Modal calculation module of a WORKBENCH (factory building software), setting a heat transfer model and a turbulent flow model in a Domain option in the CFX module, setting a calculation medium Material as heat conduction oil, and setting an inlet speed value, an outlet pressure value and a wall surface condition in a Boundary detail option; the specific process of setting the CFX calculation module is as follows:
(4.1) compiling new Material characteristics according to physical parameters of heat transfer oil in a Material option, wherein the set parameters comprise: density, molar mass, specific heat capacity, thermal conductivity and dynamic viscosity;
(4.2) in the Buoyancy option, setting the Y-direction Gravity Y digit to be a preset value of 9.81m according to the requirement2(s) X and Z directions are set to 0m2(s), Analysis type option set to Steady;
(4.3) setting Heat Transfer in the Fluid Models option as Thermal Energy, and selecting a k-epsilon model in the Turbulence option;
(4.4) selecting newly-established Material heat conduction oil in the Material Library option part;
(4.5) setting an inlet Boundary condition as Normal Speed and an outlet Boundary condition as Static Pressure in Boundary options, setting the wall surfaces of a tube pass and a shell pass as convection heat exchange surfaces, setting the convection heat exchange coefficient according to an actual calculated value, and setting other wall surfaces as heat insulation smooth wall surfaces;
and (4.6) selecting the Define Run and then calculating.
(5) Carrying out simulation operation on a CFX calculation module in WORKBENCH software to obtain the temperature and pressure distribution characteristics of the heat conduction oil, and transmitting the result to a Pre-Stress option of a Modal module to be used as a prestress condition for Modal analysis; meanwhile, loading the gravity acceleration, the fixed constraint and the displacement constraint through an Insert in a Static-structural module; the process of setting the Static-structural module is as follows: respectively loading gravity acceleration, fixed constraint and displacement constraint in a Static-structural module through Insert options to ensure that a tube bundle can move in the horizontal direction and cannot move in the vertical direction; the shell pass is set with fixed constraint, the whole calculation model is set with gravity acceleration in the direction of-Y, and the prestress and temperature of the heat transfer oil loaded on the heat exchange tube wall are automatically loaded from the outside.
(6) Inputting solving Settings under Analysis Settings options in a Modal module in ANSYS WORKBENCH software, and setting a frequency extraction order and a solving frequency range; the process of setting the Modal module is as follows: inputting solving setting under an Analysis Settings option in a Modal module, setting a frequency extraction order and a solving frequency range, setting the frequency extraction order as the first 10 orders and the solving frequency range as 0-160Hz, solving a mode by adopting a Block Lanczos method, and calculating after selecting Solve.
(7) And (4) extracting the frequency and vibration mode results of each step in the step (6) from the Solution option after the calculation is finished, and taking the frequency and vibration mode results as control of natural frequency in the production process of the heat exchanger, analyzing the influence of parameters of the immersion medium on the modal characteristics of the structure of the heat exchanger, optimally designing the structure and preventing the dynamic basis of the resonance of the structure. The order frequency and mode shape results include the mode shape plot of the tube bundle shown in fig. 4.
Because the modal parameters of the heat exchanger in the free state are researched, the first six orders in the analysis result are free modes and tend to be zero, and the modal parameters are not considered. The true modal analysis results are viewed starting from the seventh order. Analysis results show that the vibration modes of all the stages are basically consistent, the working frequency range of the heat exchanger is 0-160Hz, the natural frequency is high, the frequency caused by the fluid medium can be slowly accelerated to the working frequency in the working process, and the vibration frequency passes through the natural frequency (resonance region) in the process and generates vibration with a relatively large amplitude, so that the working frequency of the heat exchanger needs to be avoided from the region as much as possible when the heat exchanger is designed. Analysis results show that the liquid-filled wet mode is the real representation of the dynamic characteristics of the heat exchanger in the working state, and the invention can provide important basis for preventing structural resonance and optimizing structural design.
The invention utilizes ANSYS finite element Analysis software to analyze and research the wet mode of the heat exchange tube bundle structure in a liquid filling state through a Modal module under an Analysis System in a WORKBENCH Analysis platform, analyzes the influence of liquid on the inherent frequency and the vibration mode of the structure, simultaneously considers the state that the heat exchange tube bundle structure is filled with heat conduction oil under the operation condition, analyzes the influence of a liquid filling medium and temperature on the Modal characteristic of the heat exchange tube bundle structure, and provides an important dynamic basis for preventing the resonance of the structure. The method has certain universality on the calculation of the natural frequency of the heat exchange tube bundle structure under the liquid filling, can change the liquid filling medium and the temperature, can obtain the more accurate natural frequency and vibration mode of the structure under the working state, and provides certain basis for preventing the resonance damage and the vibration fatigue of the structure, evaluating the dynamic characteristic of the structure and optimizing the structure design.
The embodiments of the present invention are described only for the preferred embodiments of the present invention, and not for the limitation of the concept and scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall into the protection scope of the present invention, and the technical content of the present invention which is claimed is fully set forth in the claims.
Claims (7)
1. A heat exchanger tube bundle modal analysis method in a liquid filling state based on ANSYS is characterized by comprising the following steps:
(1) simplifying a heat exchanger model in engineering use, carrying out three-dimensional modeling operation on a heat exchange tube bundle and a shell model of the heat exchanger model by means of three-dimensional modeling software SOLIDWORKS, respectively carrying out geometric modeling on a fluid calculation domain and a heat exchanger solid structure calculation domain in the same coordinate space, establishing a fluid-filled state fluid-solid coupling model of the heat exchange tube bundle, and respectively exporting and storing the fluid calculation domain and the heat exchanger solid structure calculation domain as a.x _ t format file;
(2) importing the x _ t format file exported in the step (1) into ANSYS WORKBENCH software, and defining the attribute of the material used by the heat exchanger structure in the EnginerData item according to the material characteristics of the actual engineering;
(3) transferring the fluid calculation domain model and the heat exchanger solid structure calculation domain model established in the step (2) into a Mesh module for Mesh division, carrying out Mesh division on the three-dimensional simulation model in the Mesh module, carrying out Mesh encryption on the part close to the tube bundle wall surface in order to ensure the accuracy of a flow field calculation result, ensuring that the Mesh quality of the whole structure is more than 0.4, and defining the names of the inlet and the outlet of all the three-dimensional simulation models and the wall surface boundary in order to set calculation conditions in the later period;
(4) transmitting the three-dimensional simulation model divided by the grids in the step (3) to a CFX (computational fluid dynamics) calculation module, a Static-structural and a Modal calculation module of a WORKBENCH (factory building software), setting a heat transfer model and a turbulent flow model in a Domain option in the CFX module, setting a calculation medium Material as heat conduction oil, and setting an inlet speed value, an outlet pressure value and a wall surface condition in a Boundary detail option;
(5) carrying out simulation operation on a CFX calculation module in WORKBENCH software to obtain the temperature and pressure distribution characteristics of the heat conduction oil, and transmitting the result to a Pre-Stress option of a Modal module to be used as a prestress condition for Modal analysis; meanwhile, loading the gravity acceleration, the fixed constraint and the displacement constraint through an Insert in a Static-structural module;
(6) inputting solving Settings under Analysis Settings options in a Modal module in ANSYS WORKBENCH software, and setting a frequency extraction order and a solving frequency range;
(7) and (4) extracting the frequency and vibration mode results of each step in the step (6) from the Solution option after the calculation is finished, and taking the frequency and vibration mode results as control of natural frequency in the production process of the heat exchanger, analyzing the influence of parameters of the immersion medium on the structural modal characteristics of the heat exchanger, optimally designing the structure and preventing the dynamic basis of structural resonance.
2. The ANSYS-based method for analyzing the modal shape of the heat exchanger tube bundle in the liquid filling state, according to claim 1, wherein the ANSYS-based method comprises the following steps: the parameters set by the three-dimensional modeling software SOLIDWORKS in the step (1) when the three-dimensional modeling operation is carried out on the heat exchange tube bundle and the shell model of the heat exchanger model comprise: the geometric shapes and the geometric size parameters of the shell pass, the heat exchange tubes and the baffle plates.
3. The ANSYS-based method for analyzing the modal shape of the heat exchanger tube bundle in the liquid filling state, according to claim 1, wherein the ANSYS-based method comprises the following steps: in the step (2), the attributes of the material used for defining the heat exchanger structure, which are set in the Engineer Data item, include elastic modulus, density and Poisson's ratio.
4. The ANSYS-based method for analyzing the modal shape of the heat exchanger tube bundle in the liquid filling state, according to claim 1, wherein the ANSYS-based method comprises the following steps: in the step (4), the process of setting the CFX calculation module is as follows:
(4.1) compiling new Material characteristics according to physical parameters of heat transfer oil in a Material option, wherein the set parameters comprise: density, molar mass, specific heat capacity, thermal conductivity and dynamic viscosity;
(4.2) in the Buoyancy option, setting the Y-direction Gravity Y digit to be a preset value of 9.81m according to the requirement2(s) X and Z directions are set to 0m2(s), Analysis type option set to Steady;
(4.3) setting Heat Transfer in the Fluid Models option as Thermal Energy, and selecting a k-epsilon model in the Turbulence option;
(4.4) selecting newly-established Material heat conduction oil in the Material Library option part;
(4.5) setting an inlet Boundary condition as Normal Speed and an outlet Boundary condition as Static Pressure in Boundary options, setting the wall surfaces of a tube pass and a shell pass as convection heat exchange surfaces, setting the convection heat exchange coefficient according to an actual calculated value, and setting other wall surfaces as heat insulation smooth wall surfaces;
and (4.6) selecting the Define Run and then calculating.
5. The ANSYS-based method for analyzing the modal shape of the heat exchanger tube bundle in the liquid filling state, according to claim 1, wherein the ANSYS-based method comprises the following steps: in the step (5), the process of setting the Static-structural module is as follows: respectively loading gravity acceleration, fixed constraint and displacement constraint in a Static-structural module through Insert options to ensure that a tube bundle can move in the horizontal direction and cannot move in the vertical direction; the shell pass is set with fixed constraint, the whole calculation model is set with gravity acceleration in the direction of-Y, and the prestress and temperature of the heat transfer oil loaded on the heat exchange tube wall are automatically loaded from the outside.
6. The ANSYS-based method for analyzing the modal shape of the heat exchanger tube bundle in the liquid filling state, according to claim 1, wherein the ANSYS-based method comprises the following steps: in the step (6), the process of setting the Modal module is as follows:
inputting solving setting under an Analysis Settings option in a Modal module, setting a frequency extraction order and a solving frequency range, setting the frequency extraction order as the first 10 orders and the solving frequency range as 0-160Hz, solving a mode by adopting a Block Lanczos method, and calculating after selecting Solve.
7. The ANSYS-based method for analyzing the modal shape of the heat exchanger tube bundle in the liquid filling state, according to claim 1, wherein the ANSYS-based method comprises the following steps: the frequency and mode results of each order in the step (7) comprise: modal shape diagram of the tube bundle.
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| CN112446177A (en) * | 2020-11-16 | 2021-03-05 | 天华化工机械及自动化研究设计院有限公司 | Simulation method for heat insulation performance of external heat insulation material of high-temperature carbonization furnace |
| CN112560359A (en) * | 2020-12-09 | 2021-03-26 | 华南理工大学 | Simulation method for heat transfer characteristics of shell-and-tube heat exchanger in scaling state |
| CN112815760A (en) * | 2021-01-04 | 2021-05-18 | 中国神华能源股份有限公司国华电力分公司 | Hypergravity solution boiler for carbon dioxide capture and design method thereof |
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