Impeller blade particle impact fluid-solid-heat dynamic simulation method based on multi-physics field coupling

Abstract

The invention provides a fluid-solid-heat dynamic simulation method for impeller blade particle impact based on multi-physics field coupling, the physics field in the method comprises a fluid field, a heat transfer field and a structure field, coupling simulation is carried out through data exchange among different software, and the process of particle impact on an impeller blade is calculated and analyzed. The method mainly comprises the following steps: importing an impeller model grid file into FLUENT software, setting a turbulence model and the like, setting parameters such as the density and the viscosity parameter of air fluid along with the temperature change, the rotating speed of a fluid domain and the like, and setting the flow speed and the temperature parameter of an air inlet; in EDEM software, parameters such as the material, the number and the particle generation of particles are set; a UDF script is read in the FLUENT software, a coupling switch of the EDEM software is turned on, and bidirectional coupling simulation of data exchange is carried out; and importing the obtained temperature change range into an elastic-plastic thermal coupling material model of LS-DYNA software, and carrying out explicit dynamic simulation by taking the obtained particle movement speed as the initial speed of the particles impacting the impeller.

Description

Technical Field

[0001] The present invention relates to the technical field related to centrifugal compressor impeller blade fault diagnosis, and in particular to a fluid-solid-thermal dynamic simulation method of impeller blade particle impact based on multi-physical field coupling. Background Art

[0002] In the field of fluid machinery, the impeller blades of centrifugal compressors are faced with the problem of particle impact damage under high temperature and high pressure. Traditional simulation methods generally analyze the fluid field, heat transfer field or structural field separately, and cannot accurately describe the fluid-solid-thermal multi-physics field coupling effect when particles impact the impeller blades. In response to the existing problems, this patent proposes a fluid-solid-thermal dynamic simulation method for particle impact on impeller blades based on multi-physics field coupling, constructs a fluid-solid-thermal dynamic coupling simulation framework, performs two-way data transmission through FLUENT and EDEM software, analyzes the temperature change range and the motion state of the particles, and then combines the elastic-plastic thermal coupling material model in LS-DYNA software. The obtained particle motion velocity is used as the initial velocity of the particle impacting the impeller, and explicit dynamic simulation is performed to accurately simulate the particle impact process on the impeller blades. Summary of the Invention

[0003] The purpose of the present invention is to simulate the impeller blade particle impact process by adopting the bidirectional coupled CFD-DEM simulation and LS-DYNA explicit dynamics simulation method, so a fluid-solid-thermal dynamic simulation method of impeller blade particle impact based on multi-physics field coupling is proposed.

[0004] A fluid-solid-thermal dynamic simulation method for particle impact on impeller blades based on multi-physics field coupling, the inventive method comprising the following contents:

[0005] Step (1): for the particle impact impeller blade failure occurring during the operation of the centrifugal compressor equipment, a multi-physics field coupling simulation of the impeller blade particle impact is performed, including the fluid field, the heat transfer field and the structural field; the simulation method mainly includes CFD-DEM coupling simulation and explicit dynamics simulation, wherein the CFD-DEM coupling simulation requires a two-way simulation data exchange between FLUENT software and EDEM software to simulate the motion state of the particles in the flow field of the centrifugal compressor equipment, and the explicit dynamics simulation uses LS-DYNA software to perform a dynamic simulation of the particle impact on the impeller blade; a geometric model of the centrifugal compressor equipment and the fluid domain is established using three-dimensional modeling software to provide a geometric basis for the subsequent numerical simulation of the flow field;

[0006] Step (2): importing the three-dimensional model of the centrifugal compressor equipment and fluid domain constructed in step (1) into ANSYS WORKBENCH software to perform Boolean operations on the model and divide and extract the geometric boundaries; meshing the model in the meshing module, defining the partitioning method, boundary size adjustment, boundary layer expansion, etc., and locally encrypting the mesh at key locations to enhance the ability to capture the area where particles and fluids interact;

[0007] Step (3): importing the meshed model according to step (2) into FLUENT software, setting the turbulence model and energy equation, and setting the material parameters such as density and viscosity of the air fluid to change with temperature; setting the calculation parameters such as the rotation speed and rotation axis coordinates of the fluid domain; setting the parameters such as the air inlet fluid flow rate and temperature of the centrifugal compressor equipment;

[0008] Step (4): Import the boundary model of step (2) into EDEM software, set parameters such as the material, quantity, and shape of the particles, wherein the number of particles includes single particles and particle groups to simulate the impact effect of different numbers of particles on the impeller blades; In addition, it is necessary to define the contact parameters between particles and between particles and the model; Set the particle factory to define information such as the generation position, total number, and generation speed of the particles; Set the impeller speed to be consistent with the speed of the fluid domain;

[0009] Step (5): For all processing operations in steps (3) and (4), the coupling switch is turned on in the EDEM software, the UDF script is read into the FLUENT software, simulation data is exchanged between the two software, and a bidirectional coupling simulation of particle movement in the compressor flow field is performed;

[0010] Step (6): For the LS-DYNA explicit dynamics simulation of step (1), the particle-impeller impact model is imported into the LS-DYNA software and meshing is performed; considering that the material parameters will change with the temperature, an elastic-plastic thermal coupling material model is adopted, and the temperature range obtained by post-processing in the FLUENT software is used as the initial condition for parameter setting; the particle motion velocity obtained by post-processing in the EDEM is used as the initial velocity of the particle impacting the impeller blade; and the calculation file is submitted for impact simulation.

[0011] The core value of systematically analyzing the simulation results lies in breaking through the bottleneck of traditional experimental methods that are difficult to intuitively reveal the failure process of particles impacting impeller blades through multi-physics field coupling technology, and providing support for impeller failure analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1This is a technical flow chart of a fluid-solid-thermal dynamic simulation method for particle impact on impeller blades based on multi-physics field coupling;

[0013] Figure 2 This is a diagram of the centrifugal compressor equipment; DETAILED DESCRIPTION

[0014] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings and implementation examples. However, the scope of protection of the present invention is not limited by the specific implementation methods. Obviously, the implementation examples described are only part of the implementation examples of the present invention, not all of the implementation examples.

[0015] like Figure 1 As shown in FIG, it is a technical flow chart for implementing the method, which specifically includes the following contents:

[0016] like Figure 2 As shown in the figure, it is a diagram of a centrifugal compressor equipment. In the figure, 1 is the impeller, 2 is the volute, 21 is the air inlet, 22 is the air outlet, and 3 is the contour ring. Based on this, a three-dimensional model of the centrifugal compressor equipment is established, and unstructured grid division is used for the area near the impeller 1 to adapt to the complex geometric structure of the equipment and accurately capture the complex flow state of the fluid around the impeller 1.

[0017] Aiming at the particle impact impeller blade failure that occurs during the operation of centrifugal compressor equipment, a multi-physics field coupling simulation of particle impact on impeller blades is carried out, including fluid field, heat transfer field and structural field; the simulation methods mainly include CFD-DEM coupling simulation and explicit dynamics simulation. Among them, CFD-DEM coupling simulation requires two-way simulation data exchange between FLUENT software and EDEM software to simulate the motion state of particles in the flow field of centrifugal compressor equipment, and explicit dynamics simulation uses LS-DYNA software to perform dynamic simulation of particles impacting impeller blades; 3D modeling software is used to establish the geometric model of centrifugal compressor equipment and fluid domain, providing a geometric basis for subsequent numerical simulation of flow field.

[0018] The constructed three-dimensional model of the centrifugal compressor equipment and fluid domain was imported into ANSYS WORKBENCH software to perform Boolean operations on the model and divide and extract the geometric boundaries. The model was meshed in the meshing module, and the partitioning method, boundary size adjustment, and boundary layer expansion were defined. Local mesh encryption was performed on key parts to enhance the ability to capture the area where particles and fluids interact.

[0019] The meshed model is imported into the FLUENT software, the turbulence model and energy equation are set, and the material parameters such as density and viscosity of the air fluid are set to change with temperature; the calculation parameters such as the rotation speed and rotation axis coordinates of the fluid domain are set; and the fluid flow rate, temperature and other parameters of the air inlet 21 of the centrifugal compressor equipment are set.

[0020] Import the boundary model into the EDEM software, set the parameters such as the material, quantity and shape of the particles, where the number of particles includes single particles and particle groups to simulate the impact effect of different numbers of particles on the impeller blades; in addition, it is necessary to define the contact parameters between particles and between particles and the model; after importing the particle information, create a new geometric model (plane, cube or cylinder) to define the location of particle generation, define the "particle factory" and the particle input form (total number or total mass), particle generation speed, etc.

[0021] Turn on the coupling switch in the EDEM software, read the UDF script into the FLUENT software, exchange simulation data between the two software, and perform a bidirectional coupling simulation of particle movement in the compressor flow field.

[0022] The particle-impeller impact model was imported into LS-DYNA software and meshed. Considering that material parameters would change with temperature, an elastic-plastic thermal coupling material model was adopted, and the temperature range obtained by post-processing in FLUENT software was used as the initial condition for parameter setting. The particle motion velocity obtained by post-processing in EDEM was used as the initial velocity of the particle impacting the impeller blades. The calculation file was submitted for impact simulation, and a systematic analysis of the simulation results was conducted.

[0023] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that some local modifications or changes may be made without departing from the principles and essential features of the present invention, all of which fall within the scope of protection of the present invention. Therefore, from all perspectives, the embodiments should be considered as exemplary and non-limiting, and the scope of the present invention is determined by the appended claims. The present invention does not cover parts that are identical to or can be implemented using existing technologies.

Claims

1. A fluid-solid-thermal dynamic simulation method for impeller blade particle impact based on multi-physics field coupling, characterized in that: The method comprises the following steps: Step (1): for the particle impact impeller blade failure occurring during the operation of the centrifugal compressor equipment, a multi-physics field coupling simulation of the impeller blade particle impact is performed, including the fluid field, the heat transfer field and the structural field; the simulation method mainly includes CFD-DEM coupling simulation and explicit dynamics simulation, wherein the CFD-DEM coupling simulation requires a two-way simulation data exchange between FLUENT software and EDEM software to simulate the motion state of the particles in the flow field of the centrifugal compressor equipment, and the explicit dynamics simulation uses LS-DYNA software to perform a dynamic simulation of the particle impact on the impeller blade; a geometric model of the centrifugal compressor equipment and the fluid domain is established using three-dimensional modeling software to provide a geometric basis for the subsequent numerical simulation of the flow field; Step (2): importing the three-dimensional model of the centrifugal compressor equipment and fluid domain constructed in step (1) into ANSYSWORKBENCH software to perform Boolean operations on the model and divide and extract the geometric boundaries; meshing the model in the meshing module, defining the partitioning method, boundary size adjustment, boundary layer expansion, etc., and locally encrypting the mesh at key locations to enhance the ability to capture the area where particles and fluids interact; Step (3): importing the meshed model according to step (2) into FLUENT software, setting the turbulence model and energy equation, and setting the material parameters such as density and viscosity of the air fluid to change with temperature; setting the calculation parameters such as the rotation speed and rotation axis coordinates of the fluid domain; setting the parameters such as the air inlet fluid flow rate and temperature of the centrifugal compressor equipment; Step (4): Import the boundary model of step (2) into EDEM software, set parameters such as the material, quantity, and shape of the particles, wherein the number of particles includes single particles and particle groups to simulate the impact effect of different numbers of particles on the impeller blades; In addition, it is necessary to define the contact parameters between particles and between particles and the model; Set the particle factory to define information such as the generation position, total number, and generation speed of the particles; Set the impeller speed to be consistent with the speed of the fluid domain; Step (5): For all processing operations in steps (3) and (4), the coupling switch is turned on in the EDEM software, the UDF script is read into the FLUENT software, simulation data is exchanged between the two software, and a bidirectional coupling simulation of particle movement in the compressor flow field is performed; Step (6): For the LS-DYNA explicit dynamics simulation of step (1), the particle-impeller impact model is imported into the LS-DYNA software and meshing is performed; considering that the material parameters will change with the temperature, an elastic-plastic thermal coupling material model is adopted, and the temperature range obtained by post-processing in the FLUENT software is used as the initial condition for parameter setting; the particle movement speed obtained by post-processing in the EDEM is used as the initial speed of the particle impacting the impeller blade; the calculation file is submitted for impact simulation, and a systematic analysis is performed on the simulation results.

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