CN111814370A - Finite element calculation method for adjusting-stage blade - Google Patents
Finite element calculation method for adjusting-stage blade Download PDFInfo
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Abstract
A finite element calculation method for a regulating blade relates to a finite element calculation method, in particular to a finite element calculation method for a regulating blade. The invention aims to solve the problems that the temperature of the blade of the turbine adjusting stage is high, the profit is high, the working condition is severe, and finite element check needs to be carried out on the strength of the adjusting stage in order to ensure the safe operation of the adjusting stage. The method comprises the following steps: step one, establishing a solid model in modeling software UG according to a drawing; step two, importing the entity model established in the step one into grid software ANSA (ANSA) to draw grids, adopting a volume grid with a hexahedron as a main part, and using a small amount of pentahedron grids in non-key areas; and step three, importing the grid drawn in the step two into finite element calculation software ABAQUS for finite element setting calculation, and defining three-dimensional blade material data, operation conditions, contact boundaries and load setting according to requirements. The invention belongs to the technical field of steam turbines.
Description
Technical Field
The invention relates to a finite element calculation method, in particular to a finite element calculation method for a regulating stage blade, and belongs to the technical field of steam turbines.
Background
The temperature of the turbine regulating stage blade is high, the stress is large, the working condition is severe, and the safety is very critical. In order to ensure the safe operation of the regulating stage, it is important to perform finite element check on the strength of the regulating stage in the design work.
Disclosure of Invention
The invention provides a finite element calculation method for a regulating stage blade, which aims to solve the problems that the temperature of the regulating stage blade of a steam turbine is high, the profit is high, the working condition is severe, and finite element check needs to be carried out on the strength of the regulating stage blade in order to ensure the safe operation of the regulating stage.
The technical scheme adopted by the invention for solving the problems is as follows: the method comprises the following specific steps:
step one, establishing a solid model in modeling software UG according to a drawing;
step two, importing the entity model established in the step one into grid software ANSA (ANSA) to draw grids, adopting a volume grid with a hexahedron as a main part, and using a small amount of pentahedron grids in non-key areas;
and step three, importing the grid drawn in the step two into finite element calculation software ABAQUS for finite element setting calculation, and defining three-dimensional blade material data, operation conditions, contact boundaries and load setting according to requirements.
Further, in the third step, three-dimensional blade material data and operation conditions are defined according to requirements, and the specific steps of defining the relevant settings of the three-dimensional blades are as follows:
step a, defining material data of a three-dimensional blade on a finite element grid computing model, and assigning the defined material to a corresponding assembly body after detection;
b, defining a three-dimensional blade surface set, a node set, a unit set and a load analysis field which are required by pretreatment in a finite element grid computing model;
step c, defining the operation condition of the three-dimensional blade;
d, positioning the related arrangement of the three-dimensional blade;
and e, submitting a calculation result obtained by finite element calculation.
Further, the material data for positioning the three-dimensional blade in the step a comprises the densities of the three-dimensional blade, the rim and the pin material at different temperatures; linear expansion coefficients of the three-dimensional blade, the wheel rim and the pin material at different temperatures; modulus of elasticity of three-dimensional blade, rim and pin materials at different temperatures.
And further, in the step b, the three-dimensional surface set comprises a contact surface between the self-band shroud of the blade and the riveting shroud, a contact surface between the rivet and the riveting shroud, a contact surface between the blade root and the rotor, a contact surface between the blade root and the pin, and a contact surface between the rotor and the pin.
Further, in the step b, the node set comprises nodes for axial and circumferential constraint of the end surface of one side of the wheel groove, nodes for axial constraint of the end surface of the other side of the wheel groove, nodes for radial constraint of the center of the rotor, nodes for axial constraint of the pin on the end surface of the air inlet side, and all model nodes for loading heat load.
Further, the unit set in step b refers to all model units for loading centrifugal force.
Further, the condition of the three-dimensional blade defined in step c includes the centrifugal force intensity of the blade root and the blade.
Further, the step d of defining the related setting of the three-dimensional blade means defining blade root and blade contact setting, defining blade root and blade displacement constraint setting, defining blade root and blade load setting, and defining blade temperature setting, wherein the defining of the blade root and blade contact setting comprises setting contact and friction coefficients between a self-band shroud and a riveting shroud of the blade, setting contact and friction coefficients between a rivet and the riveting shroud, setting contact and friction coefficients between a blade root and a rotor, setting contact and friction coefficients between the blade root and a pin, and setting contact and friction coefficients between the rotor and the pin; defining the displacement constraint arrangement of the blade root and the blade, including the radial constraint of the center of the rotor, the axial constraint and the circumferential constraint of the wheel rim, and the axial constraint of the air inlet side end face of the axial constraint pin on the other side of the wheel rim; defining a root blade load setting comprising a blade centrifugal force load; defining the blade temperature setting includes three-dimensional blade operating temperature.
The invention has the beneficial effects that: the invention can realize finite element check on the safety of the regulating blade; finite element software ABAQUS is used for analyzing the strength of the regulating-stage blade device under a certain rotating speed, and Mises stress and contact stress results of the regulating-stage blade, the riveting shroud ring, the rotor and the pin can be obtained; the method can obtain the dangerous areas and the maximum stress of the blades, the wheel grooves, the shroud band and the pin device which are relatively accurate, and the dangerous areas and the maximum stress are used as important guidance for the safety of the regulating-stage blades of the steam turbine.
Drawings
FIG. 1 is a structural view of a finite element computational model of a turbine stage blade;
FIG. 2 is a schematic view of a regulating stage vane configuration;
FIG. 3 is a schematic view of a rim structure of a conditioning stage blade;
FIG. 4 is a schematic view of the structure of the pin on the regulation stage blade;
in fig. 1: 1. a shroud band, 2, a blade profile, 3, an intermediate body, 4, a blade root, 5, a pin, 6 and a wheel rim;
in fig. 2: 2. a blade root and rim contact surface;
in fig. 3: 8. the end face of the wheel rim.
Detailed Description
The first embodiment is as follows: the present embodiment is described with reference to fig. 1 to 4, and the finite element calculation method of the regulation stage blade according to the present embodiment is implemented by the following steps:
step one, establishing a solid model in modeling software UG according to a drawing;
step two, importing the entity model established in the step one into grid software ANSA (ANSA) to draw grids, adopting a volume grid with a hexahedron as a main part, and using a small amount of pentahedron grids in non-key areas;
and step three, importing the grid drawn in the step two into finite element calculation software ABAQUS for finite element setting calculation, and defining three-dimensional blade material data, operation conditions, contact boundaries and load setting according to requirements.
In this embodiment mode
The second embodiment is as follows: the present embodiment is described with reference to fig. 1 to 4, and in step three of the finite element calculation method for a regulation stage blade according to the present embodiment, three-dimensional blade material data and operation conditions are defined as required, and specific steps of defining relevant settings of the three-dimensional blade are as follows:
step a, defining material data of a three-dimensional blade on a finite element grid computing model, and assigning the defined material to a corresponding assembly body after detection;
b, defining a three-dimensional blade surface set, a node set, a unit set and a load analysis field which are required by pretreatment in a finite element grid computing model;
step c, defining the operation condition of the three-dimensional blade;
d, positioning the related arrangement of the three-dimensional blade;
and e, submitting a calculation result obtained by finite element calculation.
The third concrete implementation mode: referring to fig. 1 to 4, the present embodiment will be described, wherein the material data for positioning the three-dimensional blade in step a of the finite element calculation method for the regulation stage blade in the present embodiment comprises the densities of the three-dimensional blade, the rim and the pin material at different temperatures; linear expansion coefficients of the three-dimensional blade, the wheel rim and the pin material at different temperatures; modulus of elasticity of three-dimensional blade, rim and pin materials at different temperatures.
The fourth concrete implementation mode: the present embodiment is described with reference to fig. 1 to 4, and the three-dimensional surface set in step b of the finite element calculation method for a blade of an adjustment stage according to the present embodiment includes a contact surface between a self-band shroud and a riveting shroud of the blade, a contact surface between a rivet and a riveting shroud, a contact surface between a blade root and a rotor, a contact surface between a blade root and a pin, and a contact surface between a rotor and a pin.
The fifth concrete implementation mode: the present embodiment is described with reference to fig. 1 to 4, and in step b of the finite element calculation method for a regulation stage blade according to the present embodiment, the node set includes a node for axially and circumferentially constraining an end surface on one side of a wheel groove, a node for axially constraining an end surface on the other side of the wheel groove, a node for radially constraining a center of a rotor, a node for axially constraining an end surface on an air inlet side by a pin, and all model nodes for loading a thermal load.
The sixth specific implementation mode: the present embodiment is described with reference to fig. 1 to 4, and the element set in step b of the finite element calculation method for a regulation stage blade according to the present embodiment refers to all model elements for loading centrifugal force.
The seventh embodiment: referring to fig. 1 to 4, the present embodiment is described, and the working condition of the three-dimensional blade defined in step c of the finite element calculation method for a regulation stage blade according to the present embodiment includes the centrifugal force intensity of the blade root and the blade.
The specific implementation mode is eight: the embodiment is described with reference to fig. 1 to 4, and the defining of the relevant settings of the three-dimensional blade in step d of the finite element calculation method for the blade of the adjustment stage according to the embodiment refers to defining blade root and blade contact settings, defining blade root and blade displacement constraint settings, defining blade root and blade load settings, and defining blade temperature settings, where the defining of the blade root and blade contact settings includes setting contact and friction coefficients between a self-band shroud and a riveting shroud of the blade, setting contact and friction coefficients between a rivet and a riveting shroud, setting contact and friction coefficients between a blade root and a rotor, setting contact and friction coefficients between a blade root and a pin, and setting contact and friction coefficients between a rotor and a pin; defining the displacement constraint arrangement of the blade root and the blade, including the radial constraint of the center of the rotor, the axial constraint and the circumferential constraint of the wheel rim, and the axial constraint of the air inlet side end face of the axial constraint pin on the other side of the wheel rim; defining a root blade load setting comprising a blade centrifugal force load; defining the blade temperature setting includes three-dimensional blade operating temperature.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A finite element calculation method for a regulation-stage blade is characterized by comprising the following steps: the finite element calculation method of the regulating-stage blade is realized by the following steps:
step one, establishing a solid model in modeling software UG according to a drawing;
step two, importing the entity model established in the step one into grid software ANSA (ANSA) to draw grids, adopting a volume grid with a hexahedron as a main part, and using a small amount of pentahedron grids in non-key areas;
and step three, importing the grid drawn in the step two into finite element calculation software ABAQUS for finite element setting calculation, and defining three-dimensional blade material data, operation conditions, contact boundaries and load setting according to requirements.
2. A method of finite element computation of a regulation stage blade according to claim 1, wherein: in the third step, three-dimensional blade material data and operation conditions are defined according to requirements, and the specific steps of defining the relevant settings of the three-dimensional blades are as follows:
step a, defining material data of a three-dimensional blade on a finite element grid computing model, and assigning the defined material to a corresponding assembly body after detection;
b, defining a three-dimensional blade surface set, a node set, a unit set and a load analysis field which are required by pretreatment in a finite element grid computing model;
step c, defining the operation condition of the three-dimensional blade;
d, positioning the related arrangement of the three-dimensional blade;
and e, submitting a calculation result obtained by finite element calculation.
3. A method of finite element computation of a vane of a regulation stage according to claim 2, wherein: the material data for positioning the three-dimensional blade in the step a comprises the densities of the three-dimensional blade, the wheel rim and the pin material at different temperatures; linear expansion coefficients of the three-dimensional blade, the wheel rim and the pin material at different temperatures; modulus of elasticity of three-dimensional blade, rim and pin materials at different temperatures.
4. A method of finite element computation of a vane of a regulation stage according to claim 2, wherein: the three-dimensional surface set in the step b comprises a contact surface between the self-band shroud of the blade and the riveting shroud, a contact surface between the rivet and the riveting shroud, a contact surface between the blade root and the rotor, a contact surface between the blade root and the pin and a contact surface between the rotor and the pin.
5. A method of finite element computation of a vane of a regulation stage according to claim 2, wherein: and in the step b, the node set comprises nodes for axial and circumferential constraint of the end surface at one side of the wheel groove, nodes for axial constraint of the end surface at the other side of the wheel groove, nodes for radial constraint of the center of the rotor, axial constraint nodes of the end surface at the air inlet side by pins and all model nodes for loading heat load.
6. A method of finite element computation of a vane of a regulation stage according to claim 2, wherein: the collection of cells in step b refers to all model cells used for loading centrifugal force.
7. A method of finite element computation of a vane of a regulation stage according to claim 2, wherein: and c, defining the working condition of the three-dimensional blade in the step c to comprise the centrifugal force intensity of the blade root and the blade.
8. A method of finite element computation of a vane of a regulation stage according to claim 2, wherein: defining related settings of the three-dimensional blade in the step d refers to defining blade root and blade contact setting, defining blade root and blade displacement constraint setting, defining blade root and blade load setting and defining blade temperature setting, wherein the defining blade root and blade contact setting comprises setting contact and friction coefficients between a self-band shroud and a riveting shroud of the blade, setting contact and friction coefficients between a rivet and the riveting shroud, setting contact and friction coefficients between the blade root and a rotor, setting contact and friction coefficients between the blade root and a pin, and setting contact and friction coefficients between the rotor and the pin; defining the displacement constraint arrangement of the blade root and the blade, including the radial constraint of the center of the rotor, the axial constraint and the circumferential constraint of the wheel rim, and the axial constraint of the air inlet side end face of the axial constraint pin on the other side of the wheel rim; defining a root blade load setting comprising a blade centrifugal force load; defining the blade temperature setting includes three-dimensional blade operating temperature.
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| CN113297765A (en) * | 2021-05-25 | 2021-08-24 | 哈尔滨汽轮机厂有限责任公司 | Thermal stress finite element calculation method for turbine blade |
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