CN109033546B - CFD-based valve heat transfer simulation method - Google Patents
CFD-based valve heat transfer simulation method Download PDFInfo
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- CN109033546B CN109033546B CN201810719374.7A CN201810719374A CN109033546B CN 109033546 B CN109033546 B CN 109033546B CN 201810719374 A CN201810719374 A CN 201810719374A CN 109033546 B CN109033546 B CN 109033546B
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- 238000004088 simulation Methods 0.000 title claims abstract description 19
- 238000012546 transfer Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000012530 fluid Substances 0.000 claims abstract description 10
- 238000007781 pre-processing Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 8
- 239000000945 filler Substances 0.000 claims description 8
- 238000012805 post-processing Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
Abstract
The invention provides a valve heat transfer simulation method based on CFD, which comprises the following steps: step 1, establishing a three-dimensional model of a valve; step 2, preprocessing the three-dimensional model of the valve; and step 3, solving according to the pretreatment result. The invention fully considers the convection heat exchange of fluid flow and valve internal parts, the heat conduction of solid parts and the convection heat exchange of parts and air, is basically consistent with the actual working condition, and shows the accuracy.
Description
Technical Field
The invention relates to the field of valves, in particular to a CFD-based valve heat transfer simulation method.
Background
For a valve used in high-temperature and low-temperature working conditions, firstly, the temperature of the filler is considered, and the sealing performance of the filler is influenced by the fact that the temperature is too high or too low; secondly, the overall temperature distribution condition of the valve is considered, so that the phenomenon that the instruments around the valve cannot work normally due to the influence of temperature is avoided.
In view of this, it is important to know the temperature distribution of the valve under specific conditions. Currently, the temperature distribution thereof can be measured by means of on-site measurement, which is a relatively accurate way. But this approach is costly and inefficient. Moreover, for the temperature distribution inside the valve, the test tool is not able to make measurements. There is an urgent need for a quick, accurate, and efficient way to solve the temperature measurement problem.
Disclosure of Invention
In view of the above-described drawbacks of the prior art, an object of the present invention is to provide a CFD-based valve heat transfer simulation method.
To achieve the above and other related objects, the present invention provides a CFD-based valve heat transfer simulation method, comprising the steps of: step 1, establishing a three-dimensional model of a valve; step 2, preprocessing the three-dimensional model of the valve; and step 3, solving according to the pretreatment result.
Preferably, the pretreatment comprises:
step 21, establishing a valve medium flow area;
step 22, generating unstructured grids in the flowing areas of valve parts and valve media;
and step 23, generating a grid file according to the unstructured network.
Preferably, the pretreatment further comprises: removing relatively fine features in the model, such as rounding and chamfering; and parts with less influence on heat transfer, such as screws and nuts, are removed.
Preferably, the step 3 includes the following substeps:
selecting a turbulence model related to medium flow;
setting the material properties and the medium material properties of all parts of the valve;
setting a boundary condition of valve medium flow, an inlet pressure boundary condition or a speed boundary condition and an outlet pressure boundary condition; setting a surface contacted with air as a convection heat exchange surface;
and (5) performing simulation calculation until the residual curve is stably converged, and ending the calculation.
Preferably, the method further comprises step 4. Post-processing is performed according to the result of the solving.
Preferably, the post-treatment comprises:
a velocity vector diagram of the fluid medium is displayed to view the medium flow conditions.
Preferably, the post-processing further comprises: displaying the temperature distribution cloud pictures of all parts and mediums on the symmetrical plane, and checking the specific temperature distribution of each position.
Preferably, the post-processing further comprises: the cloud of temperature distribution at the filler is shown separately.
As described above, the CFD-based valve heat transfer simulation method has the following beneficial effects:
1. the fluid flow and the convection heat exchange of the valve internal parts, the heat conduction of the solid parts and the convection heat exchange of the parts and the air are fully considered, and the accuracy is basically consistent with the actual working condition.
2. The operation software is used for realizing the reappearance of the field working condition, guiding the valve design and reflecting the rapidness and the high efficiency.
3. Through numerical simulation, the actual temperature distribution cloud picture of each part of the valve can be clearly seen and is more visual.
4. Different boundary conditions can be added for different working conditions, various complex working conditions can be simulated, and the practicability is wider.
Drawings
FIG. 1 is a three-dimensional semi-sectional model of a valve;
FIG. 2 is a residual plot;
FIG. 3 is a three-dimensional model of a valve;
FIG. 4 is a vector diagram of the medium flow inside the valve;
FIG. 5 is a cloud plot of temperature distribution for a valve heat transfer simulation;
FIG. 6 is a graph showing the temperature profile of a valve graphite packing;
FIG. 7 is a flow chart of a heat transfer simulation;
FIG. 8 is a naming chart of the valve faces.
The heat exchange device comprises a convection heat exchange surface 1, an inlet 2, a symmetry plane 3, an outlet 4, a medium circulation area 5, a valve body 6, an upper valve cover 7, a filler 8, a support 9, a lower membrane cover 10 and an upper membrane cover 11.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
The invention provides a valve heat transfer simulation method based on CFD, which specifically comprises the following steps:
and 1, establishing a three-dimensional model of the valve.
Specifically, the valve center is taken as an origin, and a complete three-dimensional assembly model of the valve is established.
And 2, preprocessing the three-dimensional model of the valve. Because the three-dimensional model of the valve is a symmetrical model, half of the model is adopted for simulation.
Specifically, step 2 comprises the following sub-steps:
a. and selecting a Fluid Flow (Fluent) module under an ANSYS workbench, and establishing a valve medium Flow area in the DM so as to simulate the medium Flow.
b. The relatively small features of the model, such as rounding and chamfering, are removed, and parts which have less influence on heat transfer, such as partial screws, nuts and the like, are removed.
c. The valve parts and the flowing area of the valve medium are both generated into unstructured grids, and the boundary surface is named as an inlet 2, an outlet 4 (the surface opposite to the inlet), a symmetrical surface 3 and a convection heat exchange surface 1 so as to be distinguished in Fluent, as shown in fig. 8.
d. A grid file suitable for Fluent computation is exported.
And step 3, solving according to the pretreatment result.
According to the basic equation of flow
Mass conservation equation:
momentum conservation equation:
energy conservation equation:
wherein ρ represents density, T represents time, div represents divergence, u represents velocity vector, u represents velocity in x direction, v represents velocity in y direction, w represents velocity in z direction, μ represents dynamic viscosity, grad represents gradient, T represents temperature, P represents pressure on fluid microelements, S u 、S v 、S w Generalized source term representing conservation of momentum equation, k representing heat transfer coefficient of fluid, c representing specific heat capacity, S T Represents the internal heat source of the fluid and the portion of the fluid that converts mechanical energy into thermal energy due to viscous effects.
Numerical simulation calculation is carried out in fluent, so that the distribution condition of basic physical quantities (speed, pressure, temperature, concentration and the like) at various positions in a flow field of a complex problem can be obtained, and the specific operation is as follows:
a. and opening Fluent software, and importing the grid file generated before.
b. A correct turbulence model is selected in relation to the medium flow.
c. The material properties of each part of the valve, including density, specific heat, heat conduction coefficient and the like, are correctly set, so that the accuracy of heat transfer of the solid material is ensured; and the medium material properties including density, specific heat, heat conduction coefficient, dynamic viscosity and the like are set, so that the accuracy of the flowing state of the medium material is ensured.
d. The material previously set is assigned to each component and medium.
e. Setting boundary conditions of valve medium flow, setting pressure boundary conditions or speed boundary conditions of an inlet, setting pressure boundary conditions of an outlet, setting a surface contacted with air as a convection heat exchange surface, and filling in a convection heat exchange coefficient.
f. And (5) performing simulation calculation until the residual curve is stably converged, and ending the calculation. As shown in fig. 2, the residual curves include a Continuity residual curve Continuity, a velocity residual curve (X-velocity, Y-velocity, Z-velocity), an energy residual curve energy, k residual, omega or epsilon residual curves, all of which are basically converged, and the calculation ends.
And 4, performing post-processing according to the solving result.
a. A velocity vector diagram of the fluid medium is displayed to view the medium flow conditions.
b. Displaying the temperature distribution cloud pictures of all parts and mediums on the symmetrical plane, and checking the specific temperature distribution of each position.
c. The cloud of temperature distribution at the filler is shown separately.
Step 5, scheme improvement
For the temperature of the filling position, if the temperature is too high, changing the structure of the upper valve cover and increasing the height of the upper valve cover; if the temperature is relatively low, the structure of the upper valve cover is changed, and the height of the upper valve cover is reduced.
In this example, the valve used was DN50Class300, medium: steam, 3Mpa at the front end of the valve, 0.5Mpa at the back of the valve, 300 ℃ of steam temperature, SUS304 as the valve material, graphite as the filler, carbon steel as the bracket and the film cover, and 20W/(m) of convection heat transfer coefficient on site is assumed 2 * k) The simulation results are shown in fig. 4 to 6. From FIGS. 4 to 6, it is possible to obtain a temperature at the filler of 200 ℃.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (3)
1. The valve heat transfer simulation method based on CFD is characterized by comprising the following steps of:
step 1, establishing a three-dimensional model of a valve;
step 2, preprocessing the three-dimensional model of the valve;
step 3, solving according to the pretreatment result;
said step 3 comprises the sub-steps of:
selecting a turbulence model related to medium flow;
setting the material properties and the medium material properties of all parts of the valve;
setting a boundary condition of valve medium flow, an inlet pressure boundary condition or a speed boundary condition and an outlet pressure boundary condition; setting a surface contacted with air as a convection heat exchange surface;
analog calculation is carried out until the residual curve is stably converged and then the calculation is finished; the residual curve includes: a continuity residual curve, a speed residual curve, an energy residual curve energy, a k residual, an Omega or epsilon residual curve;
the method further comprises the step 4 of carrying out post-treatment according to the solving result;
the post-processing includes:
displaying a velocity vector diagram of the fluid medium, and checking the flow condition of the medium;
the post-processing further includes: displaying temperature distribution cloud pictures of all parts and mediums on a symmetrical plane, and checking specific temperature distribution of each position;
the post-processing further includes: the cloud of temperature distribution at the filler is shown separately.
2. The CFD-based valve heat transfer simulation method of claim 1, wherein the preprocessing comprises:
step 21, establishing a valve medium flow area;
step 22, generating unstructured grids in the flowing areas of valve parts and valve media;
and step 23, generating a grid file according to the unstructured network.
3. The CFD-based valve heat transfer simulation method of claim 2, wherein the preprocessing further comprises: removing tiny features in the model, including rounding and chamfering; and parts with less influence on heat transfer, including screws and nuts, are removed.
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| CN201810719374.7A CN109033546B (en) | 2018-07-03 | 2018-07-03 | CFD-based valve heat transfer simulation method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105488292A (en) * | 2015-12-14 | 2016-04-13 | 中广核工程有限公司 | Method and system for evaluating structural performance of high-temperature valve based on valve simulation model |
| CN105550481A (en) * | 2016-01-29 | 2016-05-04 | 中国科学院广州能源研究所 | Optimized design method for flue gas heat exchanger on basis of water gravity heat pipe |
| CN105930585A (en) * | 2016-04-21 | 2016-09-07 | 厦门大学 | CFD-based simulation method for flow field and temperature field of Shell gasifier |
| CN106682346A (en) * | 2017-01-05 | 2017-05-17 | 中南大学 | Method for optimizing complicated member gas-quenching system based on CFD software |
| CN106844898A (en) * | 2016-12-31 | 2017-06-13 | 华晨汽车集团控股有限公司 | The detection method of exhaust manifold thermal fatigue life |
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- 2018-07-03 CN CN201810719374.7A patent/CN109033546B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105488292A (en) * | 2015-12-14 | 2016-04-13 | 中广核工程有限公司 | Method and system for evaluating structural performance of high-temperature valve based on valve simulation model |
| CN105550481A (en) * | 2016-01-29 | 2016-05-04 | 中国科学院广州能源研究所 | Optimized design method for flue gas heat exchanger on basis of water gravity heat pipe |
| CN105930585A (en) * | 2016-04-21 | 2016-09-07 | 厦门大学 | CFD-based simulation method for flow field and temperature field of Shell gasifier |
| CN106844898A (en) * | 2016-12-31 | 2017-06-13 | 华晨汽车集团控股有限公司 | The detection method of exhaust manifold thermal fatigue life |
| CN106682346A (en) * | 2017-01-05 | 2017-05-17 | 中南大学 | Method for optimizing complicated member gas-quenching system based on CFD software |
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