CN108491676B - Heat insulation performance simulation analysis method and system of heat shield - Google Patents
Heat insulation performance simulation analysis method and system of heat shield Download PDFInfo
- Publication number
- CN108491676B CN108491676B CN201810714024.1A CN201810714024A CN108491676B CN 108491676 B CN108491676 B CN 108491676B CN 201810714024 A CN201810714024 A CN 201810714024A CN 108491676 B CN108491676 B CN 108491676B
- Authority
- CN
- China
- Prior art keywords
- heat
- layer
- shield
- heat insulation
- fiber layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Geometry (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Engineering & Computer Science (AREA)
- Evolutionary Computation (AREA)
- Aviation & Aerospace Engineering (AREA)
- Pure & Applied Mathematics (AREA)
- Mathematical Optimization (AREA)
- Mathematical Analysis (AREA)
- Computational Mathematics (AREA)
- Automation & Control Theory (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention discloses a simulation analysis method and a simulation analysis system for heat insulation performance of a heat shield. The method comprises the following steps: establishing a grid model according to the actual geometric dimensions of the heat source and the heat shield; setting simulation parameters of each layer in a network model of the heat shield, wherein the simulation parameters comprise: the heat conduction coefficient of the heat insulation fiber layer along the surface tangential direction of the heat insulation fiber layer and the heat conduction coefficient of the heat insulation fiber layer vertical to the surface direction of the heat insulation fiber layer; setting a heat radiation condition and a convection boundary condition; and according to the heat radiation condition and the convection boundary condition, carrying out heat insulation performance simulation on the heat insulation cover through the network model according to preset simulation model parameters so as to determine the heat insulation performance of the heat insulation cover. The method can truly reflect the influence of different material properties on the heat conduction in each layer of heat insulation material and the influence of different thermal conductivity properties of the heat insulation material on the heat conduction, thereby accurately determining the heat insulation property of the heat insulation cover.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a simulation analysis method for heat insulation performance of a heat shield.
Background
A large amount of high-temperature waste gas is generated in the running process of an automobile engine and is exhausted through an exhaust system of the automobile. Exhaust manifolds and the like are high-temperature heat source components in the engine compartment, and generate a great heat radiation effect on surrounding components of the engine compartment, so that effective heat insulation measures are required before the heat source and the heat-damaged components. Compared with a common single-layer metal material heat shield, the heat shield with a sandwich structure usually adopts a three-layer heat shield structure of metal, heat insulation fibers and metal, and the heat insulation effect is better because the heat insulation fibers in the middle have low heat conduction coefficient and the heat conduction coefficient in the plane direction is larger than that in the normal direction.
In a common simulation method for the heat insulation cover made of the multi-layer materials, the heat conduction coefficient of each heat insulation material is considered to be isotropic, the heat conduction process between the materials of all layers is simplified into a one-dimensional heat conduction process from a high-temperature side to a low-temperature side, and comprehensive material characteristic parameters including the comprehensive heat conduction coefficient, the comprehensive specific heat capacity and the comprehensive material density are calculated through theory. During the modeling process, only the overall geometric outer surface of the heat shield is established and the internal structure is not considered. The problems that exist are that: (1) the influence of different material properties on the heat conduction in each layer of heat insulation material cannot be truly reflected; (2) the influence of the anisotropic nature of the thermal conductivity of the insulation material on the heat conduction cannot be reflected.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art described above.
Therefore, a first object of the present invention is to provide a simulation analysis method for thermal insulation performance of a heat shield. The method can truly reflect the influence of different material properties on the heat conduction in each layer of heat insulation material and the influence of different thermal conductivity properties of the heat insulation material on the heat conduction, so that the heat insulation property of the heat insulation cover can be accurately determined.
Another object of the present invention is to provide a thermal insulation performance simulation analysis system for a thermal shield.
In order to achieve the above object, an embodiment of a first aspect of the present invention discloses a thermal insulation performance simulation analysis method of a thermal insulation cover, the thermal insulation cover comprising: the heat insulation fiber layer comprises a metal outer layer, a metal inner layer and a heat insulation fiber layer arranged between the metal outer layer and the metal inner layer, and the method comprises the following steps: establishing a mesh model based on actual geometric dimensions of the heat source and the heat shield, wherein the network model of the heat shield comprises a network model of each layer of insulation material; setting simulation parameters of each layer in the network model of the heat shield, wherein the simulation parameters comprise: the density, specific heat and heat conduction coefficient of the metal outer layer and the metal inner layer, the density, specific heat and heat conduction coefficient of the heat insulation fiber layer along the surface tangential direction of the heat insulation fiber layer and the heat conduction coefficient of the heat insulation fiber layer vertical to the surface direction; setting a heat radiation condition and a convection boundary condition; and according to the heat radiation condition and the convection boundary condition, carrying out heat insulation performance simulation on the heat insulation cover through the network model according to preset simulation model parameters so as to determine the heat insulation performance of the heat insulation cover.
According to the simulation analysis method for the heat insulation performance of the heat insulation cover, the influence of different material performances on the heat conduction in each layer of heat insulation material can be truly embodied, the influence of different thermal conductivity performances of the heat insulation material on the heat conduction can be truly embodied, and therefore the heat insulation performance of the heat insulation cover can be accurately determined.
In some examples, the network model, comprises: a geometric model of a metal outer layer of the heat shield, a geometric model of a heat-insulating fiber layer of the heat shield, a geometric model of a metal inner layer of the heat shield, and a geometric model of the heat source.
In some examples, the thermal conductivity along the tangential direction of the surface of the insulating fiber layer and the thermal conductivity perpendicular to the surface of the insulating fiber layer are obtained as follows: defining a vector function which is applicable to the surface and represents the normal direction of the surface, enabling the vector direction of the vector function on any grid of the surface to be the normal direction of the surface, enabling the vector direction to point to the direction of heat conduction from high temperature to low temperature, and setting the heat conduction coefficient of the heat insulation fiber layer in the specified direction of the vector function as the heat conduction coefficient of the direction vertical to the surface of the heat insulation fiber layer; defining a vector function which is applicable to the surface and represents the tangential direction of the surface, and enabling the vector direction of the vector function on any grid of the surface to be the tangential direction of the surface; and setting the heat conduction coefficient of the thermal insulation fiber layer in the direction specified by the vector function as the heat conduction coefficient along the tangential direction of the surface of the thermal insulation fiber layer.
In some examples, the setting of the heat radiation condition and the convection boundary condition includes: setting the surface emissivity of each layer for radiation calculation; setting the heat productivity or surface temperature of the heat source and the emissivity of the surface of the heat source; setting convection boundary conditions for a surrounding flow field, including: the inlet and outlet boundary conditions of the domain, the ambient temperature, are calculated.
In some examples, performing a thermal insulation performance simulation of the thermal shield by the network model according to preset simulation model parameters in accordance with the thermal radiation conditions and convection boundary conditions to determine the thermal insulation performance of the thermal shield comprises: the effect of the properties of each layer on the conductive properties of heat within each layer and the effect of the anisotropic nature of the thermal conductivity properties of the insulating fiber layers on heat conduction are determined.
Embodiments of a second aspect of the invention disclose a thermal insulation performance simulation analysis system for a thermal shield, the thermal shield comprising: outer layer of metal, metal inlayer and locate outer layer of metal with thermal-insulated fibrous layer between the metal inlayer, the system includes: a model building module for building a mesh model from actual geometric dimensions of the heat source and the heat shield, wherein the network model of the heat shield comprises a network model of each layer of insulation material; a simulation parameter setting module for setting simulation parameters of each layer in the network model of the heat shield, wherein the simulation parameters include: the density, specific heat and heat conduction coefficient of the metal outer layer and the metal inner layer, the density, specific heat and heat conduction coefficient of the heat insulation fiber layer along the surface tangential direction of the heat insulation fiber layer and the heat conduction coefficient of the heat insulation fiber layer vertical to the surface direction; the condition setting module is used for setting a heat radiation condition and a convection boundary condition; and the simulation module is used for simulating the heat insulation performance of the heat shield through the network model according to the heat radiation condition and the convection boundary condition and preset simulation model parameters so as to determine the heat insulation performance of the heat shield.
According to the simulation analysis system for the heat insulation performance of the heat shield, disclosed by the embodiment of the invention, the influence of different material performances on the heat conduction in each layer of heat insulation material can be truly embodied, and the influence of different thermal conductivity performances of the heat insulation material on the heat conduction can be truly embodied, so that the heat insulation performance of the heat shield can be accurately determined.
In some examples, the network model, comprises: a geometric model of a metal outer layer of the heat shield, a geometric model of a heat-insulating fiber layer of the heat shield, a geometric model of a metal inner layer of the heat shield, and a geometric model of the heat source.
In some examples, the thermal conductivity along the tangential direction of the surface of the insulating fiber layer and the thermal conductivity perpendicular to the surface of the insulating fiber layer are obtained as follows: defining a vector function which is applicable to the surface and represents the normal direction of the surface, enabling the vector direction of the vector function on any grid of the surface to be the normal direction of the surface, enabling the vector direction to point to the direction of heat conduction from high temperature to low temperature, and setting the heat conduction coefficient of the heat insulation fiber layer in the specified direction of the vector function as the heat conduction coefficient of the direction vertical to the surface of the heat insulation fiber layer; defining a vector function which is applicable to the surface and represents the tangential direction of the surface, and enabling the vector direction of the vector function on any grid of the surface to be the tangential direction of the surface; and setting the heat conduction coefficient of the thermal insulation fiber layer in the direction specified by the vector function as the heat conduction coefficient along the tangential direction of the surface of the thermal insulation fiber layer.
In some examples, the setting of the heat radiation condition and the convection boundary condition includes: setting the surface emissivity of each layer for radiation calculation; setting the heat productivity or surface temperature of the heat source and the emissivity of the surface of the heat source; setting convection boundary conditions for a surrounding flow field, including: the inlet and outlet boundary conditions of the domain, the ambient temperature, are calculated.
In some examples, the simulation module is to determine an effect of a property of each layer on a conductive property of heat within each layer and an effect of a different property of a thermal conductivity property of the insulating fiber layer on heat conduction.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow diagram of a method for simulated analysis of thermal insulation performance of a heat shield in accordance with one embodiment of the present invention;
FIG. 2 is a schematic representation of a three-dimensional geometric modeling of a heat source and a heat shield in a method for simulated analysis of thermal insulation performance of a heat shield in accordance with an embodiment of the present invention;
FIG. 3 is a schematic plan view of a thermal insulation fiber along the normal function of the surface in a method for simulated analysis of thermal insulation performance of a thermal shield according to an embodiment of the present invention;
FIG. 4 is a three-dimensional schematic representation of a normal function of thermal insulation fibers along a surface in a method for simulated analysis of thermal insulation performance of a thermal shield according to one embodiment of the present invention;
FIG. 5 is a schematic plan view of a tangential function of thermal insulation fibers along a surface in a method for simulated analysis of thermal insulation performance of a heat shield in accordance with one embodiment of the present invention;
FIG. 6 is a block diagram of a system for simulated analysis of thermal insulation performance of a heat shield in accordance with one embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
The following describes a simulation analysis method and system for thermal insulation performance of a thermal shield according to an embodiment of the invention with reference to the drawings.
Before describing a method for simulation analysis of thermal insulation performance of a heat shield according to an embodiment of the present invention, a heat shield will first be described, in an embodiment of the present invention, the heat shield includes: the metal outer layer, the metal inner layer and locate the thermal-insulated fibre layer between metal outer layer and the metal inner layer. As shown in fig. 2, a three-layer "sandwich" heat shield is included.
FIG. 1 is a flow chart of a method of simulated analysis of thermal insulation performance of a heat shield in accordance with one embodiment of the present invention. As shown in fig. 1, a method for simulation analysis of thermal insulation performance of a heat shield according to an embodiment of the present invention includes the steps of:
s101: a mesh model is established based on the actual geometry of the heat source and the heat shield, wherein the network model of the heat shield comprises a network model of each layer of insulation material.
Wherein, the network model includes: a geometric model of a metal outer layer of the heat shield, a geometric model of a heat-insulating fiber layer of the heat shield, a geometric model of a metal inner layer of the heat shield, and a geometric model of the heat source.
That is, the geometric structure of each layer of heat insulating material of the heat source, "sandwich" structure heat shield is established, and the specific geometric model is as shown in fig. 2, and the geometric structure of the outermost layer material 1 (metal outer layer) of the heat shield, the geometric structure of the heat shield middle layer heat insulating fiber material 2 (heat insulating fiber layer), the geometric structure of the innermost layer material 3 (metal inner layer) of the heat shield and the geometric structure of the heat source 4 are established.
S102: setting simulation parameters of each layer in the network model of the heat shield, wherein the simulation parameters comprise: the metal outer layer with the density of metal inlayer, specific heat and coefficient of heat conduction, the density of thermal-insulated fibrous layer, specific heat and along the thermal conductivity coefficient of the surface tangential direction of thermal-insulated fibrous layer and perpendicular the coefficient of heat conduction of the surface direction of thermal-insulated fibrous layer.
Namely: the material properties of each layer of insulating material in the heat shield of the "sandwich" structure are set.
Material Properties of the insulation, including the Material Density (kg/m)3) Specific heat (J/kg-K) and coefficient of thermal conductivity (W/m-K). The density, specific heat and heat conductivity of the metal material are all constant values. For intermediate insulating fibrous materials, materialsThe material density and specific heat are fixed values, and the heat conduction coefficients are different in the direction along the plane and the direction vertical to the plane, and need to be defined respectively:
(1) defining a vector function which is applicable to any complex surface and represents the normal direction of the surface, ensuring that the vector direction of the function on any grid of the surface of the material is the normal direction of the surface, and the direction points to the direction of heat conduction from high temperature to low temperature.
The thermal conductivity of the insulating fiber material in the direction specified by the function, i.e., the thermal conductivity in the direction perpendicular to the surface, is set.
(2) A vector function which is applicable to any complex surface and represents the tangential direction of the surface is defined, and the vector direction of the function on any grid of the surface of the material is ensured to be the tangential direction of the surface.
In the above example, the definition of the thermal conductivity needs to be implemented by defining a vector function for the intermediate thermal insulation layer. Firstly, defining a vector function which is shown in figures 3 and 4 and represents the surface normal direction of the material of the heat shield intermediate layer, wherein the vector value of the function at each surface grid is 1, and the direction points to the direction of heat conduction from high temperature to low temperature, and setting the heat conduction coefficient of the material in the specified direction of the function; next, a vector function representing the tangent to the surface of the heat shield intermediate layer material as shown in fig. 5 is defined, the vector value of the function at each surface mesh is 1, and the heat transfer coefficient of the material in the direction specified by the function is set.
S103: a heat radiation condition and a convection boundary condition are set.
The method specifically comprises the following steps: setting the surface emissivity of each layer for radiation calculation; setting the heat productivity or surface temperature of the heat source and the emissivity of the surface of the heat source; setting convection boundary conditions for a surrounding flow field, including: the inlet and outlet boundary conditions of the domain, the ambient temperature, etc. are calculated.
S104: and according to the heat radiation condition and the convection boundary condition, carrying out heat insulation performance simulation on the heat insulation cover through the network model according to preset simulation model parameters so as to determine the heat insulation performance of the heat insulation cover.
For example: the effect of the properties of each layer on the conductive properties of heat within each layer and the effect of the anisotropic nature of the thermal conductivity properties of the insulating fiber layers on heat conduction are determined. The preset simulation model parameters comprise parameters such as calculation step number, time step length, data real-time monitoring and the like, so that the heat insulation performance of the heat shield is determined.
According to the simulation analysis method for the heat insulation performance of the heat insulation cover, the influence of different material performances on the heat conduction in each layer of heat insulation material can be truly embodied, the influence of different thermal conductivity performances of the heat insulation material on the heat conduction can be truly embodied, and therefore the heat insulation performance of the heat insulation cover can be accurately determined.
As shown in fig. 6, an embodiment of the present invention discloses a thermal insulation performance simulation analysis system 600 for a thermal shield, comprising: a model building module 610, a simulation parameter setting module 620, a condition setting module 630 and a simulation module 640.
Wherein the model building module 610 is configured to build a mesh model based on the actual geometry of the heat source and the heat shield, wherein the network model of the heat shield comprises a network model of each layer of insulation material. The simulation parameter setting module 620 is configured to set a simulation parameter of each layer in the network model of the heat shield, where the simulation parameter includes: the metal outer layer with the density of metal inlayer, specific heat and coefficient of heat conduction, the density of thermal-insulated fibrous layer, specific heat and along the thermal conductivity coefficient of the surface tangential direction of thermal-insulated fibrous layer and perpendicular the coefficient of heat conduction of the surface direction of thermal-insulated fibrous layer. The condition setting module 630 is used to set a heat radiation condition and a convection boundary condition. The simulation module 640 is configured to perform thermal insulation performance simulation of the thermal shield according to the thermal radiation condition and the convection boundary condition and according to preset simulation model parameters through the network model, so as to determine the thermal insulation performance of the thermal shield.
In one embodiment of the present invention, the network model includes: a geometric model of a metal outer layer of the heat shield, a geometric model of a heat-insulating fiber layer of the heat shield, a geometric model of a metal inner layer of the heat shield, and a geometric model of the heat source.
In one embodiment of the present invention, the thermal conductivity in the tangential direction of the surface of the insulating fiber layer and the thermal conductivity in the direction perpendicular to the surface of the insulating fiber layer are obtained as follows: defining a vector function which is applicable to the surface and represents the normal direction of the surface, enabling the vector direction of the vector function on any grid of the surface to be the normal direction of the surface, enabling the vector direction to point to the direction of heat conduction from high temperature to low temperature, and setting the heat conduction coefficient of the heat insulation fiber layer in the specified direction of the vector function as the heat conduction coefficient of the direction vertical to the surface of the heat insulation fiber layer; defining a vector function which is applicable to the surface and represents the tangential direction of the surface, and enabling the vector direction of the vector function on any grid of the surface to be the tangential direction of the surface; and setting the heat conduction coefficient of the thermal insulation fiber layer in the direction specified by the vector function as the heat conduction coefficient along the tangential direction of the surface of the thermal insulation fiber layer.
In one embodiment of the present invention, the setting of the heat radiation condition and the convection boundary condition includes: setting the surface emissivity of each layer for radiation calculation; setting the heat productivity or surface temperature of the heat source and the emissivity of the surface of the heat source; setting convection boundary conditions for a surrounding flow field, including: the inlet and outlet boundary conditions of the domain, the ambient temperature, are calculated.
In one embodiment of the present invention, the simulation module 640 is used to determine the effect of the properties of each layer on the conductive properties of heat within each layer and the effect of the anisotropic nature of the thermal conductivity of the insulating fiber layers on heat conduction.
According to the simulation analysis system for the heat insulation performance of the heat shield, disclosed by the embodiment of the invention, the influence of different material performances on the heat conduction in each layer of heat insulation material can be truly embodied, and the influence of different thermal conductivity performances of the heat insulation material on the heat conduction can be truly embodied, so that the heat insulation performance of the heat shield can be accurately determined.
It should be noted that a specific implementation manner of the thermal insulation performance simulation analysis system of the thermal shield according to the embodiment of the present invention is similar to that of the thermal insulation performance simulation analysis system of the thermal shield according to the embodiment of the present invention, and please refer to the description of the method portion specifically, and details are not repeated here in order to reduce redundancy.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (6)
1. A method of simulated analysis of thermal insulation performance of a thermal shield, the thermal shield comprising: the heat insulation fiber layer comprises a metal outer layer, a metal inner layer and a heat insulation fiber layer arranged between the metal outer layer and the metal inner layer, and the method comprises the following steps:
establishing a mesh model based on actual geometric dimensions of the heat source and the heat shield, wherein the network model of the heat shield comprises a network model of each layer of insulation material;
setting simulation parameters of each layer in the network model of the heat shield, wherein the simulation parameters comprise: the density, specific heat and heat conduction coefficient of the metal outer layer and the metal inner layer, the density, specific heat and heat conduction coefficient of the heat insulation fiber layer along the surface tangential direction of the heat insulation fiber layer and the heat conduction coefficient of the heat insulation fiber layer vertical to the surface direction;
setting a heat radiation condition and a convection boundary condition;
according to the thermal radiation condition and the convection boundary condition, simulating the heat insulation performance of the heat insulation cover through the network model according to preset simulation model parameters so as to determine the heat insulation performance of the heat insulation cover;
wherein the heat conduction coefficient in the tangential direction of the surface of the thermal insulation fiber layer and the heat conduction coefficient in the direction perpendicular to the surface of the thermal insulation fiber layer are obtained as follows:
defining a vector function which is applicable to the surface and represents the normal direction of the surface, enabling the vector direction of the vector function on any grid of the surface to be the normal direction of the surface, enabling the vector direction to point to the direction of heat conduction from high temperature to low temperature, and setting the heat conduction coefficient of the heat insulation fiber layer in the specified direction of the vector function as the heat conduction coefficient of the direction vertical to the surface of the heat insulation fiber layer;
defining a vector function which is applicable to the surface and represents the tangential direction of the surface, and enabling the vector direction of the vector function on any grid of the surface to be the tangential direction of the surface; setting the heat conduction coefficient of the heat insulation fiber layer in the direction specified by the vector function as the heat conduction coefficient along the tangential direction of the surface of the heat insulation fiber layer;
wherein, according to heat radiation condition and convection boundary condition, pass through according to predetermined simulation model parameter the heat-proof quality simulation of heat shield is carried out to the network model to confirm the heat-proof quality of heat shield includes:
the effect of the properties of each layer on the conductive properties of heat within each layer and the effect of the anisotropic nature of the thermal conductivity properties of the insulating fiber layers on heat conduction are determined.
2. The method of simulated analysis of thermal insulation properties of a heat shield of claim 1, wherein said network model comprises: a geometric model of a metal outer layer of the heat shield, a geometric model of a heat-insulating fiber layer of the heat shield, a geometric model of a metal inner layer of the heat shield, and a geometric model of the heat source.
3. The method of simulated analysis of thermal insulation properties of a heat shield of claim 1, wherein said setting of thermal radiation conditions and convection boundary conditions comprises:
setting the surface emissivity of each layer for radiation calculation;
setting the heat productivity or surface temperature of the heat source and the emissivity of the surface of the heat source;
setting convection boundary conditions for a surrounding flow field, including: the inlet and outlet boundary conditions of the domain, the ambient temperature, are calculated.
4. A thermal insulation performance simulation analysis system for a thermal shield, the thermal shield comprising: outer layer of metal, metal inlayer and locate outer layer of metal with thermal-insulated fibrous layer between the metal inlayer, the system includes:
a model building module for building a mesh model from actual geometric dimensions of the heat source and the heat shield, wherein the network model of the heat shield comprises a network model of each layer of insulation material;
a simulation parameter setting module for setting simulation parameters of each layer in the network model of the heat shield, wherein the simulation parameters include: the density, specific heat and heat conduction coefficient of the metal outer layer and the metal inner layer, the density, specific heat and heat conduction coefficient of the heat insulation fiber layer along the surface tangential direction of the heat insulation fiber layer and the heat conduction coefficient of the heat insulation fiber layer vertical to the surface direction;
the condition setting module is used for setting a heat radiation condition and a convection boundary condition;
the simulation module is used for simulating the heat insulation performance of the heat shield through the network model according to the heat radiation condition and the convection boundary condition and preset simulation model parameters so as to determine the heat insulation performance of the heat shield;
wherein the heat conduction coefficient in the tangential direction of the surface of the thermal insulation fiber layer and the heat conduction coefficient in the direction perpendicular to the surface of the thermal insulation fiber layer are obtained as follows:
defining a vector function which is applicable to the surface and represents the normal direction of the surface, enabling the vector direction of the vector function on any grid of the surface to be the normal direction of the surface, enabling the vector direction to point to the direction of heat conduction from high temperature to low temperature, and setting the heat conduction coefficient of the heat insulation fiber layer in the specified direction of the vector function as the heat conduction coefficient of the direction vertical to the surface of the heat insulation fiber layer;
defining a vector function which is applicable to the surface and represents the tangential direction of the surface, and enabling the vector direction of the vector function on any grid of the surface to be the tangential direction of the surface; setting the heat conduction coefficient of the heat insulation fiber layer in the direction specified by the vector function as the heat conduction coefficient along the tangential direction of the surface of the heat insulation fiber layer;
wherein the simulation module is used for determining the influence of the performance of each layer on the heat conduction performance in each layer and the influence of the different characteristics of the heat conduction performance of the heat insulation fiber layer on the heat conduction.
5. The system for simulated analysis of thermal insulation properties of a heat shield of claim 4, wherein said network model comprises: a geometric model of a metal outer layer of the heat shield, a geometric model of a heat-insulating fiber layer of the heat shield, a geometric model of a metal inner layer of the heat shield, and a geometric model of the heat source.
6. The thermal shield insulation performance simulation analysis system of claim 4, wherein said setting of thermal radiation conditions and convection boundary conditions comprises:
setting the surface emissivity of each layer for radiation calculation;
setting the heat productivity or surface temperature of the heat source and the emissivity of the surface of the heat source;
setting convection boundary conditions for a surrounding flow field, including: the inlet and outlet boundary conditions of the domain, the ambient temperature, are calculated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810714024.1A CN108491676B (en) | 2018-06-29 | 2018-06-29 | Heat insulation performance simulation analysis method and system of heat shield |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810714024.1A CN108491676B (en) | 2018-06-29 | 2018-06-29 | Heat insulation performance simulation analysis method and system of heat shield |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108491676A CN108491676A (en) | 2018-09-04 |
| CN108491676B true CN108491676B (en) | 2021-10-22 |
Family
ID=63343286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810714024.1A Active CN108491676B (en) | 2018-06-29 | 2018-06-29 | Heat insulation performance simulation analysis method and system of heat shield |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108491676B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113626932B (en) * | 2021-08-11 | 2022-06-14 | 长春理工大学 | Assembly method for eliminating array heat-proof structure paving accumulated error |
| CN117236144B (en) * | 2023-11-15 | 2024-01-26 | 中国空气动力研究与发展中心计算空气动力研究所 | Method for determining heat conduction main axis of orthotropic heat-proof material based on mounting molded surface |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102760185A (en) * | 2012-06-13 | 2012-10-31 | 江苏大学 | Method for determining convective heat transfer coefficient for tire temperature field analysis |
| CN104504212A (en) * | 2015-01-04 | 2015-04-08 | 天津工业大学 | Method for predicting heat protection performance of fabric |
| CN104918781A (en) * | 2012-11-16 | 2015-09-16 | 莱茵兹-迪兹通斯-有限公司 | Heat shield |
| CN105508011A (en) * | 2015-11-30 | 2016-04-20 | 重庆祥吉机械制造有限公司 | Heat shield device |
| CN106194378A (en) * | 2016-09-30 | 2016-12-07 | 长春超维科技产业有限责任公司 | A kind of Novel exhaust manifold heat shield and manufacture method thereof |
| CN106321211A (en) * | 2016-11-19 | 2017-01-11 | 东风(十堰)气缸垫有限公司 | Exhaust manifold gasket heat shield assembly and supercharger gasket heat shield assembly |
| CN106446370A (en) * | 2016-09-09 | 2017-02-22 | 北京汽车股份有限公司 | Method and apparatus for calculating rotational inertia of multi-body dynamic model and vehicle body model |
| CN106649923A (en) * | 2016-09-14 | 2017-05-10 | 北京汽车股份有限公司 | Thermal damage assessment method and device for engine exhaust system |
| CN106844899A (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 Steady-State Thermal Field |
| CN107278189A (en) * | 2015-06-08 | 2017-10-20 | 宝马股份公司 | For the radiations heat energy and the heat shield of the part of sound in vehicle |
| WO2018042369A1 (en) * | 2016-08-31 | 2018-03-08 | Intex Industries Xiamen Co. Ltd. | Thermal insulation structure for a liquid enclosure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150158267A1 (en) * | 2013-12-05 | 2015-06-11 | Carcoustics Techconsult Gmbh | Two-layer composite heat shield for underbody of a vehicle |
-
2018
- 2018-06-29 CN CN201810714024.1A patent/CN108491676B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102760185A (en) * | 2012-06-13 | 2012-10-31 | 江苏大学 | Method for determining convective heat transfer coefficient for tire temperature field analysis |
| CN104918781A (en) * | 2012-11-16 | 2015-09-16 | 莱茵兹-迪兹通斯-有限公司 | Heat shield |
| CN104504212A (en) * | 2015-01-04 | 2015-04-08 | 天津工业大学 | Method for predicting heat protection performance of fabric |
| CN107278189A (en) * | 2015-06-08 | 2017-10-20 | 宝马股份公司 | For the radiations heat energy and the heat shield of the part of sound in vehicle |
| CN105508011A (en) * | 2015-11-30 | 2016-04-20 | 重庆祥吉机械制造有限公司 | Heat shield device |
| WO2018042369A1 (en) * | 2016-08-31 | 2018-03-08 | Intex Industries Xiamen Co. Ltd. | Thermal insulation structure for a liquid enclosure |
| CN106446370A (en) * | 2016-09-09 | 2017-02-22 | 北京汽车股份有限公司 | Method and apparatus for calculating rotational inertia of multi-body dynamic model and vehicle body model |
| CN106649923A (en) * | 2016-09-14 | 2017-05-10 | 北京汽车股份有限公司 | Thermal damage assessment method and device for engine exhaust system |
| CN106194378A (en) * | 2016-09-30 | 2016-12-07 | 长春超维科技产业有限责任公司 | A kind of Novel exhaust manifold heat shield and manufacture method thereof |
| CN106321211A (en) * | 2016-11-19 | 2017-01-11 | 东风(十堰)气缸垫有限公司 | Exhaust manifold gasket heat shield assembly and supercharger gasket heat shield assembly |
| CN106844899A (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 Steady-State Thermal Field |
Non-Patent Citations (2)
| Title |
|---|
| 汽车压缩机热害问题的CFD仿真优化及试验验证;张晓春;《制造研究》;20180315;102-106 * |
| 汽车压缩机热害问题的CFD仿真及优化;郭祥麟;《2017汽车空气动力学分会学术年会论文集》;20170906;1-7 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108491676A (en) | 2018-09-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8744824B2 (en) | Optimization design method for the chassis structure of an electronic device based on mechanical, electrical and thermal three-field coupling | |
| CN108009336B (en) | Multi-objective optimization method for micro-truss structure bearing and thermal protection structure | |
| CN108491676B (en) | Heat insulation performance simulation analysis method and system of heat shield | |
| CN110083908B (en) | Cable core temperature prediction method based on finite element analysis | |
| CN108052697B (en) | Gallery pipe GI L three-dimensional temperature field and expansion deformation calculation method based on workbench | |
| Shah et al. | A practical approach towards muffler design, development and prototype validation | |
| Baran et al. | Reliability estimation of the pultrusion process using the first-order reliability method (FORM) | |
| CN112231945B (en) | Power battery system thermal diffusion joint simulation method based on star CCM + and Amesim | |
| CN112069667B (en) | Intercooler flow thermosetting coupling numerical simulation method | |
| CN111027187A (en) | Simplified analysis method for transformer multi-physical field winding structure based on thermal parameter equivalence | |
| CN111324975B (en) | Method for determining maximum field intensity of intermediate joint for medium-low voltage direct current XLPE cable | |
| CN114970269A (en) | Cable shielding effectiveness evaluation method, device, equipment and medium | |
| CN106599383A (en) | Time domain response-based inter-double-cable transient state temperature rise acquisition method | |
| CN104732010B (en) | A kind of multilayer thermal protection struc ture fast Optimization | |
| CN114779030B (en) | Method and system for determining insulation strength of transformer wire outlet device | |
| CN106294966A (en) | A kind of list telegram in reply cable core transient state temperature rise acquisition methods being independent of skin temperature | |
| WO2002041193A1 (en) | Nonlinear systems | |
| CN111783281B (en) | Optimization method for thickness of multilayer heat insulation medium | |
| Kuznetzov et al. | Numerical investigation of thermal regimes in twin-tube-channel heat pipelines using conductive-convective model of heat transfer | |
| CN111581750B (en) | Multi-disciplinary multi-index product structure optimization design method based on ISIGHT software | |
| CN115438511A (en) | Energy storage device cooling design method and device | |
| Pal | Design and acoustic analysis of hybrid muffler | |
| Ravanbod et al. | Porous liner coated inlet duct: a novel approach to attenuate automotive turbocharger inlet flow-induced sound propagation | |
| Abdullah et al. | On theoretical of transmission loss in exhaust muffler system | |
| CN114476139B (en) | Mars circulator traveling wave tube assembly thermal control design system and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |