CN107832521B - Optimization design method for air inlet pipeline system of gravure press oven - Google Patents
Optimization design method for air inlet pipeline system of gravure press oven Download PDFInfo
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Abstract
The invention discloses an optimal design method of an air inlet pipeline system of a gravure press oven, which is implemented according to the following steps: the method is implemented according to the following steps: step 1: designing a structure of an air inlet pipeline system of the oven; step 2: modeling a fluid domain, and discretizing the fluid domain; and step 3: displaying and analyzing the flow field operation result; and 4, step 4: selecting a component having significant eddy current characteristics; and 5: and determining the design structure of the final oven air inlet pipeline system. The invention is simple and clear, and convenient to use; the practicability is strong; the oven air inlet pipeline system designed by the invention improves the uniformity of the air inlet speed of the oven and reduces the energy loss of the air inlet pipeline system.
Description
Technical Field
The invention belongs to the field of printing equipment, and relates to an optimal design method of an air inlet pipeline system of a gravure press oven.
Background
At present, most of the drying ovens of the gravure printing machine are arranged between all printing machine groups, and hot air blown out by a row of air nozzles dries printing ink on a web base material or a printing stock. The air inlet pipeline system of the gravure press oven comprises a fan, a heater, an air inlet pipe, an air return pipe, a pipe cavity and the like, and is used for conveying hot air to the oven. The fresh air and the secondary hot air are heated by a heater and then sent into the oven through pipelines in various forms. The existing air inlet pipeline system of the gravure press oven is generally designed by an empirical design method without optimization design, but the designed oven easily generates vortex, so that the air velocity entering the oven is uneven, and the energy consumption is increased.
Disclosure of Invention
The invention aims to provide an optimal design method of an air inlet pipeline system of a gravure press oven, so as to improve the uniformity of the air inlet speed of the oven.
The invention adopts the technical scheme that the optimization design method of the air inlet pipeline system of the gravure press oven is implemented according to the following steps:
step 1: designing a structure of an oven air inlet pipeline system according to the space of the gravure press, the size of an oven body and the type selection of a fan, wherein the oven air inlet pipeline system comprises a heater, an air inlet pipe, an air return pipe and a pipe cavity, and determining the structures and the sizes of the heater, the air inlet pipe, the air return pipe and the pipe cavity, or directly obtaining the structure of the oven air inlet pipeline system to be optimized from an enterprise;
step 2: modeling the fluid domain of the air inlet pipeline system designed in the step 1 by using three-dimensional design software, and then discretizing the fluid domain by using gridding processing software;
and step 3: setting boundary conditions for the fluid domain subjected to discretization in the step 2 by using fluid simulation software, setting a motion control equation and a power control equation threshold value of iterative operation and a threshold value of an energy equation, performing iterative solution by using the fluid simulation software, importing a solution result into visual post-processing software for post-processing, and displaying and analyzing a flow field operation result;
and 4, step 4: performing flow field analysis according to the flow field analysis result in the step 3, and selecting a component with obvious vortex characteristics;
and 5: and (4) carrying out structural optimization on the components selected in the step (4) and determining the final design structure of the oven air inlet pipeline system.
The present invention is also characterized in that,
step 4, specifically, flow field analysis is carried out according to the flow field analysis result in the step 3, and a bent pipe with obvious vortex characteristics is selected;
the step 5 is specifically that,
step 5.1: preliminarily determining different adding schemes for adding the cambered surface guide plate in the bent pipe;
step 5.2: respectively utilizing three-dimensional design software to model the fluid domains of the bent pipes with different addition schemes, and then utilizing gridding processing software to carry out discretization processing on the fluid domains;
step 5.3: setting boundary conditions for the fluid domain subjected to discretization in the step 5.2 by using fluid simulation software, setting motion control equation and power control equation thresholds which are completely consistent with those of iterative operation in the step 3 and thresholds of energy equations, performing iterative solution by using the fluid simulation software Fluent, introducing a solution result into visual post-processing software for post-processing, and displaying and analyzing a flow field operation result;
step 5.4: comparing the flow field operation results of the bent pipes with different addition schemes in the step 5.1, selecting an addition scheme which has uniform flow field inside the bent pipe and does not have the eddy phenomenon, and determining the gravure press oven air inlet pipeline system with the bent pipe structure adjusted according to the scheme as the final design structure of the oven air inlet pipeline system.
Step 4, specifically, performing flow field analysis according to the flow field analysis result in the step 3, and selecting a funnel-shaped pipeline with obvious vortex characteristics;
the step 5 is specifically that,
step 5.1: the method comprises the following steps of (1) carrying out equal-area separation on the interior of a funnel-shaped pipeline by adding criss-cross planar air homogenizing plates, and preliminarily determining different adding schemes;
step 5.2: respectively utilizing three-dimensional design software to model the funnel-shaped pipelines with different addition schemes in a fluid domain mode, and then utilizing gridding processing software to carry out discretization processing on the fluid domain;
step 5.3: setting boundary conditions for the fluid domain subjected to discretization in the step 5.2 by using fluid simulation software, setting motion control equation and power control equation thresholds which are completely consistent with those of iterative operation in the step 3 and thresholds of energy equations, performing iterative solution by using the fluid simulation software Fluent, introducing a solution result into visual post-processing software for post-processing, and displaying and analyzing a flow field operation result;
step 5.4: and (3) comparing the flow field operation results of the bent pipes with different addition schemes in the step 5.1, selecting an addition scheme which has uniform flow field in the funnel-shaped pipeline and does not have the eddy phenomenon, and determining the gravure press oven air inlet pipeline system with the funnel-shaped pipeline added with the air homogenizing plate as the final design structure of the oven air inlet pipeline system.
Step 4, specifically, performing flow field analysis according to the flow field analysis result in the step 3, and selecting a tube cavity with obvious vortex characteristics;
the step 5 is specifically that,
step 5.1: preliminarily determining different adding schemes of adding a plane hole air homogenizing plate in the tube cavity, wherein circular holes which are uniformly arranged at equal intervals are formed in the plane hole air homogenizing plate;
step 5.2: respectively carrying out fluid domain modeling on the lumens of different adding schemes by using three-dimensional design software, and then carrying out discretization treatment on the fluid domains by using gridding treatment software;
step 5.3: setting boundary conditions for the fluid domain subjected to discretization in the step 5.2 by using fluid simulation software, setting motion control equation and power control equation thresholds which are completely consistent with those of iterative operation in the step 3 and thresholds of energy equations, performing iterative solution by using the fluid simulation software Fluent, introducing a solution result into visual post-processing software for post-processing, and displaying and analyzing a flow field operation result;
step 5.4: and (3) comparing the flow field operation results of the bent pipes with different addition schemes in the step 5.1, selecting an addition scheme which has uniform flow field in the pipe cavity and does not have the eddy phenomenon, and determining the air inlet pipeline system of the gravure press oven with the adjusted pipe cavity structure of the scheme as the final design structure of the air inlet pipeline system of the oven.
The set boundary conditions include the velocity and temperature at the velocity inlet, the static pressure at the pressure outlet, the wall conditions and the calculation model.
The discretization processing of the fluid domain by using the gridding processing software is specifically to introduce a fluid model into the gridding processing software for grid division, wherein a main body adopts a tetrahedral grid, a linking area adopts a mixed grid of a hexahedron, a wedge and a pyramidal grid for division, and part of the meshing area is encrypted and divided.
GAMBIT is adopted as gridding processing software.
The fluid simulation software uses Fluent.
The visualization post-processing software employs Tecplot.
The invention has the advantages that the optimization design method of the air inlet pipeline system of the gravure press oven is simple and clear, and is convenient to apply; the air inlet pipeline system of the gravure press oven is designed by utilizing gridding processing software, fluid simulation software, visual post-processing software and the like, and a design scheme is determined according to the final data analysis result, so that the practicability is high; the oven air inlet pipeline system designed by the invention improves the uniformity of the air inlet speed of the oven and reduces the energy loss of the air inlet pipeline system.
Drawings
FIG. 1 is a fluid domain modeling diagram of the air inlet duct system of the gravure oven designed in step 2 of example 1;
FIG. 2 is a schematic diagram of a preset position scheme of adding the cambered surface guide plate in the step 5 in the embodiment 1;
FIG. 3 is a fluid domain modeling diagram of the funnel shaped conduit after structure adjustment in step 5 of example 2;
FIG. 4 is a schematic diagram showing a preset position of the air distribution plate with holes in step 5 of example 3;
fig. 5 is a fluid domain modeling diagram of the gravure oven intake duct system designed in step 2 of example 4.
Detailed Description
The invention relates to an optimal design method of an air inlet pipeline system of a gravure press oven, which is implemented according to the following steps:
step 1: designing a structure of an oven air inlet pipeline system according to the space of the gravure press, the size of an oven body and the type selection of a fan, wherein the oven air inlet pipeline system comprises a heater, an air inlet pipe, an air return pipe and a pipe cavity, and determining the structures and the sizes of the heater, the air inlet pipe, the air return pipe and the pipe cavity, or directly obtaining the structure of the oven air inlet pipeline system to be optimized from an enterprise;
step 2: modeling the fluid domain of the air inlet pipeline system designed in the step 1 by using three-dimensional design software, and then discretizing the fluid domain by using gridding processing software GAMBIT;
and step 3: setting boundary conditions for the fluid domain subjected to discretization in the step 2 by using fluid simulation software, setting a motion control equation and a power control equation threshold value of iterative operation and a threshold value of an energy equation, performing iterative solution by using the fluid simulation software, introducing a solution result into visual post-processing software Tecplot for post-processing, and displaying and analyzing a flow field operation result;
and 4, step 4: performing flow field analysis according to the flow field analysis result in the step 3, and selecting a component with obvious vortex characteristics;
and 5: and (4) carrying out structural optimization on the components selected in the step (4) and determining the final design structure of the oven air inlet pipeline system.
The specific operation contents of step 4 and step 5 are three types:
the first method comprises the following steps: step 4, specifically, flow field analysis is carried out according to the flow field analysis result in the step 3, and a bent pipe with obvious vortex characteristics is selected;
the step 5 is specifically that,
step 5.1: preliminarily determining different adding schemes for adding the cambered surface guide plate in the bent pipe;
step 5.2: respectively carrying out fluid domain modeling on the bent pipes with different adding schemes by using three-dimensional design software, and then carrying out discretization treatment on the fluid domains by using gridding treatment software GAMBIT;
step 5.3: setting boundary conditions for the fluid domain subjected to discretization processing in the step 5.2 by using fluid simulation software Fluent, setting a motion control equation and a power control equation threshold which are completely consistent with those of iterative operation in the step 3 and setting a threshold of an energy equation, performing iterative solution by using the fluid simulation software Fluent, introducing a solution result into visual post-processing software Tecplot for post-processing, and displaying and analyzing a flow field operation result;
step 5.4: comparing the flow field operation results of the bent pipes with different addition schemes in the step 5.1, selecting an addition scheme which has uniform flow field inside the bent pipe and does not have the eddy phenomenon, and determining the gravure press oven air inlet pipeline system with the bent pipe structure adjusted according to the scheme as the final design structure of the oven air inlet pipeline system.
And the second method comprises the following steps: step 4, specifically, performing flow field analysis according to the flow field analysis result in the step 3, and selecting a funnel-shaped pipeline with obvious vortex characteristics;
the step 5 is specifically that,
step 5.1: the method comprises the following steps of (1) carrying out equal-area separation on the interior of a funnel-shaped pipeline by adding criss-cross planar air homogenizing plates, and preliminarily determining different adding schemes;
step 5.2: respectively carrying out fluid domain modeling on funnel-shaped pipelines with different addition schemes by using three-dimensional design software, and then carrying out discretization processing on the fluid domains by using gridding processing software GAMBIT;
step 5.3: setting boundary conditions for the fluid domain subjected to discretization processing in the step 5.2 by using fluid simulation software Fluent, setting a motion control equation and a power control equation threshold which are completely consistent with those of iterative operation in the step 3 and setting a threshold of an energy equation, performing iterative solution by using the fluid simulation software Fluent, introducing a solution result into visual post-processing software Tecplot for post-processing, and displaying and analyzing a flow field operation result;
step 5.4: and (3) comparing the flow field operation results of the bent pipes with different addition schemes in the step 5.1, selecting an addition scheme which has uniform flow field in the funnel-shaped pipeline and does not have the eddy phenomenon, and determining the gravure press oven air inlet pipeline system with the funnel-shaped pipeline added with the air homogenizing plate as the final design structure of the oven air inlet pipeline system.
And the third is that: step 4, specifically, performing flow field analysis according to the flow field analysis result in the step 3, and selecting a tube cavity with obvious vortex characteristics;
the step 5 is specifically that,
step 5.1: preliminarily determining different adding schemes of adding a plane hole air homogenizing plate in the tube cavity, wherein circular holes which are uniformly arranged at equal intervals are formed in the plane hole air homogenizing plate;
step 5.2: respectively carrying out fluid domain modeling on the lumens with different adding schemes by using three-dimensional design software, and then carrying out discretization treatment on the fluid domains by using gridding treatment software GAMBIT;
step 5.3: setting boundary conditions for the fluid domain subjected to discretization processing in the step 5.2 by using fluid simulation software Fluent, setting a motion control equation and a power control equation threshold which are completely consistent with those of iterative operation in the step 3 and setting a threshold of an energy equation, performing iterative solution by using the fluid simulation software Fluent, introducing a solution result into visual post-processing software Tecplot for post-processing, and displaying and analyzing a flow field operation result;
step 5.4: and (3) comparing the flow field operation results of the bent pipes with different addition schemes in the step 5.1, selecting an addition scheme which has uniform flow field in the pipe cavity and does not have the eddy phenomenon, and determining the air inlet pipeline system of the gravure press oven with the adjusted pipe cavity structure of the scheme as the final design structure of the air inlet pipeline system of the oven.
Wherein the set boundary conditions include velocity and temperature at the velocity inlet, static pressure at the pressure outlet, wall conditions, and computational models.
The discretization processing of the fluid domain by using the gridding processing software GAMBIT is specifically to introduce a fluid model into the gridding processing software GAMBIT for grid division, divide a main body by using a tetrahedral grid, divide a connection area by using a mixed grid of a hexahedron, a wedge and a pyramidal grid, and perform encryption division locally.
Through the mode, the optimization design method of the air inlet pipeline system of the drying oven of the gravure press is simple and clear, and is convenient to apply; the air inlet pipeline system of the gravure press oven is designed by utilizing gridding processing software, fluid simulation software, visual post-processing software and the like, and a design scheme is determined according to the final data analysis result, so that the practicability is high; the oven air inlet pipeline system designed by the invention improves the uniformity of the air inlet speed of the oven and reduces the energy loss of the air inlet pipeline system.
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Example 1
The embodiment provides an optimal design method for an air inlet pipeline system of a gravure press oven, which is implemented according to the following steps:
step 1: designing the structure of an oven air inlet pipeline system according to the space of the gravure press, the size of an oven body and the type selection of a fan, determining the structures and the sizes of a heater, an air inlet pipe, an air return pipe and a pipe cavity part, or directly obtaining the structure of the oven air inlet pipeline system to be optimized from an enterprise;
step 2: performing fluid domain modeling on the air inlet pipeline system designed in the step 1 by using three-dimensional design software, wherein the model is shown in figure 1, and then performing discretization processing on the fluid domain by using gridding processing software GAMBIT;
and step 3: and (3) setting boundary conditions for the fluid domain subjected to discretization processing in the step (2) by using fluid simulation software, wherein the boundary conditions comprise a speed inlet: speed 30m/s, pressure outlet: static pressure 101325pa, wall conditions: selecting a turbulent RNG (reforming group method) k-epsilon model as a calculation model, and setting the motion control equation and power control equation threshold values of iterative operation to be 1 multiplied by 10-3And threshold value of energy equation 1 × 10-6Performing iterative solution, and guiding the solution result into visual post-processing software Tecplot for post-processing to obtain a trace diagram of the oven air inlet pipeline system for displaying and analyzing a flow field operation result, wherein the color of the line of the trace diagram represents the speed, the cooler the hue is, the higher the warmer the hue is, and the density of the line represents the air volume;
and 4, step 4: performing flow field analysis according to the flow field analysis result in the step 3, and selecting the bent pipe with obvious vortex characteristics;
and 5: performing structural optimization on the member selected in the step 4 to determine the final design structure of the oven air inlet pipeline system
Step 5.1: different adding schemes for preliminarily determining adding of cambered surface guide plate in bent pipe
The scheme of the preset position of adding the cambered surface guide plate in the bent pipe is shown in figure 2, the cambered surface guide plate can be added at 5 positions, the cambered surface guide plate is added from 5 positions of inward bending to outward bending, 1 guide plate is added, and 5 different positions are selected; 2 guide plates are added, and 10 different positions are selected; 3 guide plates are added, and 10 different positions are selected; 4 guide plates are added, and 5 different positions are selected; 5 baffles were added, only in the 1 case shown; there are 31 total addition schemes;
step 5.2: respectively carrying out fluid domain modeling on the bent pipes of the 31 schemes in the step 5.1 by using three-dimensional design software, and then carrying out discretization treatment on the fluid domains by using gridding treatment software GAMBIT;
step 5.3: setting boundary conditions for the fluid domain subjected to gridding processing in the step 5.2 by using fluid simulation software Fluent, setting motion control equation and power control equation thresholds which are completely consistent with those of iterative operation in the step 3 and thresholds of energy equations, performing iterative solution by using the fluid simulation software Fluent, introducing a solution result into visual post-processing software Tecplot for post-processing, and displaying and analyzing a flow field operation result;
step 5.4: compared with the flow field operation results of the bent pipes with different adding schemes, the optimal scheme is the scheme of adding 2 guide plates at the No. 1 position and the No. 3 position, the optimal scheme is the adding scheme which reduces the maximum flow velocity by 2.67m/s (12.92%) and reduces the pressure difference by 7.7Pa (35.66%) compared with the original structure, the flow field in the bent pipe is uniform, and no vortex phenomenon exists, so that the gravure press oven air inlet pipeline system with the bent pipe structures adjusted by the two schemes is determined as the final design structure of the oven air inlet pipeline system.
Example 2
The embodiment provides an optimal design method for an air inlet pipeline system of a gravure press oven, which is implemented according to the following steps:
step 1: designing the structure of an oven air inlet pipeline system according to the space of the gravure press, the size of an oven body and the type selection of a fan, determining the structures and the sizes of a heater, an air inlet pipe, an air return pipe and a pipe cavity part, or directly obtaining the structure of the oven air inlet pipeline system to be optimized from an enterprise;
step 2: modeling the fluid domain of the air inlet pipeline system designed in the step 1 by using three-dimensional design software, and then discretizing the fluid domain by using gridding processing software GAMBIT;
and step 3: and (3) setting boundary conditions for the fluid domain subjected to discretization processing in the step (2) by using fluid simulation software, wherein the boundary conditions comprise a speed inlet: speed 30m/s, pressure outlet: static pressure 101325pa, wall conditions: selecting a turbulent RNG (reforming group method) k-epsilon model as a calculation model, and setting the motion control equation and power control equation threshold values of iterative operation to be 1 multiplied by 10-3And threshold value of energy equation 1 × 10-6Iterative solution is carried out, then the solution result is led into visual post-processing software Tecplot for post-processing, and the air inlet pipe of the oven is obtainedDisplaying and analyzing a flow field operation result by a trace diagram of the traffic system, wherein the color of the line of the trace diagram represents the speed, the cooler the hue is, the higher the warmer the hue is, and the density of the line represents the air volume;
and 4, step 4: performing flow field analysis according to the flow field analysis result in the step 3, and selecting a funnel-shaped pipeline with obvious vortex characteristics;
and 5: performing structural optimization on the funnel-shaped pipeline selected in the step 4, and determining the final design structure of the oven air inlet pipeline system
Step 5.1: determining different adding schemes of adding 2 multiplied by 2, 3 multiplied by 3, 4 multiplied by 4 and 5 multiplied by 5 which are criss-cross and equidistant plane air homogenizing plates in the funnel-shaped pipeline;
step 5.2: respectively performing fluid domain modeling on funnel-shaped pipelines with different addition schemes in the step 5.1 by using three-dimensional design software, wherein the established model is shown in figure 3, and then performing discretization processing on the fluid domain by using gridding processing software GAMBIT;
step 5.3: setting boundary conditions for the fluid domain subjected to discretization processing in the step 5.2 by using fluid simulation software Fluent, setting a motion control equation and a power control equation threshold which are completely consistent with those of iterative operation in the step 3 and setting a threshold of an energy equation, performing iterative solution by using the fluid simulation software Fluent, introducing a solution result into visual post-processing software Tecplot for post-processing, and displaying and analyzing a flow field operation result;
step 5.4: comparing the flow field operation results of the funnel-shaped pipelines with different addition schemes in the step 5.1, the addition scheme that 3 x 3 criss-cross equidistant planar uniform air plates are added in the interior has uniform flow field of the funnel-shaped pipelines and has no eddy phenomenon is adopted, so that the air inlet pipeline system of the gravure press oven after the structure of the funnel-shaped pipelines is adjusted by the scheme is determined as the final design structure of the air inlet pipeline system of the oven.
Example 3
The embodiment provides an optimal design method for an air inlet pipeline system of a gravure press oven, which is implemented according to the following steps:
step 1: designing the structure of an oven air inlet pipeline system according to the space of the gravure press, the size of an oven body and the type selection of a fan, determining the structures and the sizes of a heater, an air inlet pipe, an air return pipe and a pipe cavity part, or directly obtaining the structure of the oven air inlet pipeline system to be optimized from an enterprise;
step 2: modeling the fluid domain of the air inlet pipeline system designed in the step 1 by using three-dimensional design software, and then discretizing the fluid domain by using gridding processing software GAMBIT;
and step 3: and (3) setting boundary conditions for the fluid domain subjected to discretization processing in the step (2) by using fluid simulation software Fluent, wherein the boundary conditions comprise a speed inlet: speed 30m/s, pressure outlet: static pressure 101325pa, wall conditions: selecting a turbulent RNG (reforming group method) k-epsilon model as a calculation model, and setting the motion control equation and power control equation threshold values of iterative operation to be 1 multiplied by 10-3And threshold value of energy equation 1 × 10-6Performing iterative solution, and guiding the solution result into visual post-processing software Tecplot for post-processing to obtain a trace diagram of the oven air inlet pipeline system for displaying and analyzing a flow field operation result, wherein the color of the line of the trace diagram represents the speed, the cooler the hue is, the higher the warmer the hue is, and the density of the line represents the air volume;
and 4, step 4: performing flow field analysis according to the flow field analysis result in the step 3, and selecting a tube cavity with obvious vortex characteristics;
and 5: carrying out structural optimization on the tube cavity selected in the step 4, and determining the final design structure of the oven air inlet pipeline system
Step 5.1: different adding schemes for preliminarily determining that plane hole air distribution plates are added inside tube cavities
The method is characterized in that circular holes with the same diameter are machined on a rectangular plane hole air distribution plate at equal distances, the diameter of each circular hole is 30mm, the transverse distance is 35mm, the longitudinal distance is 35mm, the total number is 32, the adding positions of the hole air distribution plates are shown in figure 4, the arrangement state of four air distribution plates is shown in the figure, and 1-4 blocks can be selectively added at the adding positions of the hole air distribution plates, so that four adding schemes are totally adopted.
Step 5.2: respectively performing fluid domain modeling on the tube cavities of the 4 schemes in the step 5.1 by using three-dimensional design software, and then performing discretization processing on the fluid domains by using gridding processing software GAMBIT;
step 5.3: setting boundary conditions for the fluid domain subjected to discretization processing in the step 5.2 by using fluid simulation software Fluent, setting a motion control equation and a power control equation threshold which are completely consistent with those of iterative operation in the step 3 and setting a threshold of an energy equation, performing iterative solution by using the fluid simulation software Fluent, introducing a solution result into visual post-processing software Tecplot for post-processing, and displaying and analyzing a flow field operation result;
step 5.4: comparing the flow field operation results of the tube cavities with different addition schemes in the step 5.1, wherein the addition scheme with the best optimization effect is that four plane hole air distribution plates are added in the tube cavities, the flow field in the tube cavities is uniform, and no vortex phenomenon exists, so that the air inlet pipeline system of the gravure press oven with the adjusted tube cavity structure is determined as the final design structure of the air inlet pipeline system of the oven.
Example 4
The embodiment provides an optimal design method for an air inlet pipeline system of a gravure press oven, which is implemented according to the following steps:
step 1: designing the structure of an air inlet pipeline system of the drying oven according to the space of the gravure press, the size of the drying oven body and the type selection of the fan, and determining the structures of the heater, the air inlet pipe, the air return pipe and the pipe cavity part;
step 2: modeling the fluid domain of the air inlet pipeline system designed in the step 1 by using three-dimensional design software, wherein the model is shown in figure 5, and then discretizing the fluid domain by using gridding processing software GAMBIT;
and step 3: setting boundary conditions for the fluid domain subjected to discretization processing in the step 2 by using fluid simulation software Fluent, performing iterative solution, guiding a solution result into visual post-processing software Tecplot for post-processing, and displaying and analyzing a flow field operation result by obtaining a trace diagram of an oven air inlet pipeline system, wherein the color of the line of the trace diagram represents the speed, the cooler the hue is, the warmer the hue is, and the denser the hue is, the more the warmer the hue is, the more the volume of the air volume is represented by the density of the line;
and 4, step 4: performing flow field analysis according to the trace diagram obtained in the step 3, and selecting a bent pipe and a pipe cavity structure with obvious vortex characteristics;
and 5: and (4) respectively carrying out structure optimization on the bent pipe and the pipe cavity structure selected in the step (4), wherein the specific technical process is shown in the step (5) of the embodiment 1 and the step (5) of the embodiment 3, and the final optimized structure is used for determining the final design structure of the oven air inlet pipeline system.
Claims (6)
1. The optimization design method of the air inlet pipeline system of the gravure press oven is characterized by comprising the following steps:
step 1: designing a structure of an oven air inlet pipeline system according to the space of the gravure press, the size of an oven body and the type selection of a fan, wherein the oven air inlet pipeline system comprises a heater, an air inlet pipe, an air return pipe and a pipe cavity, and determining the structures and the sizes of the heater, the air inlet pipe, the air return pipe and the pipe cavity, or directly obtaining the structure of the oven air inlet pipeline system to be optimized from an enterprise;
step 2: modeling the fluid domain of the air inlet pipeline system designed in the step 1 by using three-dimensional design software, and then discretizing the fluid domain by using gridding processing software;
and step 3: setting boundary conditions for the fluid domain subjected to discretization processing in the step 2 by using fluid simulation software, setting a motion control equation and a power control equation threshold value of iterative operation and a threshold value of an energy equation, performing iterative solution by using the fluid simulation software, importing a solution result into visual post-processing software for post-processing, and displaying and analyzing a flow field operation result;
and 4, step 4: performing flow field analysis according to the flow field analysis result in the step 3, and selecting a component with obvious vortex characteristics;
and 5: performing structural optimization on the member selected in the step 4, and determining the final design structure of the oven air inlet pipeline system;
the specific operation contents of the step 4 and the step 5 are three types:
the first method comprises the following steps: step 4 is specifically to perform flow field analysis according to the flow field analysis result of step 3, and select the bent pipe with obvious vortex characteristics;
the step 5 is specifically that the step of the method is that,
step 5.1: preliminarily determining different adding schemes for adding the cambered surface guide plate in the bent pipe;
step 5.2: respectively utilizing three-dimensional design software to model the fluid domains of the bent pipes with different addition schemes, and then utilizing gridding processing software to carry out discretization processing on the fluid domains;
step 5.3: setting boundary conditions for the fluid domain subjected to discretization in the step 5.2 by using fluid simulation software, setting motion control equation and power control equation thresholds which are completely consistent with those of iterative operation in the step 3 and thresholds of energy equations, performing iterative solution by using the fluid simulation software Fluent, introducing a solution result into visual post-processing software for post-processing, and displaying and analyzing a flow field operation result;
step 5.4: comparing flow field operation results of the bent pipes of different adding schemes in the step 5.1, selecting an adding scheme which has uniform flow field inside the bent pipe and does not have a vortex phenomenon, and determining the gravure press oven air inlet pipeline system with the bent pipe structure adjusted according to the scheme as a final design structure of the oven air inlet pipeline system;
and the second method comprises the following steps: step 4 is specifically to perform flow field analysis according to the flow field analysis result of step 3, and select a funnel-shaped pipeline with obvious vortex characteristics;
the step 5 is specifically that the step of the method is that,
step 5.1: the method comprises the following steps of (1) carrying out equal-area separation on the interior of a funnel-shaped pipeline by adding criss-cross planar air homogenizing plates, and preliminarily determining different adding schemes;
step 5.2: respectively utilizing three-dimensional design software to model the funnel-shaped pipelines with different addition schemes in a fluid domain mode, and then utilizing gridding processing software to carry out discretization processing on the fluid domain;
step 5.3: setting boundary conditions for the fluid domain subjected to discretization in the step 5.2 by using fluid simulation software, setting motion control equation and power control equation thresholds which are completely consistent with those of iterative operation in the step 3 and thresholds of energy equations, performing iterative solution by using the fluid simulation software Fluent, introducing a solution result into visual post-processing software for post-processing, and displaying and analyzing a flow field operation result;
step 5.4: comparing the flow field operation results of the bent pipes with different addition schemes in the step 5.1, selecting an addition scheme which has uniform flow field in the funnel-shaped pipeline and does not have the eddy phenomenon, and determining the gravure press oven air inlet pipeline system with the funnel-shaped pipeline added with the air homogenizing plate in the scheme as the final design structure of the oven air inlet pipeline system;
and the third is that: step 4 is specifically to perform flow field analysis according to the flow field analysis result of step 3, and select a tube cavity with obvious vortex characteristics;
the step 5 is specifically that the step of the method is that,
step 5.1: preliminarily determining different adding schemes of adding a plane hole air homogenizing plate in the tube cavity, wherein circular holes which are uniformly arranged at equal intervals are formed in the plane hole air homogenizing plate;
step 5.2: respectively carrying out fluid domain modeling on the lumens of different adding schemes by using three-dimensional design software, and then carrying out discretization treatment on the fluid domains by using gridding treatment software;
step 5.3: setting boundary conditions for the fluid domain subjected to discretization in the step 5.2 by using fluid simulation software, setting motion control equation and power control equation thresholds which are completely consistent with those of iterative operation in the step 3 and thresholds of energy equations, performing iterative solution by using the fluid simulation software Fluent, introducing a solution result into visual post-processing software for post-processing, and displaying and analyzing a flow field operation result;
step 5.4: and (5) comparing flow field operation results of the bent pipes with different adding schemes in the step 5.1, selecting an adding scheme which has uniform flow field in the pipe cavity and does not have a vortex phenomenon, and determining the air inlet pipeline system of the gravure press oven with the adjusted pipe cavity structure of the scheme as a final design structure of the air inlet pipeline system of the oven.
2. The method of claim 1, wherein the set boundary conditions include velocity and temperature at the velocity inlet, static pressure at the pressure outlet, wall conditions, and computational models.
3. The optimal design method of the gravure press oven air inlet duct system according to claim 1, wherein the discretization of the fluid domain by using the gridding software is specifically to introduce a fluid model into the gridding software for gridding, the main body adopts a tetrahedral grid, the connection area adopts a mixed grid of a hexahedron, a wedge and a cone grid for dividing, and the local part is encrypted and divided.
4. The method of claim 1, wherein the grid processing software uses gamma bit.
5. The method for optimally designing the air inlet pipeline system of the gravure press oven according to claim 1, wherein the fluid simulation software adopts Fluent.
6. The method of claim 1, wherein the visual post-processing software is Tecplot.
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