CN115640767A - Modeling and simulation method of ship hull outer plate spray paint mist vacuum recovery system based on CFD - Google Patents
Modeling and simulation method of ship hull outer plate spray paint mist vacuum recovery system based on CFD Download PDFInfo
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Abstract
The invention provides a modeling and simulation method of a ship hull outer plate spray paint mist vacuum recovery system based on CFD, which comprises the following steps: establishing a three-dimensional model of a ship hull plate spraying paint mist vacuum recovery system; dividing grids; defining a numerical simulation model; running calculation; extracting an effect evaluation index; adjusting spraying and paint mist recovery control parameters, and performing paint mist vacuum recovery simulation again; improving the structural size of the recovery system, and carrying out modeling and simulation again on the paint mist recovery system; and obtaining a better spraying and paint mist recovery control parameter combination and recovery system design scheme until the paint mist recovery requirement is met. The method has the advantages of low cost, high efficiency, good repeatability and the like, is suitable for the paint mist recovery and modification requirements of the existing equipment in the current shipyard spraying, can improve the green environmental protection index of equipment by applying the current spraying control parameters to the modification design of a spraying system, is convenient for optimizing the control parameter sets of the spraying and paint mist recovery system after modification, and is very wide in application.
Description
Technical Field
The invention relates to the technical field of spraying control of hull plates and green shipbuilding, in particular to a modeling and simulation method of a CFD-based hull plate spraying paint mist vacuum recovery system.
Background
With the gradual implementation of national intelligent manufacturing strategy and the deep development of technology, green shipbuilding and intelligent shipbuilding in the field of ship industry become important directions for shipbuilding development, the diffusion of toxic paint mist such as marine organisms and the like in the spraying process of outer plates of ship hulls not only causes paint waste, but also causes serious pollution to docks and seawater, the toxic paint mist comprises highly-granulated solvents and solid particles, such as pollutants such as aromatic hydrocarbon, alcohol, ketone, ester, resin and the like, has the characteristics of high concentration, high toxicity, flammability, explosiveness and the like, and the paint mist diffused into the air can also pollute equipment and the surrounding environment and seriously harm the physical health of workers. Therefore, in the process of carrying out the intelligent reconstruction of the robot of the spraying construction equipment for the outer plates of the ship hulls in the dock, the automatic recovery of the paint mist is particularly important.
At present, the paint mist recovery system for the hull planking spraying operation that the robot carried on is studied less, and relevant research mainly focuses on the paint mist in workshop and handles, generally fails to carry out the recovery processing of paint mist among the actual spraying operation of shipyard, and a large amount of paint mist directly dissipate to the air or deposit on worker's protective clothing and overhead car. The deep reason of the above phenomena is that although various manual or automatic hull plate spraying devices are abundant, most spraying systems do not have the same paint mist recovery function, and it is known through research that currently mainstream paint mist recovery methods include activated carbon adsorption, vacuum recovery, water curtain recovery, electrostatic recovery, and the like. The adsorption mode of the activated carbon is common, but the recycling rate of the used material is low, and the separation of the paint mist after adsorption is inconvenient; the water curtain recovery, distillation and separation of solids are complex, are limited by the characteristics of the water curtain recovery, distillation and separation of solids, and are not suitable for recovering paint mist of outdoor ship outer plates; electrostatic recycling requires the paint to have a resistive property, requires the recycling system to be grounded well, and therefore has a limited application range. Therefore, the recovery method has the defects of simple working principle of vacuum recovery, wide application range of paint, convenient selection of the industrial air suction pump and low energy consumption to a certain extent, and related equipment can be carried on an overhead vehicle or a wall climbing robot, so that the recovery of the spraying paint mist of the hull plate becomes possible. Although a great deal of concept design is carried out on the ship hull outer plate spraying system with the paint mist recycling function by domestic and foreign research institutes, the prototype production and test application have a certain distance.
Disclosure of Invention
The invention aims to provide a modeling and simulation method of a ship hull plate spraying paint mist vacuum recovery system based on CFD, which utilizes a modeling method to optimally select a spraying and recovery control parameter combination and a design scheme of a recovery system through multiple times of low-cost numerical simulation so as to overcome the defects of the prior art and the like.
The invention provides a modeling and simulation method of a ship hull outer plate spray paint mist vacuum recovery system based on CFD, which comprises the following steps: establishing a three-dimensional model of a ship hull plate spraying paint mist vacuum recovery system, wherein the vacuum recovery system comprises a recovery cover; dividing a grid model according to the three-dimensional model of the vacuum recovery system; defining a numerical simulation model for the hull plate spraying, comprising: the method comprises the following steps of (1) defining incident information of a virtual nozzle, coupling action of a continuous phase and a discrete phase, atomization control of paint liquid drops and trajectory tracking of atomized particles; performing operation calculation, namely performing simulation post-processing and analysis on the spraying and paint mist recovery processes of the hull plate by utilizing a CFD (computational fluid dynamics) technology according to the boundary conditions and the numerical simulation model;
extraction effect evaluation index: the control parameters are adjusted or the design scheme of the recovery system is improved, so that the work of the recovery system meets the expected paint mist recovery requirement; according to whether the simulation result and the recovery index meet the expected paint mist recovery requirement or not, firstly adjusting spraying and paint mist recovery control parameters, and re-performing paint mist vacuum recovery simulation; if the expected paint mist recycling requirement is not met, modeling and simulation of the paint mist recycling system are carried out again in a larger range by improving the structural size of the recycling system; and (3) obtaining a better spraying and paint mist recovery control parameter combination and recovery system design scheme until the paint mist recovery requirement is met, trial-manufacturing a prototype according to the adjusted paint mist recovery control parameter and recovery system scheme, and providing guidance for equipment modification in the actual spraying operation.
The boundary conditions of the recovery hood model include continuous phase boundary elements and discrete phase boundary elements.
The continuous phase boundary element is used for controlling the movement of a gas phase in the recovery hood model and comprises a continuous phase boundary of an air inlet surface, a continuous phase boundary of an air suction surface, a wall surface boundary of the recovery hood and a spraying outer plate boundary.
The continuous phase boundary type of the air inlet surface of the recovery cover is a pressure inlet, and the value of the continuous phase boundary type is consistent with the local atmospheric pressure, so that the air inlet surface of the recovery cover is directly communicated with the atmosphere.
The continuous phase boundary type of the air suction surface of the recovery cover is a pressure outlet, the continuous phase boundary type on the air suction surface is set as the pressure outlet in order to realize vacuum recovery, the pressure value is determined by the local atmospheric pressure and the vacuum degree value, according to the vacuum recovery principle of paint mist, the actual pressure value on the air suction surface is equal to the difference between the local atmospheric pressure and the set vacuum degree, and simulation is realized by the vacuum recovery of the paint mist.
The discrete phase boundary element is used for determining the track information of particles reaching the boundary of the calculation domain in spraying and paint mist recovery, and comprises three conditions of escape discrete phase boundary, adhesion discrete phase boundary and deposition discrete phase boundary.
The paint mist escape discrete phase boundary type is used for determining trajectories on an air inlet surface and an air inlet surface of the recovery cover model, and represents that the trajectories of the particles are stopped tracking after the particles reach the boundary, so that the particles are considered to escape and disappear from a calculation domain.
The paint mist adhesion discrete phase boundary type is used for determining a track on the wall boundary of the recovery cover model, shows that the particles are adhered when reaching the wall of the recovery cover, and simultaneously stops tracking the paint mist particles.
The paint mist deposition discrete phase boundary type is used for determining the trajectory of the ship hull plate in the recovery cover model, and represents that particles are deposited through a crushing part, a splashing part and an expanding part when reaching the ship hull plate, wherein the splashing part paint mist moves in the recovery cover, and the trajectory tracking of the particles on the boundary is still continued.
The incident information of the virtual nozzle in the step S3 comprises the type of the virtual nozzle, the incident amount control of the coating in unit time, and the position and size information of the virtual nozzle; the coupling action of the continuous phase and the discrete phase adopts bidirectional coupling; and the atomization control of the coating liquid drops is controlled by selecting an atomization model according to the type of the nozzle and a corresponding jet flow crushing mechanism.
According to the modeling and simulation method of the CFD-based ship hull plate spraying paint mist vacuum recovery system, the processes of paint atomization and paint mist recovery are simulated through a computer, and the effect of paint mist vacuum recovery can be evaluated according to comparison of the spraying simulation results of the ship hull plate with or without paint mist recovery. Different paint mist vacuum recovery systems can be modeled through recovery simulation and modeling processes, designers can accurately know the technical difficulty and key control parameters of the recovery systems through simulation before trial-manufacturing and testing of a prototype, optimization and improvement of recovery system control and scheme design are facilitated, and the method has the advantages of low cost, high efficiency, good repeatability and the like. In addition, the current spraying control parameters are used in the refitting design of the spraying system aiming at the paint mist recovery refitting requirement of the existing equipment in the current shipyard spraying, so that the green environmental protection index of the equipment can be improved, and the control parameter group of the refitted spraying and paint mist recovery system is convenient to optimize.
Drawings
Fig. 1 is a flowchart of an embodiment of a CFD-based ship hull plate spray paint mist vacuum recovery system modeling and simulation method provided by the present invention.
Detailed Description
The invention CFD: for Computational Fluid Dynamics (CFD) all equations are assembled by dividing the area of the Fluid under investigation (gas or liquid) into a suitable number of two-or three-dimensional grid cells, discretizing the mass-conservation equations, momentum-conservation equations, energy-conservation equations and additional turbulence equations onto each cell using finite element or finite volume methods, and then solving all equations in a matrix operation over the entire domain.
Referring to fig. 1, fig. 1 is a flowchart illustrating an embodiment of a CFD-based ship outer panel paint mist vacuum recycling simulation and modeling method according to the present invention. In fig. 1, step S1 represents establishing a three-dimensional model of a paint mist recovery system calculation domain, where the three-dimensional model of the paint mist vacuum recovery system calculation domain includes an air intake surface, an air suction surface, a recovery cover and a spray outer plate, and according to the vacuum recovery principle, the boundary of the paint mist recovery system model needs to form a complete enclosure, i.e., the complete enclosure must include four basic parts, i.e., the air intake surface, the air suction surface, the recovery cover and the spray outer plate, and according to the actual working requirements of the recovery system, the model should include an industrial air suction pump, an air suction pipeline, a heating device, a storage device, etc., and a suitable design size needs to be drawn up according to the actual spraying operation information of the hull outer plate, such as the number of spray guns, the paint material, the device size, etc.
The step S2 represents dividing the mesh model according to the recovery system model, and aims to map the calculation model to the geometric model so as to facilitate the solution of the relevant variables in the CFD paint mist recovery simulation. In addition, the flow field carries out grid division on the requirement of grid precision; to ensure the accuracy of the simulation, the grid at the nozzle is encrypted; and carrying out grid independence test to ensure that the result obtained by calculation is not influenced by the precision of the grid.
The step S3 represents defining a numerical model of the ship hull plate spraying simulation, including starting a turbulence model, a discrete phase model, boundary conditions, defining incident information of a virtual nozzle, setting coupling between a continuous phase and a discrete phase, controlling atomization of paint droplets, tracking trajectory of atomized particles, and the like, which may be completed based on common CFD software such as fluent, and the like. In the spraying of the hull plate, when high-pressure paint is injected into the atmosphere through a nozzle, the pressure is suddenly released, the fluid generates unstable fluctuation due to the pneumatic interference force between the jet flow and the surrounding air, and the length of the surface acted by the unstable fluctuation is shorter and shorter along with the increase of the fluid speed until the atomization becomes micron-sized and dispersed. Since atomization of the paint involves two fluids with different properties, namely gas and paint, a discrete phase model needs to be started, and bidirectional coupling solution is carried out between continuous phase gas and discrete phase liquid drops. In CFD software, according to the shape and the atomizing property of a spraying fan surface in the ship hull plate spraying, an appropriate incident source (namely a virtual nozzle) type is selected and the emergent flow is defined. In addition, in the simulation, a proper atomization model is selected according to the atomization mechanism of the coating, and atomization parameters are set. In order to facilitate the statistics of the paint mist information on each boundary, the trajectory tracking of the atomized particles is set. In the setting of the boundary conditions, the boundary elements of the boundary components of the paint mist recovery system, namely the air inlet surface, the air suction surface, the recovery cover and the spraying outer plate boundary, can be divided into two types of continuous phase boundary elements and discrete phase boundary elements according to the fluid properties. The continuous phase boundary element is used for controlling the movement of the gas phase in the recovery hood model, so that the continuous phase boundary type of the air inlet surface is set as a pressure inlet, the pressure value is local atmospheric pressure, the continuous phase boundary type of the air suction surface is set as a pressure outlet, the pressure value is the difference between the local atmospheric pressure and the set vacuum degree, and the continuous phase boundary type of the recovery hood and the spraying outer plate is wall surface, namely gas impenetrable. To simulate the spray gun movement, the virtual nozzle (i.e., the source of incidence) and the recovery hood remain relatively stationary, and the spray outer panel and the remainder remain relatively moving, at a speed set to simulate the spray velocity, which is set in accordance with the motion conversion principle. The discrete phase boundary elements of the recovery system boundary are used for determining the trajectory fate of particles in spraying and paint mist recovery when the particles reach the boundary of a calculation domain, and are divided into three types of escape, adhesion and deposition. The paint mist escape discrete phase boundary type is used for determining trajectories on an air inlet surface and an air inlet surface of the recovery cover model, and represents that the trajectory of the particles is stopped after the particles reach the boundary, and the particles are considered to escape and disappear from the calculation domain. The paint mist adhesion discrete phase boundary type is used for determining a track on the wall boundary of the recovery cover model, represents that the particles are adhered when reaching the wall of the recovery cover, and simultaneously terminates the track tracking of the paint mist particles. The paint mist deposition discrete phase boundary type is used for determining the track on the hull outer plate in the recovery cover model, and shows that the paint mist of the splashed part moves in the recovery cover after being partially deposited by crushing, splashing, expanding and the like when the particles reach the hull outer plate, and the track tracking of the particles on the boundary is still continued.
And (4) after the data preparation steps from the step (S1) to the step (S3) are finished, performing operation of the step (S4), namely simulating vacuum recovery of the paint mist sprayed on the hull plate. The mathematical basis of the CFD simulation calculation is to solve the mass conservation equation, momentum conservation equation and energy conservation equation of the air in the greenhouse and the turbulence equation. And outputting the environmental index calculation value of the monitoring point according to the set time interval. In this example, the mass conservation equation, momentum conservation equation, and energy conservation equation and turbulence equation are used as follows:
mass conservation equation:
conservation of momentum equation:
the momentum equation, i.e. the Navier-Stokes equation, whose vector under the inertial reference system is expressed as
Energy conservation equation:
turbulence equation:
according to the ship hull plate spray paint mist recovery simulation, influences of factors such as temperature, radiation, evaporation and gas compressibility are not considered, so that the solution of an energy conservation equation can be omitted in CFD simulation, the velocity field and the pressure field of continuous phase gas can be obtained through the solution of the equation, variable information obtained through the continuous phase solution is used for the solution of discrete phase motion, the motion of the continuous phase is corrected by using the result of the discrete phase solution, the bidirectional coupling single iteration calculation of the continuous phase and a discrete term is completed, and after the iteration calculation is completed, the iteration calculation is performed again alternately according to the continuous phase solution and the discrete phase solution.
In addition, a discrete phase model is started according to the requirement in the numerical simulation of paint spraying, and related theories comprise particle motion tracking, a resistance law, a liquid film theory, a particle erosion and deposition theory, an atomization model theory, a secondary crushing theory, a particle collision and combination theory, a two-phase coupling theory and the like. Here, only the mathematical model of the particle force balance is listed
In the formula, m p Is the mass of the particles;
is the velocity of the continuous phase;
is the particle velocity; ρ is the density of the continuous phase; ρ is a unit of a gradient p Is the density of the particles;
is an additional force;
is the particle drag force; tau. r Is the relaxation time of the particle.
Other relevant theories and control equations may be obtained from the user help file of the CFD calculation software.
And the step S5 represents that after the paint mist recovery simulation is finished, the simulation result is taken to carry out post-treatment to obtain an evaluation index of the recovery effect, and the evaluation index can adopt the utilization rate of the coating, the escape ratio of the paint mist, the recovery working efficiency, the average thickness of the liquid film, the thickness uniformity index air suction quantity and the combination thereof. In order to conveniently evaluate the effect of the paint mist vacuum recovery system, in the recovery stable stage, the actual utilization rate of the paint and the escape, absorption and attachment proportions on the air inlet surface, the air suction surface and the wall surface of the recovery cover can be calculated according to the spraying time, the paint deposition quality on the hull plate and the statistical quality of the paint mist on each boundary.
In this embodiment, at the designated time of the stable paint mist recovery stage, the paint utilization rate in the hull plate spraying simulation can be calculated by the following mathematical model according to the flow setting of the virtual spraying and the paint deposition quality on the sprayed outer plate:
utilization rate eta of coating 1 In units of%
Wherein m is wallfilm mass The quality of the deposition liquid film obtained by simulation; m is a unit of total mass The theoretical total mass of the spray at the current moment.
In the coating deposition and mist recovery stabilization stage, the coating utilization rate is obtained through calculation according to the formula, so that the effective utilization rate of the coating under the condition of the current control parameters can be measured. Besides normal paint splashing, improper setting of air suction negative pressure and the like in paint mist recovery can cause the actual utilization rate of the paint to be reduced, so that a reasonable paint utilization rate range is set in an expected paint mist recovery index through investigation and research, and if the simulated paint utilization rate is in the range, the influence of the paint mist recovery on the utilization rate of the paint can be accepted.
Escape ratio omega of paint mist 1 Of, singlyThe bit is%.
The working efficiency of the paint mist recovery system is eta 2 In units of%
Wherein m is 1 The unit kg is the escaping mass of the paint mist; m is 2 The unit kg is the attached mass of the paint mist; m is 3 The unit kg is the paint mist absorption mass; coefficient k 1 、k 2 Reflecting the effect of the paint mist deposited on the recovery cover and absorbed by the recovery pump on the recovery efficiency of the paint mist, wherein the coefficient k is used for enhancing the effect of the absorbed paint mist on the recovery efficiency of the paint mist 2 Should be greater than k 1 . For the sake of simple calculation, the influence of both on the recovery efficiency was ignored, and both values were taken as 1.
And according to the result of the paint mist recovery simulation, calculating to obtain the utilization rate and other recovery evaluation indexes of the paint, and evaluating whether the expected recovery effect is achieved. On the basis of ensuring the actual utilization rate of the coating, in a plurality of recovery schemes, the selected recovery work efficiency is high, the escape proportion of the coating mist is low, the deposition of a liquid film is stable and uniform, and the air suction volume is made to be as small as possible so as to reduce the power consumption of a recovery system.
And the step S6 represents that when the recycling evaluation index does not meet the expected recycling requirement, the control parameters of spraying and paint mist recycling are adjusted. The control parameters that can be adjusted include the spray pressure, spray distance, suction negative pressure, etc. According to the paint mist proportion, speed information, internal flow field distribution and the like on different boundaries in simulation, a reasonable optimization direction is determined, finer adjustment is performed on the basis, on the premise that the coating rate is ensured, the proportion of escaping paint mist on the air inlet surface is reduced, the proportion of paint mist recovery on the air inlet surface is increased, the air suction amount is reasonably controlled to limit energy consumption, and therefore the effect of paint mist vacuum recovery is maximized.
Step S7 represents the structural dimensioning of the improved paint mist recovery system. And step S6, after the control parameters are adjusted, the paint mist vacuum recovery simulation is carried out again, and if the recovery effect is still not ideal, the structure and the size of the paint mist vacuum recovery system need to be adjusted in a larger range. And (3) optimizing the structure and the size of the recovery system by analyzing the paint mist recovery simulation result, and simulating the optimized paint mist recovery system again by utilizing the modeling and simulation method according to the steps S1 to S6. According to the paint mist recovery principle, the distance between a recovery cover and a spraying outer plate in a recovery system and the number and area of air suction holes can be adjusted to change the area ratio of an air suction surface to an air inlet surface, so that the flow velocity on the two surfaces and the distribution of internal flow fields are changed. In addition, the recycling system can be optimized by changing the arrangement position of the air suction holes, changing the structure of the recycling system and the like.
And step S8 represents that a group of optimized spraying and paint mist recycling control parameters and a recycling system obtained according to the steps S1-S6 can provide guidance for selection of control parameters and optimization design of a recycling cover in actual spraying.
It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention in a schematic manner, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in the actual implementation, and the type, quantity and proportion of the components in the actual implementation may be changed arbitrarily, and the layout of the related components may be more complicated. The modeling and simulation method for the ship hull plate spraying paint mist vacuum recovery system based on CFD provided by the invention utilizes the CFD technology and the discrete phase model to simulate the velocity field and the pressure field of continuous phase gas and discrete phase particles, and sets the suction pressure under different vacuum degrees by changing the continuous phase boundary condition on the suction surface in the CFD calculation so as to flexibly simulate the paint mist vacuum recovery under different negative pressure conditions. By utilizing the paint mist recovery simulation under different vacuum recovery working conditions, the influence of each control parameter, particularly the set vacuum degree value, can be analyzed, and the selection of a proper recovery control parameter combination is facilitated. In addition, the paint mist vacuum recovery modeling and simulation method can simulate recovery systems with different structural forms, and provides guidance for scheme design of the paint mist recovery system. The method can save time and reduce capital cost, so that researchers can research control parameters and technologies in paint mist recovery numerical simulation, and can obtain a better control parameter combination and recovery system design scheme through multiple times of low-cost CFD numerical simulation, so that the method is used for developing ship hull plate spraying and paint mist vacuum recovery systems, can save prototype manufacturing and testing costs, and is very wide in application.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (10)
1. A modeling and simulation method of a ship hull outer plate spray paint mist vacuum recovery system based on CFD is characterized by comprising the following steps:
s1, establishing a three-dimensional model of a ship hull plate spraying paint mist vacuum recovery system, wherein the vacuum recovery system comprises a recovery cover, an air inlet surface, an air suction surface and a spraying outer plate.
S2, dividing grids;
s3, defining a numerical simulation model, wherein the numerical simulation model comprises the following steps: discrete phase models, turbulence models, boundary conditions, virtual nozzles and their related information; the method specifically comprises the steps of defining incident information of a virtual nozzle, coupling action of a continuous phase and a discrete phase, atomization control of paint droplets and trajectory tracking of atomized particles;
s4, running calculation: carrying out simulation post-processing and analysis on the spraying and paint mist recovery processes of the hull plate by utilizing a CFD (computational fluid dynamics) technology according to the boundary conditions and the numerical simulation model;
s5, extracting effect evaluation indexes: the work of the recovery system meets the expected paint mist recovery requirement by adjusting control parameters or improving the design scheme of the recovery system;
s6, according to whether the simulation result and the recovery index meet the expected paint mist recovery requirement or not, firstly adjusting spraying and paint mist recovery control parameters, and re-performing paint mist vacuum recovery simulation;
s7, if the expected paint mist recovery requirement is not met, modeling and simulating the paint mist recovery system again through improving the structural size of the recovery system in a larger range;
and S8, obtaining a better spraying and paint mist recovery control parameter combination and recovery system design scheme until the paint mist recovery requirement is met.
2. The CFD-based method for simulating and modeling a vacuum recycling system for paint mist spraying of an outer hull plate based on a CFD of claim 1, wherein the boundary conditions of the recycling cover model comprise continuous phase boundary elements and discrete phase boundary elements.
3. The CFD-based method for simulating and modeling a vacuum recycling system for paint mist spraying of an outer hull plate based on claim 2, wherein the continuous phase boundary elements are used for controlling the movement of a gas phase in the recycling cover model, and comprise a continuous phase boundary of an air inlet surface, a continuous phase boundary of an air suction surface, a wall surface boundary of the recycling cover and a boundary of the outer hull plate to be sprayed.
4. The CFD-based ship hull plate paint spray vacuum recovery system simulation and modeling method according to claim 3, wherein the continuous phase boundary type of the air inlet surface of the recovery hood is a pressure inlet, and the value of the continuous phase boundary type is consistent with the local atmospheric pressure, so as to indicate that the air inlet surface of the recovery hood is directly communicated with the atmosphere.
5. The CFD-based ship hull plate paint mist spraying vacuum recovery system simulation and modeling method according to claim 3, wherein the continuous phase boundary type of the recovery cover suction surface is a pressure outlet, and the actual pressure value on the suction surface is equal to the difference between the local atmospheric pressure and the set vacuum degree according to the vacuum recovery principle of paint mist.
6. The CFD-based hull plate spray paint mist vacuum recycling simulation and modeling method according to claim 2, wherein the discrete phase boundary elements are used for determining trajectory information of particles in spray coating and paint mist recycling when the particles reach the boundary of the calculation domain, and the trajectory information comprises three conditions of escape discrete phase boundary, adhesion discrete phase boundary and deposition discrete phase boundary.
7. The CFD-based ship hull plate paint mist spraying vacuum recycling system simulation and modeling method according to claim 6, wherein the paint mist escape discrete phase boundary type is used for determining trajectories on an air inlet surface and an air inlet surface of a recycling cover model, and represents that after the particles reach the boundary, the tracking of the particle trajectories is stopped, and the particles are considered to escape and disappear from a calculation domain.
8. The CFD-based ship hull plate spray paint mist vacuum recycling system simulation and modeling method according to claim 6, wherein the paint mist adhesion discrete phase boundary type is used for determining a trajectory on a recycling cover model wall surface boundary, and represents that adhesion occurs when particles reach the recycling cover wall surface, and meanwhile trajectory tracking of paint mist particles is stopped.
9. The CFD-based ship hull plate paint spray vacuum recovery system simulation and modeling method according to claim 6, wherein the paint mist deposition discrete phase boundary type is used for determining the trajectory of the ship hull plate in the recovery cover model, and represents that the particles are deposited through the crushing, splashing and expanding parts when reaching the ship hull plate, wherein the splashing part paint mist moves in the recovery cover, and the trajectory tracking of the particles on the boundary is still continued.
10. The CFD-based ship hull plate paint spray vacuum recycling system simulation and modeling method according to claim 1, wherein the incident information of the virtual nozzle in the S3 step comprises the type of the virtual nozzle, the incident amount control of the paint in unit time, the position and the size information of the virtual nozzle; the coupling action of the continuous phase and the discrete phase adopts bidirectional coupling; and the atomization control of the coating liquid drops is controlled by selecting an atomization model according to the type of the nozzle and a corresponding jet flow crushing mechanism.
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