A condensed phase explosive fuel volume detonation process calculation model and construction method

Abstract

The application provides a condensed-phase explosive fuel volume explosion process calculation model and a construction method, and the construction method comprises the following steps: step 201, overall setting; step 202, VOF multiphase flow model setting; step 203, turbulent flow model setting; step 204, discrete particle combustion model setting; step 205, component chemical reaction model setting; and step 206, local initialization setting. The model construction method of the application uses Fluent fluid mechanics simulation software, stimulates the chemical reaction of a composite liquid-solid explosive fuel component, realizes numerical simulation of the volume explosion process of the condensed-phase explosive fuel, describes the volume explosion process through local initialization and the component chemical reaction model, has clear ideas and clear levels, can obtain accurate calculation results, and satisfies the calculation model meeting the actual engineering application requirements. The calculation model of the application can stimulate the chemical reaction of the composite liquid-solid explosive fuel under the precondition of obtaining the condensed-phase explosive fuel scattering distribution form, can clearly describe the change law of the volume explosion process of the condensed-phase explosive fuel.

Description

Technical Field

[0001] This invention belongs to the field of high-energy explosives technology, and relates to condensed phase explosives, specifically to a calculation model and construction method for the fuel volume detonation process of condensed phase explosives. Background Technology

[0002] When condensed-phase explosive fuels exert their combat effectiveness, it typically involves two sequential phases: a dispersion and diffusion process and a volumetric detonation process. The primary targets for condensed-phase explosive fuels in combat are area targets, including various types of unprotected light vehicles, simple fortifications, and densely populated populations. To fully unleash the destructive power of the volumetric detonation process of condensed-phase explosive fuels, a favorable and suitable dispersion and diffusion distribution pattern is a crucial prerequisite. Based on this, a computational model and numerical simulation analysis of the volumetric detonation process of condensed-phase explosive fuels are constructed to comprehensively understand the chemical reaction processes between the components of the composite liquid-solid fuel, deeply reveal the flow field evolution characteristics of the volumetric detonation process, and fully grasp the physical mechanisms of the detonation damage process. This will accumulate experience and reserve technology for the design and development of related weapons and ammunition products.

[0003] The volumetric detonation process of condensed-phase explosive fuels is a highly complex hydrodynamic problem involving the interactions between multiple physical fields, including flow, force, and chemical reactions. The challenge lies in the accurate simulation of the chemical reactions between different phase components of composite liquid-solid explosive fuels. Currently, simulation studies on the volumetric detonation process of condensed-phase explosive fuels are relatively limited. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a calculation model and construction method for the volumetric detonation process of condensed phase explosive fuel, and to solve the technical problem that the ability to describe and understand the volumetric detonation process of condensed phase explosive fuel in the existing technology needs to be further improved.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0006] A method for constructing a computational model of the volumetric detonation process of condensed phase explosive fuel, the method using Fluent numerical simulation software, wherein the condensed phase explosive fuel adopts a composite liquid-solid explosive fuel as the charge structure, and the method includes the following steps.

[0007] Step 201, Overall Settings.

[0008] Step 202, VOF multiphase flow model setup.

[0009] Step 203, Turbulence model settings.

[0010] Step 204, Setting up the discrete particle combustion model.

[0011] Step 205, setting up the component chemical reaction model.

[0012] Step 206, Local initialization settings.

[0013] The local initialization settings for the volumetric detonation process of condensed phase explosive fuel include the settings for the distribution morphology of condensed phase explosive fuel dispersion and the settings for the activation of condensed phase explosive fuel detonation reaction.

[0014] The present invention also has the following technical features.

[0015] Furthermore, the condensed phase explosive fuel dispersion distribution pattern is obtained using a calculation model of the condensed phase explosive fuel dispersion diffusion process. This model uses a numerical method based on the finite volume method to simulate and calculate the dispersion diffusion process of composite liquid-solid explosive fuel in the surrounding air environment under the action of the explosion driving force, thereby obtaining the condensed phase explosive fuel dispersion distribution pattern.

[0016] Furthermore, the method for constructing the computational model of the condensed phase explosive fuel dispersion and diffusion process includes the following steps.

[0017] Step 101: Simplified modeling of the charge structure.

[0018] Based on the charge structure of the composite liquid-solid explosive fuel, a geometric solid model of the flow field region during the dispersion and diffusion process of the condensed phase explosive fuel was constructed using 3D modeling software. The attribute names of the boundary regions of each component in the flow field region were set, and the geometric solid model of the flow field region was divided using mesh generation software to form a mesh model file of the dispersion and diffusion process of the condensed phase explosive fuel.

[0019] Step 102: Construction of a mathematical and physical model for the dispersion and diffusion process of condensed phase explosive fuel.

[0020] Using the mesh model file of the condensed phase explosive fuel dispersion and diffusion process formed in step 101, a mathematical and physical model of the condensed phase explosive dispersion and diffusion process is constructed using Fluent software. The flow field region is initialized to form an instance model file of the condensed phase explosive fuel dispersion and diffusion process.

[0021] The mathematical and physical model of the condensed phase explosive dispersion and diffusion process includes a basic framework, material parameters, a multiphase flow model, a turbulence model, and a discrete phase model.

[0022] Step 103: Setting up the control method for solving the diffusion process of condensed phase explosive fuel.

[0023] Based on the example model file of the condensed phase explosive fuel dispersion and diffusion process formed in step 102, and using the computational fluid dynamics numerical simulation method, a solution control method for the condensed phase explosive fuel dispersion and diffusion process is set up. This includes algorithm discretization and relaxation stability factor, display visualization and saving of calculation results, total calculation time and single-step time step. The solution control method is set up to form a data model file of the condensed phase explosive fuel dispersion and diffusion process. The simulation calculation of the condensed phase explosive fuel dispersion and diffusion process is then performed to obtain the calculation results.

[0024] Furthermore, the specific process of step 101 includes the following steps.

[0025] Step 10101: Modeling the structure of the fuel charge in the condensed phase explosive.

[0026] Step 10102: Model the surrounding air environment.

[0027] Step 10103: Model the geometric entity model of the flow field region.

[0028] Step 10104: Set the boundary attributes of the flow field region components.

[0029] Step 10105: Mesh generation of the geometric solid model of the flow field region.

[0030] Step 10106: Output the mesh model file of the condensed phase explosive fuel dispersion and diffusion process.

[0031] This invention also protects a calculation model for the volumetric detonation process of condensed-phase explosive fuel. This model is obtained by constructing the calculation model for the volumetric detonation process of condensed-phase explosive fuel described above. Under the premise of obtaining the dispersion distribution pattern of condensed-phase explosive fuel, this model induces a chemical reaction in composite liquid-solid explosive fuel to describe the volumetric detonation process of condensed-phase explosive fuel.

[0032] Compared with the prior art, the present invention has the following technical effects.

[0033] (I) The model construction method of the present invention uses Fluent fluid dynamics simulation software to stimulate the chemical reaction of composite liquid-solid explosive fuel components, thereby realizing the numerical simulation of the volume detonation process of condensed phase explosive fuel. The volume detonation process is described by local initialization and component chemical reaction model. The approach is clear and hierarchical, and the calculation results are accurate, meeting the needs of practical engineering applications.

[0034] (II) The calculation model of the present invention can, under the premise of obtaining the distribution pattern of condensed phase explosive fuel, induce chemical reaction of composite liquid-solid explosive fuel and clearly describe the change law of condensed phase explosive fuel volume detonation process.

[0035] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, all raw materials, equipment, software, equations, models and methods in this invention are based on materials, equipment, software, equations, models and methods known in the prior art.

[0037] The innovations of the calculation model and construction method for the volumetric detonation process of condensed phase explosive fuel in this invention are mainly reflected in the following aspects.

[0038] First, the volumetric detonation process of condensed phase explosive fuel should be based on the scattering and distribution pattern of condensed phase explosive fuel.

[0039] Specifically, whether a condensed-phase explosive fuel volumetric detonation process can occur, and the strength of the energy released after detonation, are particularly affected by the distribution pattern of the condensed-phase explosive fuel. This invention uses a designated cylindrical spatial region as a representative distribution pattern to perform intuitive and equivalent quantitative processing, ensuring that the condensed-phase explosive fuel volumetric detonation process definitely occurs, thus forming a complete technical solution.

[0040] Second, the volumetric detonation process of condensed phase explosive fuel is a complex process involving the interaction between flow structure and chemical reaction.

[0041] Specifically, condensed-phase explosive fuels typically employ composite liquid-solid explosive fuels as the typical charge structure. The size of a single composite liquid-solid explosive fuel charge structure is relatively limited, typically reaching 10... -1 The length dimension is m. Condensed phase explosive fuel, however, requires a length dimension of 10. 2 The volumetric detonation process of condensed-phase explosive fuels operates effectively within a spatial scale measured in m. From the perspective of characteristic length, the volumetric detonation process of condensed-phase explosive fuels is accompanied by turbulent flows of various forms and scales, requiring a matching turbulence model for description. The composite liquid-solid explosive fuels loaded in condensed-phase explosive fuels typically exhibit active physicochemical properties, possessing high volatility and flammability. From a material property perspective, the volumetric detonation process of condensed-phase explosive fuels clearly involves flow transitions between multiple phases (solid, liquid, and gas), necessitating the introduction of a multiphase flow model for characterization. Furthermore, the essence of the volumetric detonation process of condensed-phase explosive fuels is inseparable from the occurrence and evolution of chemical reactions. A synergistic and co-evolving interaction exists between the complex flow structure, including turbulence and multiphase flow models, and the chemical reactions.

[0042] Third, this invention uses the VOF (Volume of Fluid) multiphase flow model to describe the changing patterns of various fluid phases during the volume detonation of condensed phase explosive fuel.

[0043] Specifically, the VOF multiphase flow model is a surface tracking technique applied to a fixed Euler grid. This model is used for two or more immiscible fluids, where the interface location between the fluids is of interest. In the VOF multiphase flow model, all fluid phases share a set of momentum conservation equations. By solving a single set of momentum equations and tracking the volume fraction of each fluid throughout the computational domain, two or more immiscible fluids can be simulated.

[0044] Phase interface tracking is accomplished by solving continuity equations for the volume fractions of one or more phases. For the first... The equation has the following form:

[0045] ; In the formula, Indicates density; Indicates time; Indicates volume fraction; Indicates speed; subscript Indicates the first Mutually; Indicates from the first to the first Phase mass migration; Indicates from the first to the first Phase mass migration; Indicates an external term.

[0046] VOF (Volume-Oriented Fluid) multiphase flow models rely on the fact that two or more fluids are impermeable to each other. For each additional phase added to the model, a variable is introduced: the volume fraction of that phase in the computational cell. In each control volume, the volume fractions of all phases are summed to one. All variables and properties in the flow field are shared by all phases and represent volume averages, provided that the volume fraction of each phase is known at every location.

[0047] By using the VOF multiphase flow model, the flow transition process between solid, liquid and gas phases during the volumetric detonation of condensed explosive fuel can be effectively simulated.

[0048] Fourth, this invention uses the Large Eddy Simulation (LES) method to describe the complex turbulent flow process during the volumetric detonation of condensed phase explosive fuel.

[0049] Specifically, the large eddy simulation method, and the subgrid-scale model of wall-modeled large eddy simulation (WMLES) included therein, is one of the important technical methods for dealing with complex turbulent flow processes.

[0050] Large eddy simulation (LES) is a turbulence simulation method that lies between direct numerical simulation (DNS) and Reynolds-averaged numerical simulation (RANS). LES uses spatial filtering techniques to decompose instantaneous turbulent motion into directly analytical large-scale components and small-scale components that need to be modeled. Turbulent structures larger than the grid scale are solved directly, while small-scale components are modeled by establishing a sub-grid-scale model.

[0051] Using Fluent numerical simulation software, the Boussinesq assumption is introduced into the subgrid-scale turbulence model to describe the turbulent stress at the subgrid scale, which can be expressed in the following form: ; In the formula, Represents subgrid-scale turbulent stress; This represents the isotropic component of turbulent stress at the subgrid scale. Represents the turbulent viscosity at the subgrid scale; This represents the Kronecker delta symbol; This represents the strain rate tensor.

[0052] Within the subgrid scale being solved, the strain rate tensor can be expressed in the following form: ; In the formula, Represents velocity components; Represents coordinate components.

[0053] Large eddy simulation (Leddy simulation) methods include various forms of subgrid-scale models, with wall-modeled Leddy simulation being an important one. The WMLES subgrid-scale model is used to handle wall-constrained flows under high Reynolds number conditions. In the inner region near the wall, the flow characteristics of this region are simulated by introducing a RANS model or wall function, reflecting the small-scale and highly dissipative turbulence characteristics in the near-wall region.

[0054] The combined effect of these turbulence models can effectively simulate the complex turbulence problems in the volumetric detonation process of condensed phase explosive fuels.

[0055] Fifth, complex chemical reactions occur between the fuel components of condensed phase explosives. The technical difficulty of the volume detonation process of condensed phase explosive fuels involves the accurate description of component transport and chemical reactions. In this invention, the Species Transport model is used to describe the component chemical reaction process.

[0056] Specifically, this invention employs a volumetric model-based approach to describe the chemical reactions occurring between multiple components. A volumetric model refers to the fact that the chemical reactions occur throughout the entire volume occupied by the condensed-phase explosive fuel, rather than being limited to the surface or interface. This invention uses a finite-rate model-based approach to describe the variation of the reaction rate constant during the component chemical reactions. Furthermore, this invention forcibly excites the volumetric detonation reaction process between the condensed-phase explosive fuel components by specifying a high-temperature, high-pressure excitation point, and sets up multiple monitoring points to track and record the changes in flow field pressure, temperature, and velocity during the volumetric detonation reaction. By employing the above techniques, the component transport and chemical reaction processes are described and recorded from multiple levels.

[0057] Using the Fluent numerical simulation software, the convection-diffusion equation can be expressed in the following form: ; In the formula, the subscript Indicates the first Components; Indicates the local mass fraction of a component; Indicates the net reaction rate of the component; Indicates the diffusion flux of the component; This indicates an exogenous term related to a chemical reaction.

[0058] diffusion flux of components In turbulent flow, it can be represented in the following form: ; In the formula, the subscript Indicates the first Components; Indicates the mass diffusion coefficient; Indicates turbulent viscosity; This represents the turbulent Schmidt number. This represents the thermal diffusivity.

[0059] In component chemical reactions, the finite rate model is used to describe the variation of the reaction rate constant. The net reaction rate of a component can be expressed in the following form: ; In the formula, the subscript Indicates the first Components; Indicates the molar mass of the component; Indicates the first The molar rate of formation of a component in a chemical reaction; It represents the total number of all chemical reactions.

[0060] No. The general representation of a chemical reaction is shown below: ; In the formula, the subscript Indicates the first Components; Indicates the first The total number of all components involved in a chemical reaction; and These represent the stoichiometric coefficients of the reactant components and the product components, respectively. and These are the chemical formulas for the reactant components and the product components, respectively. This represents the reaction rate constant.

[0061] The reaction rate constant, using the Arrhenius reaction rate model, can be expressed in the following form: ; In the formula, the subscript Indicates the first A chemical reaction; Indicates the pre-exponential factor; Indicates temperature; Indicates the temperature index; Indicates activation energy; This represents the universal gas constant.

[0062] By using the Species Transport model, the chemical reaction process during the volumetric detonation of condensed phase explosive fuel can be effectively simulated.

[0063] Based on the above technical solutions, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made on the basis of the technical solutions of this application fall within the protection scope of the present invention.

[0064] Example 1: This embodiment provides a method for constructing a calculation model of the dispersion and diffusion process of condensed phase explosive fuel. The condensed phase explosive fuel adopts a composite liquid-solid explosive fuel as the charge structure. The method includes the following steps.

[0065] Step 101: Simplified modeling of the charge structure.

[0066] Based on the charge structure of the composite liquid-solid explosive fuel, a geometric solid model of the flow field region during the dispersion and diffusion process of the condensed phase explosive fuel was constructed using 3D modeling software. The attribute names of the boundary regions of each component in the flow field region were set, and the geometric solid model of the flow field region was divided using mesh generation software to form a mesh model file of the dispersion and diffusion process of the condensed phase explosive fuel.

[0067] In this embodiment, the 3D modeling software includes commonly used SolidWorks, Pro / Engineer, and ANSYS modeling tools. In this embodiment, the ANSYS Workbench DesignModeler modeling tool is used.

[0068] In this embodiment, the mesh generation software includes ANSYS ICEM and Altair HyperMesh mesh generation tools. In this embodiment, ANSYS ICEM mesh generation software is used.

[0069] The specific process of step 101 includes the following steps.

[0070] Step 10101: Modeling the structure of the fuel charge in the condensed phase explosive.

[0071] The charge structure of composite liquid-solid explosive fuel is summarized and analyzed. Small and fragmented minor components in the charge structure are reasonably discarded, and the charge structure is abstracted and simplified into a regular cylindrical structure. Based on the abstract and simplified regular cylindrical structure, three-dimensional modeling software is used to create point, line, surface and volume geometric solid elements layer by layer according to the modeling method from low-level primitives to high-level primitives. Based on the hollow central tube structure of the regular cylindrical structure, Boolean addition and subtraction operations are performed on the topological structure of the geometric solid elements to form a condensed phase explosive fuel charge structure model.

[0072] In step 10101, the regular cylindrical structure includes: a hollow central tube structure, a thin-shell metal support structure around the circumference, and a composite liquid-solid explosive fuel filling the space area enclosed by the central tube structure and the metal support structure.

[0073] Step 10102: Model the surrounding air environment.

[0074] Using 3D modeling software, a large-scale cylindrical spatial region was drawn. The modeling process adopted a modeling method from low-level primitives to high-level primitives, creating points, lines, surfaces, and volumetric geometric elements layer by layer to form a model of the surrounding atmospheric environment.

[0075] In step 10102, the surrounding air environment model includes the ground at the lower end, the side of the cylindrical surface, and the top surface at the upper end.

[0076] Step 10103: Model the geometric entity model of the flow field region.

[0077] The condensed phase explosive fuel charge structure model formed in step 10101 and the surrounding air environment model formed in step 10102 are uniformly assembled and merged in a 3D modeling software. Combining the spatial positional relationship of the condensed phase explosive fuel charge structure model and the vertical height of the condensed phase explosive fuel during detonation, the spatial coordinate system position occupied by the surrounding air environment model is adjusted to ensure that the condensed phase explosive fuel charge structure model is located at the center of the spatial region. From the surrounding air environment model, the thin-shell metal support structure is excluded, and the hollow central tube structure is extracted to form a complete flow space used in the simulation calculation, thus forming a geometric solid model of the flow field region.

[0078] Step 10104: Set the boundary attributes of the flow field region components.

[0079] Set component boundary attributes for the geometric entity model of the flow field region formed in step 10103; the method for setting component boundary attributes includes: setting the hollow central tube structure as the velocity inlet boundary condition and defining unique names; setting the ground surface of the lower end face as the wall boundary condition and defining unique names; defining the side surface of the cylindrical surface as the pressure outlet boundary condition and defining unique names; and defining the top surface of the upper end face as both the pressure outlet boundary condition and the escaping boundary condition and defining unique names.

[0080] Step 10105: Mesh generation of the geometric solid model of the flow field region.

[0081] For the geometric entity model of the flow field region formed in step 10103, a structured three-dimensional mesh is generated using mesh generation software. During mesh generation, a three-dimensional auxiliary block structure is first created and associated with the geometric entity model of the flow field region, including a one-to-one correspondence between point and line geometric entity elements. Next, O-Grid and Y-Grid meshing of the auxiliary block structure is performed, and the positions of the meshing auxiliary points are adjusted to ensure that the lengths of the auxiliary lines in the auxiliary block structure are evenly distributed. Finally, the number of mesh nodes on the auxiliary lines is set, and the preview function is used to view the meshing effect of the structured three-dimensional mesh, ensuring that a preset mesh model file with satisfactory mesh quality is obtained when the geometric entity model of the flow field region is meshed.

[0082] In this embodiment, O-Grid and Y-Grid subdivision of auxiliary block structures are commonly used mesh subdivision methods for cylindrical three-dimensional geometric regions, with the aim of improving mesh quality during mesh subdivision.

[0083] In step 10105, the specific conditions for the mesh quality to meet the requirements include: the mesh orthogonal quality is greater than or equal to 0.3, the mesh distortion is less than 0.5, and the mesh aspect ratio is less than or equal to 10.

[0084] Step 10106: Output the mesh model file of the condensed phase explosive fuel dispersion and diffusion process.

[0085] The preset mesh model file formed in step 10105 is converted into an unstructured three-dimensional mesh. Combined with the computational fluid dynamics numerical simulation method and simulation tools used, the mesh model file is output.

[0086] Step 102: Construction of a mathematical and physical model for the dispersion and diffusion process of condensed phase explosive fuel.

[0087] Using the mesh model file of the condensed phase explosive fuel dispersion and diffusion process formed in step 101, a mathematical and physical model of the condensed phase explosive dispersion and diffusion process is constructed using Fluent software. The flow field region is initialized to form an instance model file of the condensed phase explosive fuel dispersion and diffusion process.

[0088] The mathematical and physical model of the dispersion and diffusion process of condensed phase explosives includes a basic framework, material parameters, a multiphase flow model, a turbulence model, and a discrete phase model.

[0089] Step 102 includes the following steps.

[0090] Step 10201: Construction of the basic framework for the condensed phase explosive fuel dispersion and diffusion process.

[0091] This paper provides a detailed description of the basic phenomena and changing laws of the dispersion and diffusion process of condensed-phase explosives. Within an Eulerian framework, based on the mass, momentum, and energy conservation equations of computational fluid dynamics, it employs an inviscid compressible material model to describe the fluid characteristics of the process, a transient scheme to describe its temporal characteristics, and an absolute reference velocity to describe its kinematic characteristics. Specified density, pressure, and gravitational acceleration values ​​for the flow field region form the basic framework for the dispersion and diffusion process of condensed-phase explosives.

[0092] Step 10202: Setting material parameters for the condensed phase explosive fuel dispersion and diffusion process.

[0093] Based on the non-viscous compressible material model involved in step 10201, detailed material parameters for the dispersion and diffusion process of condensed phase explosive fuel are further set. For composite liquid-solid explosive fuel, which includes liquid phase components and solid phase components, the material parameters set according to the material properties of the liquid phase components and solid phase components include density, specific heat capacity, thermal conductivity, dynamic viscosity coefficient, relative molecular mass, standard enthalpy of formation, standard entropy of formation, and reference temperature. The set material parameters for the dispersion and diffusion process of condensed phase explosive fuel are used for subsequent simulation calculations of the dispersion and diffusion process.

[0094] Step 10203: Construction of a multiphase flow model for the condensed phase explosive fuel dispersion and diffusion process.

[0095] Based on the basic framework of the condensed-phase explosive fuel dispersion and diffusion process constructed in step 10201, a VOF (Volume of Fluid) multiphase flow model is adopted to describe the evolution of the volume fraction of each fluid phase during the condensed-phase explosive fuel dispersion and diffusion process. An explicit algorithm is used to calculate the change process of the volume fraction, and a sharp and dispersed processing method is used to track the change process of the interface, combined with the influence of implicit volume forces; thus, a multiphase flow model of the condensed-phase explosive fuel dispersion and diffusion process is constructed.

[0096] In step 10203, each fluid phase includes: using a gas phase to represent the surrounding air environment, using a liquid phase to represent the liquid phase component in the composite liquid-solid explosive fuel, and using a solid phase to represent the solid phase component in the composite liquid-solid explosive fuel.

[0097] Step 10204: Construction of a turbulent model for the dispersion and diffusion process of condensed phase explosive fuel.

[0098] Based on the basic framework of the condensed-phase explosive fuel ejection and diffusion process constructed in step 10201, the large eddy model is adopted to describe the evolution of the flow pattern in the entire flow field region during the condensed-phase explosive fuel ejection and diffusion process. The default constant Prandtl number and turbulent Schmidt number in Fluent software are used to close the large eddy model, and the mass mixing degree of the flow field region at the turbulent scale is examined to construct a turbulent model of the condensed-phase explosive fuel ejection and diffusion process.

[0099] Step 10205: Construction of discrete phase model for condensed phase explosive fuel dispersion and diffusion process.

[0100] Based on the basic framework of the condensed phase explosive fuel dispersion and diffusion process constructed in step 10201, a discrete phase model is adopted in the Lagrangian coordinate system to describe the evolution of the covered area during the condensed phase explosive fuel dispersion and diffusion process. The interaction mode between discrete phase particles and continuous phase fluid is activated to track the unsteady diffusion process of discrete phase particles. The properties of discrete phase particles are set to construct a discrete phase model of the condensed phase explosive fuel dispersion and diffusion process.

[0101] In step 10205, the properties of the discrete phase particles include specifying that the discrete phase particles are inert particles, specifying the injection method of the discrete phase particles, and specifying the particle diameter distribution of the discrete phase particles.

[0102] In step 10205, the specific method for specifying the particle diameter distribution of discrete phase particles is as follows: using a uniform distribution form and specifying the characteristic diameter of the particles; or using a Rosing-Lammler distribution form and specifying the minimum diameter, maximum diameter, and average diameter of the particles.

[0103] Step 10206: Initialization settings of the flow field region for the condensed phase explosive fuel dispersion and diffusion process.

[0104] Based on the basic framework of the condensed phase explosive fuel ejection and diffusion process constructed in step 10201, and on the basis of completing the operations in steps 10202 to 10205, a standardized method is used to initialize the flow field region. The flow field region initialization includes overall flow field region initialization and local region initialization, thus completing the flow field region initialization settings for the condensed phase explosive fuel ejection and diffusion process.

[0105] In step 10206, the overall initialization of the flow field region includes specifying the initial velocity, initial temperature, and initial gas phase composition of the flow field region.

[0106] In step 10206, local region initialization includes specifying the local temperature, local pressure, and initial volume fraction of the liquid phase component in the composite liquid-solid explosive fuel in the condensed phase explosive fuel charge structure model in step 10201.

[0107] In step 10206, the initial volume fraction of the liquid phase component in the composite liquid-solid explosive fuel is specified to be in the range of 0.001 to 0.20.

[0108] Step 103: Setting up the control method for solving the diffusion process of condensed phase explosive fuel.

[0109] Based on the example model file of the condensed phase explosive fuel dispersion and diffusion process formed in step 102, and using the computational fluid dynamics numerical simulation method, a solution control method for the condensed phase explosive fuel dispersion and diffusion process is set up. This includes algorithm discretization and relaxation stability factor, display visualization and saving of calculation results, total calculation time and single-step time step. The solution control method is set up to form a data model file of the condensed phase explosive fuel dispersion and diffusion process. The simulation calculation of the condensed phase explosive fuel dispersion and diffusion process is then performed to obtain the calculation results.

[0110] Step 103 includes the following steps.

[0111] Step 10301: Discretize the algorithm and set the relaxation stability factor.

[0112] A numerical solution method based on the coupling of pressure and velocity is employed, using a numerical calculation process that first makes a preliminary estimate, then iteratively calibrates, and finally continuously updates. The flow field region is discretized using a second-order precision spatial calculation scheme, and the default relaxation stability factor in Fluent software is used to ensure the reliable execution of the numerical iterative algorithm.

[0113] Step 10302: Display visualization and save calculation results settings.

[0114] The visualization display settings for the fuel dispersion and diffusion process of condensed phase explosives are configured, and the display results include the pressure distribution, velocity distribution and temperature distribution in the flow field region. The output frequency and display style of the display results are specified. The calculation results are saved, and the output interval and saving format of the calculation results are specified.

[0115] Step 10303: Calculate the total duration and set the single-step time step.

[0116] Based on the actual time history of the simulation calculation of the fuel dispersion and diffusion process of condensed phase explosives, the total calculation time, the single-step time step, and the maximum number of iterations in the single-step calculation are set; the calculation is executed to obtain the simulation calculation results of the fuel dispersion and diffusion process of condensed phase explosives.

[0117] In step 10303, the specified range for the single-step time step is 1.0 × 10⁻⁶. -5 s to 1.0×10 -4 s.

[0118] The model construction method in this embodiment can comprehensively consider various fluid dynamic phenomena and changes in the diffusion process of condensed phase explosive fuel. It has a clear approach and distinct levels, and can obtain accurate calculation results, meeting the needs of practical engineering applications.

[0119] This embodiment also provides a calculation model for the dispersion and diffusion process of condensed-phase explosive fuel, which is obtained using the same construction method as the calculation model for the dispersion and diffusion process of condensed-phase explosive fuel described above. This model employs a numerical method based on the finite volume method to simulate and calculate the dispersion and diffusion process of composite liquid-solid explosive fuel in the surrounding air environment under the action of explosive driving force, thereby obtaining the dispersion and distribution morphology of the condensed-phase explosive fuel.

[0120] The computational model in this embodiment is based on computational fluid dynamics numerical simulation, which can simulate the motion process and flow characteristics of condensed phase explosive fuel dispersion and diffusion. It provides a feasible technical solution for simulating the dispersion and diffusion of composite liquid-solid explosive fuels in the air, and deepens the understanding of the changing laws of explosive fuel dispersion and diffusion.

[0121] The innovations of the calculation model and construction method for the condensed phase explosive fuel dispersion and diffusion process in this embodiment are mainly reflected in the following aspects.

[0122] First, the computational model involved in this embodiment fully covers the entire computational process.

[0123] Specifically, the process includes three steps: simplified modeling of the charge structure, construction of a mathematical and physical model, and setting of the solution control method. These correspond to the preprocessing stage, model setup stage, and solution output stage in numerical simulation calculations, respectively. The technical solution involved in this embodiment provides a template framework and exemplary model for the analysis and processing of similar problems.

[0124] Second, the computational model involved in this embodiment takes into account the entire physical process.

[0125] Specifically, this study focuses on the construction of a mathematical and physical model for the dispersion process of condensed-phase explosive fuel. It primarily utilizes an Eulerian framework, integrating multiple physical models such as multiphase flow, turbulence, and discrete phase models to describe the flow changes of the liquid phase components in composite liquid-solid explosive fuels. Simultaneously, it incorporates Lagrangian methods to characterize the diffusion characteristics of the solid phase components within the composite liquid-solid explosive fuel. Through the construction of this complex mathematical and physical model, it can accurately simulate the dynamic evolution of the flow morphology in the three-dimensional flow field region during the dispersion and diffusion of condensed-phase explosive fuels in the surrounding air environment, considering the interactions between various gas-liquid-solid phases. This provides valuable numerical simulation methods and referable calculation results for deepening the understanding of the dispersion and diffusion laws of condensed-phase explosive fuels and for designing their external capabilities.

[0126] Third, the computational model involved in this embodiment focuses on the entire computation process.

[0127] Specifically, the condensed-phase explosive fuel ejection process is essentially a complex flow problem involving multiple physical processes. Constructing a computational model and accurately simulating this process requires a robust preprocessing procedure and a robust numerical calculation method. Therefore, steps 101 and 103 of this embodiment focus on defining the preprocessing and solution control processes, respectively.

[0128] Example 2: This embodiment provides a method for constructing a calculation model of the fuel dispersion and diffusion process of condensed phase explosives based on the above embodiment 1. The method includes the following steps.

[0129] Step 101: Simplified modeling of the charge structure.

[0130] Step 10101: Modeling the structure of the fuel charge in the condensed phase explosive.

[0131] The explosive charge structure is abstracted and simplified into a regular cylindrical structure, including: a hollow central tube structure, a thin-shell metal support structure around the circumference, and a composite liquid-solid explosive fuel filling the space enclosed by the central tube structure and the metal support structure. The hollow central tube structure has an outer diameter of 30 mm and a length of 260 mm. The thin-shell metal support structure has an outer diameter of 220 mm and a length of 300 mm.

[0132] Step 10102: Model the surrounding air environment.

[0133] Using 3D modeling software, a large-scale cylindrical spatial region was drawn to represent the surrounding air environment model. The diameter of the surrounding air environment model is 20m, and the height is 7m.

[0134] Step 10103: Model the geometric entity model of the flow field region.

[0135] The vertical height of the condensed phase explosive fuel during detonation is 2m, located at the center of the space region.

[0136] Step 10104: Set the boundary attributes of the flow field region components.

[0137] Step 10105: Mesh generation of the geometric solid model of the flow field region.

[0138] The obtained structured 3D mesh has an orthogonality quality of 0.7, a mesh twist of 0.2, and a mesh aspect ratio of 5.

[0139] Step 10106: Output the mesh model file of the condensed phase explosive fuel dispersion and diffusion process.

[0140] Step 102: Construction of a mathematical and physical model for the dispersion and diffusion process of condensed phase explosive fuel.

[0141] Step 10201: Construction of the basic framework for the condensed phase explosive fuel dispersion and diffusion process.

[0142] The density reference value for the specified flow field region is 0.0 kg / m³. 3 The pressure reference value is 101325 Pa, and the gravitational acceleration is 9.8 m / s². 2 The direction points in the negative Z-axis direction.

[0143] Step 10202: Setting material parameters for the condensed phase explosive fuel dispersion and diffusion process.

[0144] Composite liquid-solid explosive fuel consists of a liquid phase component and a solid phase component. The liquid phase component is a polyolefin fuel with a density of 935 kg. m -3 Specific heat capacity is 1200J kg -1 K -1 The thermal conductivity is 0.2 W. m -1 K -1 The dynamic viscosity coefficient is 7.0e-6kg. m -1 s -1 The relative molecular mass is 136 kg. mol -1 The standard enthalpy of formation is -3.3e8J. mol -1 The standard generation entropy is 5.4e3J. mol -1 K -1 The reference temperature is 298K. The solid component is aluminum powder with a density of 2700 kg / m³. m -3 Specific heat capacity is 850J kg -1 K -1 The thermal conductivity is 200W. m -1 K -1 The dynamic viscosity coefficient is 1.7e-5kg. m -1 s -1 The relative molecular mass is 27 kg. mol -1 The standard enthalpy of formation is 1.3e7J. mol -1 The standard generation entropy is 1.64e3J. mol -1 K -1 The reference temperature is 298K.

[0145] Step 10203: Construction of a multiphase flow model for the condensed phase explosive fuel dispersion and diffusion process, using the VOF multiphase flow model.

[0146] Step 10204: Constructing a turbulent model for the dispersion and diffusion process of condensed phase explosive fuel, using the large eddy model.

[0147] Step 10205: Construction of discrete phase model for condensed phase explosive fuel dispersion and diffusion process.

[0148] Specify the discrete phase particles as inert particles, specify the injection method of the discrete phase particles as volumetric injection, specify the particle diameter distribution of the discrete phase particles as uniform distribution, and specify the characteristic particle diameter as 10e-6m.

[0149] Step 10206: Initialization settings of the flow field region for the condensed phase explosive fuel dispersion and diffusion process.

[0150] The overall flow field region is initialized, with the initial velocity specified as 0 m / s, the initial temperature as 300 K, and the initial O2 fraction in the gas phase as 0.23. Local regions are initialized, with the local temperature of the composite liquid-solid explosive fuel specified as 300 K, the local pressure as 101325 Pa, and the initial volume fraction of the liquid phase component in the composite liquid-solid explosive fuel as 0.1.

[0151] Step 103: Setting up the control method for solving the diffusion process of condensed phase explosive fuel.

[0152] Step 10301: Discretize the algorithm and set the relaxation stability factor.

[0153] Step 10302: Display visualization and save calculation results settings.

[0154] The output frequency of the display results is specified to be updated every 5 time steps, and the display style is the top view display mode; the output interval of the calculation results is specified to be saved every 25 time steps, and the calculation results are saved in both instance model file and data model file.

[0155] Step 10303: Calculate the total duration and set the single-step time step.

[0156] The total calculation time was set to 0.2 s, the single-step time step to 5e-5 s, and the maximum number of iterations per step to 20. The calculation was executed, yielding simulation results of the condensed-phase explosive fuel ejection and diffusion process. The simulation results include the calculated pressure, velocity, and temperature distributions in the flow field region at different times.

[0157] This embodiment conducts simulation calculations based on the calculation model involved in this invention. The approach is clear and well-structured, and it can obtain accurate calculation results that meet the needs of practical engineering applications.

[0158] Example 3: This embodiment provides a method for constructing a calculation model of the fuel dispersion and diffusion process of condensed phase explosives based on the above embodiment 1. The method includes the following steps.

[0159] Step 101: Simplified modeling of the charge structure.

[0160] Step 10101: Modeling the structure of the fuel charge in the condensed phase explosive.

[0161] The explosive charge structure is abstracted and simplified into a regular cylindrical structure, including: a hollow central tube structure, a thin-shell metal support structure around the circumference, and a composite liquid-solid explosive fuel filling the space enclosed by the central tube structure and the metal support structure. The hollow central tube structure has an outer diameter of 50 mm and a length of 600 mm. The thin-shell metal support structure has an outer diameter of 500 mm and a length of 700 mm.

[0162] Step 10102: Model the surrounding air environment.

[0163] Using 3D modeling software, a large-scale cylindrical spatial region was drawn to represent the surrounding air environment model. The diameter of the surrounding air environment model is 50m, and the height is 12m.

[0164] Step 10103: Model the geometric entity model of the flow field region.

[0165] The vertical height at which the condensed phase explosive fuel detonates is 3m, located at the center of the space region.

[0166] Step 10104: Set the boundary attributes of the flow field region components.

[0167] Step 10105: Mesh generation of the geometric solid model of the flow field region.

[0168] The obtained structured 3D mesh has an orthogonality quality of 0.5, a mesh twist of 0.4, and a mesh aspect ratio of 8.

[0169] Step 10106: Output the mesh model file of the condensed phase explosive fuel dispersion and diffusion process.

[0170] Step 102: Construction of a mathematical and physical model for the dispersion and diffusion process of condensed phase explosive fuel.

[0171] Step 10201: Construction of the basic framework for the condensed phase explosive fuel dispersion and diffusion process.

[0172] The density reference value for the specified flow field region is 0.0 kg / m³. 3 The pressure reference value is 101325 Pa, and the gravitational acceleration is 9.8 m / s². 2 The direction points in the negative Z-axis direction.

[0173] Step 10202: Setting material parameters for the condensed phase explosive fuel dispersion and diffusion process.

[0174] Composite liquid-solid explosive fuel consists of a liquid phase component and a solid phase component. The liquid phase component is a mixture of epoxides and aromatics, with a density of 1055 kg. m -3 Specific heat capacity is 1050 J kg -1 K -1 The thermal conductivity is 2.3 W. m -1 K -1 The dynamic viscosity coefficient is 12.0e-5kg. m -1 s -1 Its relative molecular mass is approximately 122 kg. mol -1 The standard enthalpy of formation is -8.3e7J. mol -1 The standard generation entropy is 2.2e3J. mol -1 K -1 The reference temperature is 298K. The solid component is aluminum powder with a density of 2700 kg / m³. m -3 Specific heat capacity is 850J kg -1 K -1 The thermal conductivity is 200W. m -1 K -1 The dynamic viscosity coefficient is 1.7e-5kg. m -1 s -1 The relative molecular mass is 27 kg. mol -1 The standard enthalpy of formation is 1.3e7J. mol -1 The standard generation entropy is 1.64e3J. mol -1 K -1 The reference temperature is 298K.

[0175] Step 10203: Construction of a multiphase flow model for the condensed phase explosive fuel dispersion and diffusion process, using the VOF multiphase flow model.

[0176] Step 10204: Constructing a turbulent model for the dispersion and diffusion process of condensed phase explosive fuel, using the large eddy model.

[0177] Step 10205: Construction of discrete phase model for condensed phase explosive fuel dispersion and diffusion process.

[0178] The discrete phase particles are specified as inert particles. The injection method of the discrete phase particles is specified as volumetric injection. The particle diameter distribution of the discrete phase particles is specified as Rosing-Lammle distribution, with a minimum particle diameter of 1.0e-6m, a maximum particle diameter of 13.0e-6m, and an average particle diameter of 5.0e-6m.

[0179] Step 10206: Initialization settings of the flow field region for the condensed phase explosive fuel dispersion and diffusion process.

[0180] The overall flow field region is initialized, with the initial velocity specified as 0 m / s, the initial temperature as 273 K, and the initial O2 fraction in the gas phase as 0.23. Local regions are initialized, with the local temperature of the composite liquid-solid explosive fuel specified as 273 K, the local pressure as 101325 Pa, and the initial volume fraction of the liquid phase component in the composite liquid-solid explosive fuel as 0.15.

[0181] Step 103: Setting up the control method for solving the diffusion process of condensed phase explosive fuel.

[0182] Step 10301: Discretize the algorithm and set the relaxation stability factor.

[0183] Step 10302: Display visualization and save calculation results settings.

[0184] The output frequency of the display results is specified to be updated every 10 time steps, and the display style is top view display mode; the output interval of the calculation results is specified to be saved every 50 time steps, and the calculation results are saved in both instance model file and data model file.

[0185] Step 10303: Calculate the total duration and set the single-step time step.

[0186] The total calculation time was set to 0.5 s, the single-step time step to 1e-4 s, and the maximum number of iterations per step to 20. The calculation was executed, yielding simulation results of the condensed-phase explosive fuel ejection and diffusion process. The simulation results include the calculated pressure, velocity, and temperature distributions in the flow field region at different times.

[0187] This embodiment conducts simulation calculations based on the calculation model involved in this invention. The approach is clear and well-structured, and it can obtain accurate calculation results that meet the needs of practical engineering applications.

[0188] Example 4: This embodiment provides a method for constructing a calculation model of the volumetric detonation process of condensed phase explosive fuel. The method uses Fluent numerical simulation software and adopts a composite liquid-solid explosive fuel as the charge structure. The method includes the following steps.

[0189] Step 201, Overall Settings.

[0190] The specific process of step 201 is as follows: use Fluent numerical simulation software to set up the overall configuration of the condensed phase explosive fuel volume detonation process of the calculation model; the spatial dimension of the calculation model is three-dimensional simulation, a double-precision numerical calculation method based on pressure-based solver is adopted, a velocity description method based on absolute velocity is adopted, a transient time format is adopted to describe the change history of the condensed phase explosive fuel volume detonation process, and a general form of gravity acceleration additional term is set.

[0191] Step 202, VOF multiphase flow model setup.

[0192] The specific process of step 202 is as follows: Use Fluent numerical simulation software to set up the VOF multiphase flow model for the volumetric detonation process of condensed explosive fuel; the fluid phase includes two phases: the main phase is gas and the secondary phase is liquid. Use an explicit format to describe the change process of the volume fraction of each phase, and use the Sharp / Dispersed method to track the evolution process of the interaction interface of each phase.

[0193] Step 203, Turbulence model settings.

[0194] The specific process of step 203 is as follows: Use Fluent numerical simulation software to set up the turbulence model for the volumetric detonation process of condensed phase explosive fuel; set the master model of the turbulence model to the Large Eddy Simulation model, set the subgrid scale model to the WMLES model, and use the default parameter values ​​of Fluent numerical simulation software for the turbulence model constants.

[0195] Step 204, Setting up the discrete particle combustion model.

[0196] The specific process of step 204 is as follows: Use Fluent numerical simulation software to set up the discrete particle combustion model for the volumetric detonation process of condensed phase explosive fuel; activate the Discrete Phase model, set the discrete particles as the combustion type, and set the oxidizer component as oxygen.

[0197] Step 205, setting up the component chemical reaction model.

[0198] The specific process of step 205 is as follows: Use Fluent numerical simulation software to set up the component chemical reaction model for the volumetric detonation process of condensed phase explosive fuel; activate the Species Transport model, set up the component chemical reaction model based on volumetric mode and finite rate mode, and set the detailed mechanism and reaction parameters of the component chemical reaction model.

[0199] In step 205, the detailed mechanism includes the molecular formulas, stoichiometric coefficients, and rate exponents of the reactants and products.

[0200] In step 205, the reaction parameters include the pre-exponential factor, activation energy, and temperature exponent in the Arrhenius reaction rate model.

[0201] Step 206, Local initialization settings.

[0202] The local initialization settings for the volumetric detonation process of condensed phase explosive fuel include the settings for the distribution morphology of condensed phase explosive fuel dispersion and the settings for the activation of condensed phase explosive fuel detonation reaction.

[0203] Step 206 is as follows: When setting the condensed-phase explosive fuel dispersion distribution pattern, Fluent numerical simulation software is used to extract a cylindrical spatial region from the entire computational flow field region through the Automatic Mesh Adaption operation. This represents the spatial region where the condensed-phase explosive fuel dispersion distribution pattern is located, and the molar concentration distribution of various components in the composite liquid-solid explosive fuel is specified within this spatial region. When setting the condensed-phase explosive fuel detonation reaction initiation pattern, Fluent numerical simulation software is used to set spatial coordinate points through the Automatic Mesh Adaption operation. These points represent the condensed-phase explosive fuel detonation reaction initiation points, and the temperature and pressure conditions at these initiation points are specified to trigger the volumetric detonation reaction process.

[0204] As a preferred embodiment, the distribution pattern of condensed phase explosive fuel is obtained by a calculation model of the condensed phase explosive fuel dispersion and diffusion process. The model uses a numerical method based on the finite volume method to simulate and calculate the dispersion and diffusion process of composite liquid-solid explosive fuel in the surrounding air environment under the action of explosion driving force, and obtains the distribution pattern of condensed phase explosive fuel dispersion.

[0205] As a preferred embodiment, the method for constructing the calculation model of the condensed phase explosive fuel dispersion and diffusion process adopts the method given in Example 1.

[0206] This embodiment also provides a calculation model for the volumetric detonation process of condensed-phase explosive fuel. This model is obtained by constructing the calculation model for the volumetric detonation process of upper condensed-phase explosive fuel. Under the premise of obtaining the dispersion distribution pattern of condensed-phase explosive fuel, this model induces a chemical reaction in composite liquid-solid explosive fuel and describes the volumetric detonation process of condensed-phase explosive fuel.

[0207] Example 5: This embodiment provides a calculation model and construction method for the volumetric detonation process of condensed phase explosive fuel based on the above embodiment 4. The construction method includes the following steps.

[0208] Step 201, Overall Settings.

[0209] Use Fluent numerical simulation software to configure the overall computational model. In the Fluent Launcher, under the Dimension option, select 3D to perform a three-dimensional simulation, and also select the Double Precision option. In the Fluent numerical simulation software interface, under the General tab, select Pressure-Based for the solver type, Absolute for the velocity description method, Transient for the time format, and Gravity to consider gravitational acceleration.

[0210] Step 202, VOF multiphase flow model setup.

[0211] In the Fluent numerical simulation software interface, under the Models tab, select the Volume Of Fluid (VOF) multiphase flow model in the Multiphase section. Choose Explicit for the volume fraction description, and select the Sharp / Dispersed method for the interface tracking simulation. Also, check Implicit Body Force to consider implicit body forces. In the Phases tab, define the Primary Phase as the gas phase and the Secondary Phase as the liquid phase.

[0212] Step 203, Turbulence model settings.

[0213] In the Fluent numerical simulation software interface, under the Models tab, select Large Eddy Simulation (LES) in Viscous viscous flow to indicate that the large eddy model is the master turbulence model. Select the WMLES model in Subgrid Scale. Use the software's default parameter values ​​for Model Constants, namely Energy Prandtl Number of 0.85, Wall Prandtl Number of 0.85, and Turbulent Schmidt Number of 0.7.

[0214] Step 204, Setting up the discrete particle combustion model.

[0215] In the Fluent numerical simulation software interface, under the Models tab, select the "Interaction with Continuous Phase" option in the Discrete Phase section to activate the discrete particle model and consider the interaction between discrete particles and the continuous fluid phase. Add an Injection to set the discrete particle properties, setting the discrete particle type to Combusting, the discrete particle diameter distribution to rosin-rammler, the oxidant component to O2 (oxygen), and the reaction product component to CO2 (carbon dioxide). Further set the discrete particle diameter distribution parameters, including: minimum diameter 1.0e-7 m, maximum diameter 6.0e-6 m, and average diameter 1.5e-6 m; discrete particle duration 10 ms; and discrete particle temperature 350 K.

[0216] Step 205, setting up the component chemical reaction model.

[0217] In the Fluent numerical simulation software interface, under the Models tab, activate the SpeciesTransport model. In the reaction type, select Volumetric to indicate a volumetric model. Further select the Finite Rate / No TCI option to indicate a component chemical reaction model based on a finite rate model. Set the detailed mechanism and reaction parameters of the component chemical reaction model, as shown in Table 1 below.

[0218] Table 1. Component chemical reaction model parameters in Example 1

[0219] Step 206, Local initialization settings.

[0220] When setting the condensed-phase explosive fuel dispersion distribution pattern, in the Fluent numerical simulation software interface, under the Adapt tab in the Domain menu, use the Automatic Mesh Adaptation operation to extract a cylindrical spatial region from the entire computational flow field region. The radius of this cylindrical spatial region is specified as 3.0m, representing the spatial region where the condensed-phase explosive fuel dispersion distribution pattern is located. Specify the molar concentration distribution of various components in the composite liquid-solid explosive fuel within this spatial region, where the liquid-phase explosive fuel C... 10 H 16The molar concentration of the solid explosive fuel Al is 0.02, the molar concentration of the solid explosive fuel Al is 0.1, and the molar concentration of the oxidizer component O2 is 0.2. Furthermore, when setting up the detonation reaction initiation of the condensed-phase explosive fuel, the Automatic Mesh Adaption operation is used to set spatial coordinate points representing the detonation reaction initiation point of the condensed-phase explosive fuel. The temperature at the initiation point is 1500K, and the pressure is 10MPa, initiating the volumetric detonation reaction process.

[0221] This embodiment conducts simulation calculations based on the calculation model involved in this invention. The approach is clear and well-structured, and it can obtain accurate calculation results that meet the needs of practical engineering applications.

Claims

1. A method for constructing a computational model of the volumetric detonation process of condensed-phase explosive fuel, wherein the method uses Fluent numerical simulation software, and the condensed-phase explosive fuel adopts a composite liquid-solid explosive fuel as the charge structure, characterized in that... The construction method includes the following steps: Step 201, Overall Settings; Step 202, VOF multiphase flow model setup; Step 203, Turbulence model settings; Step 204, Setting up the discrete particle combustion model; Step 205, setting up the component chemical reaction model; Step 206, Local initialization settings; The local initialization settings for the volumetric detonation process of condensed phase explosive fuel include the settings for the distribution morphology of condensed phase explosive fuel dispersion and the settings for the activation of the detonation reaction of condensed phase explosive fuel.

2. The method for constructing a calculation model for the volumetric detonation process of condensed-phase explosive fuel as described in claim 1, characterized in that, The specific process of step 201 is as follows: use Fluent numerical simulation software to set up the overall configuration of the condensed phase explosive fuel volume detonation process of the calculation model; the spatial dimension of the calculation model is three-dimensional simulation, a double-precision numerical calculation method based on pressure-based solver is adopted, a velocity description method based on absolute velocity is adopted, a transient time format is adopted to describe the change history of the condensed phase explosive fuel volume detonation process, and a general form of gravity acceleration additional term is set.

3. The method for constructing a calculation model for the volumetric detonation process of condensed-phase explosive fuel as described in claim 1, characterized in that, The specific process of step 202 is as follows: Use Fluent numerical simulation software to set up the VOF multiphase flow model for the volumetric detonation process of condensed explosive fuel; the fluid phase includes two phases: the main phase is gas and the secondary phase is liquid. Use an explicit format to describe the change process of the volume fraction of each phase, and use the Sharp / Dispersed method to track the evolution process of the interaction interface of each phase.

4. The method for constructing a calculation model for the volumetric detonation process of condensed-phase explosive fuel as described in claim 1, characterized in that, The specific process of step 203 is as follows: Use Fluent numerical simulation software to set the turbulence model for the volumetric detonation process of condensed phase explosive fuel; set the master model of the turbulence model to the Large Eddy Simulation model, set the subgrid scale model to the wall-modulated large eddy simulation model, and use the default parameter values ​​of Fluent numerical simulation software for the turbulence model constants.

5. The method for constructing a calculation model for the volumetric detonation process of condensed-phase explosive fuel as described in claim 1, characterized in that, The specific process of step 204 is as follows: Use Fluent numerical simulation software to set up the discrete particle combustion model for the volumetric detonation process of condensed phase explosive fuel; activate the Discrete Phase model, set the discrete particles as the combustion type, and set the oxidizer component as oxygen.

6. The method for constructing a calculation model for the volumetric detonation process of condensed-phase explosive fuel as described in claim 1, characterized in that, The specific process of step 205 is as follows: Use Fluent numerical simulation software to set up the component chemical reaction model for the volumetric detonation process of condensed phase explosive fuel; activate the Species Transport model, set up the component chemical reaction model based on volumetric mode and finite rate mode, and set the detailed mechanism and reaction parameters of the component chemical reaction model. In step 205, the detailed mechanism includes the molecular formulas, stoichiometric coefficients, and rate exponents of the reactants and reaction products; In step 205, the reaction parameters include the pre-exponential factor, activation energy, and temperature exponent in the Arrhenius reaction rate model.

7. The method for constructing a calculation model for the volumetric detonation process of condensed-phase explosive fuel as described in claim 1, characterized in that, The specific process of step 206 is as follows: When setting the distribution pattern of condensed phase explosive fuel, Fluent numerical simulation software is used. A cylindrical spatial region is extracted from the entire computational flow field region through the AutomaticMesh Adaption operation to represent the spatial region where the condensed phase explosive fuel distribution pattern is located. The molar concentration distribution of various components in the composite liquid-solid explosive fuel in the spatial region is specified. When setting up the detonation reaction initiation of condensed phase explosive fuel, Fluent numerical simulation software is used to set spatial coordinate points through the AutomaticMesh Adaption operation to represent the detonation reaction initiation point of condensed phase explosive fuel, and the temperature and pressure conditions at the initiation point are specified to initiate the volumetric detonation reaction process.

8. The method for constructing a calculation model for the volumetric detonation process of condensed-phase explosive fuel as described in claim 1, characterized in that, The condensed phase explosive fuel dispersion distribution pattern is obtained by using a calculation model of the condensed phase explosive fuel dispersion diffusion process. This model uses a numerical method based on the finite volume method to simulate and calculate the dispersion diffusion process of composite liquid-solid explosive fuel in the surrounding air environment under the action of explosion driving force, and obtains the condensed phase explosive fuel dispersion distribution pattern.

9. The method for constructing a calculation model for the volumetric detonation process of condensed-phase explosive fuel as described in claim 8, characterized in that, The method for constructing the computational model of the fuel dispersion and diffusion process of condensed phase explosives includes the following steps: Step 101, Simplified modeling of the charge structure: Based on the charge structure of the composite liquid-solid explosive fuel, a geometric solid model of the flow field region during the dispersion and diffusion process of the condensed phase explosive fuel was constructed using 3D modeling software. The attribute names of the boundary regions of each component in the flow field region were set, and the geometric solid model of the flow field region was divided using mesh generation software to form a mesh model file of the dispersion and diffusion process of the condensed phase explosive fuel. Step 102, Construction of a mathematical and physical model for the dispersion and diffusion process of condensed phase explosive fuel: Using the mesh model file of the condensed phase explosive fuel ejection and diffusion process formed in step 101, a mathematical and physical model of the condensed phase explosive ejection and diffusion process is constructed using Fluent software. The flow field region is initialized to form an instance model file of the condensed phase explosive fuel ejection and diffusion process. The mathematical and physical model of the condensed phase explosive dispersion and diffusion process includes a basic framework, material parameters, a multiphase flow model, a turbulence model, and a discrete phase model; Step 103, Setting up the control method for solving the condensed phase explosive fuel dispersion and diffusion process: Based on the example model file of the condensed phase explosive fuel dispersion and diffusion process formed in step 102, and using the computational fluid dynamics numerical simulation method, a solution control method for the condensed phase explosive fuel dispersion and diffusion process is set up. This includes algorithm discretization and relaxation stability factor, display visualization and saving of calculation results, total calculation time and single-step time step. The solution control method is set up to form a data model file of the condensed phase explosive fuel dispersion and diffusion process. The simulation calculation of the condensed phase explosive fuel dispersion and diffusion process is then performed to obtain the calculation results.

10. A calculation model for the volumetric detonation process of condensed phase explosive fuel, characterized in that, The model is obtained by constructing the calculation model of the volume detonation process of condensed phase explosive fuel as described in any one of claims 1 to 9. Under the premise of obtaining the dispersion distribution pattern of condensed phase explosive fuel, the model induces a chemical reaction in the composite liquid-solid explosive fuel to describe the volume detonation process of condensed phase explosive fuel.

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