Study On Energy Release Mechanism And Thermal Effect Of Solid Slow-release Energetic Materials

The solid slow-release energetic material refers to a type of solid energetic material that can stably burn to generate energy after being ignited,and the combustion and release process is controllable.Solid slow-release energetic materials are widely used in the fields of ammunition destruction,metal cutting,and simulation of laser thermal effects due to their excellent combustion and energy release characteristics.This paper conducts theoretical analysis,numerical simulation and experimental research on the combustion and energy release mechanism of solid slow-release energetic materials and the coupling effect of the high-temperature heat flow generated by the combustion and metal materials.The main research results are as follows:(1)In order to make the solid slow-release energetic material burn to produce a molten metal fluid with high energy density and improve its thermal effect on the steel target,the formulation of the solid slow-release energetic material is first designed.The energy release characteristics,stability and economy of the commonly used components of solid slow-release energetic materials were analyzed and compared,and the main reactants of the solid sustained-release energetic materials were determined to be ferroferric oxide and aluminum powder.For the first time,barium nitrate was added as an oxidizing agent and a gas generating agent to the main reaction agent,and then phenolic resin was added as a binder to form a solid slow-release energetic material.After completing the formulation design,in order to ensure its good mechanical properties and combustion energy release characteristics,the structure of the solid slow-release energetic material eruption device was designed and calculated,and two different structures of the through-hole type and the Laval nozzle type were obtained.Eruption device,and gives the production process and filling process of the solid slow-release energetic material.The design scheme and theoretical calculation method proposed in this paper can provide reference basis for the application of solid slow-release energetic materials in different fields.(2)A complete solid slow-release energetic material combustion energy release test test system was designed,and test parameters such as combustion time,combustion chamber pressure,high-temperature heat flow rate,temperature,and temperature rise curve on the back of the target plate were tested and analyzed.For the first time,the energy density of high-temperature heat flow is used to comprehensively characterize its speed and temperature,and its energy density calculation formula is given.The test results show that the use of the Laval nozzle type eruption device can effectively increase the energy density of the high-temperature heat flow;according to the first test results,the Laval nozzle profile parameters,solid slow-release energetic material production process and filling process have been optimized Designed and carried out the second test.The test results show that the optimized Laval nozzle type ejection device can effectively reduce the heat loss of the high-temperature heat flow;compared with the equal surface combustion,the increased surface combustion can increase the combustion chamber Pressure,and significantly increase the energy density of high-temperature heat flow.(3)In order to provide comprehensive and effective data for theoretical modeling,Fluent simulation software was used to numerically simulate the coupling effect of high-temperature heat flow and target plate,and the simulation results are in good agreement with the experimental results,which proves the simulation model and simulation used in this paper.The algorithm has high reliability.Through the layered processing of the target plate and combined with the VOF model,the numerical simulation of the heating and deformation process of the solid target plate in the Fluent fluid simulation software is realized.This simulation scheme can realize the solid material in the fluid in the Fluent fluid simulation.The heating and deformation under the action of materials provide new simulation ideas.(4)Based on the gas-phase steady-state combustion model,the combustion characteristics of the solid slow-release energetic material are studied by combining the results of experiments and simulations,and the structure of the combustion wave and flame jet is obtained.The combustion wave is divided into three areas: solid-phase heating zone,oxidant flame zone and diffusion flame zone,and the formation mechanism of the three zones are respectively given;the analysis results of the flame jet structure produced by different structure eruption devices show that The high-temperature heat flow generated by the Vaal nozzle structure eruption device has better stability and strong resistance to external interference.Combining energy conservation equations,one-dimensional flow control equations and two-level chemical reaction equations,the mass burning rate of solid slow-release energetic materials is deduced The formula,combined with the test results,verifies the accuracy of the formula.The burning rate formula shows that the mass burning rate of the solid slow-release energetic material is directly proportional to the pressure of the combustion chamber,and the proportional coefficient is mainly affected by the formulation of the solid slow-release energetic material and the combustion method.(5)On the basis of the heat conduction equation,the high-temperature heat flow is regarded as a continuous step energy wave,and the axial temperature field of the target plate under the action of the high-temperature heat flow is derived;a one-dimensional fluid dynamics model and a steady-state melting model are used The process of high temperature heat flow erosion of the target plate was studied.The energy density distribution function of the high temperature heat flow on the surface of the target plate was obtained by matlab data fitting,and the penetration depth of the target plate and the change of the molten hole shape with time under the action of high temperature heat flow were derived.relationship.The theoretical model was verified with test and simulation results,which proved that the theoretical model has good reliability.The verification results also show that the high-temperature heat flow to the target plate is mainly determined by the phase change time of the target plate under the action of the high-temperature heat flow.Compared with the one-dimensional hydrodynamic penetration model,the steady-state melting model is more suitable for describing the erosion and damage process of the target plate caused by the high-temperature heat flow.