Temperature Measurement And Numerical Simulation Of Explosive Field Containing Aluminum

Different from traditional elemental explosives,the post-combustion reaction of aluminum-containing explosives allows the thermal effect to accumulate gradually,which plays a role in the thermal destruction of soft targets..Therefore,this paper adopts the method of combining numerical simulation and experimental test to study the temperature characteristics of the explosion field of aluminum-containing explosives,aiming to master the temperature distribution law of the explosion field of aluminum-containing explosives and provide strong data support for thermal damage assessment.Firstly,in view of the problem of temperature testing in harsh environments,a multi-channel transient temperature acquisition recorder with small size and high linearity is developed.The recorder can be installed within a safe distance to ensure the survival of the test system to obtain effective results in the explosion field.It can measure the temperature parameters of multiple measuring points at the same time,and can also meet the needs of different test occasions,which improves the test efficiency and the practicality of the test device.Secondly,the numerical simulation model of the explosion of aluminum-containing explosives in the free field is established,the temperature time-history curve in the explosion field is obtained,and the propagation law of temperature is analyzed.Significant secondary peak temperature,and high temperature duration becomes longer.Comparing the numerical simulation results with the measured data,the results show that the absolute value of the error is within 5%.Finally,in view of the huge damage power of the shock wave near the explosion point,the temperature measurement device cannot obtain effective temperature data,and at the same time,limited by factors such as test costs,it is impossible to obtain a large amount of actual test data.The simulation model of the explosion process in the confined space is used to fit the numerical simulation data under different charges to deduce the temperature distribution model of the explosion field of the aluminum-containing explosive.It is found that the first peak temperature distribution model of the aluminum-containing explosive in different environments is the same.In order to improve the accuracy of modeling the temperature distribution law of the explosion field,the model was optimized by using environmental factors in combination with the measured data.The error between the calculated value of the optimized temperature distribution model and the experimental value was within 10%,which verifies the feasibility of the model.properties,or can be used to calculate near-field temperatures that cannot be measured experimentally.Several factors affecting the temperature characteristics of the explosion field are analyzed,and it is found that factors such as aluminum powder content and space size will have a certain influence on the temperature of the explosion field.It can provide certain reference data for subsequent experiments.