Research On Explosion-electricity Coupling Mechanism

Explosive is a substance that can quickly undergo a chemical reaction under the action of a certain external energy,release a large amount of heat and generate gaseous products,form a high-pressure substance in the surrounding medium.Explosives have controllable reaction process and speed,small mass and volume,and simple production process,so they are widely used in military,industrial,and civilian fields.In recent years,the military and civilian fields have put forward higher requirements on the performance of explosives,and many scholars have explored to increase the energy density of explosives.One is to study the properties of explosives,including the micro-nanoization of explosives,the research of composite explosives,the preparation of total nitrogen compounds and metal hydrogen.The second is to couple external energy with explosives to improve the output performance of explosives,and explosion-electricity coupling belongs to this approach.The essence of explosion-electricity coupling is to place energized electrodes at both ends of the explosive,and use the plasma generated by the explosive as a conductive medium.By coupling the electric energy with the energy of the explosive explosion,the purpose of increasing the explosive velocity,explosion pressure and other important parameters can be achieved.Foreign research on explosion-electricity coupling starts early,and preliminary results have been obtained.However,most of the studies have failed to achieve good gains,some key issues have not been resolved,and the test methods and characterization methods need to be improved.Domestically,there has not been a direct study on the effect of explosiveelectric coupling on the detonation velocity and detonation pressure of explosives.This thesis designed and built a set of high-energy pulse power supply system,which can provide up to 90 k J of energy.When the charging voltage is 3000 V,the peak current reaches29.01 k A.Typical TNT explosives,8701 explosives,Al-containing explosives and plastic explosives were selected as the research objects.Designed two different types of charges: flat charge and cylindrical charge.Used the detonation velocity measured by the detonation velocimeter and the detonation pressure measured by the Photonic Doppler Velocimetry technique as the main characteristic parameter,to explore the effect of the explosion-electricity coupling on different explosives and different forms of charge.A large number of experiments had been carried out on the ignition time of the detonator,the discharge time of the pulse power supply,and the acquisition time of the test system.Match the time of the three through the delay trigger.The theoretical calculation model of explosive coupling was established,and the calculated detonation velocity gain error of explosive coupling was less than 6%.The results of the study show that the explosion-electricity coupling increases the detonation velocity and detonation pressure of the four selected explosives.Compared with the other three kinds of explosives,the explosive-electricity coupling has the largest gain on the explosive velocity of TNT explosives,reaching 13.33%.The detonation speed gain of the same type of explosive flat charge is better than that of the cylindrical charge.In terms of detonation pressure,the C-J pressure of the TNT flat charge increased by 13.12%,and the Von Neumann pressure of the Al-containing explosives cylindrical charge increased by 10.24%.Similarly,the detonation pressure gain of a flat charge is better than that of a cylindrical charge.Based on the theoretical and experimental research of explosion-electricity coupling,this thesis proposes an explosive enhancement output method,which has certain theoretical value and guiding significance for the exploration of future explosive performance enhancement.