Study On The Mechanism Of A Structure Reaction Armor Disturbance To Jet

This paper regarding a certain structure’s explosive reactive armor(ERA) which has additional cover plate and partition as the research goal, the interferences of the ERA to jets are studied combining the methods of theoretical analysis, numerical simulations and experiments,and the plates’movement after the ERA is detonated are analyzed combing with the research goal, and the effect ranges of applied field for the reactive armor were modified.This paper uses two steps to do the simulation and the certain structure is detonated by different kinds of jets formed by different liners under different angles of entry, and the inferences of ERA to jets and movement rules of the plates are researched through the method of distributed numerical simulation. The results show that:with the liners diameter incress,the curves’change of 3/4/5 plate slow;the angle changes has little influence to the first and the second plate,while the third,forth and fifth plate’s velocity and the location to the main armor increase and the larger the angle, the more obvious changes. This paper also studies the applied fields while the ERA is detonated which the jet angle is 45°,the results show that:the range of the applied fields does not exceed 176mm;while the jet angle exceeds 60°,the time is about 1130μs,otherwise the time is about 960μs.while the jet location change from left to right,the speed and location of each metal plate increase,and the same to the applied fields range and time.Finally, the influence of additional cover plate or partition to movement rules of plates for the double parallel ERA is studied,and the applied fields of structure in extreme case is also studied. The results show that:while the additional cover plate exists,all plates have the curve that rose after the first drop,the minimum velocity and location exist when the distance between the cover plate and upper reactive armor is 6mm; while the additional partition exists, the minimum velocity and location exist when the distance between the partition and ERA is zero,in other cases,the results has little change.