Mesoscale simulation study on formation of reactive double-layered liner

A mesoscale numerical simulation model of double-layered liner with reactive material and copper is established by means of mesoscale numerical simulation method. The mesoscale morphology, velocity characteristics and the force-thermal coupling characteristics of reactive material during the formation process are studied by simulating the double-layered liner with typical structure. Six kinds of double-layered liner with different liner thickness ratios are simulated to study the influence of liner thickness relationship on formation. The main results are as follows: The slug is almost completely formed by the reactive outer layer liner, and the jet head is completely formed by the inner liner. The slug speed is about 450m/s, the jet head speed is about 5000m/s, PTFE and Al material speed is basically the same, there is no velocity gradient; The pressure and temperature of reactive outer layer liner are positively correlated. The impact temperature rise of reactive material is low due to the wave impedance characteristics of double-layered liner, which may lead to a low degree of activation. In addition, the jet length and head velocity decrease with the increase of total liner thickness. The liner thickness is increased from 1mm/3mm to 2mm/5mm, the jet length is shortened by 20%, and the head speed is reduced by 15%; At the same time, the thickness of copper inner layer liner has a greater influence on the jet length, and too thick liner will have a negative effect on the pressure and temperature of the jet.