Jet flow simulation of nano CL-20 explosive ink

摘要

Nano CL-20 explosive ink base on direct writing technology was applied for micro-charge of the micro-detonation sequence of MEMS micro-initiators. Direct writing of CL-20 explosive ink is the ink flow driven by nozzle pressure and rapid solidification, which was influenced by direct writing pressure, needle diameter and ink viscosity. In order to study the effect of these influence factors, a simulation model of direct writing jet of CL-20 explosive ink was set up. FLUENT, numerical simulation software was applied to simulate the change of ink jet velocity under the different pressure, needle diameter and ink viscosity. The simulation results showed that the fluid velocity in nozzle increased proportionally when the pressure rose. Moreover, the ink viscosity increased while the velocity fell and its range decreased. With the increase of nozzle diameter, the ink velocity rose and its range augmented.