One-Dimensional Model and Numerical Simulation of Propagation Process of Two-Phase Primer Jet-Flow in Ignition Tube

Abstract

The propagation of primer jets in the ignition tube is the main basis for the design of center-core ignition tube and ignition charge. The combustion model of primer and one-dimensional two-phase jet flow model of primer were established. The fourth-order Runge-Kutta method was applied to solve the ignition and combustion process of primer,and the two-step CTVD format was adopted to solve the propagation process of primer two-phase jet flow in the ignition tube. The variation rules of parameters such as pressure,two-phase velocity and void fraction at different positions of the jet in the fire tube were obtained. The results show that when the primer jet flow is propagating in the ignition tube,there is strong pressure wave at the head,and the gas velocity is higher than the solid velocity. When the pressure wave is reflected on the end surface and acts on the subsequent solid particles,the accelerated combustion of particles is caused.When the particles in the jet flow move to the right boundary,the accumulation and combustion of particles can result in the reverse pressure gradient,and the gas phase in the ignition tube presents a large reverse motion velocity.