Modeling and Simulation of Back Blast Flow Field of a Recoilless Gun Launching in Finite Space

Abstract

A recoilless gun is a kind of weapon equipment for individual soldier and its back blast flow has certain influence on the shooter during the launch process. In order to study the launch safety of a recoilless gun firing in a finite space of 2.5×2.5×2m, numerical simulation of the back blast flow field was carried out based on the three-dimensional unsteady viscous compressible N-S equations. The result shows that a complex reflected shock wave is formed due to the reflection of the wall behind the nozzle. The reflected shock wave represents reciprocating motion in the finite space and its intensity is much higher than that of the initial shock wave. Critical damage will be imposed on the shooter if no safeguard procedure is adopted. The high temperature gas flow may ignite the inflammable gases in the finite space and cause secondary damage. The research results are significant for understanding the characteristics of the back blast flow of the recoilless gun launching in the finite space, predicting and taking effective action to reduce the damage on the shooter.