Numerical Analysis of Propulsion Mechanism ofBoiling Liquid Expanding Vapor Explosion

As a sharp phase transition phenomenon, the boiling liquid expanding vapor explosion (BLEVE) is widely applicable to facilities related with launching and propulsion.In this work, the VOF (Volume of Fraction) model was employed in the simulation of the two-phase flow field, and the source item in the Navier-Stokes equation was optimized based on the fluid conditions.Moreover, the motion of the bullet was traced using an unstructured dynamic mesh method.Three kinds of superheated vapor with different filling ratios were chosen to simulate the BLEVE process and analyze the field pressure, the expanding rate, the phase transition and the bullet's acceleration.The results indicate that BLEVE is a simple and quick way of energy conversion, and the expanded two-phase flow propels the bullet out of the barrel within tens of milliseconds.