Security Analysis on Single-Screw Extrusion Process of Solid Propellant by Numerical Simulation

Abstract:

Solid propellants are flammable, explosive, which maybe initiated unexpectedly under specific excitation conditions through high-speed screwing. Though single-screw extrusion process for solid propellant occurred a large proportion accidents, the rheological parameters of the propellant material were difficult to get yet, which affects the process safety greatly. In this paper, the CFD software, POLYFLOW, and a numerical simulation method were adopted to investigate the rheological parameters in single-screw extrusion process of solid propellant. By analyzing the rheological state of a solid propellant in the screw extrusion process, the applicable numerical model was established with a substitute material for the propellant. As a result, distributions of key parameters, such as material temperature, pressure, viscosity, were obtained. The simulation shows that the material has relatively higher pressure, temperature and smaller viscosity at the screw edge, where solid propellant components were mixing and plasticizing severely, also where needs pay much attention to for safety reasons.

• Periodical: Advanced Materials Research (Volume 997)
• Pages: 605-609
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.997.605
• Online since: August 2014
• Authors: Zhong Qi He*, Ke Zhou, Shu Pan Yin
• Keywords: CFD, Polyflow, Security Analysis, Single-Screw Extrusion Process, Solid Propellant

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