A reactive flow model for hot-spot ignition of shocked aluminized explosives with small size aluminum grains. (March 2017)

• Record Type: Journal Article
• Authors: Bai, Fan; Liu, Yan; Huang, Feng-Lei; Hussain, Tariq
• Is Part Of: Simulation. Volume 93:Number 3(2017)
• Page Start: 177
• Page End: 183
• Publication Date: 2017-03
• Subjects: Small size aluminum -- aluminized explosive -- hot-spot -- reaction rate model -- numerical simulation; Computer simulation -- Periodicals; 003.3
• DOI: 10.1177/0037549716680896
• Languages: English
• ISSNs: 0037-5497

Abstract

To predict the influence of aluminum contents (particle size <20 µm) on the shock initiation and growth of reaction in an aluminized explosive (CL-20/AL/Binder, 85/15/5), a new numerical model is utilized. The model is based on the elastic-visco-plastic double hollow sphere pore collapse model (DZK model). In the new model, the aluminum powder combustion is assumed to partly occur during the hot-spot formation. By combining the new term of the hot-spot ignition and the reaction growth term at low pressure and high pressure in the DZK model, a new expression of reaction rate has been implemented in a hydrodynamic code (LS-DYNA) as a user-defined equation-of-state. For verification, the new model has been used to simulate the shock initiation of the aluminized explosive. The numerical results show that 4% of aluminum in this explosive reacts at the stage of hot-spot formation. The model can describe the shock-to-detonation transition process of aluminized explosive while considering the influence of the aluminum contents.