Year: 2024
Type: article
Abstract: We have revisited the complex surface burning of metalized energetic substances where the micro and nano metal particles and oxidizers chemically interact in the inert binder confinement.Both thermal and interfacial behaviors of the particles on the burning front during convective and diffusive thermal transport were investigated.Highly complex processes take place in three specific regions: the outflow region exposed to the ambient air consists of hot product gases with gasified metal oxides, the in-between melt layer comprised of reacting particles in condensed phase, and the inner region unreacted while kept at temperature below the melting point.We focus on the melt layer undergoing chemical reactions of a mixture of zirconium and potassium perchlorate, also known as the NASA Standard Initiator (NSI).The complex interface evolution is tracked via the level sets, and the finite chemical reaction rate law is constructed based on the calorimetry data for determining the activation energy and heat of reaction.Both slow and fast reactions are investigated to address the mesoscale effects of thermochemical and thermomechanical behaviors of metalized energetic substances that involve multi-physical interactions amongst metals, oxides, binder, and ambient air.The findings elucidate that there exists a strong competition between the hydrodynamic pressure induced from hot product gas generation and the interfacial interactions associated with deforming particles inside the melt layer during combustion.
Source: Journal of Propulsion and Energy
Authors: Hong-Suk Choi, SangYeop Han, Jai-ick Yoh
Institution: Seoul National University
Language: English
Subfield: Mechanics of Materials
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W4408107411