Numerical modelling of non-ideal detonation in ANFO explosives applying Wood-Kirkwood theory coupled with EXPLO5 thermochemical code

Scientific paper - Original scientific paper

• Author: Barbara Štimac
• Author: Vinko Škrlec
• Author: Mario Dobrilović
• Author: Muhamed Sućeska
• Author's institution: University of Zagreb; Faculty of Mining, Geology and Petroleum Engineering; (Department of Mining and Geotechnical Engineering)
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mining, Petroleum and Geology Engineering

Abstract (english)

Ammonium nitrate and fuel oil (ANFO) based explosive is a classic example of non-ideal high explosives. Its detonation is characterized by a strong dependence of detonation parameters on explosive charge diameter, presence and characteristics of confinement, as well as incomplete consumption of explosive at the sonic point. In this work we propose a detonation model based on the Wood-Kirkwood (WK) theory coupled with the thermochemical code EXPLO5 and supplemented with reaction rate models. Our objective is to analyze the validity of the model for highly non-ideal ANFO explosives, with emphasis on effect of reaction rate models. It was found that both single-step and two-step pressure-based models can be calibrated to reproduce experimental detonation velocity-charge radius data of ANFO at radii significantly above the failure radius (i.e. for D/Did > ~0.6). Single-step pressure-based model, with the pressure exponent equal to 1.4, proved to be the most accurate, even in the vicinity of the failure radius. The impact of the rate models is most evident on temporal (and spatial) distribution of flow parameters in detonation driving zone, especially when it comes to the conversion and width of detonation driving zone.

• Keywords (english): ANFO; non-ideal detonation; reaction rate model; numerical modelling; EXPLO5
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Defence Technology
• Numbering: vol. 17, no. 5, pp. 1740-1752
• p-ISSN: 2214-9147
• DOI: https://doi.org/10.1016/j.dt.2020.09.014
• URN:NBN: urn:nbn:hr:169:877297
• Publication: 2021-10
• Project: Number: IP-2019-04-1618; Title (croatian): Poboljšani model neidealne detonacije gospodarskih eksploziva; Title (english): An improved model of non-ideal detonation of commercial explosives; Acronym: NEIDEMO; Leader: Muhamed Sućeska; Jurisdiction: Croatia; Funding stream: IP
• Document URL: https://linkinghub.elsevier.com/retrieve/pii/S2214914720304505
• Type of resource: Text
• Access conditions: Open access
• Created on: 2021-10-26 10:21:40