Numerical modelling of detonation reaction zone of nitromethane by EXPLO5 code and Wood and Kirkwood theory

Scientific paper - Original scientific paper

• Author: Barbara Štimac
• Author: Hay Yee Serene Chan
• Author: Martin Kunzel
• 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; Mining
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract (english)

The detonation reaction zone of nitromethane (NM) has been extensively
studied both experimentally and theoretically. The measured particle velocity
profile of NM shows the existence of a sharp spike followed by a rapid drop
over the first 5-10 ns (fast reaction). The sharp spike is followed by a gradual
decrease (slow reactions) which terminate after approximately 50-60 ns when
the CJ condition is attained. Based on experimental data, the total reaction zone
length is estimated to be around 300 μm. Some experimental observations,
such as the reaction zone width and the diameter effect, can be satisfactorily
reproduced by numerical modelling, provided an appropriate reaction rate model
is known.
Here we describe the model for numerical modelling of the steady state detonation
of NM. The model is based on the coupling thermochemical code EXPLO5
with the Wood-Kirkwood detonation theory, supplemented with different
reaction rate models. The constants in the rate models are calibrated based
on experimentally measured particle velocity profiles and the detonation
reaction zone width. It was found that the model can describe the experimentally measured total reaction time (width of reaction zone) and the particle velocitytime
profile of NM. It was found also that the reaction rate model plays a key
role on the shape of the shock wave front. In addition, the model can predict
the detonation parameters (D, pCJ, TCJ, VCJ, etc.) and the effect of charge diameter
on the detonation parameters.

• Keywords (english): nitromethane; reaction zone; particle velocity; EXPLO5; Wood and Kirkwood theory
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Central European Journal of Energetic Materials
• Numbering: vol. 17, no. 2, pp. 239-261
• p-ISSN: 1733-7178
• e-ISSN: 2353-1843
• DOI: https://doi.org/10.22211/cejem/124193
• URN:NBN: urn:nbn:hr:169:922530
• Online first: 2020-06-25
• 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: http://www.wydawnictwa.ipo.waw.pl/cejem/Vol-17-Number2-2020/CEJEM_01112.pdf
• Type of resource: Text
• Access conditions: Open access
• Created on: 2020-08-31 10:08:13