Numerical Modelling of Detonation Reaction Zone of Nitromethane by EXPLO5 Code and Wood and Kirkwood Theory

Štimac, Barbara; Chan, Hay Yee Serene; Künzel, Martin; Sućeska, Muhamed

doi:10.22211/cejem/124193

Cited by 7 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We arbitrarily selected the last 500 ns of the record in the PMMA window, when the signal seemed to stabilise after initial velocity scatter, and determined an average 877 m/s (� 18 m/s for 95 % confidence interval) particle velocity at the explosive/inert interface, a value consistent with ASV results, i. e. particle velocities calculated from shock velocities measured in PMMA (Table 1 in Section 3.1). The limited number of records of the interface motion highlights the relative difficulty to carry out IW experiments on coarse granular explosives, when compared to pressed, melt-cast, cast-cured [15] and of course homogeneous liquid explosives [27].…”

Section: Shot Acceptor ρ 0 (G/cmmentioning

confidence: 99%

Urea‐Hydrogen Peroxide (UHP): Comparative study on the experimental detonation pressure of a non‐ideal explosive

Halleux,

Pons,

Wilson

et al. 2023

Propellants Explo Pyrotec

View full text Add to dashboard Cite

Carbamide Peroxide, an adduct of Urea and Hydrogen Peroxide (UHP) industrially used as a solid source of hydrogen peroxide, exhibits the behaviour of a tertiary explosive but a detailed performance characterisation is still lacking in the literature. In this work, we calculated a 20 % experimental TNT equivalence for brisance, i. e. the shattering effect from the shock wave transmitted from the detonating high explosive into adjacent materials, by experimental indirect measurement of UHP detonation pressure. We determined a 3.5 GPa detonation pressure for 5 kg unconfined UHP charges (0.87 g/cm3, 120 mm charge diameter) by measuring the attenuated shock wave velocity (ASV) in adjacent inert materials using passive optical probes. Particle velocity measurements at the interface of a PMMA impedance window carried out with Photonic Doppler Velocimetry on scaled‐down charges of 90 g UHP under heavy confinement (0.85 g/cm3, 30 mm charge diameter, 4 mm thick steel) are consistent with ASV results in the PMMA acceptors but further investigations are required to determine the detonation pressure, using a small‐scale experimental setup. The ASV method has proven reliable to assess the brisance of a non‐ideal explosive for risk assessment purposes.

show abstract

Section: Shot Acceptor ρ 0 (G/cmmentioning

confidence: 99%

Urea‐Hydrogen Peroxide (UHP): Comparative study on the experimental detonation pressure of a non‐ideal explosive

Halleux,

Pons,

Wilson

et al. 2023

Propellants Explo Pyrotec

View full text Add to dashboard Cite

show abstract

“…The Wood and Kirkwood (WK) slightly divergent detonation theory [18, 19], incorporated in EXPLO5 thermochemical code, enables calculation of detonation properties of non‐ideal explosives. The coupling of the WK theory and EXPLO5 code is described in [20, 21].…”

Section: Description Of Modelmentioning

confidence: 99%

Prediction of Cylinder Wall Velocity Profiles for ANFO Explosives Combining Thermochemical Calculation, Gurney Model, and Hydro‐Code

Sućeska

Serene

Zhang

et al. 2021

Propellants Explo Pyrotec

Self Cite

View full text Add to dashboard Cite

Theoretical prediction of performance indicators of explosives plays an important role in the development of new explosives and explosive formulations. Of particular interest is the possibility to estimate the velocity of metal liner driven by an explosive charge. We present a theoretical model for estimation of metal cylinder wall velocity profiles of non‐ideal ANFO explosives. The model is based on thermochemical calculations using EXPLO5 code, expressing the Gurney energy in terms of JWL equation of state, and using hydro‐code simulation. The Wood‐Kirkwood detonation theory, incorporated in EXPLO5, is applied for calculation of detonation parameters of non‐ideal ANFO explosives. It was found that this approach enables prediction of cylinder wall velocity for ANFO explosives, with the error at V/V0=7 expansion ratio not exceeding 100 m/s.

show abstract

Reaction zone structure and detonation parameters of nitromethane/polymethylmethacrylate and its mixture with microballoons

et al. 2021

View full text Add to dashboard Cite

In the present work, the detonation wave structure and detonation parameters for nitromethane (NM) and its mixtures with polymethylmethacrylate (PMMA) and glass microballoons (GMB) were studied by a velocity interferometer system for any reflector laser interferometer. The PMMA concentration varied from 2% to 4%. It is shown that PMMA additives lead to a change in the reaction zone structure, which can be observed as an appearance of a cellular instability of the detonation front. The detonation parameters of the mixture up to 3% PMMA are close to those of pure nitromethane and reduced when 4% PMMA is added. The addition of 2% GMB to the NM/PMMA mixture leads to the formation of a detonation front with a characteristic size of heterogeneities on the order of GMB diameter. In this case, the detonation parameters are reduced, and the values of the detonation velocity decrease by about 10% compared to NM/PMMA mixtures.

show abstract

Numerical Modelling of Detonation Reaction Zone of Nitromethane by EXPLO5 Code and Wood and Kirkwood Theory

Cited by 7 publications

References 0 publications

Urea‐Hydrogen Peroxide (UHP): Comparative study on the experimental detonation pressure of a non‐ideal explosive

Urea‐Hydrogen Peroxide (UHP): Comparative study on the experimental detonation pressure of a non‐ideal explosive

Prediction of Cylinder Wall Velocity Profiles for ANFO Explosives Combining Thermochemical Calculation, Gurney Model, and Hydro‐Code

Reaction zone structure and detonation parameters of nitromethane/polymethylmethacrylate and its mixture with microballoons

Contact Info

Product

Resources

About