Ignition and Growth Reactive Flow Model for Aluminized Emulsion Explosive

Document identifier: oai:DiVA.org:ltu-77624
Keyword: Engineering and Technology, Civil Engineering, Geotechnical Engineering, Teknik och teknologier, Samhällsbyggnadsteknik, Geoteknik
Publication year: 2020
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Abstract:

To investigate the non-ideal detonation properties of aluminized emulsion explosive, a series of tests for an emulsion explosive with 5% aluminum powder additive were carried out with mortar confinement. The velocity of detonation (VoD) and the curvature of the detonation front for different charge diameters were obtained from the tests with a high-speed camera. The burning process of the aluminized emulsion explosive has been modelled with the ignition and growth (I&G) flow model in the LS-DYNA code. A routine based on the optimization program LS-OPT code was developed to identify the parameters in the burning rate function with the detonation velocities and the front curvature radii from two tests. A Perl code was implemented in the routine and was used to calculate the VoD, fit the detonation front and obtain the detonation front curvature radii.  The calibrated parameters were used to predict the VoDs and the detonation front curvature radii for the rest cases. The results indicate that both the VoDs and the detonation front curvature radii from the numerical modelling are in good agreement with the experimental results. The numerical results also indicate that the variety of the burn fraction and the peak pressure with the change of charge diameters is reasonable with the calibrated parameters.

Authors

Changping Yi

Luleå tekniska universitet; Geoteknologi
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Ulf Nyberg

Luleå tekniska universitet; Mining and Geotechnical Engineering - Swedish Blasting Research Centre; Luleå tekniska universitet; Geoteknologi
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Daniel Johansson

Luleå tekniska universitet; Geoteknologi
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Håkan Schunnesson

Luleå tekniska universitet; Geoteknologi
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