Numerical models for afterburning of TNT detonation products in air

Donahue, L.; Zhang, F.; Ripley, Robert C.

doi:10.1007/s00193-013-0467-2

Cited by 17 publications

(19 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…kJ / kg. Figure 13 shows the comparison of the modeled and experimental pressure time-history (at point P3; Donahue et al, 2013). From the results, it is evident that simulations with the proposed additional energy value better match the experimental results.…”

Section: Resultsmentioning

confidence: 96%

“…The first case (Kuhl et al, 1998) refers to Lawrence Livermore National Laboratory (LLNL) test of a fully confined explosion of 875 g of TNT inside a 16.6-m 3 cylindrical tank (radius 1.17 m, height: 3.87 m) that was previously studied by Edri et al (2013). The second case (Donahue et al, 2013) conducted at Defense R&D Canada Suffield refers to a fully confined explosion of 4 kg of TNT inside a 26-m 3 chamber of 3 m interior diameter and 4.2 m long. These examples are used to validate the procedure and show advantages of the procedure in comparison to the Chemical approach.…”

Section: Simplified Ab Energy Approachmentioning

confidence: 99%

See 1 more Smart Citation

Additional afterburning energy value to simulate fully confined trinitrotoluene explosions

Hernández

Hao

Abdel–jawad

2016

International Journal of Protective Structures

View full text Add to dashboard Cite

Euler-Lagrange software packages are commonly employed in the analysis and design of chambers subjected to internal detonations of high explosives because they allow modeling the interaction between high-explosive gas products, air, liquid, and structures. In general, the expansion of high-explosive products is modeled by the Jones-Wilkinson and Lee equation of state, and additional extension methods such as the Miller or the additional energy release extensions are used to model the afterburning energy which is released after the detonation. These extension methods require that the additional energy by unit mass is predefined. Although the difference between the heat of combustion and the heat of detonation provides a specific value for the additional energy, for example, 10.01 MJ/kg TNT for trinitrotoluene charges detonated inside of chambers with rich oxygen, this value is generally inappropriate if high-explosive gas products and air are modeled separately, that is, by the Jones-Wilkinson and Lee equation of state and the ideal gas equation of state, respectively. This article explains how to determine an appropriate value for the specific additional energy value for use in the commercial software package AUTODYN for more reliable predictions of the quasi-static gas pressure in fully confined chambers subjected to trinitrotoluene explosion. The procedure detailed in this article can be applied to any kind of chamber geometries and chamber materials. A simplified chart for the afterburning energy as a function of the charge mass density is derived. The proposed approach in predicting the quasi-static gas pressure is validated with the quasi-static gas pressure described by the Unified Facilities Criteria's guideline and some experimental tests. A procedure to determine the additional afterburning energy that should be employed for highly deformable chambers is also explained.

show abstract

Section: Resultsmentioning

confidence: 96%

Section: Simplified Ab Energy Approachmentioning

confidence: 99%

Additional afterburning energy value to simulate fully confined trinitrotoluene explosions

Hernández

Hao

Abdel–jawad

2016

International Journal of Protective Structures

View full text Add to dashboard Cite

show abstract

“…The amount of oxygen required to enable a full combustion process by reacting with the detonation products is 5.234 moles per 1.0 mole of TNT (Donahue, 2008). Table 3 presents the calculation of the total number of moles necessary to fully react with fuels (C, CO, H 2 , and CH 4 ) of the TNT detonation products.…”

Section: Afterburning Energy Releasementioning

confidence: 99%

“…Under temperatures lower than the ignition temperature, the chemical reaction cannot occur. Table 5 (Donahue, 2008) shows the ignition temperature for each of the potential reacting fuels. To summarize, the required conditions for afterburning to occur are the presence of available oxygen, mixing of the detonation products with the oxygen and temperatures levels above the ignition temperatures of the reacted fuels.…”

Section: Afterburning Energy Releasementioning

confidence: 99%

See 1 more Smart Citation

On Blast Pressure Analysis Due to a Partially Confined Explosion: III. Afterburning Effect

Edri

Feldgun

Karinski

et al. 2012

International Journal of Protective Structures

View full text Add to dashboard Cite

This paper aims at extending our understanding with regard to some characteristics of an interior explosion within a room with limited venting. An interior explosion may be the result of an ammunition storage explosion, or an explosive charge as part of a terrorist action or a warhead explosion that follows its penetration into a closed space in a military action. Full scale experiments have been performed with a TNT charge detonated at the center of a single room sized space with rigid boundaries. The room has a limited size opening for venting at the ceiling. Numerical simulations of the problem have been performed using AUTODYN Ver. 12.1 and compared with the experimental measurements. Some deviations between the measured pressure and the predicted pressure motivated the present study in an attempt to study the effect of the additional energy released due to the burning of the detonation products reacting with the surrounding oxygen. The study that is described in this paper enhanced our understanding. Incorporation of this effect considerably improved the predictions. The present study clarified when, how and to what extent the afterburning should be introduced in the analysis.

show abstract

Experimental study and numerical simulation of the afterburning of TNT by underwater explosion method

Cao

Chen

2014

Shock Waves

View full text Add to dashboard Cite

Numerical models for afterburning of TNT detonation products in air

Cited by 17 publications

References 6 publications

Additional afterburning energy value to simulate fully confined trinitrotoluene explosions

Additional afterburning energy value to simulate fully confined trinitrotoluene explosions

On Blast Pressure Analysis Due to a Partially Confined Explosion: III. Afterburning Effect

Experimental study and numerical simulation of the afterburning of TNT by underwater explosion method

Contact Info

Product

Resources

About