Jared C. Gump and Suhithi M. Peiris Abstract: Researchers are attempting to prepare smaller (nano-scale) metal particles, and nano-scale thermitic (metal–metal-oxide) composites. When added to energetic compositions, these nano-materials could burn during or close behind the shock front produced by an explosive material. Therefore, investigation of their combustion kinetics is important, especially when the investigation …
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Category:JPyro – Articles
The main category – things that are published in the Journal
New Approaches to Model Pyrotechnic Reactions
Stefan Kelzenberg, Norbert Eisenreich and Volker Weiser Abstract: In most cases pyrotechnic mixtures are constituted from granular components. A theoretical study of such a granular system describes the temperature and concentration evolution in the energetic material by using hot spots as source terms for temperature and particles. The progress of the reaction is mainly influenced …
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Thermal Characterisation and Kinetic Modelling of Pyrotechnic Flash Composition under Adiabatic Conditions
S. P. Sivapirakasam, M. Surianarayanan* and R. Vijayaraghavan Abstract: A pyrotechnic flash composition consisting of 53% KNO3, 30% Al and 17% S is subjected to Accelerating Rate Calorimetry (ARC) studies. The onset point for thermal explosion is 191 ºC resulting in the generation of a considerable quantity of gaseous products. The mixture is vulnerable to …
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Interrelation between Impact, Friction and Thermal Energy of Pyrotechnic Cracking Reaction
S. P. Sivapirakasam and M. Surianarayanan* Abstract: Firework chemical mixtures are sensitive to thermal and mechanical stimuli and lead to many explosive incidents. Experimentally determined thermal and mechanical (impact and friction) sensitivity data of a flash composition mixture are subjected to statistical and graphical analysis in order to understand the mechanism of triggering accidents. The …
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Effect of Particle Size on the Mechanical Sensitivity and Thermal Stability aspects of Pyrotechnic Flash Compositions
S. P. Sivapirakasam, M. Surianarayanan,* F. Chandrasekaran and G. Swaminathan Abstract: The mechanical and thermal sensitivity of pyrotechnic flash compositions consisting of mixtures of potassium nitrate (KNO3), sulphur (S) and aluminum (Al) with varying particle sizes of KNO3 and Al indicated that, irrespective of the composition of the cracker mixture, all the compositions were found …
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A Prediction of Aerial Shell and Comet Trajectories Using SHELLCALC©
John Harradine and Tom Smith Abstract: This paper describes a model for predicting the path of aerial shells and Roman candle comets. This model, incorporated in a Microsoft® Excel-based freeware program, SHELLCALC©, predicts the trajectoryof these fireworks using point mass equations for range and height. These equations are modifi ed to take into consideration mortar/candle …
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Ballistics of a No. 3 Spherical Shell with Illuminant
Dayu Ding, Y. Ooki, M. Higaki and T. Yoshida Abstract: Shot experiments were carried out using a No. 3 spherical shell with an illuminant. The three dimensional trajectory of the flying shell was obtained by tracing the shell with two high-speed video cameras in different orientations and by analyzing the recorded video picture. The 3DSTAR1 …
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Ballistics of an Iron Bar Shot from a Mortar
Morimasa Higaki, Dayu Ding, Yuuzo Ooki and Tadao Yoshida Abstract: An accidental explosion in 1848 in the USA became a trigger for the development of neuroscience. An accidental explosion of black powder took place in a borehole for blasting and the expelled iron bar penetrated the head of a young man. He was injured but …
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Temperature measurements within the luminous region of a burning Ba(NO3)2/Al mixture
P. J. Disimile, R. Prasad and N. Toy Abstract: Knowledge of the local temperature field associated with a pyrotechnic event has numerous implications, especially in the field of safety and survivability. These implications involve the development of sensors that are capable of detecting pyrotechnic events and that are used in part to eliminate or reduce …
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Computer Modelling of Flying Star Ballistics
Dayu Ding, Morimasa Higaki, Yozo Ooki and Tadao Yoshida* Abstract: The burning time of stationary and flying fireworks stars was measured, the trajectories of flying stars were observed and the results were analyzed in this work. It was found that the difference in burning time between the stationary and flying burning stars was dependent on …
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