Kazuomi Itoh, Hideo Watanabe, Dayu Ding and Tadao Yoshida Abstract: The spectra of the colored flames of firework compositions were measured with a spectrometer and processed into chromaticity coordinates. The change in color purity as a function of composition is shown using chromaticity diagrams. Firework star compositions of red, yellow, green and blue were tested. …
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Category:JPyro – Articles
The main category – things that are published in the Journal
Metal–Fluorocarbon Pyrolants: IX. Burn rate and Radiometric Performance of Magnesium/Teflon/Viton (MTV) Modified with Zirconium
Ernst-Christian Koch Abstract: The burn rate, u (mm s−1) of fuel rich magnesium/Teflon/Viton (MTV) is increased by 65% upon addition of zirconium whereas the spectral efficiency Eβ (J g−1 sr−1) is reduced by 15%. Keywords: Burn rate, zirconium, magnesium, MTV, polytetrafluoroethylene, radiometry, TeflonTM, VitonTM Ref: JPyro, Issue 28, 2009, pp16-18 (J28_16)
Fireworks on the Sumida River
Damien Liu-Brennan and Tadao Yoshida Abstract: Fireworks (hanabi) were originally displayed on the Sumida River in 1733 as a memorial service for the victims of starvation due to crop failures and plague, and an epidemic of cholera. The fireworks display originated as the “Ryōgoku Kawabiraki Hanabi” (Ryōgoku River-Opening Fireworks) with only 20 fireworks displayed. Although …
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Sound Level Analysis of Firecrackers
Jeya Rajendran and T. L.Thanulingam Abstract: The noise levels from sound-producing firecrackers, both commercial and newly formulated, were measured. Commercial sound-producing firecrackers produce noise in the range of 130.7 dB(AI)/150.4 dB(C) peak to 142.8 dB(AI)/162.6 dB(C) peak at a distance of 4 m. A set of pyrotechnic compositions of potassium nitrate (KNO3), sulphur (S), aluminium (Al) and boric acid (H3BO3) …
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Fireplay
David Howard Abstract: ‘‘Fireplay’’ is a generalist overview of pyrotechnics. It is indebted (and acknowledges its debt) to seminal works such as Brock’s ‘‘History of Pyrotechnics’’ (1949), yet develops an aesthetic – even metaphysical – discussion of the key question for our profession: ‘Why do fireworks move people?’ Keywords: History, aesthetics, gunpowder Ref: JPyro, Issue …
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A Thermokinetic Model for the Combustion of Strobe Composition
Matthew L. Davies Abstract: A model chemical reaction scheme, in which a substance undergoes a two-stage decay process, is developed. It is shown that this reaction scheme follows the Shimizu hypothesis for pyrotechnic strobe combustion; both decay stages are temperature dependent with only the second generating a significant quantity of heat. The model is derived …
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Metal–Fluorocarbon Pyrolants: VIII.1‡ Behavior of Burn Rate and Radiometric Performance of two Magnesium/Teflon/Viton (MTV) Formulations upon Addition of Graphite§
Ernst-Christian Koch Abstract: The burn rate, u (mm s−1) of fuel rich magnesium/Teflon/Viton (MTV) is increased by 23-36 % upon addition of 5 wt% graphite whereas the spectral efficiency Eβ (J g−1 sr−1) remains largely unaffected. Keywords: Burn rate, graphite, magnesium, MTV, polytetrafluoroethylene, radiometry, TeflonTM, VitonTM Ref: JPyro, Issue 27, 2008, pp38-41 (J27_38)
Movement Dynamics Of Firework Shells Fired From Mortars
V. Ya. Yakovlev and S. K. Chankaev Abstract: Experimental investigations were carried out using 125 and 310 mm firework shells. The pressures in a mortar during firing were measured. A mathematical model of the firing action concerning low pressure in the space behind the shell was developed. Here it is supposed that non-simultaneous processes of ignition …
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Comparison of 6-DOF Trajectory Model with Modified Linear Theory for Bullets
Dimitrios N. Gkritzapis, Elias E. Panagiotopoulos, Dionissios P. Margaris and Dimitrios Papanikas Abstract: A modified linear model is proposed for fast and accurate prediction of short and long-range trajectories of spin-stabilized bullets via atmospheric flight to a final impact point. This model is compared with a full 6-DOF trajectory model. The computational flight analysis takes …
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The Debris Hazard from Fireworks Held in Steel ISO Containers
Roy Merrifield and Peter Allan Moreton Abstract: A number of serious accidents in European Union countries involving explosions of fireworks stored in steel ISO freight containers has shown that the hazards associated with bulk-stored fireworks might be greater than previously thought. To address this problem an EU research programme was initiated, part of which involved …
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