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Science and Technology of Energetic Materials

Vol.73, No.4 (2012)

Research paper

Combustion properties of grain black powder used as a lifting charge of fireworks
Dayu Ding and Tadao Yoshida
p.109-115

Abstract

The flame temperatures of burning grain black powder and meal black powder were measured with a thermocouple and the flame spread behavior was observed with a high speed camera in this work. Because black powder-grains are involved in the flame and move through a longer distance with burned products, the powder-grain burns up far behind the flame and the apparent burning reaction zone become wide. The flame spread rate of grain black powder is very fast. On the other hand, the flame of the tightly charged meal black powder retreats to the non-burning zone in parallel as the burning wave front keeps a plane and the flame spread rate is slow. Also, influences of the ambient pressure and the grain sizes of grain black powder on the mass burning rate were examined in this work.

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Keywords

black powder, lifting charge, fireworks, combustion, flame

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