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Science and Technology of Energetic Materials

Vol.71, No.2 (2010)

Research paper

An approximate theory of laser-induced ignition of boron / potassium nitrate pyrotechnic(*in Japanese)
Hisahiro Nakayama, Tomonori Miyashita, Seiki Hashino, Naohiko Yoshitake, and Ritsuo Orita
p.31-38

Abstract

An approximate theory of the laser-induced ignition of boron / potassium nitrate pyrotechnic under the condition of one-dimensional heat input was discussed. The surface temperature, at which the exothermic chemical reaction could be sustained without the heat input by laser irradiation, was theoretically derived. In the process of the derivation, the exothermic chemical reaction of boron and potassium nitrate was assumed to occur in the immediate vicinity of the surface heated up by laser irradiation. The surface temperature profile was obtained by solving the heat conduction equation in which an Arrhenius type chemical reaction source was incorporated. The equation was approximately solved by adopting the solution method proposed by Friedman. Since the derived surface temperature well agreed with the surface temperature measured at the onset of ignition in the laser ignition test, it was found that the derived surface temperature could be used as the laser ignition criterion. The ignition delay derived from this technique was in good agreement with the test result in the range of the laser power density utilized in the test.

Keywords

Boron, potassium nitrate, laser-induced ignition, ignition temperature, one-dimensional ignition model.

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