✦ LIBER ✦

Ignition of composite solid propellant at subatmospheric pressures

✍ Scribed by Michiko Harayama; Takeo Saito; Akira Iwama

Publisher: Elsevier Science
Year: 1983
Tongue: English
Weight: 538 KB
Volume: 52
Category: Article
ISSN: 0010-2180
DOI: 10.1016/0010-2180(83)90122-0

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✦ Synopsis

The ignition of composite solid propellants by CO 2 laser irradiation at low pressures has been investigated experimentally. Three ignition modes are found at subalJnospheric pressures: self-sustaining ignition, non-self-sustaining ignition, and pulsating ignition. Here, the self-sustaining and the non-self-sustaining ignition modes have been studied. Samples of an ammonium perehlorate/polybutadiene propellant were ignited. The incipient flame was detected with a phototransistor, and the temperatures at the surface and in the solid phase were measured by means of Type K thermocouples. Aspects of surface regression were recorded by photography. It is found that non-self-sustaining ignition occurs in the lower pressure range and with the higher incident heat flux from the laser. At ignition, the heat loss into the solid phase in the non-self-sustaining mode is much larger than that in the self-sustaining one. It is concluded that these ignition modes are determined independently of the exposure time after the flame's appearance.

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