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Closed vessel equipped with capillary plasma generator as the new method of propellant’s ignition and pirostatic investigation

Michalski J., Janiszewski J., Leciejewski Z., Pichola W., Surma Z.

Materiały Wysokoenergetyczne

2012

T. 4

21--26

Contemporary development of new types of ammunition is concentrated to improve the energetic characteristics, chemical stability and operational safety of propellants. Response to this requests are low vulnerability (LOVA) propellants. Previous closed vessel investigations indicated that classical primers (electric or percussion with black powder bedding) when used with LOVA propellants causes unstable burning, defagration or even lack of ignition. Plasma generators, which create higher energy fux, temperature and make possible to control combustion process are possible solution of this problem. Assuming that in the future Poland may be a manufacturer of LOVA propellants, Military University of Technology began to develop of new closed vessel equipped with capillary plasma generator (CPG) - the new method of low vulnerability propellants ignition. In CPG systems plasma generation is obtained by discharge of high power capacitors through low diameter conductors in polyethylene coating (mainly cooper, aluminium and tungsten wires), causing them to explode (or other metallic vapour generating device). After wire explosion plasma causes burning of polyethylene, giving additional energy to plasma cloud. Plasma is vented to vessel causing high energy and heat fux through radiation and metallic vapour condensation. CPG is one of the most reliable ignition sources which make possible a reduction of temperature gradient effect and control combustion process. In this paper, different solutions of plasma ignition devices are briefy described. Furthermore, in the paper are presented: idea of our capillary plasma generator, preliminary experimental results (high speed camera pictures) of free air plasma jet propagation and comparison of pictures the impulse effects of plasma and black powder ignition.