Enhancing Composite Solid Propellant Burning Rates with Potassium Doped Ammonium Perchlorate-Part I

• Published in: Journal of propulsion and power 2014-03, Vol.30 (2), p.277-284
• Main Authors: Ishitha, Kumar, Ramakrishna, P. A
• Format: Article
• Language: English
• Subjects: Ammonium perchlorates; Burning rate; Composite propellants; Computation; Conferences; Deflagration; Lobbying; Low pressure; Potassium; Propulsion; Recrystallization; Solid propellants; Thermal conductivity
• ISSN: 0748-4658; 1533-3876
• DOI: 10.2514/1.B34767

The objective of this paper is to understand the observed changes in behavior of ammonium perchlorate deflagration characteristics reported in literature, when it is doped with potassium. Successive recrystallization is employed to dope potassium into ammonium perchlorate. This paper, through various recrystallization techniques, conclusively puts an end to doubts regarding the actual process of acquisition of potassium by ammonium perchlorate. It is concluded that the increase in the potassium content in ammonium perchlorate is due to the filter used during recrystallization process. From the experiments conducted to obtain the deflagration rates of ammonium perchlorate, it is observed that potassium doped ammonium perchlorate has higher burning rates and also a higher low-pressure deflagration limit. As potassium doped is within the ammonium perchlorate crystal, thermal conductivity and specific heat values for ammonium perchlorate with various percentages of potassium are obtained. These values are incorporated into the computational studies on ammonium perchlorate. The computational studies performed in this paper are not intended to reproduce the experimental results but to illustrate the various features of the potassium doped ammonium perchlorate deflagration. With these computational studies, the observed burning rate increase and low-pressure deflagration limit increase of ammonium perchlorate with doped potassium are explained.