An experimental study was undertaken with the objective of generating data that would be in a suitable form to provide a proper test of extinguishment theories. Data reported in the literature from motor firings, although often of practical value, do not seem to provide the necessary (dP/dt-P) history throughout the transient or at the moment of extinction. Additionally, in motor tests there are the superimposed effects of erosive burning, the pressure being determined by grain ablation as well as venting, and the possibility of reignition. To overcome these disadvantages, an optical strand burner was modified for use as a laboratory-scale apparatus to study extinguishment by rapid depressurization. Other advantages of this type of apparatus are that studies can be conveniently carried out on small strand-size sample of propellant, and high-speed motion pictures can be taken of the extinguishment event. Three composite propellants were selected for study. The results are compared with predictions of a simplified theory of response of combustion to pressure perturbation put forth by von Elbe in AIAA Paper 66-668, 1966. (Author)
Extinguishment of Solid Propellants by Rapid Depressurization
1968
5 pages
Report
Keine Angabe
Englisch