Experiments to detect the sensitivity of double base rocket propellants for low frequency oscillatory combustion (so-called L-star instability) are described. Two end burning rocket motors with a variable chamber geometry and interchangeable nozzles (generally called L-star burners) were developed and constructed. The best possible means of propellant ignition in the L-star burner was established to be a pyrotechnic lacquer in conjunction with an ignition wire. For various values of the L-star, experiments with ARP and JPN propellants were carried out. In many cases chuffing occurred, and there was a tendency towards a correlation between the occurrence of chuffing and the L-star value. Typical L-star oscillations were observed only a very few times and only for the JPN propellant. It may be concluded that the JPN and ARP double base propellants, even after prolonged storage, are fairly stable as far as L-star oscillations are concerned.
Results of L-Star-Instability Experiments with Double Base Rocket Propellants
1976
93 pages
Report
No indication
English
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