Abstract
The eifect of compositional changes on the stability of combustion of plastic propellent, based upon ammonium perchlorate and polyisobutene, is investigated using a 2-in.-diam T burner for the frequencies 0.7-4.0 kHz at 1000 psig. Oxidizer particle size can have a pronounced effect both on the acoustic response and on the maximum pressure amplitude which can be sustained in the T burner, whereas changes in the oxidizer-fuel ratio have little effect. Titanium dioxide, usually added to plastic propellent to stabilize combustion, is shown to have a dual effect: the acoustic response is reduced and the gas phase particle damping is promoted. Finally, the effect of lithium fluoride and copper chromate on combustion instability is examined. An inverse correlation, which is frequency dependent, is observed between propellent burning rate and both the acoustic response and the maximum pressure amplitude sustained in the T burner.
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