A Unified Model for the Acceleration-Produced Burning Rate Augmentation of Metalized Solid Propellants
作者:
C. T. CROWE,
期刊:
Combustion Science and Technology
(Taylor Available online 1972)
卷期:
Volume 5,
issue 1
页码: 55-60
ISSN:0010-2202
年代: 1972
DOI:10.1080/00102207208952503
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Experiments have shown that acceleration of metalized composite propellants can affect an increased burning rate. The pressure-time trace of an accelerated propellant, which under static conditions would be neutral, exhibits a rapid increase to a maximum pressure and then decays asymptotically toward a quasi-equilibrium value. The model presented here attributes the augmented burning rate to the inertial retention of metal-metal oxide globules in pits on the propellant surface and the attendant heat transfer from the hot globules to the surface. A burning rate augmentation analysis for the initial period when the globules have near-spherical shapes predicts the burning-rate dependence on internal ballistic parameters and explains the observed transient behavior. As burning continues the globules grow and deform into irregularly shaped platelets and sheets which characterize the quasi-equilibrium period. Extending the model to include platelet shapes yields a functional relationship between burning rate, pressure level and acceleration which is validated by experiment.
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