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International Journal of Energetic Materials and Chemical Propulsion
Prediction of Airbag Inflator Performance
J. C. Chastenet
S.N.P.E. - Defense-Espace, Centre de Recherches du Bouchet B.P. 2, Vert-Le-Petit, 91710, France
SNPE Propulsion, Centre de Recherche du Bouchet, Rue Lavoisier, 91710 Vert-le-Petit, France
Airbag operating involves a great number of highly dependent components where the pyrotechnical charge used in an inflator as a gas generator is only one of the components. Moreover, specifications of these systems are more and more drastic in terms of performance, toxicity, lifetime, etc. Research and development of new gas generator compositions need to take into account all these aspects very early in the studies.
Thermodynamic prediction is a classical technical area. This point is only illustrated and identified limitations are given.
The lumped parameter model is described in regard to all of its possibilities: combustion of propellent grain or in bulk, multi-species with chemical interactions (overall reactions, chemical equilibrium or full chemical kinetics), real gas effects, thermal losses, hole erosion, and so on. This model is used for different purposes: prediction by direct simulation, experimental interpretation, determination of parameters impossible to measure, sensibility studies.
The experimental devices used to validate new composition performances are illustrated. Typical demonstrator tests in a constant volume tank allow specific phenomena identification and their introduction in the lumped parameter model.
Special analyses are done on possible interactions between pyrotechnical composition combustion and other components of the system: igniter composition, filter in combustion chamber, expansion of high-pressurized gas in hybrid generator, etc.
For a better understanding of the system operations, full CFD simulations can be performed with a model ordinarily used for rocket motor studies.
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