Combustion and inflation processes of pyrotechnic airbag inflators are simulated by a theoretical model and numerical code developed in this study. The theoretical model considers the ignition and combustion of gas-generation propellants located in the inflator. The filtering and heat-transfer processes of the filter, the mass and energy influxes from the igniter to the combustion chamber, and the leakage of combustion product gases through the exit of the discharge tank are also considered in the model. The model is based on the transient conservation equations of mass, species, and energy for the combustion chamber and the discharge tank. In addition, the model includes the propellant burning-rate law, the ignition model of gas-generation propellants, real-gas equation of state, heat-transfer correlations and filter clogging processes. The theoretical model is solved by a numerical code and verified by an analytical asymptotic solution of a closed system. Simulation results indicate that the pressure-time history in the combustion chamber is affected significantly by the igniter strength and ignition processes of gas-generation propellants.
Combustion and inflation process of pyrotechnic airbag inflators
Verbrennungs- und Aufblasvorgänge pyrotechnischer Gasgeneratoren
1996
17 Seiten, 10 Bilder, 13 Quellen
Conference paper
English
Combustion and inflation processes of pyrotechnic airbag inflators
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