A theoretical model was proposed to simulate the combustion process in a pyrotechnic airbag inflator. It was based on mass, energy conservation equations, ideal gas equation of state, geometry combustion law of propellant and flowrate law of small gas vent. Heat transfer between the gas and the walls of the combustion chamber and the filter was also considered. Internal pressure curves and tank pressure curves were obtained. Numerical simulation results were compared with experiments to ensure the accuracy of the model.Results show that higher burning rate causes shorter time to reach the maximum pressure and higher maximum pressure. Thinner gas generator results in higher rising rate of pressure, shorter time reaching the maximum pressure and higher maximum pressure. The lager gas generator charge mass results it reaches the maximum pressure more quickly and higher maximum pressure while the larger nozzle area results in the maximum pressure more slowly and lower maximum pressure. It can provide references to design and research of the pyrotechnic airbag inflators.
LIU Wei①②;CHEN Fan①②;SHI Juntao①②;YAO Jun①②;QU Chun①②;ZHANG Ning①②.
Numerical Simulation and Experimental Study on the Combustion Process for a Pyrotechnic Airbag Inflator. Explosive Materials. 2017, 46(1): 24-24 https://doi.org/10.3969/j.issn.1001-8352.2017.01.005