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Numerical Simulation of Flow of Pyrotechnic Igniter Gases Inside Inert Solid Rocket Motor
Abstract
A numerical model is developed to simulate the flow of gases produced due to pyrotechnic igniter inside an inert solid rocket motor chamber. Mass and energy generated by the combustion of pyrotechnic charge is released inside the free volume of igniter canister. The mass generation rate is calculated using pseudo-average-burn rate approach. The energy release rate is computed by obtaining the product of mass generated and calorific value of the charge. Commercially available CFD solver Fluent is utilized for modeling and a 3- dimensional, transient, compressible flow numerical model is developed. The k-ω turbulence model is used for turbulence modeling. The flow is computed for entire duration of the burning of charge and contours for variation of pressure, temperature and velocity inside the inert rocket motor are obtained. The model validation is carried by comparison of predicted and experimental pressure-time profile for Gunpowder composition and an excellent match is obtained.
DOI
10.12783/ballistics2019/33056
10.12783/ballistics2019/33056
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