Quantitative experimental characterization of solidpropellant surface temperature before ignition for future model validation
Résumé
A general approach is presented in order to estimate the surface temperature and laser power density for solid-propellant ignition studies. It includes an error estimation based on random Monte Carlo draws. The method was demonstrated with a simple phenomenological ignition model adjusted to experimental data obtained with a research AP/HTPB composition. As a first step, only three error sources were considered here. The camera acquisition rate and synchronization are found to have a large impact on the estimated laser power density. A Gaussian laser beam profile was considered to illustrate biases for spatially integrated signals: the apparent ignition happens at the same time as the first local ignition spots, but with shallower temperature slopes. The approach is very promising for the purpose of reducing experimental error levels.
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