PYROLYSIS AND COMBUSTION OF LITHIUM ALUMINUM HYDRIDE
DENVER RESEARCH INST CO
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The slow pyrolysis of lithium aluminum hydride proceeds by a successive dehydrogenation of the fuel in three stages over a temperature range between 210 degrees and 460 degrees C. The combustion of lithium aluminum hydride follows a simular multistage process in which the pyrolytic dehydrogenation is followed by an afterburning of the metal substrate. Experimental studies were performed to determine the delay times between successive stages for solid mixtures of lithium aluminum hydride with selected oxidizers. Time resolved spectrographic techniques were used to determine the duration of these stages. Studies were performed using Li2O2 and NH4NO3 oxidizers over a particle size range between 75-300 microns and OF mixture ratios of between 0.5 and 3.0. Ignition delay times for the initial reaction were found to vary between 5 and 40 milliseconds for the first stage and 10 to 120 milliseconds for the second stages. An analytical model was developed to describe the observed multistage combustion process. The model and resulting PARTIG computer program utilize the nodal approach with stepwise solution of the equations for heat and mass transfer.
- Combustion and Ignition
- Solid Rocket Propellants