< Serge77 - My Rocket Workshop >
Consequence of Accidental Ignition Experiment
Summary: the task is to melt 1 kg of KNO3-NaNO3-sorbitol 35-30-35 propellant, heat it to 180-190° C without stirring until complete dissolution of nitrates and ignite it in hot liquid state from the top surface.
KNO3:and NaNO3 reagent grade "pure for analysis". Moisture content 0.1-0.2%. They were milled together with coffee mill, crystals measured 50 microns to 300 microns.
Sorbitol: pharmaceutical grade. Moisture content 0.2-0.3%.
Experiment setup was the same as in the first test.
Two metal rods 1m height were placed at 1m distance from each other for the scale purposes.
1 kg batch of thoroughly mixed powdered KNO3-NaNO3-sorbitol propellant mixture was placed in aluminum pan. Small propane burner was used as heat source.
Melting process and ignition, frames from video
38 min - ignition of propellant drops from the propan burner.
Video of the ignition
Propellant temperature - unknown.
Ambient temperature +5° C.
Burn time ~0.4 s.
Fireball height is about 3-4 m.
Fireball width is about 2 m.