RESEARCH ON THE FIRE AND EXPLOSION HAZARDS ASSOCIATED WITH NEW LIQUID PROPELLANTS
BUREAU OF MINES PITTSBURGH PA
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The fuels studies included N2H4, MMH, and UDMH. Spontaneous ignition temperatures S.I.T. of liquid monomethyl hydrazine MMH, N2H4, and UDMH in various NO2 - air atmospheres were determined for several liquid fuel temperatures. Results showed that the S.I.T. for UDMH and N2H4 at any fixed concentration of NO2 decreased with increased fuel temperature. S.I.T. curves for liquid MMH at 36, 55 and 67C indicated a decreasing S.I.T. with decreasing liquid temperature. Detonation and flame propagation studies of a 20 UDMH-O mixture indicated a peak pressure in the experiment of about 330 psi propagation ion velocities are comparable to those obtained with ethylene-O mixtures. Minimum energy requirements under the same test conditions to produce ethylene-O and UDMH-O detonations are 11.5 and 10.5 joules, respectively. The mechanics of the central initiation-detonation test procedure are described.