BASIC FEATURES OF THE SELF-IGNITION OF ATOMIZED LIQUID NITRO/ NITRATE/NITRITE COMPOUNDS IN A GASEOUS MEDIUM

摘要

Existing and new data of the self-ignition time delays of several atomized liquid nitroitratelnitrite hydrocarbons in air or oxygen in the submillisecond range were analyzed. Alkyl-NO, alkyl-NO_2, and alkyl-ONO_2 compounds were used as representative liquid fuels. Alkyl radicals were mostly C_nH_(2n+1) with n = 3 to 12. Shock-compressed air or oxygen was the gaseous oxidizer used. Experiments were performed using the reflected shock wave technique. Recordings of pressure and light emission were obtained. The heterogeneous mixtures of atomized nitro-ethers with air exhibited only mild self-ignition modes. The same type of atomized nitro-ethers + oxygen mixtures exhibited strong self-ignition modes. It was demonstrated that atomized alkyl nitrates had much shorter self-ignition time delays than atomized nitro-alkyls at temperature T < 1500 K and pressure P = 1 to 5 MPa. The dependence of self-ignition time delays on temperature was notably different for alkyl nitrates and nitro-alkyls. Additional experimental data on the phenomenon of self-ignition cessation at a certain limiting temperature were obtained for the ignition of atomized nitro-ethers. It was shown that in some studies the results observed may have been distorted owing to preliminary hydrolysis of alkyl nitrates (nitrites) during preparation and storage.