BURNING MECHANISM OF HIGHLY PLASTICIZED NITROCELLULOSE SYSTEM WITH AMMONIUM NITRATE

摘要

In this paper burning mechanism of low calorific double-base propellant type highly plasticized nitrocellulose system (plasticizernitrocellulose ～1,8) with and without ammonium nitrate is studied in pressure range 2-8 MPa by the aid of micro thermocouples (5-7 microns thickness). Diethyleneglycol dinitrate, 2,4 - dinitro toluene and dibutyl phthalate in the ratio of 1:0,36:0,16 are used as plasticizer. The low calorific and highly plasticized system is especially chosen so as to get the propellant system with large amount of ammonium nitrate, which in turn will play the leading role in burning process. It is established, that even the experimental burning surface temperature of system without ammonium nitrate between the studied pressure range lower than the boiling temperature of plasticizers, the majority of heat necessary for propagation of burning wave is obtained from the condensed reaction zone. In the case of propellant system with 70% ammonium nitrate the unusual wide condense reaction zone is observed, for which two possible variants are proposed.