This volume discusses the various chemical reactions that occur and that could possibly occur in the RCS engines utilizing hydrazine-type fuel/nitrogen tetroxide propellant systems, prior to ignition (preignition), during combustion, and after combustion (postcombustion), and endeavors to relate the "hard-start" phenomenon to some of these reactions. The discussion is based on studies conducted by Bureau investigators and others utilizing a variety of experimental techniques and apparatus as well as current theories of chemical reactions and reaction kinetics. The chemical reactions were studied in low pressure gas flow reactors, low temperature homogeneous- and heterogeneous-phase reactors, simulated two-dimensional (2-D) engines, and scaled and full size engines. Nonchemical causes also have been suggested and considered for the hard-start phenomenon;they are dis¬cussed in other volumes of this report.
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