Abstract
Ignition characteristics of gelled hypergolic propellants have been investigated through the use of an impinging jet apparatus. Monomethylhydrazine, gelled with both hydroxypropylcellulose and fumed silica, was tested with red fuming nitric acid, gelled with two versions of fumed silica. Rheological measurements were made prior to injection. Inspection of high speed video results showed that the type of gelling agent used has a major impact on the ignition and combustion of gelled hypergolic propellants. Hydroxypropylcellulose fuel gels impinged onto fumed silica oxidizer gels did not result in ignition due to poor mixing between the propellant jets. Fumed silica gels with mismatched rheological properties also resulted in long ignition delays. Fumed silica gels with proper rheological properties resulted in repeatable ignition delays similar to those observed with neat propellants.
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