Abstract
Rocket propulsion systems are bound to energetic propellant combinations to provide the best performance in conjunction with smallest possible storage volume. The application of a gelled fuel and a gelled oxidizer potentially combines the advantages of conventional solid and liquid propellants without some specific disadvantages of both individual systems. Gelled JP-8 and RP-1 fuels have been used to study the rheological behavior of gelled hydrocarbons. For all investigations fumed silica was used as a gelling agentwith 4 to 7wt%.Alongside a description of the gel mixing process, the paper discusses viscosity, stability, thixotropic behavior, and the viscoelastic properties of the gels through their storage and loss moduli as a function of gelling-agent amount. An extended Herschel– Bulkley model was applied to describe the viscosity characteristics of the hydrocarbon gels. Differential scanning calorimetry measurements showed only a slight influence of the gelling-agent amount on the heat of vaporization of the gels. The ungelled hydrocarbons featured a higher heat of vaporization than the gels.
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