Internal ballistics of solid fuel ramjets
Boaz, Lowell David
Shreeve, Raymond R.
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An experimental investigation of the internal ballistics of solid fuel ramjets was conducted in order to determine the regression rate of the fuel as a function of chamber pressure, inlet air temperature, and air flux rate, and to model the flow in solid fuel ramjets which use sudden expansion flameholders at the inlet. In addition, flame stabilization limits were investigated. A computer solution for the non-reacting flow field gave results in good agreement with experiments. Solid fuel ramjets have an average regression rate of the fuel that closely follows the theoretical expression derived for kinetically controlled hybrid rocket combustion. The inlet step-height-to-motor-diameter ratio is the dominant parameter in determining flame stability limits. However, inlet velocity is also an important parameter.