In-Situ Burning Rate Determination Using Flash Radiography,
PURDUE UNIV LAFAYETTE IN
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Direct in-situ methods for determining burning rates and corresponding environments in solid rocket motors have been based on radiography and interrupted burning. The former has relatively poor accuracy because measurements are subjective the latter is relatively expensive - only one data set per motor firing is obtained. A new approach based on a combination of indirect and radiographic methods is proposed and carried through to preliminary results. The new method features direct measurement of port area mass burning rate is measured directly, multiple radiographs per burn, estimates for instantaneous burning rates, and improved accuracy achieved by eliminating subjective measurement and integrating film density data to attenuate random radiographic errors. Extraction of perimeter-circular ports to indirect-method accuracy. Examples of flash radiographs, traverse film density profiles, and propellant burning phenomena revealed by the radiographs are also presented.