EXPERIMENTAL INVESTIGATION OF HIGH-FREQUENCY LONGITUDINAL COMBUSTION INSTABILITY IN GASEOUS PROPELLANT ROCKET MOTORS
PRINCETON UNIV NJ DEPT OF AEROSPACE AND MECHANICAL SCIENCES
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The properties of the longitudinal mode of high-frequency combustion instability in a rocket motor burning premixed gaseous propellants were determined experimentally. The experimental observations were compared with the results of a non-linear instability theory based on a chemical kinetic driving mechanism. It was shown that the theory gives the correct waveform for longitudinal instability. In addition the theory gives the correct qualitative dependence of the stability limits on the mean combustion temperature and activation energy. Harmonic mode longitudinal instabilities were observed. The dependence of the stability limits and instability strength on the mean combustion pressure, combustion chamber length, injector and exhaust nozzle was determined experimentally. Based on the general agreement between the experimental observations and theoretical results it is concluded that the appropriate driving mechanism for high-frequency longitudinal gas-phase combustion instability is chemical kinetics.
- Physical Chemistry
- Combustion and Ignition
- Rocket Engines