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NASA, AL, USA

MULTIPHYSICS SOFTWARE
MODELS MEAN FLOW-AUGMENTED
ACOUSTICS IN ROCKET SYSTEMS

Combustion instability in solid rocket motors and liquid engines is a complication that continues to
challenge designers and engineers. The adoption of a higher-fidelity modeling approach supported by
multiphysics analysis provides greater insight and predictive ability.

by SEAN R. FISCHBACH

Many rocket systems experience violent uctuations in              The injector faceplate of the F1 engine
            pressure, velocity, and temperature originating from  that powered the Saturn V rocket.
            the complex interactions between the combustion
 process and gas dynamics. During severe cases of combustion
 instability, uctuation amplitudes can reach values equal
 to or greater than the average chamber pressure. Large
 amplitude oscillations lead to damaged injectors, loss of
 rocket performance, damaged payloads, and, in some cases,
 breach of case or loss of mission.

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