Oscillations in Flowing and Heated Subcritical Hydrogen
This experiment extends the range of earlier work[1–3] to pressures as low as 30 psia. Earlier work was for pressures above 110 psia. In the previous experiments, the oscillations were characterized as Helmholtz modes and the harmonics of a resonant pipe open at both ends. In this work, the downstream plenum which was basic to the Heimholtz mode has been eliminated, Nevertheless, a threshold phenomenon quite similar to that previously developed [2,3] was found to exist, and a meaningful interpretation in terms of Zuber’s  recent density variation theory has been developed, The work of Zuber is based upon the combustion instability theory of Crocco and Cheng  and the more recent developments of Wallis and Heasley  and Bouré . The derivation of Zuber closely parallels the definitive work of Crocco and Cheng and is extended to consider the supercritical state, The mechanism of oscillation is in terms of density variation, with “lags” in time and space related to the transition from a heavy fluid to a light fluid and is not dissimilar to the treatment of Bouré, Zuber also presents threshold criteria for two limiting conditions, small and large subcooling. The former is used in this work.
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