Abstract
Recent analytical work by Bray indicates that single element, chemically reacting systems, e.g., H_2 ⇋ 2H, may suddenly freeze their composition at some point in a high speed nozzle and then remain at fixed composition throughout the remainder of the expansion. This sudden freezing or quenching phenomenon was also apparent in some theoretical calculations reported by Hall et al. and has been verified experimentally by Wegener. It is the purpose of this note to show qualitatively how Bray's sudden-freezing criterion is related to engine size by the scale factor for geometrically similar engines having n on equilibrium nozzle flows and in which a propellant system is used for which Bray's analysis is valid.
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