THE EFFECTS OF AMBIENT DISSOCIATION ON FROZEN HYPERSONIC STAGNATION FLOW.
CORNELL AERONAUTICAL LAB INC BUFFALO N Y
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The effects of ambient dissociation on frozen flow in the vicinity of a stagnation point are discussed within the framework of the thin shock-layer theory of Cheng. It is shown that if the convective heat transfer for an undissociated gas at a particular Reynolds number is known, then the total heat transfer for a frozen dissociated gas can be found for arbi trary values of wall catalycity. In particular, since indeed the undissociated gas solution is known, the results allow a rapid evaluation of the effects of Reynolds number, wall temperature, and catalytic efficiency on the recombination heat transfer. The general effects of ambient dissociation at low Reynolds numbers are discussed, and special consideration is given to the variation of the density-viscosity product and the Schmidt number with local atom mass fraction. For conditions where such variations are unimportant, the effects of ambient dissociation on a variety of flow quantities are calculated. The discussion includes an estimate of the extent of gas-phase reaction at low Reynolds numbers. Author