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An Analysis of Nonequilibrium Inviscid Flow

Report Number: AEDC TDR 62-172
Author: Gibson, W. E.
Author: Sowydra, A.
Corporate Author: Cornell Aeronautical, Inc.
Laboratory: Arnold Engineering Development Center
Date of Publication: 1962-08
Pages: 73
Contract: AF 40(600)-928
Project: 8951
Task: 89103
AD Number: AD0282901

An analytic solution is developed for blunt-body flows involving nonequilibrium chemistry. The chemical model describes a diatomic gas with a single dissociation recombination reaction. The progress of the reaction is determined behind the bow shock under conditions of vibrational equilibrium. The analysis seeks an improved understanding of the structure of the chemical relaxation zone along streamlines, in particular, its dependence on flow parameters. In high-altitude flight, three-body recombination becomes ineffective and dissociation or binary scaling can be applied. The range of validity of binary scaling is found and the implications for hypersonic testing are discussed. The analytic approach also applies for cases where recombination is important, including equilibrium flow. Numerical examples are given for spherical bodies and for a range of body sizes and flight altitudes.

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