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Introduction to Reactive Gas Dynamics$
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Raymond Brun

Print publication date: 2009

Print ISBN-13: 9780199552689

Published to Oxford Scholarship Online: May 2009

DOI: 10.1093/acprof:oso/9780199552689.001.0001

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Reactive Flows

Reactive Flows

(p.259) Nine Reactive Flows
Introduction to Reactive Gas Dynamics

Raymond Brun

Oxford University Press

This chapter describes the chemical reactions occurring in high temperature gas flows from a macroscopic point of view. In equilibrium conditions, the law of mass action is established and examples are given, first for a single reaction (dissociation) and then for reactive gas mixtures. An application to the computation of flow quantities behind a shock wave in diatomic gases is presented. General formulas for reaction rate constants are given in non-equilibrium conditions. The vibrational relaxation is discussed and examples of TV and VV relaxation times are proposed. Typical non-equilibrium flows are examined in detail, such as flow behind a strong shock wave and expanding supersonic flow in a nozzle. Finally, an example of vibrational population evolution behind a straight shock wave is presented, as well as the air chemistry, including the ionisation processes.

Keywords:   chemical reactions, reaction rate constants, law of mass action, relaxation times, shock waves, supersonic nozzles, vibrational populations, ionisation

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