Chemi-Acoustic Instability Structure in Irreversibly Reacting Systems.

摘要

A basic understanding of the structure of the interactions between chemical and acoustic instabilities and the effects derived therefrom is sought for a medium undergoing one-step irreversible chemical reaction. Detailed examination of the acoustic-chemical system after the completion of the reaction shows the distinct presence of the chemical, acoustic, and mixed modes of instability. The chemical mode appears as a stationary yet spatially inhomogeneous entropy distribution even though the medium initially (before reaction) is homogeneous throughout. The acoustic mode appears as a composite of both right- and left-travelling pressure or velocity waves, even though the initial acoustic wave is only right-travelling. The mixed modes of density and temperature fluctuations apparently retain to some degree the characteristics of both the acoustic and the chemical modes and may, under certain conditions, be dominated by either one of the modes of behavior.