On the disturbance energy budget for gaseous H2 -Air detonations*

This study analyzes the wave energetics of gaseous detonations from the standpoint of disturbance energy production and propagation. Contribution of the three canonical forms of disturbances, namely, acoustic vortical and entropic sources are analyzed using data from a stoichiometric 2D Hydrogen air DNS study.  Particular attention is paid to the Rayleigh source term, i.e., the product of pressure and heat release terms, which serves as an acoustic source term. Unstable detonative mixtures of hydrogen-air have been compared with the stable H2-O2-Ar mixture from the standpoint of Rayleigh source magnitude. Finally, we compare the magnitude of these source terms relative to the energy flux of the transverse propagating waves.