Reaction zone structure for strong, weak overdriven, and weak underdriven oblique detonations

Abstract

A simple dynamic systems analysis is used to give examples of strong, weak overdriven, and weak underdriven oblique detonations. Steady oblique detonations consisting of a straight lead shock attached to a solid wedge followed by a resolved reaction zone structure are admitted as solutions to the reactive Euler equations. This is demonstrated for a fluid that is taken to be an inviscid, calorically perfect ideal gas that undergoes a two-step irreversible reaction with the first step exothermic and the second step endothermic. This model admits solutions for a continuum of shock wave angles for two classes of solutions identified by a Rankine–Hugoniot analysis: strong and weak overdriven waves. The other class, weak underdriven, is admitted for eigenvalue shock-wave angles. Chapman–Jouguet waves, however, are not admitted. These results contrast those for a corresponding one-step model that, for detonations with a straight lead shock, only admits strong, weak overdriven, and Chapman–Jouguet solutions.