Abstract
Analogy between wedge-induced steady oblique detonation and one-dimensional unsteady piston-supported detonation is investigated based on a series of simulation results. The simulations are carried out by one and two-dimensional Euler Equations. Four types of wave structure of the wedge-induced oblique detonation appear in the simulation results. Those structures are basically the same as those of the piston-supported detonation, except for the type having the triple point on the oblique detonation wave. The reactant mass fraction history on the piston surface agrees well with that on the wedge wall in all types. A series of simulations of the one-dimensional piston-supported detonations varying activation energy, heat release, and piston speed are carried out in an attempt to understand a dominant parameter determining of the wave structure. We focus on reaction intensity as the dominant parameter. The reaction intensity, which is newly proposed as the ratio of the induction to total reaction time, represents the characteristic of the wave structure of the detonation. The reactant mass fraction history on the piston surface of the piston-supported unsteady detonation gives the induction and total reaction time. The reaction intensity of the piston-supported detonation classifies the wave structures in one-dimensional piston-supported detonation, and agrees well with that of the wedge-induced detonation.
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