Journal ArticleDOI
Influence of formation processes on oblique detonation wave stabilization
TLDR
In this article, the authors report steady, two-dimensional, inviscid solutions for the near field and far field of a supersonic reactive flow over a variable-double-ramp geometry.Abstract:
In this article we report steady, two-dimensional, inviscid solutions for the near field and far field of a supersonic reactive flow over a variable-double-ramp geometry/The incident shock wave compresses and heats the reactants that will combust after flowing some induction length* Upon reaction, a detonation wave forms and intersects the leading wave at some distance from the ramp surface. In this article, reaction-polar diagrams are developed and the detonation branch solutions are used to investigate the wave interaction processes that may lead to a steady three-wave structure. By considering this formation process new oblique detonation wave stabilization criteria based on the freestream conditions and ramp geometry are provided.read more
Citations
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Journal ArticleDOI
Structure of an oblique detonation wave induced by a wedge
TL;DR: In this paper, the structure of an oblique detonation wave induced by a wedge was investigated via numerical simulations and Rankine-Hugoniot analysis, and the two-dimensional Euler equations coupled with a two-step chemical reaction model were solved.
Journal ArticleDOI
Analytical and Numerical Investigations of Wedge-Induced Oblique Detonation Waves at Low Inflow Mach Number
TL;DR: In this paper, the authors investigated the wedge-induced oblique detonation wave (ODW) at low inflow Mach number via Rankine-Hugoniot analysis and numerical simulations.
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Ram accelerators : Outstanding issues and new directions
TL;DR: In this article, an assessment of the key issues affecting the thrust and maximum velocities that can be obtained in ram accelerators is presented, and a potential remedy to the unstart problem that involves modifying the geometry of the ram accelerator tube is presented.
Journal ArticleDOI
Formation and Structure of Steady Oblique and Conical Detonation Waves
TL;DR: In this paper, the formation and structure of oblique detonation waves initiated by semi-infinite wedges and cones are presented, and it is shown that, for such low wedge or cone angles, a planar oblique Chapman-Jouguet detonation is eventually initiated following an induction process.
References
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An analytical study of the hydrogen-air reaction mechanism with application to scramjet combustion
TL;DR: In this article, a chemical kinetic mechanism for the combustion of hydrogen has been assembled and optimized by comparing the observed behavior as determined in shock tube and flame studies with that predicted by the mechanism.
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Ram accelerator - A new chemical method for accelerating projectilesto ultrahigh velocities
TL;DR: The Ram Accelerator as discussed by the authors is based on gas-dynamic principles similar to those of an air-breathing ramjet but operates in a different manner, where the center body of a ramjet travels through a tube filled with a premixed gaseous fuel and oxidizer mixture, and the tube becomes the outer cowling of the ramjet.
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Detonation structures behind oblique shocks
TL;DR: In this paper, a multidimensional detonation structure consisting of the following elements: (1) a nonreactive, oblique shock, (2) an induction zone, (3) a set of deflagration waves, and (4) a reactive shock front is closely coupled with the energy release.
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Morphology of standing oblique detonation waves
TL;DR: In this article, a theoretical analysis is made of supersonic flow of a combustible gas mixture past a wedge or an inclined wall, which shows that, for approach velocities roughly 25% or more greater than the Chapman-Jouguet velocity of the reactant mixture, there exists a usefully wide range of turning angles within which ODWs may be attached or stabilized.