Abstract
In this paper the structure of strong transverse waves in two-dimensional numerical
simulations of cellular detonations is investigated. Resolution studies are performed
and it is shown that much higher resolutions than those generally used are required to
ensure that the flow and burning structures are well resolved. Resolutions of less than
about 20 numerical points in the characteristic reaction length of the underlying steady
detonation give very poor predictions of the shock configurations and burning, with
the solution quickly worsening as the resolution drops. It is very difficult and dangerous
to attempt to identify the physical structure, evolution and effect on the burning of
the transverse waves using such under-resolved calculations. The process of transverse
wave and triple point collision and reflection is then examined in a very high-resolution
simulation. During the reflection, the slip line and interior triple point associated with
the double Mach configuration of strong transverse waves become detached from the
front and recede from it, producing a pocket of unburnt gas. The interaction of a forward
facing jet of exploding gas with the emerging Mach stem produces a new double
Mach configuration. The formation of this new Mach configuration is very similar to
that of double Mach reflection of an inert shock wave reflecting from a wedge.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
134 articles.
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