Author:
COLLINS B. D.,JACOBS J. W.
Abstract
Investigations of the Richtmyer–Meshkov instability carried out in shock tubes have
traditionally used membranes to separate the two gases. The use of membranes, in
addition to introducing other experimental difficulties, impedes the use of advanced
visualization techniques such as planar laser-induced fluorescence (PLIF). Jones &
Jacobs (1997) recently developed a new technique by which a perturbed, membrane-free
gas–gas interface can be created in a shock tube. The gases enter the shock
tube from opposite ends and exit through two small slots on opposite sides of
the test section, forming a stagnation point flow at the interface location. A gentle
rocking motion of the shock tube then provides the initial perturbation in the form
of a standing wave. The original investigation using this technique utilized dense
fog seeding for visualization, which allowed large-scale effects to be observed, but
was incapable of resolving smaller-scale features. PLIF visualization is used in the
present study to investigate the instability generated by two incident shock strengths
(Ms = 1.11 and 1.21), yielding very clear digital images of the flow. Early-time
growth rate measurements obtained from these experiments are found to be in excellent
agreement with incompressible linear stability theory (appropriately adjusted for a
diffuse interface). Very good agreement is also found between the late-time amplitude
measurements and the nonlinear models of Zhang & Sohn (1997) and Sadot et al.
(1998). Comparison of images from the Ms = 1.11 and 1.21 sequences reveals a
significant increase in the amount of turbulent mixing in the higher-Mach-number
experiments, suggesting that a mixing transition has occurred.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
151 articles.
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