Diagnostics For Multiple-phase Blast Flows
Author(s)
R. G. Ames, M. J. Murphy, S. E. Groves & D. Cunard
Abstract
Multiple-phase blast (MPB) flows are a class of multi-phase flows where there is
a strong, unsteady shock interacting with a non-gas-phase material. These flows
are most often produced by introducing a solid-phase particulate (usually a metal
powder) into a standard high explosive formulation. The presence of the
particulate dramatically alters the momentum and energy transport properties of
the blast field and produces substantial difficulty in producing measurements of
those phenomena. Standard, gas-phase-only measurements (e.g. pressure
gauges) capture only a portion of the momentum and energy transport associated
with the MPB flowfield. For this reason, novel diagnostic techniques have been
developed to aid in the characterization of a family of MPB explosive
formulations. A brief overview of three techniques is included in this paper: the
Unconfined Momentum Trap (UMT), the Inverted Ballistic Pendulum (IBP), and
the Confined Momentum Trap (CMT). The relevant theory behind each of these
techniques is discussed along with likely measurement uncertainties.
Keywords: multiphase flow, multiphase blast, blast diagnostics, particle-laden
flows, dusty flow.
1 Introduction
Multiphase flows are a general class of flows that have application in a number
of areas, including dispersal of pollutants, turbomachinery, rocket engines,
sprays and droplets, and, as presented here, in the blast fields produced by
particle-laden explosives. The general class of multiphase flows has been
studied theoretically under the construct of an equivalent continuum model
(e.g. [1–2]). Using this approach the dispersed non-gas-phase particulate is
treated as a continuous phase with an equivalent density, sound speed, and
Keywords
multiphase flow, multiphase blast, blast diagnostics, particle-laden
flows, dusty flow.
Related Book
Other papers in this volume
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