A Methodology For Momentum Flux
Measurements In Two-phase Blast Flows
Author(s)
R. G. Ames & M. J. Murphy
Abstract
Modern diagnostics for air blast waves have been developed to the point that
they are sufficiently accurate and robust to capture most blast phenomena of
interest (most often pressure). Two-phase blast flows also transport momentum
and energy in a non-gas phase and, as such, the properties of this second phase
must be accounted for in estimating flowfield parameters. Standard air blast
diagnostics are not sufficient to capture these effects and the diagnostics that do
exist for multiphase flows normally rely on steady conditions or sampling
periods of at least a few milliseconds. The extreme transients associated with
multiphase blast flows (microsecond-scale) preclude the use of such techniques.
For this reason, novel approaches are required in order to capture the total
momentum and energy flux in two-phase blast flows. This paper outlines a
novel suite of diagnostics and an analysis technique that allows for momentum
flux measurements in two-phase blast flows.
Keywords: multiphase blast, two-phase blast, diagnostics, momentum flux,
impulse.
1 Introduction
The problem of separate momentum flux measurements in two-phase blast flows
is difficult because of the difference in length scales over which the two phases
interact with measurement devices. When trying to measure a reflected pressure
using a standard pressure gauge, the gas-phase loads are relatively constant over
the sensor surface area. As such, the average load is very close to the local loads
across the sensing surface. For a solid-phase particle blast, the local gradients
are very large due to particle impacts against the sensing surface. The average
load across the sensing surface is much lower, however, because the particles
Keywords
multiphase blast, two-phase blast, diagnostics, momentum flux,
impulse.
Related Book
Other papers in this volume
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