Effects Of Droplet Preferential Segregation In
Turbulent Flows On The Mixture Fraction Topology
Author(s)
J. R´eveillon & F. X. Demoulin
Abstract
The objective of this paper is to determine the simultaneous effects of the turbulence
on the dispersion of an evaporating spray and the mixture fraction evolution.
Three-dimensional simulations are carried out following two stages leading to various
physical analysis. First, the mixing between the initially randomly dispersed
phase is considered with non-evaporating particles. Following their Stokes number
and the turbulence properties, the formation of clusters of particles is analyzed
(formation delay, cluster characteristic size). Once the particles are in dynamical
equilibrium with the surrounding turbulent flow, evaporation phenomena are considered
through the analysis of the mixture fraction evolution.
1 Introduction
In industrial systems dedicated to transport or energy transformation, a combustion
chamber is generally fuelled by a spray of evaporating liquid droplets. The
modeling of such chambers, involving the combustion of a two-phase flow or of
a gaseous mixture issued from evaporation of a spray, is of primary importance
to improve, the output of the considered device and to predict pollutant formation
while maintaining a reasonable development cost.
One of the input parameter of any non-premixed turbulent combustion model
is the mixture fraction variable Z, which describes locally the mixing between
the evaporated fuel and the gaseous oxidizer. The objective of this paper is to
determine the simultaneous effects of the turbulence on the spray dispersion and
the mixture fraction evolution. Thus, main characteristics of the mixture fraction
field (fluctuation intensity levels and characteristic length scales) can be estimated
directly from local properties of turbulence (rms, length scales) and spray parameters
(Stokes number, liquid equivalence ratio).
Keywords
Related Book
Other papers in this volume
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