Thin reaction zones in constant-density turbulent flows at low Damköhler numbers: Theory and simulations
Artikel i vetenskaplig tidskrift, 2019

Propagation of a single-reaction wave in a constant-density turbulent flow is studied by considering reaction rates that depend on the reaction
progress variable c in a highly nonlinear manner. Analysis of Direct Numerical Simulation (DNS) data obtained recently from 26 reaction
waves characterized by low Damköhler (0.01 < Da < 1) and high Karlovitz (6.5 < Ka < 587) numbers reveals the following trends. First, the
ratio of consumption velocity UT to rms turbulent velocity uœ' scales as square root of Da in line with Damköhler’s classical hypothesis. Second,
the ratio of fully developed turbulent wave thickness to an integral length scale of turbulence decreases with increasing Da and tends to scale
with inverse square root of Da, in line with the same hypothesis. Third, contrary to the widely accepted concept of distributed reaction zones,
reaction-zone broadening is quite moderate even at Da = 0.01 and Ka = 587. Fourth, contrary to the same concept, UT/u'œ is mainly controlled
by the reaction-surface area. Fifth, UT/uœ' does not vary with the laminar-reaction-zone thickness, provided that Da is constant. To explain the
totality of these DNS results, a new theory is developed by (i) exploring the propagation of a molecular mixing layer attached to an infinitely
thin reaction sheet in a highly turbulent flow and (ii) hypothesizing that the area of the reaction sheet is controlled by turbulent mixing. This
hypothesis is supported by order-of-magnitude estimates and results in the aforementioned Damköhler’s scaling for UT/u'œ. The theory is also
consistent with other aforementioned DNS results and, in particular, explains the weak influence of the laminar-reaction-zone thickness on
UT/u'œ.

flame thickness

premixed turbulent flames

turbulent reacting flows

DNS

combustion regime diagrams

turbulent burning velocity

CK-theory

Författare

Vladimir Sabelnikov

ONERA Centre de Palaiseau

Rixin Yu

Lunds universitet

Andrei Lipatnikov

Förbränning och sprejer

Physics of Fluids

1070-6631 (ISSN) 1089-7666 (eISSN)

Vol. 31 5 1-19 055104

Drivkrafter

Hållbar utveckling

Ämneskategorier

Teknisk mekanik

Annan fysik

Strömningsmekanik och akustik

Fundament

Grundläggande vetenskaper

DOI

10.1063/1.5090192

Mer information

Skapat

2019-05-10