The paper presents the results of numerical studies of n-heptane spray combustion in an axisymmetric, constant-volume cylindrical chamber at high temperatures and pressures. In order to study auto-ignition, combustion and soot formation, a phenomenological model was used, integrated with the detailed kinetics of n-heptane. The HACA (hydrogen-abstraction-acetylene-addition) concept was involved in the mechanism accounting for the PAHs formation. Both PAHs and polyacetylenes were assumed to be the radical precursors of soot. This combustion chemistry was validated against the shock-tube ignition delay times of n-heptane and of acetylene, respectively. The acetylene oxidation is considered as the competing channel of soot formation. The validated combustion chemistry of reduced size (57 species and 212 reactions) was coupled with KIVA-3 code together with the sub-models for spray atomization, droplet collision and evaporation, and turbulent transport. To simulate the turbulence-chemistry interaction, a sub-grid PaSR (Partially Stirred Reactor) model developed at Chalmers was employed. The results of the n-heptane spray simulation show qualitatively a good agreement with the experimental measurements found in literature.
Numerical modeling of auto-ignition, combustion, and soot formation for n- heptane sprays in a high pressure constant-volume chamber
1999
Aufsatz (Konferenz)
Englisch
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