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国际能源材料和化学驱动期刊
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN 打印: 2150-766X
ISSN 在线: 2150-7678

国际能源材料和化学驱动期刊

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v8.i1.60
pages 71-80

ON THE TRANSITION FROM CLASSICAL DIFFUSION-LIMITED COMBUSTION BEHAVIOR FOR FINE AND ULTRAFINE ALUMINUM PARTICLES

Nick Glumac
University of Illinois-Urbana-Champaign Urbana, IL, USA
Herman Krier
University of Illinois, Urbana-Champaign, Urbana, IL 61801

ABSTRACT

The characteristics of aluminum particle combustion for fine particles burning below the diffusion limit are examined experimentally and theoretically. Many of the most common assumptions about aluminum combustion flame structure fail once the diffusion-limited structure begins to be lost, and new behavior is observed. Heterogeneous shock tube measurements at UIUC have been able to accurately characterize this behavior for micron and sub-micron particles. Among the observed changes are a reduced ignition temperature, a reduced peak combustion temperature, enhanced pressure dependence on the burning rate, a variation in the relative oxidizer efficiencies, and a change in the burning rate exponent. As particles approach the nanoscale, the behavior continues to change as particles approach the kinetic limit. Recent experimental results are reviewed, and a theoretical basis for these changes is proposed.


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