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International Journal of Energetic Materials and Chemical Propulsion

ISSN Print: 2150-766X
ISSN Online: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v4.i1-6.950
pages 1026-1034

ANOMALOUS GROUP COMBUSTION THEORY: TRANSIENT DUALITY IN GROUP COMBUSTION

Huei-Huang Chiu
Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan,70101, ROC
C. L. Lin
Aerospace Science and Technology Research Center; Institute of Aeronautics and Astronautics, National Cheng Kung University Tainan, Taiwan
T. S. Li
Aerospace Science and Technology Research Center; Institute of Aeronautics and Astronautics, National Cheng Kung University Tainan, Taiwan

ABSTRACT

Polydisperse octane fuel droplet clusters preheating, igniting, and combusting in a hot environment are simulated to the probability of anomalous group combustion in premixed clusters in the broad ranges of initial group combustion number and cluster stoichiometry. Numerical analysis employs updated droplet laws accounting for the effects of relative motion and drop-drop interaction. The results reveal that the establishment of a single flame generally suffers flame bifurcation by which the inner flame propagates into the cluster interior and the other branch propagates into the exterior of the cluster. The appearance of external flame in low-G clusters and the inward propagation of the premixed flame into the cluster for intermediate to high-G clusters are perceived to be a possible mechanism of the anomaly observed in the recent experimental observation. Numerical analysis reveals pronounced anomalous group combustion occurring in a broad range of initial group combustion numbers when the cluster initial equivalence ratio is 0.5 to 50 for a cluster with a 1cm radius.