Abstract
Suitability of d32 (the Sauter mean diameter) and d20 (the surface-area mean diameter) for representing the ignition and combustor behavior of polydisperse sprays is examined. Initial size distributions considered are the Nukiyama-Tanasawa distribution and a bidisperse spray. Two physical situations are analyzed. In the first, the ignition characteristics of a polydisperse spray in the vicinity of a hot wall are studied. In the second, the flame propagation through a mixture of air and polydisperse spray in a constant-volume combustor is investigated. For both situations, the relevant two-phase equations are solved by a hybrid Eulerian-Lagrangian numerical method. The results indicate that the ignition behavior of polydisperse sprays is best represented by the surface-area mean diameter, whereas the flame propagation characteristics are best correlated by the Sauter mean diameter. These correlations are observed over a wide range of initial droplet size, size distribution, fuel volatility, and overall equivalence ratio, which is typical in practical combustion systems. 13 references.
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