Ignition and flame propagation in dilute polydisperse sprays - importance of d32 and d20
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.
- Research Organization:
- Illinois Univ., Chicago (USA)
- OSTI ID:
- 5248416
- Journal Information:
- J. Propul. Pow.; (United States), Vol. 4
- Country of Publication:
- United States
- Language:
- English
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