Flame propagation in bimodal nano/micro-sized aluminum particles/air mixtures

Ying Huang, Grant A. Risha, Vigor Yang, Richard A. Yetter

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

The combustion of bimodal aluminum particles with air is studied theoretically in a well-characterized laminar particle laden flow. The flames are assumed to consist of several different regimes, including preheat, flame, and post flame zones, for fuel-lean mixtures. The flame speed and temperature distribution are obtained by solving the energy equation in each regime and matching the temperature and heat flux at the interfacial boundaries. The analysis allows the investigation of the effects of particle size, particle composition, and equivalence ratio on the burning characteristics of aluminum-particle/air mixtures. Reasonable agreement between theoretical results and experimental data was obtained in terms of flame speed. For a mono-dispersed particle laden flow, the flame speed increases with increasing particle concentration under fuel-lean conditions, but with decreasing particle size. A companion numerical model, which treats very Fine aluminum particles as large molecules, is developed to obtain the flame speed at the molecular limit. For a bimodal particle laden flow, the flame structure may display either an overlapping or a separated configuration, depending on the combustion properties of aluminum particles at different scales. At low percentages of nano particles in the fuel formulation, the flame exhibits a separated spatial structure with a wider flame regime. At a higher loading of nano particles, an overlapping flame configuration is observed.

Original languageEnglish (US)
Title of host publicationCollection of Technical Papers - 44th AIAA Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
Pages14015-14025
Number of pages11
ISBN (Print)1563478072, 9781563478079
DOIs
StatePublished - 2006
Event44th AIAA Aerospace Sciences Meeting 2006 - Reno, NV, United States
Duration: Jan 9 2006Jan 12 2006

Publication series

NameCollection of Technical Papers - 44th AIAA Aerospace Sciences Meeting
Volume19

Other

Other44th AIAA Aerospace Sciences Meeting 2006
CountryUnited States
CityReno, NV
Period1/9/061/12/06

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Aerospace Engineering

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    Huang, Y., Risha, G. A., Yang, V., & Yetter, R. A. (2006). Flame propagation in bimodal nano/micro-sized aluminum particles/air mixtures. In Collection of Technical Papers - 44th AIAA Aerospace Sciences Meeting (pp. 14015-14025). (Collection of Technical Papers - 44th AIAA Aerospace Sciences Meeting; Vol. 19). American Institute of Aeronautics and Astronautics Inc.. https://doi.org/10.2514/6.2006-1155