Accession Number:

ADA422029

Title:

Physical and Chemical Processes in Flames

Descriptive Note:

Final technical rept. 1 Nov 2000-30 Oct 2003

Corporate Author:

PRINCETON UNIV NJ DEPT OF MECHANICAL AND AEROSPACE ENGINEERING

Personal Author(s):

Report Date:

2004-02-29

Pagination or Media Count:

16.0

Abstract:

The objective of the present program was to study the structure and response of laminar premixed and nonpremixed flames with emphases on effects of high pressure, flameflow unsteadiness, and chemistry. The investigations were conducted through laser-based experimentation, computational simulation with detailed chemistry and transport descriptions, and advanced mathematical analysis. Specific phenomena studied during the reporting period include the intrinsic pulsating instabilities of premixed and diffusion flames and the effects of stretch and radiation heat loss on the onset of pulsation and the associated extinction and flammability limits. laminar flame speed data were acquired for several fuel mixtures at atmospheric pressure and methaneair at elevated pressures. Directed relation graph theory and computational simulation were applied to develop automatic computational algorithms for the simplification of detailed mechanisms to skeletal mechanisms and of skeletal mechanisms to reduced mechanisms, respectively. These contributions are expected to be useful to the general interests of AFOSR in the fundamental and practical issues of flame dynamics and chemical kinetics, turbulent combustion, soot formation, radiation hear transfer, flame extinction, stabilization, flammability, and supersonic combustion.

Subject Categories:

  • Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE