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Title: Dynamics and structure of stretched flames

This program aims to gain fundamental understanding on the structure, geometry, and dynamics of laminar premixed flames, and relate these understanding to the practical issues of flame extinction and stabilization. The underlying fundamental interest here is the recent recognition that the response of premixed flames can be profoundly affected by flame stretch, as manifested by flow nonuniformity, flame curvature, and flame/flow unsteadiness. As such, many of the existing understanding on the behavior of premixed flames need to be qualitatively revised. The research program consists of three major thrusts: (1) detailed experimental and computational mapping of the structure of aerodynamically-strained planar flames, with emphasis on the effects of heat loss, nonequidiffusion, and finite residence time on the flame thickness, extent of incomplete reaction, and the state of extinction. (2) Analytical study of the geometry and dynamics of stretch-affected wrinkled flame sheets in simple configurations, as exemplified by the Bunsen flame and the spatially-periodic flame, with emphasis on the effects of nonlinear stretch, the phenomena of flame cusping, smoothing, and tip opening, and their implications on the structure and burning rate of turbulent flames. (3) Stabilization and blowoff of two-dimensional inverted premixed and stabilization and determining the criteria governing flame blowoff. Themore » research is synergistically conducted through the use of laser-based diagnostics, computational simulation of the flame structure with detailed chemistry and transport, and mathematical analysis of the flame dynamics.« less
Authors:
 [1]
  1. Princeton Univ., NJ (United States)
Publication Date:
OSTI Identifier:
139900
Report Number(s):
BNL--48923; CONF-9306172--
ON: DE93015758; TRN: 93:002191-0054
Resource Type:
Conference
Resource Relation:
Conference: 15. combustion research contractors` meeting, Lake Harmony, PA (United States), 2-4 Jun 1993; Other Information: PBD: 1993; Related Information: Is Part Of Fifteenth combustion research conference; PB: 391 p.
Research Org:
Brookhaven National Lab., Upton, NY (United States)
Country of Publication:
United States
Language:
English
Subject:
40 CHEMISTRY; FLAMES; DYNAMICS; COMBUSTION; LAMINAR FLOW; DIFFUSION; MATHEMATICAL MODELS; GEOMETRY; COMPUTERIZED SIMULATION