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Title: Studies in premixed combustion. [Benjamin Levich Inst. for Physico-Chemical Hydrodynamics, City College of CUNY, New York, New York]

During the period under review, significant progress was been made in studying the intrinsic dynamics of premixed flames and the problems of flame-flow interaction. (1) A weakly nonlinear model for Bunsen burner stabilized flames was proposed and employed for the simulation of three-dimensional polyhedral flames -- one of the most graphic manifestations of thermal-diffusive instability in premixed combustion. (2) A high-precision large-scale numerical simulation of Bunsen burner tip structure was conducted. The results obtained supported the earlier conjecture that the tip opening observed in low Lewis number systems is a purely optical effect not involving either flame extinction or leakage of unburned fuel. (3) A one-dimensional model describing a reaction wave moving through a unidirectional periodic flow field is proposed and studied numerically. For long-wavelength fields the system exhibits a peculiar non-uniqueness of possible propagation regimes. The transition from one regime to another occurs in a manner of hysteresis.
Authors:
Publication Date:
OSTI Identifier:
6888830
Report Number(s):
DOE/ER/13822-6
ON: DE93007955
DOE Contract Number:
FG02-88ER13822
Resource Type:
Technical Report
Research Org:
City Coll. of New York, NY (United States). Levich Inst.
Sponsoring Org:
DOE; USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; COMBUSTION; RESEARCH PROGRAMS; BURNERS; FLAME PROPAGATION; FLAMES; LAMINAR FLOW; MATHEMATICAL MODELS; PROGRESS REPORT; CHEMICAL REACTIONS; DOCUMENT TYPES; FLUID FLOW; OXIDATION; THERMOCHEMICAL PROCESSES 400800* -- Combustion, Pyrolysis, & High-Temperature Chemistry