Studies in premixed combustion. Annual progress report, November 1, 1992--October 31, 1993

Technical Report · Mon Mar 01 04:00:00 EST 1993

DOI:https://doi.org/10.2172/10127198· OSTI ID:10127198

Sivashinsky, G I

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.

• Research Organization: City Coll. of New York, NY (United States). Levich Inst.
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-88ER13822
• OSTI ID: 10127198
• Report Number(s): DOE/ER/13822--6; ON: DE93007955
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800
BURNERS
COMBUSTION
COMBUSTION, PYROLYSIS, AND HIGH-TEMPERATURE CHEMISTRY
FLAME PROPAGATION
FLAMES
LAMINAR FLOW
MATHEMATICAL MODELS
PROGRESS REPORT
RESEARCH PROGRAMS