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

Technical Report · Fri Jan 01 00:00:00 EST 1993

DOI:https://doi.org/10.2172/6888830· OSTI ID:6888830

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; USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-88ER13822
• OSTI ID: 6888830
• 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
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