Local fine flame structure and its influence on mixing processes in turbulent premixed flames

Journal Article · Mon Oct 01 04:00:00 EDT 1990 · Combustion and Flame; (USA)

DOI:https://doi.org/10.1016/0010-2180(90)90080-B· OSTI ID:6517269

Katsuki, M; Mizutani, Y; Yasuda, T; Kurosawa, Y; Kobayashi, K; Takahashi, T ^[1]

---

1. Dept. of Mechanical Engineering, Osaka Univ., Osaka 565 (JP)

Confined turbulent premixed flames stabilized by a pilot flame were investigated to elucidate the local fine structure of flames and its influence on mixing processes. The fine flame structure was classified on the basis of the measured turbulence characteristics, and the probability density functions (Pdfs) of local fluctuating velocity and temperature were examined in detail. A plateau like distribution in temperature pdf, which may correspond to a distributed reaction zone, was observed in a limited portion of the flame in addition to a typical bimodal distribution corresponding to the structure of a wrinkled laminar flame or laminar flamelets. Using an inert gas tracer, the authors examine the influence of the fine flame structure on the mixing processes and discuss the retardation of mixing by the flame.

• OSTI ID: 6517269
• Journal Information: Combustion and Flame; (USA), Journal Name: Combustion and Flame; (USA) Vol. 82:1; ISSN CBFMA; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
DENSITY
DISPERSIONS
FLAME PROPAGATION
FLAMES
FLUID FLOW
MIXTURES
MORPHOLOGY
PHYSICAL PROPERTIES
TEMPERATURE GRADIENTS
TURBULENT FLOW
VELOCITY