Statistical OH-Zone Structures of Turbulent Jet Flames from Liftoff to Near-Blowout
作者:
TZONGH. CHEN,
LARRYP. GOSS,
期刊:
Combustion Science and Technology
(Taylor Available online 1991)
卷期:
Volume 79,
issue 4-6
页码: 311-324
ISSN:0010-2202
年代: 1991
DOI:10.1080/00102209108951772
出版商: Taylor & Francis Group
关键词: Flame;stabilization;measurement;OH;PLIF;probability
数据来源: Taylor
摘要:
Joint Reactive-Mie-Scattering (RMS) and Planar-Laser-Induced-Fluorescence (PLIF) techniques have been employed to study the impact of jet-shear-layer development upon flame behavior. Images of the complete penetration of the shear-layer vortex through the flame surface have been successfully captured utilizing these planar imaging techniques. Studies of these images have indicated that the degree of flame/flow interaction varies with respect to a wide range of flame conditions and results in the observation of several different types of flame zones—flamelets, multiple flamelets, thick flame zones, and local extinction. The probability of observing the different types of flame behavior was measured, and the results are presented. Analysis of the probability data indicates that the root-mean-square (rms) flame-surface fluctuation.L, provides a proper length for correlating the statistical behavior of the flame. Significant changes in the flame behavior were observed to occur at two critical values ofL—the minimal thermal thickness (∼ 1 mm) and the nozzle diameter (5 mm).
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