TED-AJ03-653 A Study of Scalar Structure and Soot Formation in a Heptane/Air Diffusion Flame
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概要
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One-dimensional opposed-flow heptane/air diffusion flame structure and soot formation were studied numerically by using a detailed gas phase chemical mechanism in conjunction with global soot kinetics. The radiation properties of the gas molecules and the soot particles were considered, including a treatment for the self-absorption. The Sandia OPPDIF (Opposed-Flow Diffusion Flame) code was modified to include Lindstedt's global soot kinetics and the radiation models. The interactions between the soot and the gas phase chemistry were considered. Two different chemical mechanisms were considered : Held's kinetics limited to hydrocarbons up to C_7H_16 and the University of Utah kinetics with PAH formation reactions up to the four aromatic rings PAH species pyrene. The results of the calculations using the two heptane mechanisms were compared with the experimental data for temperature and species distributions. The results of both mechanisms show reasonable agreement for major species and temperature. As expected, the University of Utah kinetics improves the predictions of higher hydrocarbon species concentrations. The heptane flames show much higher soot compared to the methane flames studied earlier. The soot volume fractions increase almost proportionally to the square of the pressure. The soot oxidation by OH radical dominates compared to the O_2 oxidation in relatively low pressures. The OH oxidation rate decreases with increasing pressure, and becomes unimportant compared to the O_2 oxidation and overall soot formation rate. The self-absorption of radiation has significant effects on soot volume fractions particularly at high pressures.
- 一般社団法人日本機械学会の論文
著者
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Takeno T.
Department Of Mechanical Engineering Meijo University
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Zhu X.
School of Mechanical Engineering, Purdue University
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Gore J.
School of Mechanical Engineering, Purdue University
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Gore J.
School Of Mechanical Engineering Purdue University