Effect of Molecular Structure on Laminar Flame Speeds of Three C5 Alkenes

• Published in: Combustion science and technology Vol. 192; no. 4; pp. 728 - 743
• Main Authors: Zhong, Bei-Jing, Zeng, Zhao-Mei
• Format: Journal Article
• Language: English
• Published: New York Taylor & Francis 02.04.2020; Taylor & Francis Ltd
• Subjects: alkene; Alkenes; chemical kinetic model; Combustion; Combustion bombs; Flame speed; Flames; Fuels; High temperature; high temperature combustion; laminar flame speed; Molecular structure; Organic chemistry; Sensitivity analysis
• ISSN: 0010-2202; 1563-521X
• DOI: 10.1080/00102202.2019.1593156

The laminar flame speeds of 1-pentene and 2-methyl-2-butene are measured in our previous studies. In order to study the effect of molecular structure on the combustion characteristics of C 5 alkenes, the laminar flame speeds of 2-pentene/air mixtures were measured in a constant volume combustion bomb in the different conditions (T 0  = 450 K, p = 0.1/0.3 MPa, and φ = 0.6-1.6). Experimental results for the three fuels show that 1-pentene has the largest laminar flame speeds, and 2-methyl-2-butene has the lowest one. Further, a high-temperature chemical mechanism for C 5 alkenes was developed to analyze the differences in laminar flame speeds between the three fuels and to explore the effects of molecular structure on the combustion characteristics of the three C 5 alkenes. The chemical mechanism was verified by the experimental results of laminar flame speeds and can well predict the combustion characteristics of these three C 5 alkenes over a wide range of conditions. The effects of molecular structure on laminar flame speed were analyzed by the chemical kinetic model from three aspects: bond dissociation energies, reaction pathways, and sensitivity analyses. Results show that the chemical kinetic characteristics of linear 1-pentene and 2-pentene are similar to each other, while the chemical kinetic characteristics of branched 2-methyl-2-butene differ greatly from them.